[AK5554]
AK5554
4-Channel Differential 32-bit ADC
1. General Description
The AK555x series is a 32-bit, 768 kHz sampling, differential input A/D converter for digital audio
systems. It achieves 115 dB dynamic range and 106 dB S/(N+D) while maintaining low power
consumption performance.
The AK5554 integrates a 4-channel A/D converter, suitable for mixers and multi-channel recorders. Four
types of digital filters are integrated and selectable according to the sound quality preference. The
AK5554 can be easily connected to a DSP by supporting TDM audio formats. Additionally, it supports
DSD output up to 11.2MHz. The channel summation mode improves the dynamic range performance by
summing-up multiple channel A/D data and averaging. The dynamic range is improved to 118 dB in
4-to-2 mode and to 121 dB in 4-to-1 mode.
2. Features
Sampling Rate: 8 kHz-768 kHz
Input: Full Differential Inputs
S/(N+D): 106 dB
DR: 115 dB (4-to-2 mode: 118 dB, 4-to-1 mode: 121 dB)
S/N: 115 dB (4-to-2 mode: 118 dB, 4-to-1 mode: 121 dB)
Internal Filter: Four types of LPF, Digital HPF
Power Supply: 4.5-5.5 V (Analog), 1.7-1.98 V or 3.0-3.6 V (Digital)
Output Format
PCM mode: 24/32-bit MSB justified, I2S or TDM
DSD mode: DSD Native 64, 128, 256
Maximized Slot Efficiency in TDM Mode by Optimal Data Placed Mode
Cascade TDM I/F:
TDM512: fs= 48 kHz
TDM256: fs= 96 kHz or 48 kHz
TDM126: fs= 192 kHz, 96 kHz or 48 kHz
Operation Mode: Master Mode & Slave Mode
Detection Function: Input Overflow Flag
Serial Interface: 3-wire Serial and I2C μP I/F (Pin setting is also available)
Power Consumption: 140 mW (@AVDD= 5.0 V, TVDD= 3.3 V, fs= 48 kHz)
Package: 48-pin QFN
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3. Table of Contents
General Description ............................................................................................................................ 1
Features .............................................................................................................................................. 1
Table of Contents................................................................................................................................ 2
Block Diagram..................................................................................................................................... 3
■ Block Diagram ..................................................................................................................................... 3
5. Pin Configurations and Functions ...................................................................................................... 4
■ Pin Configurations ............................................................................................................................... 4
■ Pin Functions ....................................................................................................................................... 5
■ Handling of Unused Pin ...................................................................................................................... 7
6. Absolute Maximum Ratings ................................................................................................................ 8
7. Recommended Operation Conditions ................................................................................................ 8
8. Analog Characteristics ........................................................................................................................ 9
9. Filter Characteristics ......................................................................................................................... 10
■ ADC Filter Characteristics (fs= 48 kHz) ............................................................................................ 10
■ ADC Filter Characteristics (fs= 96 kHz) ............................................................................................ 12
■ ADC Filter Characteristics (fs= 192 kHz) .......................................................................................... 14
■ ADC Filter Characteristics (fs= 384 kHz) .......................................................................................... 16
■ ADC Filter Characteristics (fs= 768 kHz) .......................................................................................... 17
10.
DC Characteristics ........................................................................................................................ 18
11.
Switching Characteristics .............................................................................................................. 19
■ Timing Diagram ................................................................................................................................. 26
12.
Functional Descriptions ................................................................................................................. 31
■ Digital Core Power Supply ................................................................................................................ 31
■ Output Mode ...................................................................................................................................... 31
■ Master Mode and Slave Mode .......................................................................................................... 31
■ System Clock .................................................................................................................................... 31
■ Audio Interface Format ...................................................................................................................... 34
■ Channel Summation (PCM mode, DSD mode) ................................................................................ 46
■ Optimal Data Placement Mode (PCM Mode, DSD Mode) ............................................................... 46
■ CH Power Down & Channel Summation (PCM mode, DSD mode) ................................................ 46
■ Data Slot Configuration ..................................................................................................................... 50
■ Digital Filter Setting (PCM mode) ..................................................................................................... 51
■ Digital HPF (PCM mode)................................................................................................................... 51
■ Overflow Detection (PCM mode, DSD mode) .................................................................................. 51
■ LDO ................................................................................................................................................... 52
■ Reset ................................................................................................................................................. 52
■ Power Down Function/ Sequence..................................................................................................... 53
■ Operation Mode Control .................................................................................................................... 56
■ Register Control Interface ................................................................................................................. 56
■ Register Map ..................................................................................................................................... 62
■ Register Definitions ........................................................................................................................... 62
13.
Recommended External Circuits .................................................................................................. 65
14.
Package......................................................................................................................................... 68
■ Outline Dimensions ........................................................................................................................... 68
■ Material & Lead Finish ...................................................................................................................... 68
■ Marking .............................................................................................................................................. 68
15.
Ordering Guide .............................................................................................................................. 69
16.
Revision History ............................................................................................................................ 69
IMPORTANT NOTICE ........................................................................................................................... 70
1.
2.
3.
4.
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4. Block Diagram
VREFL2
VREFH2
VREFL1
VREFH1
■ Block Diagram
TVDD
AIN1P
Delta-Sigma
Modulator
VDD18
DVSS
LDO
Voltage Reference
AIN1N
LDOE
Decimation
Filter
HPF
DIF0/DSDSEL0
DIF1/DSDSEL1
AIN2P
AIN2N
AIN3P
AIN3N
Delta-Sigma
Modulator
Decimation
Filter
Delta-Sigma
Modulator
HPF
BICK/DCLK
LRCK/DSDOL1
Decimation
Filter
Serial Output
Interface
HPF
TDMIN/DSDOR1
SDTO1/DSDOL2
SDTO2/DSDOR2
AIN4P
AIN4N
Delta-Sigma
Modulator
Decimation
Filter
HPF
DP
TDM0
TDM1
ODP
AVDD
AVSS
PS/CAD0_SPI
CKS0/SDA/CDTI
CKS1/CAD0_I2C/CSN
CKS2/SCL/CCLK
CKS3/CAD1
I2C
DCKS/HPFE
OVF
MSN
PW0
PW1
PW2
SD/PMOD
SLOW/DCKB
TEST
MCLK
PDN
Controller
Figure 1. Block Diagram
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5. Pin Configurations and Functions
36
35
34
33
32
31
30
29
28
27
26
25
SD/PMOD
SLOW/DCKB
CKS3/CAD1
CKS2/SCL/CCLK
CKS1/CAD0_I2C/CSN
CKS0/SDA/CDTI
OVF
SDTO2/DSDOR2
SDTO1/DSDOL2
TDMIN/DSDOR1
LRCK/DSDOL1
BICK/DCLK
■ Pin Configurations
37
38
39
40
41
42
43
44
45
46
47
48
48QFN
TOP VIEW
Exposed Pad (Back Face) *
24
23
22
21
20
19
18
17
16
15
14
13
MSN
PW2
PW1
PW0
PDN
VDD18
DVSS
TVDD
MCLK
TEST
AIN4P
AIN4N
NC
VREFL1
VREFH1
AIN2N
AIN2P
AVDD
AVSS
AIN3P
AIN3N
VREFH2
VREFL2
NC
1
2
3
4
5
6
7
8
9
10
11
12
DIF0/DSDSEL0
DIF1/DSDSEL1
TDM0
TDM1
PSN/CAD0_SPI
I2C
DP
HPFE/DCKS
LDOE
ODP
AIN1P
AIN1N
* The exposed pad at back face of the package must be open or connected to the ground.
Figure 2. Pin Configurations
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■ Pin Functions
No.
Pin Name
I/O
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
NC
VREFL1
VREFH1
AIN2N
AIN2P
AVDD
AVSS
AIN3P
AIN3N
VREFH2
VREFL2
NC
AIN4N
AIN4P
TEST
MCLK
I
I
I
I
I
I
I
I
I
I
I
I
17
TVDD
-
18
DVSS
I
No internal bonding. Connect to AVSS.
ADC Low Level Voltage Reference Input Pin
ADC High Level Voltage Reference Input Pin
Channel 2 Negative Input Pin
Channel 2 Positive Input Pin
Analog Power Supply Pin (AIN1-4), 4.5-5.5 V
Analog Ground Pin (AIN1-4)
Channel 3 Positive Input Pin
Channel 3 Negative Input Pin
ADC High Level Voltage Reference Input Pin
ADC Low Level Voltage Reference Input Pin
No internal bonding. Connect to AVSS.
Channel 4 Negative Input Pin
Channel 4 Positive Input Pin
TEST Enable Pin
Master Clock Input Pin
Digital I/O Buffers and LDO Power Supply Pin,
1.7-1.98 V (LDOE pin= “L”) or 3.0-3.6 V (LDOE pin= “H”).
Digital Ground Pin
Digital Core Power Supply Pin, 1.7-1.98V (LDOE pin= “L”)
19
VDD18
O
LDO Stabilization Capacitor Connect Pin. (LDOE pin= “H”)
20
PDN
I
21
22
23
24
PW0
PW1
PW2
MSN
I
I
I
I
I
BICK
25
O
DCLK
O
I
LRCK
26
O
DSDOL1
O
TDMIN
I
DSDOR1
O
SDTO1
DSDOL2
SDTO2
DSDOR2
OVF
O
O
O
O
O
27
28
29
30
Function
Reset & Power Down Pin
“L”: Reset & Power Down, “H” : Normal Operation
Power Management Pin, Channel Summation Select Pin1
Power Management Pin, Channel Summation Select Pin2
Power Management Pin, Channel Summation Select Pin3,
Master/Slave Select Pin
Audio Serial Data Clock Input Pin in PCM & Slave Mode
(This pin is pull down by 100 kΩ internally.)
Audio Serial Data Clock Output Pin in PCM & Master Mode
(This pin is pull down by 100 kΩ internally.)
DSD Clock Output Pin in DSD Mode
(This pin is pull down by 100 kΩ internally.)
Channel Clock Input Pin in PCM & Slave Mode
(This pin is pull down by 100 kΩ internally.)
Channel Clock Output Pin in PCM & Master Mode
(This pin is pull down by 100 kΩ internally.)
Audio Serial Data Output Pin for AIN1 in DSD Mode
(This pin is pull down by 100 kΩ internally.)
TDM Data Input Pin in PCM Mode
(This pin is pull down by 100 kΩ internally.)
Audio Serial Data Output Pin for AIN2 in DSD Mode
(This pin is pull down by 100 kΩ internally.)
Audio Serial Data Output Pin for AIN1 and AIN2 in PCM Mode
Audio Serial Data Output Pin for AIN3 in DSD Mode
Audio Serial Data Output Pin for AIN3 and AIN4 in PCM Mode
Audio Serial Data Output Pin for AIN4 in DSD Mode
Analog Input Over Flow Flag Output Pin
015099864-E-01
Power Down
Status
Hi-z & Pull
Down with
500 Ω
Hi-z
Hi-z
Hi-z
Hi-z
Hi-z
L
L
L
L
L
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[AK5554]
No.
31
32
33
34
35
36
Pin Name
I/O
Function
CKS0
SDA
CDTI
CKS1
CAD0_I2C
CSN
CKS2
SCL
CCLK
CKS3
CAD1
SLOW
DCKB
SD
PMOD
I
I/O
I
I
I
I
I
I
I
I
I
I
I
I
I
Clock Mode Select Pin
Control Data I/O Pin in I2C Bus Serial Control Mode
Control Data Input Pin in 3-wire Serial Control Mode
Clock Mode Select Pin
Chip Address 0 Pin in I2C Bus Serial Control Mode
Chip Select Pin in 3-wire Serial Control Mode
Clock Mode Select Pin
Control Data Clock Pin in I2C Bus Serial Control Mode
Control Data Clock Pin in 3-wire Serial Control Mode
Clock Mode Select Pin
Chip Address 1 Pin in I2C Bus or 3-wire Serial Control Mode
Slow Roll-OFF Digital Filter Select Pin in PCM Mode
Polarity of DCLK Pin in DSD Mode
Short Delay Digital Filer Select Pin in PCM Mode
DSD Phase Modulation Mode Select Pin in DSD Mode
Audio Data Format Select Pin in PCM Mode
“L”: MSB Justified, “H”: I2S
DSD Sampling Rate Control Pin in DSD Mode
Audio Data Format Select Pin in PCM Mode
“L”: 24-bit Mode, “H”: 32-bit Mode
DSD Sampling Rate Control Pin in DSD Mode
TDM I/F Format Select Pin
* This pin must be fixed to “L” when using DSD mode.
TDM I/F Format Select Pin
* This pin must be fixed to “L” when using DSD mode.
Control Mode Select Pin (I2C pin = “H”)
“L”:I2C Bus Serial Control Mode, “H” :Parallel Control Mode
Chip Address 0 Pin in 3-wire serial control Mode (I2C pin = “L”)
Control Mode Select Pin
“L”: 3-wire Serial Control Mode
“H”: I2C Bus Serial Control Mode or Parallel Control Mode
DSD Mode Enable Pin
“L”: PCM Mode, “H”: DSD Mode
High Pass Filter Enable Pin
“L”: HPF Disable, “H”: HPF Enable
Master Clock Frequency Select at DSD Mode (DSD Only)
LDO Enable Pin
“L”: LDO Disable, “H”: LDO Enable
DIF0
I
DSDSEL0
I
DIF1
I
DSDSEL1
I
39
TDM0
I
40
TDM1
I
PSN
I
CAD0_SPI
I
42
I2C
I
43
DP
I
37
38
41
44
45
HPFE
I
DCKS
I
LDOE
I
Power Down
Status
Hi-z
-
-
This pin is pulled down by 100 kΩ internally.
46
47
48
ODP
AIN1P
AIN1N
I
I
I
Optimal Data Placement Mode Enable Pin
Channel 1 Positive Input Pin
Channel 1 Negative Input Pin
-
Note 1. All digital input pins must not be allowed to float.
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■ Handling of Unused Pin
The unused I/O pins should be connected appropriately.
1. PCM Mode
Classification
Analog
Digital
2. DSD Mode
Classification
Analog
Digital
Pin Name
AIN1-4P, AIN1-4N
VREFH1-2
VREFL1-2, NC
TDMIN, TEST
SDTO1-2, OVF
Pin Name
AIN1-4P, AIN1-4N
VREFH1-2
VREFL1-2, NC
TDM0, TDM1, TEST
DSDDOL1-2, DSDDOR1-2, OVF
Setting
Open
Connect to AVDD
Connect to AVSS
Connect to DVSS
Open
Setting
Open
Connect to AVDD
Connect to AVSS
Connect to DVSS
Open
Note 2. Unused channels must be powered down.
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6. Absolute Maximum Ratings
(VSS= 0 V; Note 3)
Parameter
Symbol
Min.
Max.
Unit
Power
Analog (AVDD pin)
AVDDam
−0.3
6.0
V
Supplies:
Digital Interface (TVDD pin)
TVDDam
−0.3
4.0
V
Digital Core (VDD18 pin)(Note 4) VDD18am
−0.3
2.5
V
Input Current (Any Pin Except Supplies)
IIN
mA
10
Analog Input Voltage (AIN1-4P, AIN1-4N pins)
VINA
−0.3
AVDD+0.3
V
Digital Input Voltage
VIND
−0.3
TVDD+0.3
V
Ambient Temperature (Power applied)
When the back tab is connected to VSS
Ta
−40
105
C
When the back tab is open
Ta
−40
70
C
Storage Temperature
Tstg
−65
150
C
Note 3. All voltages with respect to ground.
Note 4. The 1.8 V LDO is off (LDOE pin = “L”) and an external power is supplied to the VDD18 pin.
WARNING: Operation at or beyond these limits may result in permanent damage to the device.
Normal operation is not guaranteed at these extremes.
7. Recommended Operation Conditions
(VSS=0V; Note 3)
Parameter
Analog (AVDD pin)
Power
Supplies
(LDOE pin= “L”) (Note 5)
Digital Interface (TVDD pin) (Note 6)
Digital Core (VDD18 pin)
(LDOE pin= “H”) (Note 7)
Digital Interface (TVDD pin)
Symbol
AVDD
Min.
4.5
Typ.
5.0
Max.
5.5
Unit
V
TVDD
VDD18
1.7
1.7
1.8
1.8
1.98
1.98
V
V
TVDD
3.0
3.3
3.6
V
Voltage
“H” voltage Reference (Note 8)
VREFH1-2
V
4.5
5.0
5.5
Reference
“L” voltage reference
VREFL1-2
AVSS
V
(Note 11)
Note 3. All voltages with respect to ground.
Note 5. VDD18 must be powered up either at the same time or after TVDD is powered up when the LDOE
pin = “L”. The power up sequence between AVDD pin and TVDD pin or between AVDD pin and
VDD18 pin is not critical.
Note 6. TVDD must not exceed VDD18±0.1 V when LDOE pin= “L”.
Note 7. When LDOE pin = “H”, the internal LDO supplies 1.8 V (typ). The power up sequences between
AVDD pin and TVDD pin is not critical.
Note 8. VREFH1-2 must not exceed AVDD+0.1 V.
Note 9. VREFL1-2 must be connected to AVSS.
Analog Input Voltage is proportional to {(VREFH) – (VREFL)}.
Vin (typ, @ 0dB) = 2.8 {(VREFH) – (VREFL)} / 5 [V].
* AKM assumes no responsibility for the usage beyond the conditions in this data sheet.
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8. Analog Characteristics
(Ta= 25 C; AVDD= 5.0 V; TVDD= 3.3 V, fs= 48 kHz, BICK= 64fs;
Signal Frequency= 1 kHz; 24-bit Data; Measurement frequency= 20 Hz-20 kHz at fs= 48 kHz,
40 Hz-40 kHz at fs= 96 kHz, 40 Hz-40 kHz at fs= 192 kHz, unless otherwise specified.)
Parameter
Min.
Typ.
Max.
Unit
Analog Input Characteristics:
Resolution
32
Bit
Input Voltage
(Note 10)
Vpp
2.7
2.8
2.9
106
−1 dBFS
100
dB
S/(N+D)
fs= 48 kHz
−20 dBFS
dB
92
BW=20 kHz
−60 dBFS
dB
52
106
−1 dBFS
dB
fs= 96 kHz
−20 dBFS
dB
89
BW= 40 kHz
−60 dBFS
dB
49
106
−1 dBFS
dB
fs= 192 kHz
−20 dBFS
dB
89
BW= 40 kHz
−60 dBFS
dB
49
Not Sum. mode
110
115
dB
Dynamic Range
4-to-2 mode
118
dB
(−60dBFS with A-weighted)
4-to-1 mode
121
dB
Not Sum. mode
110
115
dB
S/N
4-to-2 mode
118
dB
(A-weighted)
4-to-1 mode
121
dB
Input Resistance
These values will be doubled in DSD 64fs mode.
k
8.8
10.4
12.0
(Values in DSD128 or DSD256 modes are as shown here)
Interchannel Isolation
110
120
dB
(AIN1AIN2, AIN3AIN4)
Interchannel Gain Mismatch
0
0.5
dB
Power Supply Rejection
(Note 11)
60
dB
Power Supplies
Power Supply Current
Normal Operation (PDN pin = “H”, LDOE pin = “H”)
AVDD+VREFH1/2
22
29
mA
TVDD
(fs= 48 kHz)
9
12
mA
TVDD
(fs= 96 kHz)
16
21
mA
TVDD
(fs= 192 kHz)
15
20
mA
Power down mode (PDN pin = “L”)
(Note 12)
AVDD+TVDD
10
100
A
Note 10. This value is (AINnP)−(AINnN) that the ADC output becomes full-scale (n=1-4).
Vin = 0.56 (VREFHm−VREFLm) [Vpp]. (m=1-2)
Note 11. PSRR is applied to AVDD, TVDD with 1 kHz, 20 mVpp sine wave. The VREFH1-2 are held to
the fixed voltage.
Note 12. All digital inputs are fixed to TVDD or TVSS.
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9. Filter Characteristics
■ ADC Filter Characteristics (fs= 48 kHz)
(Ta= −40 - +105 C; AVDD= 4.5-5.5 V, TVDD=1.7-1.98 V (LDOE pin=“L”) or 3.0-3.6 V (LDOE pin=“H”),
VDD18= 1.7-1.98 V (LDOE pin= “L”))
Parameter
Symbol
Min.
Typ.
Max.
Unit
Digital Filter (Decimation LPF): SHARP ROLL-OFF (Figure 3)
(SD pin=“L”, SLOW pin=“L”)
Passband (Note 13)
+0.001/-0.06 dB
PB
0
kHz
22.0
kHz
24.4
−6.0 dB
Stopband (Note 13)
SB
27.9
kHz
Stopband Attenuation
SA
85
dB
Group Delay Distortion 0 - 20.0 kHz
0
1/fs
GD
Group Delay (Note 14)
GD
1/fs
19
Digital Filter (Decimation LPF): SLOW ROLL-OFF (Figure 4)
(SD pin=“L”, SLOW pin=“H”)
+0.001/-0.076 dB
Passband (Note 13)
PB
0
12.5
kHz
21.9
kHz
−6.0 dB
Stopband (Note 13)
SB
36.5
kHz
Stopband Attenuation
SA
85
dB
Group Delay Distortion 0 - 20.0kHz
0
1/fs
GD
Group Delay (Note 14)
GD
7
1/fs
Digital Filter (Decimation LPF): SHORT DELAY SHARP ROLL-OFF FILTER (Figure 5)
(SD pin=“H”, SLOW pin=”L”)
Passband (Note 13)
PB
0
22.0
kHz
+0.001/−0.06 dB
24.4
kHz
−6.0 dB
Stopband (Note 13)
SB
27.9
kHz
Stopband Attenuation
SA
85
dB
Group Delay Distortion 0 - 20.0 kHz
2.8
1/fs
GD
Group Delay (Note 14)
GD
1/fs
5
Digital Filter (Decimation LPF): SHORT DELAY SLOW ROLL-OFF (Figure 6)
(SD pin=“H”, SLOW pin=“H”)
+0.001/-0.076 dB
Passband (Note 13)
PB
0
12.5
kHz
21.9
kHz
−6.0 dB
Stopband (Note 13)
SB
36.5
kHz
Stopband Attenuation
SA
85
dB
Group Delay Distortion 0 - 20.0 kHz
1.2
1/fs
GD
Group Delay (Note 14)
GD
5
1/fs
Digital Filter (HPF):
−3.0 dB
Frequency Response
1.0
Hz
FR
2.5
Hz
−0.5 dB
(Note 13)
6.5
Hz
−0.1 dB
Note 13. The passband and stopband frequencies scale with fs.
For example, PB (+0.001 dB/−0.06 dB) = 0.46 fs (SHARP ROLL-OFF).
For example, PB (+0.001 dB/−0.076 dB) = 0.26 fs (SLOW ROLL-OFF).
Note 14. The calculated delay time induced by digital filtering. This time is from the input of an analog
signal to the L channel MSB output timing of the SDTO. It may have an error of +1[1/fs] at
maximum when outputting data via audio interfaces.
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Figure 3. SHARP ROLL-OFF (fs= 48 kHz)
Figure 4. SLOW ROLL-OFF (fs= 48 kHz)
Figure 5. SHORT DELAY SHARP ROLL-OFF (fs= 48 kHz)
Figure 6. SHORT DELAY SLOW ROLL-OFF (fs= 48 kHz)
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[AK5554]
■ ADC Filter Characteristics (fs= 96 kHz)
(Ta= −40 - +105 C; AVDD= 4.5-5.5 V, TVDD=1.7-1.98 V (LDOE pin=“L”) or 3.0-3.6 V (LDOE pin=“H”),
VDD18= 1.7-1.98 V (LDOE pin= “L”))
Parameter
Symbol
Min.
Typ.
Max.
Unit
Digital Filter (Decimation LPF): SHARP ROLL-OFF (Figure 7)
(SD pin=“L”, SLOW pin= “L”)
44.1
Passband (Note 13) +0.001/−0.06 dB
0
kHz
PB
48.8
kHz
−6.0 dB
Stopband (Note 13)
SB
55.7
kHz
Stopband Attenuation
SA
85
dB
Group Delay Distortion 0 - 40.0 kHz
0
1/fs
GD
Group Delay (Note 14)
GD
1/fs
19
Digital Filter (Decimation LPF): SLOW ROLL-OFF (Figure 8)
(SD pin=“L”, SLOW pin= “H”)
25
Passband (Note 13) +0.001/−0.076 dB
0
kHz
PB
43.8
kHz
−6.0 dB
Stopband (Note 13)
SB
73
kHz
Stopband Attenuation
SA
85
dB
Group Delay Distortion 0 - 40.0 kHz
0
1/fs
GD
Group Delay (Note 14)
GD
1/fs
7
Digital Filter (Decimation LPF): SHORT DELAY SHARP ROLL-OFF (Figure 9)
(SD pin=“H”, SLOW pin= “L”)
Passband (Note 13) +0.001/−0.06 dB
0
44.1
kHz
PB
48.8
kHz
−6.0 dB
Stopband (Note 13)
SB
55.7
kHz
Stopband Attenuation
SA
85
dB
Group Delay Distortion 0 - 40.0 kHz
2.8
1/fs
GD
Group Delay (Note 14)
GD
1/fs
5
Digital Filter (Decimation LPF): SHORT DELAY SLOW ROLL-OFF (Figure 10)
(SD pin=“H”, SLOW pin= “H”)
Passband (Note 13) +0.001/−0.076 dB
0
25
kHz
PB
43.8
kHz
−6.0 dB
Stopband (Note 13)
SB
73
kHz
Stopband Attenuation
SA
85
dB
Group Delay Distortion 0 - 40.0 kHz
1.2
1/fs
GD
Group Delay (Note 14)
GD
1/fs
5
Digital Filter (HPF):
−3.0 dB
Frequency Response
1.0
Hz
FR
2.5
Hz
−0.5 dB
(Note 13)
6.5
Hz
−0.1 dB
Note 13. The passband and stopband frequencies scale with fs.
For example, PB (+0.001 dB/−0.06 dB) = 0.46 fs (SHARP ROLL-OFF).
For example, PB (+0.001 dB/−0.076 dB) = 0.26 fs (SLOW ROLL-OFF).
Note 14. The calculated delay time induced by digital filtering. This time is from the input of an analog
signal to the L channel MSB output timing of the SDTO. It may have an error of +1[1/fs] at
maximum when outputting data via audio interfaces.
015099864-E-01
2020/07
- 12 -
[AK5554]
Figure 7. SHARP ROLL-OFF (fs= 96 kHz)
Figure 8. SLOW ROLL-OFF (fs= 96 kHz)
Figure 9. SHORT DELAY SHARP ROLL-OFF (fs= 96 kHz)
Figure 10. SHORT DELAY SLOW ROLL-OFF (fs= 96 kHz)
015099864-E-01
2020/07
- 13 -
[AK5554]
■ ADC Filter Characteristics (fs= 192 kHz)
(Ta= −40 - +105 C; AVDD= 4.5-5.5 V, TVDD=1.7-1.98 V (LDOE pin=“L”) or 3.0-3.6 V (LDOE pin=“H”),
VDD18= 1.7-1.98 V (LDOE pin= “L”))
Parameter
Symbol
Min.
Typ.
Max.
Unit
Digital Filter (Decimation LPF): SHARP ROLL-OFF (Figure 11)
(SD pin=“L”, SLOW pin=“L”)
83.7
Passband (Note 13) +0.001/−0.037 dB
0
kHz
PB
100.2
kHz
−6.0 dB
Stopband (Note 13)
SB
122.9
kHz
Stopband Attenuation
SA
85
dB
Group Delay Distortion 0 - 40.0 kHz
0
1/fs
GD
Group Delay (Note 14)
GD
1/fs
15
Digital Filter (Decimation LPF): SLOW ROLL-OFF (Figure 12)
(SD pin=“L”, SLOW pin=“H”)
Passband (Note 13) +0.001/−0.1 dB
0
31.5
kHz
PB
75.2
kHz
−6.0 dB
Stopband (Note 13)
SB
146
kHz
Stopband Attenuation
SA
85
dB
Group Delay Distortion 0 - 40.0 kHz
0
1/fs
GD
Group Delay (Note 14)
GD
8
1/fs
Digital Filter (Decimation LPF): SHORT DELAY SHARP ROLL-OFF FILTER (Figure 13)
(SD pin=“H”, SLOW pin=“L”)
Passband (Note 13) +0.001/−0.037 dB
0
83.7
kHz
PB
100.2
kHz
−6.0 dB
Stopband (Note 13)
SB
122.9
kHz
Stopband Attenuation
SA
85
dB
Group Delay Distortion 0 - 40.0 kHz
0.3
1/fs
GD
Group Delay (Note 14)
GD
1/fs
6
Digital Filter (Decimation LPF): SHORT DELAY SLOW ROLL-OFF FILTER (Figure 14)
(SD pin=“H”, SLOW pin=“H”)
Passband (Note 13) +0.001/−0.1 dB
0
31.5
kHz
PB
75.2
kHz
−6.0 dB
Stopband (Note 13)
SB
146
kHz
Stopband Attenuation
SA
85
dB
Group Delay Distortion 0 - 40.0 kHz
0.4
1/fs
GD
Group Delay (Note 14)
GD
6
1/fs
Digital Filter (HPF):
−3.0 dB
Frequency Response
1.0
Hz
FR
2.5
Hz
−0.5 dB
(Note 13)
6.5
Hz
−0.1 dB
Note 13. The passband and stopband frequencies scale with fs.
For example, PB (+0.001dB/−0.037dB) =0.436 fs (SHARP ROLL-OFF).
For example, PB (+0.001dB/−0.1dB) =0.164 fs (SLOW ROLL-OFF).
Note 14. The calculated delay time induced by digital filtering. This time is from the input of an analog
signal to the L channel MSB output timing of the SDTO. It may have an error of +1[1/fs] at
maximum when outputting data via audio interfaces.
015099864-E-01
2020/07
- 14 -
[AK5554]
Figure 11. SHARP ROLL-OFF (fs= 192 kHz)
Figure 12. SLOW ROLL-OFF (fs= 192 kHz)
Figure 13. SHORT DELAY SHARP ROLL-OFF (fs= 192 kHz)
Figure 14. SHORT DELAY SLOW ROLL-OFF (fs= 192 kHz)
015099864-E-01
2020/07
- 15 -
[AK5554]
■ ADC Filter Characteristics (fs= 384 kHz)
(Ta= −40 - +105 C; AVDD= 4.5-5.5 V, TVDD=1.7-1.98 V (LDOE pin=“L”) or 3.0-3.6 V (LDOE pin=“H”),
VDD18= 1.7-1.98 V (LDOE pin= “L”))
Parameter
Symbol
Min.
Typ.
Max.
Unit
Digital Filter (Decimation LPF) (Figure 15)
(SD pin=“X”, SLOW pin=“X”) * It does not depend on the SD pin and SLOW pin.
−0.1 dB
Frequency
81.75
kHz
Response
−1.0 dB
114
kHz
FR
(Note 13)
137.63
kHz
−3.0 dB
157.2
kHz
−6.0 dB
Stopband (Note 13)
SB
277.4
kHz
Stopband Attenuation
SA
85
dB
Group Delay Distortion 0 - 40.0 kHz
0
1/fs
GD
Group Delay (Note 14)
GD
1/fs
7
Note 13. The passband and stopband frequencies scale with fs.
Note 14. The calculated delay time induced by digital filtering. This time is from the input of an analog
signal to the L channel MSB output timing of the SDTO. It may have an error of +1[1/fs] at
maximum when outputting data via audio interfaces.
Figure 15. Frequency Response (fs = 384 kHz)
015099864-E-01
2020/07
- 16 -
[AK5554]
■ ADC Filter Characteristics (fs= 768 kHz)
(Ta= −40 - +105 C; AVDD= 4.5-5.5 V, TVDD=1.7-1.98 V (LDOE pin=“L”) or 3.0-3.6 V (LDOE pin=“H”),
VDD18= 1.7-1.98 V (LDOE pin= “L”))
Parameter
Symbol
Min.
Typ.
Max.
Unit
Digital Filter (Decimation LPF) (Figure 16)
(SD pin=“X”, SLOW pin=“X”) * It does not depend on the SD pin and SLOW pin.
−0.1 dB
Frequency Response
26.25
kHz
(Note 13)
−1.0 dB
83.75
kHz
FR
144.5
kHz
−3.0 dB
203.1
kHz
−6.0 dB
Stopband (Note 13)
SB
640.3
kHz
Stopband Attenuation
SA
85
dB
Group Delay Distortion 0 - 40.0 kHz
0
1/fs
GD
Group Delay (Note 14)
GD
1/fs
5
Note 13. The passband and stopband frequencies scale with fs.
Note 14. The calculated delay time induced by digital filtering. This time is from the input of an analog
signal to the L channel MSB output timing of the SDTO. It may have an error of +1[1/fs] at
maximum when outputting data via audio interfaces.
Figure 16. Frequency Response (fs = 768 kHz)
015099864-E-01
2020/07
- 17 -
[AK5554]
10. DC Characteristics
(Ta= −40-105 C; AVDD= 4.5-5.5 V, VDD18= 1.7-1.98 V (LDOE pin=“L”))
Parameter
Symbol
Min.
TVDD= 3.0-3.6 V (LDOE pin=”H”)
High-Level Input Voltage
Low-Level Input Voltage
High-Level Output Voltage
(Iout= −100 µA)
Low-Level Output Voltage
(except SDA pin: Iout= 100 µA)
(SDA pin: Iout= 3 mA)
TVDD= 1.7-1.98 V (LDOE pin=”L”)
(Note 15)
(Note 15)
(Note 16)
Typ.
Max.
Unit
VIH
VIL
70%TVDD
-
-
30%TVDD
V
V
VOH
TVDD−0.5
-
-
V
VOL
VOL
-
-
0.5
0.4
V
V
(Note 17)
High-Level Input Voltage
(Note 15)
VIH
80%TVDD
V
Low-Level Input Voltage
(Note 15)
VIL
20%TVDD
V
High-Level Output Voltage
(Note 16)
VOH
TVDD−0.3
V
(Iout= −100 µA)
Low-Level Output Voltage
(Note 17)
(except SDA pin: Iout= 100 µA)
VOL
0.3
V
(SDA pin: Iout= 3 mA)
VOL
20%TVDD
V
Input Leakage Current
Iin
10
A
Note 15. MCLK, PDN, PW0-2, MSN, BICK (Slave Mode), LRCK (Slave Mode), TDMIN, SLOW/DCKB,
SD/PMOD, CKS0/SDA (Write)/CDTI, CKS1/CAD0_I2C/CSN, CKS2/SCL/CCLK, CKS3/CAD1,
DIF0/DSDSEL0, DIF1/DSDSEL1, TDM0, TDM1, PSN/CAD0_SPI, I2C, DP, HPFE/DCKS,
LDOE, ODP, TEST
Note 16. BICK (Master Mode)/DCLK, LRCK (Master Mode)/DSDOL1, DSDOR1, SDTO1/DSDOL2,
SDTO2/DSDOR2, OVF
Note 17. Note.16 and SDA (Read)
The external pull-up resistors should be connected to TVDD+0.3 V or less.
015099864-E-01
2020/07
- 18 -
[AK5554]
11. Switching Characteristics
(Ta= −40 - +105 C; AVDD= 4.5-5.5 V, TVDD= 1.7-1.98 V (LDOE pin=“L”) or 3.0-3.6 V (LDOE pin=“H”),
VDD18= 1.7-1.98 V (LDOE pin=“L”), CL= 10 pF)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Master Clock Timing (Figure 18)
fCLK
2.048
49.152
MHz
Frequency
dCLK
45
55
%
Duty Cycle
LRCK Frequency (Slave mode) (Figure 17)
Normal mode (TDM1-0 bits = “00”)
fsn
8
54
kHz
Normal Speed mode
fsd
54
108
kHz
Double Speed mode
fsq
108
216
kHz
Quad Speed mode
fso
384
kHz
Oct Speed mode
fsh
768
kHz
Hex Speed mode
Duty
45
55
%
Duty Cycle
TDM128 mode (TDM1-0 bits = “01”)
fsn
8
54
kHz
Normal Speed mode
fsd
54
108
kHz
Double Speed mode
fsq
108
216
kHz
Quad Speed mode
tLRH
1/128fs
ns
High Time
tLRL
1/128fs
ns
Low Time
TDM256 mode (TDM1-0 bits = “10”)
fsn
8
54
kHz
Normal Speed mode
fsd
54
108
kHz
Double Speed mode
tLRH
1/256fs
ns
High time
tLRL
1/256fs
ns
Low time
TDM512 mode (TDM1-0 bits = “11”)
fsn
8
54
kHz
Normal Speed mode
tLRH
1/512fs
ns
High Time
tLRL
1/512fs
ns
Low Time
Parameter
LRCK Frequency (Master mode) (Figure 18)
Normal mode (TDM1-0 bits = “00”)
Normal Speed mode
Double Speed mode
Quad Speed mode
Oct Speed mode
Hex Speed mode
Duty Cycle
TDM128 mode (TDM1-0 bits = “01”)
Normal Speed mode
Double Speed mode
Quad Speed mode
High Time
TDM256 mode (TDM1-0 bits = “10”)
Normal Speed mode
Double Speed mode
High Time
TDM512 mode (TDM1-0 bits = “11”)
Normal Speed mode
High Time
Symbol
Min.
Typ.
Max.
Unit
fsn
fsd
fsq
fso
fsh
Duty
8
54
108
-
384
768
50
54
108
216
-
kHz
kHz
kHz
kHz
kHz
%
fsn
fsd
fsq
tLRH
8
54
108
-
1/4fs
54
108
216
-
kHz
kHz
kHz
ns
fsn
fsd
tLRH
8
54
-
1/8fs
54
108
-
kHz
kHz
ns
fsn
tLRH
8
-
1/16fs
54
-
kHz
ns
015099864-E-01
2020/07
- 19 -
[AK5554]
(Ta= −40 - +105 C; AVDD= 4.5-5.5 V, TVDD= 1.7-1.98 V (LDOE pin=“L”) or 3.0-3.6 V (LDOE pin=“H”),
VDD18= 1.7-1.98 V (LDOE pin=“L”), CL= 10 pF)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Audio Interface Timing (Slave mode)
Normal mode (TDM1-0 bits = “00”)
(8 kHz fs 216 kHz) (Figure 19)
(LDOE pin = “H”)
BICK Period
Normal Speed mode
Double Speed mode
Quad Speed mode
BICK Pulse Width Low
BICK Pulse Width High
LRCK Edge to BICK “↑”
(Note 19)
BICK “↑” to LRCK Edge
(Note 19)
LRCK to SDTO (MSB) (Except I2S Mode)
BICK “↓”toSDTO1/2
tBCK
tBCK
tBCK
tBCKL
tBCKH
tLRB
tBLR
tLRS
tBSD
1/128fsn
1/128fsd
1/64fsq
32
32
25
25
-
-
25
25
ns
ns
ns
ns
ns
ns
ns
ns
ns
Normal mode (TDM1-0 bits = “00”)
(8 kHz ≤ fs ≤ 216 kHz) (Figure 19)
(LDOE pin = “L”)
BICK Period
Normal Speed mode(8 kHz ≤ fs ≤ 48 kHz)
Double Speed mode(48 kHz ≤ fs ≤ 96 kHz)
Quad Speed mode(96 kHz ≤ fs ≤ 192 kHz)
BICK Pulse Width Low
BICK Pulse Width High
LRCK Edge to BICK “↑”
(Note 19)
BICK “↑” to LRCK Edge
(Note 19)
LRCK to SDTO (MSB) (Except I2S Mode)
BICK “↓” to SDTO1/2
tBCK
tBCK
tBCK
tBCKL
tBCKH
tLRB
tBLR
tLRS
tBSD
1/128fsn
1/128fsd
1/64fsq
36
36
30
30
-
-
30
30
ns
ns
ns
ns
ns
ns
ns
ns
ns
Normal mode (TDM1-0 bits = “00”)
(fs = 384 kHz, 768 kHz) (Figure 20)
BICK Period
Oct Speed mode
Hex Speed mode
BICK Pulse Width Low
BICK Pulse Width High
LRCK Edge to BICK “↑”
(Note 19)
BICK “↑” to LRCK Edge
(Note 19)
BICK “↑” to SDTO1/2
tBCK
tBCK
tBCKL
tBCKH
tLRB
tBLR
tBSDD
1/64fso
1/48fsh
12
12
12
12
5
-
22
ns
ns
ns
ns
ns
ns
ns
Note 18. When the 1024fs, 512fs or 768fs /256fs or 384fs /128fs or 192fs are switched, the AK5554
should be reset by the PDN pin or RSTN bit.
Note 19. BICK rising edge must not occur at the same time as LRCK edge.
015099864-E-01
2020/07
- 20 -
[AK5554]
(Ta= −40 - +105 C; AVDD= 4.5-5.5 V, TVDD= 1.7-1.98 V (LDOE pin=“L”) or 3.0-3.6 V (LDOE pin=“H”),
VDD18= 1.7-1.98 V (LDOE pin=“L”), CL= 10 pF)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Audio Interface Timing (Slave mode) (Figure 21)
TDM128 mode (TDM1-0 bits = “01”)
BICK Period
tBCK
1/128fsn
ns
Normal Speed mode
tBCK
1/128fsd
ns
Double Speed mode
tBCK
1/128fsq
ns
Quad Speed mode
tBCKL
14
ns
BICK Pulse Width Low
tBCKH
14
ns
BICK Pulse Width High
tLRB
14
ns
LRCK Edge to BICK “↑”
(Note 19)
tBLR
14
ns
BICK “↑” to LRCK Edge
(Note 19)
tBSDD
5
30
ns
BICK “↑” to SDTO1
tSDH
5
ns
TDMIN Hold Time
tSDS
5
ns
TDMIN Setup Time
TDM256 mode (TDM1-0 bits = “10”)
BICK Period
tBCK
1/256fsn
ns
Normal Speed mode
tBCK
1/256fsd
ns
Double Speed mode
tBCKL
14
ns
BICK Pulse Width Low
tBCKH
14
ns
BICK Pulse Width High
tLRB
14
ns
LRCK Edge to BICK “↑”
(Note 19)
tBLR
14
ns
BICK “↑” to LRCK Edge
(Note 19)
tBSDD
5
30
ns
BICK “↑” to SDTO1
tSDH
5
ns
TDMIN Hold Time
tSDS
5
ns
TDMIN Setup Time
TDM512 mode (TDM1-0 bits = “11”)
BICK Period
tBCK
1/512fsn
ns
Normal Speed mode
tBCKL
14
ns
BICK Pulse Width Low
tBCKH
14
ns
BICK Pulse Width High
tLRB
14
ns
LRCK Edge to BICK “↑”
(Note 19)
tBLR
14
ns
BICK “↑” to LRCK Edge
(Note 19)
tBSDD
5
30
ns
BICK “↑” to SDTO1
tSDH
5
ns
TDMIN Hold Time
tSDS
5
ns
TDMIN Setup Time
Note 18. When the 1024fs, 512fs or 768fs /256fs or 384fs /128fs or 192fs are switched, the AK5554
should be reset by the PDN pin or RSTN bit.
Note 19. BICK rising edge must not occur at the same time as LRCK edge.
015099864-E-01
2020/07
- 21 -
[AK5554]
(Ta= −40 - +105 C; AVDD= 4.5-5.5 V, TVDD= 1.7-1.98 V (LDOE pin=“L”) or 3.0-3.6 V (LDOE pin=“H”),
VDD18= 1.7-1.98 V (LDOE pin=“L”), CL= 10 pF)
Min.
Typ.
Max.
Parameter
Symbol
Unit
Audio Interface Timing (Master mode) (Figure 22)
Normal mode (TDM1-0 bits = “00”)
(8 kHz fs 216 kHz)
BICK Period
tBCK
1/64fsn
ns
Normal Speed mode
tBCK
1/64fsd
ns
Double Speed mode
tBCK
1/64fsq
ns
Quad Speed mode
dBCK
50
%
BICK Duty
tMBLR
−20
20
ns
BICK “↓” to LRCK Edge
tBSD
20
ns
BICK “↓”to SDTO1/2
−20
Normal mode (TDM1-0 bits = “00”)
(fs = 384 kHz, 768 kHz)
(LDOE pin = ”H”)
BICK Period
tBCK
1/64fso
ns
Oct speed mode
tBCK
1/64fsh
ns
Hex speed mode
dBCK
50
%
BICK Duty
tMBLR
−4
4
ns
BICK “↓” to LRCK Edge
tBSD
4
ns
BICK “↓” to SDTO1/2
−4
Normal mode (TDM1-0 bits = “00”)
(fs = 384 kHz,768 kHz)
(LDOE pin = ”L”)
BICK Period
tBCK
1/64fso
ns
Oct speed mode
tBCK
1/48fsh
ns
Hex speed mode
dBCK
50
%
BICK Duty
tMBLR
−5
5
ns
BICK “↓” to LRCK Edge
tBSD
5
ns
BICK “↓” to SDTO1/2
−5
Note 18. When the 1024fs, 512fs or 768fs /256fs or 384fs /128fs or 192fs are switched, the AK5554
should be reset by the PDN pin or RSTN bit.
015099864-E-01
2020/07
- 22 -
[AK5554]
(Ta= −40 - +105 C; AVDD= 4.5-5.5 V, TVDD= 1.7-1.98 V (LDOE pin=“L”) or 3.0-3.6 V (LDOE pin=“H”),
VDD18= 1.7-1.98 V (LDOE pin=“L”), CL= 10 pF)
Min.
Typ.
Max.
Parameter
Symbol
Unit
Audio Interface Timing (Master mode) (Figure 22)
TDM128 mode (TDM1-0 bits = “01”)
BICK Period
tBCK
1/128fsn
ns
Normal Speed mode
tBCK
1/128fsd
ns
Double Speed mode
tBCK
1/128fsq
ns
Quad Speed mode
dBCK
50
%
BICK Duty
tMBLR
−5
5
ns
BICK “↓” to LRCK Edge
tBSD
5
ns
BICK “↓” to SDTO1/2
−5
tSDH
ns
TDMIN Hold Time
5
tSDS
ns
TDMIN Setup Time
5
TDM256 mode (TDM1-0 bits = “10”)
BICK Period
tBCK
1/256fsn
ns
Normal Speed mode
tBCK
1/256fsd
ns
Double Speed mode
dBCK
50
%
BICK Duty
tMBLR
−5
5
ns
BICK “↓” to LRCK Edge
tBSD
5
ns
BICK “↓” to SDTO1
−5
tSDH
ns
TDMIN Hold Time
5
tSDS
ns
TDMIN Setup Time
5
TDM512 mode (TDM1-0 bits = “11”)
BICK Period
tBCK
1/512fsn
ns
Normal Speed mode
dBCK
50
%
BICK Duty
tMBLR
−5
5
ns
BICK “↓” to LRCK Edge
tBSD
5
ns
BICK “↓” to SDTO1
−5
tSDH
ns
TDMIN Hold Time
5
tSDS
ns
TDMIN Setup Time
5
Note 18. When the 1024fs, 512fs or 768fs /256fs or 384fs /128fs or 192fs are switched, the AK5554
should be reset by the PDN pin or RSTN bit.
015099864-E-01
2020/07
- 23 -
[AK5554]
(Ta= −40 - +105 C; AVDD= 4.5-5.5 V, TVDD= 1.7-1.98 V (LDOE pin=“L”) or 3.0-3.6 V (LDOE pin=“H”),
VDD18= 1.7-1.98 V (LDOE pin=“L”), CL= 10 pF)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Audio Interface Timing (Master mode) (Figure 23)
DSD Audio Interface Timing
(64fs mode, DSDSEL 1-0 bits = “00”)
tDCK
1/64fs
ns
DCLK Period
144
tDCKL
ns
DCLK Pulse Width Low
144
tDCKH
ns
DCLK Pulse Width High
tDDD
20
ns
DCLK Edge to DSDOL/R (Note 20)
−20
DSD Audio Interface Timing
(128fs mode, DSDSEL 1-0 bits = “01”)
tDCK
1/128fs
ns
DCLK Period
72
tDCKL
ns
DCLK Pulse Width Low
72
tDCKH
ns
DCLK Pulse Width High
tDDD
10
ns
DCLK Edge to DSDOL/R (Note 20)
−10
DSD Audio Interface Timing
(256fs mode, DSDSEL 1-0 bits = “10”)
tDCK
1/256fs
ns
DCLK Period
36
tDCKL
ns
DCLK Pulse Width Low
36
tDCKH
ns
DCLK Pulse Width High
tDDD
10
ns
DCLK Edge to DSDOL/R (Note 20)
−10
Note 18. When the 1024fs, 512fs or 768fs /256fs or 384fs /128fs or 192fs are switched, the AK5554
should be reset by the PDN pin or RSTN bit.
Note 20. tDDD is defined from a falling edge of DCLK “↓” to a DSDOL/R edge when DCKB bit = “0” and it
is defined from a rising edge of DCLK “↑” to a DSDOL/R edge when DCKB bit = “1”.
015099864-E-01
2020/07
- 24 -
[AK5554]
(Ta= −40 - +105 C; AVDD= 4.5-5.5 V, TVDD= 1.7-1.98 V (LDOE pin=“L”) or 3.0-3.6 V (LDOE pin=“H”),
VDD18= 1.7-1.98 V (LDOE pin=“L”), CL= 10 pF)
Parameter
Symbol
Min.
Typ.
Max. Unit
Control Interface Timing (3-Wire Serial mode):
(Figure 25) (Figure 26)
tCCK
200
ns
CCLK Period
tCCKL
80
ns
CCLK Pulse Width Low
tCCKH
80
ns
Pulse Width High
tCDS
40
ns
CDTI Setup Timing
tCDH
40
ns
CDTI Hold Timing
tCSW
150
ns
CSN “H” Time
tCSS
50
ns
CSN “↓” to CCLK “↑”
tCSH
50
ns
CCLK “↑” to CSN “↑”
Control Interface Timing (I2C Bus mode): (Figure 27)
fSCL
400
kHz
SCL CLOCK Frequency
tBUF
1.3
µs
Bus Free Time Between Transmissions
tHD
STA
0.6
µs
Start Condition Hold Tune (Prior to First Clock Pulse)
tLow
1.3
µs
Clock Low Time
tHIGH
0.6
µs
Clock High Time
tSU STA
0.6
µs
Setup Time for Repeated Start Condition
tHD DAT
0
µs
SDA Hold Time from SCL Falling (Note 21)
tSU DAT
0.1
µs
SDA Setup Time from SCL Rising
tR
1.0
µs
Rise Time of Both SDA and SCL Lines
tF
0.3
µs
Fall Time of Both SDA and SCL Lines
tSU STO
0.6
µs
Setup Time for Stop Condition
tSP
0
50
ns
Pulse Width of Spike Noise Suppressed by Input Filter
Cb
400
pF
Capacitive Load on Bus
Power Down & Reset Timing (Figure 28)
tPD
150
ns
PDN Pulse Width
(Note 22)
tRPD
30
ns
PDN Reject Pulse Width
(Note 22)
tPDV
583
1/fs
PDN “↑” to SDTO1-2 valid
(Note 23)
Note 21. Data must be held for sufficient time to bridge the 300 ns transition time of SCL.
Note 22. The AK5554 can be reset by setting the PDN pin to “L” upon power-up. The PDN pin must held
“L” for more than 150 ns for a certain reset. The AK5554 is not reset by the “L” pulse less than
30 ns.
Note 23. This cycle is the number of LRCK rising edges from the PDN pin = “H”.
015099864-E-01
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[AK5554]
■ Timing Diagram
[1] PCM mode
1/fCLK
50%TVDD
MCLK
tdCLKH
tdCLKL
dCLK=tdCLKHfs100
or
tdCLKLfs100
1/fs
50%TVDD
LRCK
tLRH
tLRL
tBCK
Duty=tLRHfs100
or
tLRLfs100
VIH
BICK
VIL
tBCKH
tBCKL
Figure 17. Clock Timing (Slave mode)
1/fCLK
50%TVDD
MCLK
tCLKH
tCLKL
dCLK=tCLKHfCLK100
or
tCLKLfCLK100
1/fs
VOH
50%TVDD
LRCK
Duty=tLRHfs100
tLRH
1/fBCK
50%TVDD
BICK
tBCKH
tBCKL
dBCK=tBCKHfBCK100
or
tBCKLfBCK100
Figure 18. Clock Timing (Master mode)
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- 26 -
[AK5554]
VIH
LRCK
VIL
tBLR
tLRB
VIH
BICK
VIL
tLRS
tBSD
SDTO1/2
50%TVDD
Figure 19. Audio Interface Timing (Normal mode & Slave mode: 8kHz ≤ fs ≤ 216kHz)
VIH
LRCK
VIL
tBLR
tLRB
VIH
BICK
VIL
tBSDD
SDTO1/2
50%TVDD
Figure 20. Audio Interface Timing (Normal & Slave mode: fs=384kHz, 768kHz)
VIH
LRCK
VIL
tBLR
tLRB
VIH
BICK
VIL
tBSDD
SDTO1/2
50%TVDD
tSDS
tSDH
VIH
TDMIN
VIL
Figure 21. Audio Interface Timing (TDM & Slave mode)
015099864-E-01
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[AK5554]
LRCK
50%TVDD
tMBLR
50%TVDD
BICK
tBSD
50%TVDD
SDTO1/2
tSDS
tSDH
VIH
TDMIN
VIL
Figure 22. Audio Interface Timing (Master mode)
[2] DSD mode
tDCK
tDCKL
tDCKH
VOH
DCLK
VOL
tDDD
VOH
DSDOL1-2
DSDOR1-2
VOL
Figure 23. Audio Serial Interface Timing (Normal mode, DCKB bit= “0” or DCKB pin= “L”)
tDCK
tDCKL
tDCKH
VOH
DCLK
VOL
tDDD
tDDD
VOH
DSDOL1-2
DSDOR1-2
VOL
Figure 24. Audio Serial Interface Timing (Phase Modulation mode, DCKB bit= “0” or DCKB pin= “L”)
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[AK5554]
[3] 3-Wire Serial Interface
VIH
CSN
VIL
tCSS
tCCKL tCCKH
VIH
CCLK
VIL
tCDS
CDTI
C1
tCDH
C0
R/W
VIH
A4
VIL
Figure 25. WRITE Command Input Timing (3-wire Serial mode)
tCSW
VIH
CSN
VIL
tCSH
VIH
CCLK
CDTI
VIL
D3
D2
D1
D0
VIH
VIL
Figure 26. WRITE Data Input Timing (3-wire Serial mode)
015099864-E-01
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[AK5554]
[4] I2C Interface
VIH
SDA
VIL
tLOW
tBUF
tR
tHIGH
tF
tSP
VIH
SCL
VIL
tHD:STA
Stop
tHD:DAT
Start
tSU:DAT
tSU:STA
tSU:STO
Start
Stop
Figure 27. I2C Bus mode Timing
[5] Power-down Timing
tPD
VIH
PDN
VIL
tPDV
SDTO1/2
tRP
D
50%TVDD
Figure 28. Power-down & Reset Timing
015099864-E-01
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[AK5554]
12. Functional Descriptions
■ Digital Core Power Supply
The digital core of the AK5554 is operates off of a 1.8 V power supply. Normally, this voltage is generated
by the internal LDO from TVDD (3.3 V) for digital interface. The internal LDO will be powered up by
setting the LDOE pin = “H”. Set the LDOE pin to “L” and supply a 1.8 V power to the VDD18 pin externally
when a 1.8 V is used as TVDD.
■ Output Mode
The AK5554 is able to output either PCM or DSD data. The DP pin or DP bit select the output mode. Set
the PW2 pin = PW1 pin = PW0 pin = “L” or RSTN bit = “0” or PW4-1 bits = “0H” to reset all channels when
changing the PCM/DSD mode. The AK5554 outputs data from the SDTO1-2 pins by BICK and LRCK in
PCM mode. DSD data are output from the DSDOL1-2 pins and DSDOR1-2 pins by DCLK in DSD mode.
DP pin
DP bit
Interface
L
0
PCM
H
1
DSD
Table 1. PCM/DSD Mode Control
■ Master Mode and Slave Mode
The AK5554 requires a master clock (MCLK), an audio serial data clock (BICK) and an output channel
clock (LRCK) in PCM mode. In this case, the LRCK frequency will be the sampling frequency.
Both master and slave modes are available in PCM mode. In master mode, the AK5554 internally
generates BICK and LRCK clocks from MCLK inputs and outputs them from the BICK pin and the LRCK
pin. MCLK must be synchronized with BICK and LRCK but the phase is not important. The MSN pin
controls master/slave mode. The AK5554 is in master mode when the MSN pin = “H” and in slave mode
when the MSN pin = “L”.
The AK5554 requires a master clock (MCLK) in DSD mode. Slave mode is not available in DSD mode,
only master mode is supported.
■ System Clock
[1] PCM Mode
The external system clocks, which are required to operate the AK5554, are MCLK, BICK and LRCK in
PCM mode. MCLK frequency is determined based on LRCK frequency, according to the operation mode.
Table 2, Table 3 and Table 4 show MCLK frequencies correspond to the normal audio rate. Set the
frequency ratio between Sampling frequency and MCLK by the CKS3-0 pins (Table 5).
All channels must be reset when changing the clock mode or audio interface format by the CKS2-0 pins
(bits), TDM1-0 pins (bits), DIF1-0 pins (bits) and the MSN pin. In parallel control mode, all channels will
be reset by the PDN pin = “L” or PW2-0 pins = “LLL”. In serial control mode, all channels will be reset by
RSTN bit = “0” or PW4-1 bits = “0H”. A stable clock must be supplied after releasing the reset.
The AK5554 integrates a phase detection circuit for LRCK. If the internal timing becomes out of
synchronization in slave mode, the AK5554 is reset automatically and the phase is resynchronized.
The following sequence must be executed when synchronizing multiple AK5554’s. Stop all AK5554’s in
reset status by setting the PDN pin = “L” → “H” after stopping the system clock. Make pin or register
settings while all channels are in reset status. After that, input the same system clock to all AK5554’s.
015099864-E-01
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[AK5554]
32fs
48fs
64fs
96fs
128fs
MCLK
192fs
32 kHz
N/A
N/A
N/A
N/A
N/A
N/A
48 kHz
N/A
N/A
N/A
N/A
N/A
N/A
96 kHz
N/A
N/A
N/A
N/A
N/A
N/A
192 kHz
N/A
N/A
N/A
N/A
24.576
MHz
384 kHz
N/A
N/A
24.576
MHz
36.864
MHz
768 kHz
24.576
MHz
36.864
MHz
N/A
N/A
fs
256fs
8.192
MHz
12.288
MHz
24.576
MHz
384fs
12.288
MHz
18.432
MHz
36.864
MHz
512fs
16.384
MHz
24.576
MHz
768fs
24.576
MHz
36.864
MHz
1024fs
32.768
MHz
N/A
N/A
N/A
36.864
MHz
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
(N/A: Not Available)
Table 2 System Clock Example (Slave mode)
32fs
48fs
64fs
96fs
128fs
MCLK
192fs
32 kHz
N/A
N/A
N/A
N/A
N/A
N/A
48 kHz
N/A
N/A
N/A
N/A
N/A
N/A
96 kHz
N/A
N/A
N/A
N/A
N/A
N/A
192 kHz
N/A
N/a
N/A
N/A
24.576
MHz
384 kHz
N/A
N/A
36.864
MHz
768 kHz
24.576
MHz
36.864
MHz
24.576
MHz
49.152
MHz
N/A
fs
256fs
8.192
MHz
12.288
MHz
24.576
MHz
384fs
12.288
MHz
18.432
MHz
36.864
MHz
512fs
16.384
MHz
24.576
MHz
768fs
24.576
MHz
36.864
MHz
1024fs
32.768
MHz
N/A
N/A
N/A
36.864
MHz
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
(N/A: Not available)
Table 3. System Clock Example (Master mode)
32fs
48fs
64fs
96fs
128fs
MCLK
192fs
256fs
384fs
32 kHz
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
48 kHz
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
96 kHz
N/A
N/A
N/A
N/A
N/A
N/A
24.576
MHz
192 kHz
N/A
N/a
N/A
N/A
24.576
MHz
36.864
MHz
384 kHz
N/A
N/A
24.576
MHz
36.864
MHz
N/A
768 kHz
24.576
MHz
36.864
MHz
N/A
N/A
N/A
fs
512fs
16.384
MHz
24.576
MHz
768fs
24.576
MHz
36.864
MHz
1024fs
32.768
MHz
36.864
MHz
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
(N/A: Not available)
Table 4. System Clock Example (Auto mode)
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[AK5554]
CKS3
pin(bit)
CKS2
pin(bit)
CKS1
pin(bit)
CKS0
pin(bit)
L(0)
L(0)
L(0)
L(0)
L(0)
L(0)
L(0)
H(1)
L(0)
L(0)
H(1)
L(0)
L(0)
L(0)
H(1)
H(1)
L(0)
H(1)
L(0)
L(0)
L(0)
H(1)
L(0)
H(1)
L(0)
H(1)
H(1)
L(0)
L(0)
H(1)
H(1)
H(1)
H(1)
L(0)
L(0)
L(0)
H(1)
L(0)
L(0)
H(1)
H(1)
L(0)
H(1)
L(0)
H(1)
L(0)
H(1)
H(1)
H(1)
H(1)
L(0)
L(0)
H(1)
H(1)
L(0)
H(1)
H(1)
H(1)
H(1)
L(0)
H(1)
H(1)
H(1)
H(1)
MSN pin
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
MCLK
Frequency
128fs
24M
192fs
36M
256fs
12M
256fs
24M
384fs
36M
384fs
18M
512fs
24M
768fs
36M
64fs
24M
32fs
24M
96fs
36M
48fs
36M
NA
64fs
49.1M
1024fs
32M
Speed Mode
fs Range
Quad Speed
108 kHz fs 216 kHz
Quad Speed
108 kHz fs 216 kHz
Normal Speed
8 kHz fs 54 kHz
Double Speed
54 kHz fs 108 kHz
Double Speed
54 kHz fs 108 kHz
Normal Speed
8 kHz fs 54 kHz
Normal Speed
8 kHz fs 54 kHz
Normal Speed
8 kHz fs 54 kHz
Oct Speed
fs = 384 kHz
Hex Speed
fs = 768 kHz
Oct Speed
fs = 384 kHz
Hex Speed
fs = 768 kHz
NA
Hex Speed
fs = 768 kHz
Normal Speed
8 kHz ≤ fs ≤ 32 kHz
NA
NA
L
Auto
H
NA
8 kHz fs 216kHz
fs = 384kHz, 768 kHz
NA
Table 5. Clock Mode (fs & MCLK Frequency)
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[AK5554]
[2] DSD Mode
The AK5554 only supports master mode in DSD mode. The external clock, which is required to operate
the AK5554, is MCLK in DSD mode. The AK5554 generates DCLK from MCLK inputs and DSD data
outputs (DSDOL1-2 and DSDOR1-2) are synchronized with DCLK.
The necessary MCLK frequencies are 512fs and 768fs (fs=32 kHz, 44.1 kHz, 48 kHz). MCLK frequency
can be changed by the DCKS pin (bit). After exiting reset (PDN pin = “L” → “H”) upon power-up, the
AK5554 is in power-down state until MCLK is input.
DCKS pin (bit)
MCLK Frequency
L(0)
512fs
H(1)
768fs
Table 6. System Clock (DSD mode)
(default)
The AK5554 supports 64fs, 128fs and 256fs DSD sampling frequencies (fs= 32 kHz 44.1 kHz, 48 kHz).
DSDSEL1-0 pins (bits) control this setting (Table 7).
DSDSEL1
pin (bit)
L(0)
L(0)
H(1)
H(1)
DSDSEL0
pin (bit)
L(0)
H(1)
L(0)
H(1)
Frequency
DSD Sampling Frequency
Mode
fs= 32 kHz
fs= 44.1 kHz
fs= 48 kHz
64fs
2.048 MHz
2.8224 MHz
3.072 MHz
128fs
4.096 MHz
5.6448 MHz
6.144 MHz
256fs
8.192 MHz
11.2896 MHz
12.288 MHz
Reserved
Reserved
Reserved
Table 7. DSD Sampling Frequency Select
(default)
■ Audio Interface Format
TDM1-0 pins(bits), DIF1-0 pins(bits), SLOW pin(bit) and SD pin(bit) settings should be changed when all
channels are reset condition.
[1] PCM Mode
48 types of audio interface format can be selected by the TDM1-0 pins (bits), MSN pin and DIF1-0 pins
(bits) (Table 8, Table 9). In all formats the serial data is MSB-first, 2's complement format. In master
mode, the SDTO1-2 is clocked out on the falling edge of BICK. Normal output in slave mode, the
SDTO1-2 is clocked out on the falling edge of BICK if 8 kHz ≤ fs ≤ 216 kHz. In other conditions, the data
is clocked out on the prior rising edge of BICK to compensate for some delay that renders the edge of
data transition near BICK falling edge.
Audio interface format is distinguished in four types: Normal mode, TDM128 mode, TDM256 mode and
TDM512 mode are available. The TDM1-0 pins (bits) select these modes.
In Normal mode (non TDM), AIN1 and AIN2 A/D converted data is output from the SDTO1 pin, AIN3 and
AIN4 A/D converted data is output from the SDTO2 pin.
The BICK frequency must be in the rage from 48fs to 128fs (fs= 48 kHz) in slave mode if the audio
interface format is in normal output (non TDM) and the interface speed is in Normal, Double or Quad
mode. Bit length of A/D data is 24-bit or 32-bit and it is selected by the DIF1 pin (bit).
The BICK frequency must be set to 32fs, 48fs or 64fs in slave mode if the audio interface format is normal
output (non TDM) and the interface speed is in OCT mode. Bit length of A/D data is determined by BICK
frequency regardless of the DIF1 pin (bit) if the BICK frequency is 32fs or 48fs. It is 16-bit when the BICK
frequency is 32fs and 24-bit when the BICK frequency is 48fs. When the BICK frequency is 64fs, A/D
data can be selected between 24-bit and 32-bit by the DIF1 pin (bit).
015099864-E-01
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[AK5554]
The BICK frequency must be set to 32fs or 48fs in slave mode if the audio interface format is normal
output (non TDM) and the interface speed is in HEX mode. The 64fs is not available. Bit length of A/D
data is determined by BICK frequency regardless of the DIF1 pin (bit). It is 16-bit when the BICK
frequency is 32fs and 24-bit when the BICK frequency is 48fs.
The BICK frequency will be 64fs in master mode if the audio interface format is normal output (non TDM)
and the interface speed is Normal, Double or Quad mode. Data bit length can be selected from 24-bit and
32-bit by the DIF1 pin (bit).
The MCLK frequency must be 64fs or 96fs in master mode if the audio interface format is normal output
(non TDM) and the interface speed is OCT mode. The BICK frequency will be 64fs. Data bit length can be
selected from 24-bit and 32-bit by the DIF1 pin (bit).
The BICK frequency will be synchronized with the MCLK frequency in master mode if the audio interface
format is normal output (non TDM) and the interface speed is HEX mode. The MCLK frequency must be
32fs, 48fs or 64fs. The bit length of A/D data is 16-bit when the MCLK frequency is 32fs, 24-bit when the
MCLK frequency is 48fs and 24-bit or 32-bit can be selected by the DIF1 pin (bit) when the MCLK
frequency is 64fs.
The DIF0 pin selects the A/D data format between MSB justified and I2S Compatible.
No.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
Multiplex Speed TDM1 TDM0
Mode
Mode pin(bit) pin(bit)
MSN
Pin
L
Normal
Double
Quad
L(0)
L(0)
H
L
Normal
OCT
HEX
L(0)
L(0)
H
DIF1
DIF0
SDTO
pin(bit) pin(bit)
L(0)
L(0)
24-bit, MSB
L(0)
H(1)
24-bit, I2S
H(1)
L(0)
32-bit, MSB
H(1)
H(1)
32-bit, I2S
L(0)
L(0)
24-bit, MSB
L(0)
H(1)
24-bit, I2S
H(1)
L(0)
32-bit, MSB
H(1)
H(1)
32-bit, I2S
*
L(0)
16-bit, MSB
*
H(1)
16-bit, I2S
*
L(0)
24-bit, MSB
*
H(1)
24-bit, I2S
L(0)
L(0)
24-bit, MSB
L(0)
H(1)
24-bit, I2S
H(1)
L(0)
32-bit, MSB
H(1)
H(1)
32-bit, I2S
*
L(0)
16-bit, MSB
*
H(1)
16-bit, I2S
*
L(0)
24-bit, MSB
*
H(1)
24-bit, I2S
L(0)
L(0)
24-bit, MSB
L(0)
H(1)
24-bit, I2S
H(1)
L(0)
32-bit, MSB
H(1)
H(1)
32-bit, I2S
LRCK
Pol. I/O
H/L I
L/H I
H/L I
L/H I
H/L O
L/H O
H/L O
L/H O
H/L ↑
L/H ↓
H/L ↑
L/H ↓
H/L ↑
L/H ↓
H/L ↑
L/H ↓
H/L ↑
L/H ↓
H/L ↑
L/H ↓
H/L ↑
L/H ↓
H/L ↑
L/H ↓
BICK
Freq.
48-128fs
48-128fs
64-128fs
64-128fs
64fs
64fs
64fs
64fs
32fs
32fs
48fs
48fs
64fs *
64fs *
64fs *
64fs *
32fs
32fs
48fs
48fs
64fs
64fs
64fs
64fs
I/O
I
I
I
I
O
O
O
O
I
I
I
I
I
I
I
I
O
O
O
O
O
O
O
O
MCLK
Freq.
I/O
128-1024fs I
128-1024fs I
128-1024fs I
128-1024fs I
128-1024fs I
128-1024fs I
128-1024fs I
128-1024fs I
32-96fs
I
32-96fs
I
32-96fs
I
32-96fs
I
32-96fs
I
32-96fs
I
32-96fs
I
32-96fs
I
32fs
I
32fs
I
48fs
I
48fs
I
64-96fs
I
64-96fs
I
64-96fs
I
64-96fs
I
*: OCT mode only.
Table 8. Audio Interface Format (Normal mode)
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[AK5554]
No.
Multiplex Speed TDM1 TDM0
Mode
Mode pin(bit) pin(bit)
24
25
26
Normal
27
TDM128 Double
28
Quad
29
30
31
32
33
34
35
Normal
TDM256
Double
36
37
38
39
40
41
42
43
TDM512 Normal
44
45
46
47
MSN
pin
L
L(0)
H(1)
H
L
H(1)
L(0)
H
L
H(1)
H(1)
H
DIF1
DIF0
pin(bit) pin(bit)
L(0)
L(0)
L(0)
H(1)
H(1)
L(0)
H(1)
H(1)
L(0)
L(0)
L(0)
H(1)
H(1)
L(0)
H(1)
H(1)
L(0)
L(0)
L(0)
H(1)
H(1)
L(0)
H(1)
H(1)
L(0)
L(0)
L(0)
H(1)
H(1)
L(0)
H(1)
H(1)
L(0)
L(0)
L(0)
H(1)
H(1)
L(0)
H(1)
H(1)
L(0)
L(0)
L(0)
H(1)
H(1)
L(0)
H(1)
H(1)
SDTO
24-bit, MSB
24-bit, I2S
32-bit, MSB
32-bit, I2S
24-bit, MSB
24-bit, I2S
32-bit, MSB
32-bit, I2S
24-bit, MSB
24-bit, I2S
32-bit, MSB
32-bit, I2S
24-bit, MSB
24-bit, I2S
32-bit, MSB
32-bit, I2S
24-bit, MSB
24-bit, I2S
32-bit, MSB
32-bit, I2S
24-bit, MSB
24-bit, I2S
32-bit, MSB
32-bit, I2S
LRCK
Edg. I/O
↑
I
↓
I
↑
I
↓
I
↑
O
↓
O
↑
O
↓
O
↑
I
↓
I
↑
I
↓
I
↑
O
↓
O
↑
O
↓
O
↑
I
↓
I
↑
I
↓
I
↑
O
↓
O
↑
O
↓
O
BICK
Freq. I/O
128fs
I
128fs
I
128fs
I
128fs
I
128fs
O
128fs
O
128fs
O
128fs
O
256fs
I
256fs
I
256fs
I
256fs
I
256fs
O
256fs
O
256fs
O
256fs
O
512fs
I
512fs
I
512fs
I
512fs
I
512fs
O
512fs
O
512fs
O
512fs
O
MCLK
Freq.
I/O
128-1024fs I
128-1024fs I
128-1024fs I
128-1024fs I
128-1024fs I
128-1024fs I
128-1024fs I
128-1024fs I
256-1024fs I
256-1024fs I
256-1024fs I
256-1024fs I
256-1024fs I
256-1024fs I
256-1024fs I
256-1024fs I
256-1024fs I
256-1024fs I
256-1024fs I
256-1024fs I
512-1024fs I
512-1024fs I
512-1024fs I
512-1024fs I
Table 9. Audio Interface Format (TDM mode)
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[AK5554]
Cascade Connection in TDM mode
The AK5554 supports cascade connection in TDM mode. All A/D converted data of connected AK5554
are output from the SDTO1 pin of the last AK5554 by cascade connection.
When the ODP pin = “L”, a cascade connection of one devices in TDM128 mode, two devices in TDM256
mode and four devices in TDM512 mode are supported. Figure 29 shows a connection example. When
the ODP pin = “H”, a cascade connection of two up to sixteen devices is available.
When using multiple devices in slave mode on cascade connection, internal operation timing of each
device may differ for one MCLK cycle depending on MCLK and BICK input timings. To prevent this timing
difference, BICK “↓” should be more than ± 10ns from MCLK “↑” as shown in Table 10. To realize this
timing, BICK divided by two should be input on a falling edge of MCLK as shown in Figure 54 when
MCLK=2xBICK (normal speed 1024fs mode). When MCLK=BICK (normal speed 512fs mode), MCLK
and BICK should be input in-phase as shown in Figure 55 to satisfy the timing shown in Table 10.
256fs, 512fs or 1024fs
48kHz
512fs
AK5554 #1
MCLK
TDMIN
LRCK
BICK
SDTO1
GND
Master mode
AK5554 #1
MCLK
48kHz
LRCK
256fs
BICK
AK5554 #2
TDMIN
MCLK
GND
SDTO1
TDMIN
LRCK
BICK
SDTO1
Slave mode
Slave mode
AK5554 #2
AK5554 #3
MCLK
TDMIN
LRCK
BICK
MCLK
8ch TDM
BICK
SDTO1
TDMIN
LRCK
SDTO1
Slave mode
Slave mode
TDM256
AK5554 #4
MCLK
TDMIN
LRCK
BICK
16ch TDM
SDTO1
Slave mode
TDM512
Figure 29. Cascade Connection
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[AK5554]
LRCK
0
1
2
11
12
13
23
24
31
0
1
2
11
12
13
23
24
31
0
1
BICK(64fs)
SDTO1/2
1
13 12 11
23 22
0
23 22
13
1
12 11
0
31
23: MSB, 0: LSB
AIN1/3 Data
AIN2/4 Data
Figure 30. Mode 0/4 Timing (Normal mode, Normal/Double/Quad Speed mode, MSB Justified, 24-bit)
LRCK
0
1
2
3
22
23
24
25
29
30
31
0
1
2
3
22
23
24
25
29
30
31
0
1
BICK(64fs)
SDTO1/2
23 22
2
1
0
23 22
2
1
0
23: MSB, 0: LSB
AIN1/3 Data
AIN2/4 Data
Figure 31. Mode 1/5 Timing (Normal mode, Normal/Double/Quad Speed mode, I2S Compatible, 24-bit)
LRCK
0
1
2
11
12
13
20
21
31
0
1
2
12
13
14
24
25
31
0
1
BICK(64fs)
SDTO1/2
12 11
22 20 19
31 30
1
0
31 30
22
12 11
20 19
1
0
31
31: MSB, 0: LSB
AIN1/3 Data
AIN2/4 Data
Figure 32. Mode 2/6 Timing (Normal mode, Normal/Double/Quad Speed mode, MSB Justified, 32-bit)
LRCK
0
1
2
3
23
24
25
26
29
30
31
0
1
2
3
23
24
25
26
29
30
31
0
1
BICK(64fs)
SDTO1/2
31 30
16 15 14
3
2
1
0
31 30
16 15 14
3
2
1
0
31: MSB, 0: LSB
AIN1/3 Data
AIN2/4 Data
Figure 33. Mode 3/7 Timing (Normal mode, Normal/Double/Quad Speed mode, I2S Compatible, 32-bit)
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[AK5554]
32 BICK
LRCK (Master)
LRCK (Slave)
BICK (32fs)
SDTO1-2 (O)
0 15 14
9
8
7
6
1
0 15 14
9
8
7
6
1
AIN1/3 Data
AIN2/4 Data
16 BICK
16 BICK
0 15 14
Figure 34. Mode 8/16 Timing (Normal mode, OCT/HEX Speed mode, MSB Justified, 16-bit)
32 BICK
LRCK (Master)
LRCK (Slave)
BICK (32fs)
SDTO1-2 (O)
0 15 14
9
8
7
6
1
0 15 14
9
8
7
6
1
AIN1/3/5 Data
AIN2/4/6 Data
16 BICK
16 BICK
0 15 14
Figure 35. Mode 9/17 Timing (Normal mode, OCT/HEX Speed mode, I2S Compatible, 16-bit)
48 BICK
LRCK (Master)
LRCK (Slave)
BICK (48fs)
SDTO1-2 (O)
0 23 22
13 12 11 10
1
0 23 22
13 12 11 10
AIN1/3 Data
AIN2/4 Data
24 BICK
24 BICK
1
0 23 22
Figure 36. Mode 10/18 Timing (Normal mode, OCT/HEX Speed mode, MSB Justified, 24-bit)
48 BICK
LRCK (Master)
LRCK (Slave)
BICK (48fs)
SDTO1-2 (O)
0 23 22
13 12 11 10
1
0 23 22
13 12 11 10
AIN1/3 Data
AIN2/4 Data
24 BICK
24 BICK
1
0 23 22
Figure 37. Mode 11/19 Timing (Normal mode, OCT/HEX Speed mode, I2S Compatible, 24-bit)
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[AK5554]
64 BICK
LRCK (Master)
LRCK (Slave)
BICK (64fs)
SDTO1-2 (O)
23 22
15
8
7
0
23 22
15
8
7
0
AIN1/3 Data
AIN2/4 Data
32 BICK
32 BICK
23 22
Figure 38. Mode 12/20 Timing (Normal mode, OCT/HEX Speed mode, MSB Justified, 24-bit)
64 BICK
LRCK (Master)
LRCK (Slave)
BICK (64fs)
SDTO1-2 (O)
23 22
15
8
7
0
23 22
15
8
7
0
AIN1/3 Data
AIN2/4 Data
32 BICK
32 BICK
23 22
Figure 39. Mode 13/21 Timing (Normal mode, OCT/HEX Speed mode, I2S Compatible, 24-bit)
64 BICK
LRCK (Master)
LRCK (Slave)
BICK (64fs)
SDTO1-2 (O)
0 31 30
17 16 15 14
1
0 31 30
17 16 15 14
AIN1/3 Data
AIN2/4 Data
32 BICK
32 BICK
1
0 31 30
Figure 40. Mode 14/22 Timing (Normal mode, OCT/HEX Speed mode, MSB Justified, 32-bit)
64 BICK
LRCK (Master)
LRCK (Slave)
BICK (64fs)
SDTO1-2 (O)
0 31 30
17 16 15 14
1
0 31 30
17 16 15 14
AIN1/3 Data
AIN2/4 Data
32 BICK
32 BICK
1
0 31 30
Figure 41. Mode 15/23 Timing (Normal mode, OCT/HEX Speed mode, I2S Compatible, 32-bit)
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[AK5554]
128 BICK
LRCK (Master)
LRCK (Slave)
BICK (128fs)
SDTO1 (O)
23 22
0
23 22
0
23 22
0
23 22
0
Data 1
Data 2
Data 3
Data 4
32 BICK
32 BICK
32 BICK
32 BICK
23 22
SDTO2 (O)
Figure 42. Mode 24/28 Timing (TDM128 mode, MSB Justified, 24-bit)
128 BICK
LRCK (Master)
LRCK (Slave)
BICK (128fs)
SDTO1 (O)
23 22
0
23 22
0
23 22
0
23 22
0
Data 1
Data 2
Data 3
Data 4
32 BICK
32 BICK
32 BICK
32 BICK
23 22
SDTO2 (O)
Figure 43. Mode 25/29 Timing (TDM128 mode, I2S Compatible)
128 BICK
LRCK (Master)
LRCK (Slave)
BICK (128fs)
SDTO1 (O)
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
Data 1
Data 2
Data 3
Data 4
32 BICK
32 BICK
32 BICK
32 BICK
0 31 30
SDTO2 (O)
Figure 44. Mode 26/30 Timing (TDM128 mode, MSB Justified)
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[AK5554]
128 BICK
LRCK (Master)
LRCK (Slave)
BICK (128fs)
SDTO1 (O)
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
Data 1
Data 2
Data 3
Data 4
32 BICK
32 BICK
32 BICK
32 BICK
0 31 30
SDTO2 (O)
Figure 45. Mode 27/31 Timing (TDM128 mode, I2S Compatible)
256 BICK
LRCK (Master)
LRCK (Slave)
BICK (256fs)
SDTO1 (O)
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
#2 Data 1 #2 Data 2 #2 Data 3 #2 Data 4 #1 Data 1 #1 Data 2 #1 Data 3 #1 Data 4
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
SDTO2 (O)
TDMIN (I)
23 22
(#1 SDTO1)
#1 Data 1 #1 Data 2 #1 Data 3 #1 Data 4
0
23 22
32 BICK
0
23 22
32 BICK
0
23 22
32 BICK
0
23 22
32 BICK
Figure 46. Mode 32/36 Timing (TDM256 mode, MSB Justified, 24-bit)
256 BICK
LRCK (Master)
LRCK (Slave)
BICK (256fs)
SDTO1 (O)
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23
#2 Data 1 #2 Data 2 #2 Data 3 #2 Data 4 #1 Data 1 #1 Data 2 #1 Data 3 #1 Data 4
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
SDTO2 (O)
TDMIN (I)
23 22
(#1 SDTO1)
#1 Data 1 #1 Data 2 #1 Data 3 #1 Data 4
0
32 BICK
23 22
0
32 BICK
23 22
0
23 22
32 BICK
0
23
32 BICK
Figure 47. Mode 33/37 Timing (TDM256 mode, I2S Compatible, 24-bit)
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[AK5554]
256 BICK
LRCK (Master)
LRCK (Slave)
BICK (256fs)
SDTO1 (O)
31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
#2 Data 1 #2 Data 2 #2 Data 3 #2 Data 4 #1 Data 1 #1 Data 2 #1 Data 3 #1 Data 4
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
SDTO2 (O)
TDMIN (I)
31 30
(#1 SDTO1)
#1 Data 1 #1 Data 2 #1 Data 3 #1 Data 4
1
0 31 30
32 BICK
1
0 31 30
32 BICK
1
0 31 30
32 BICK
1
0
31 30
32 BICK
Figure 48. Mode 34/38 Timing (TDM256 mode, MSB Justified, 32-bit)
256 BICK
LRCK (Master)
LRCK (Slave)
BICK (256fs)
SDTO1 (O)
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31
#2 Data 1 #2 Data 2 #2 Data 3 #2 Data 4 #1 Data 1 #1 Data 2 #1 Data 3 #1 Data 4
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
SDTO2 (O)
TDMIN (I)
31 30
(#1 SDTO1)
#1 Data 1 #1 Data 2 #1 Data 3 #1 Data 4
1
0 31 30
32 BICK
0 31 30
32 BICK
1
0 31 30
32 BICK
1
0
31
32 BICK
Figure 49. Mode 35/39 Timing (TDM256 mode, I2S Compatible, 32-bit)
512 BICK
LRCK (Master)
LRCK (Slave)
BICK (512fs)
SDTO1 (O)
23 22
0
23 33
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
#4 Data 1 #4 Data 2 #4 Data 3 #4 Data 4 #3 Data 1 #3 Data 2 #3 Data 3 #3 Data 4 #2 Data 1 #2 Data 2 #2 Data 3 #2 Data4 #1 Data 1 #1 Data 2 #1 Data 3 #1 Data 4
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
SDTO2 (O)
TDMIN (I)
23 22
(#3 SDTO1)
#3 Data 1 #3 Data 2 #3 Data 3 #3 Data 4 #2 Data 1 #2 Data 2 #2 Data 3 #2 Data 4 #1 Data 1 #1 Data 2 #1 Data 3 #1 Data 4
0
32 BICK
23 22
0
32 BICK
23 22
0
32 BICK
23 22
0
32 BICK
23 22
0
32 BICK
23 22
0
32 BICK
23 22
0
32 BICK
23 22
0
32 BICK
23 22
0
32 BICK
23 22
0
32 BICK
23 22
0
32 BICK
23 22
0
31 30
32 BICK
Figure 50. Mode 40/44 Timing (TDM512 mode, MSB Justified, 24-bit)
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[AK5554]
512 BICK
LRCK (Master)
LRCK (Slave)
BICK (512fs)
SDTO1 (O)
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23 22
0
23
#4 Data 1 #4 Data 2 #4 Data 3 #4 Data 4 #3 Data 5 #3 Data 6 #3 Data 7 #3 Data 8 #2 Data 1 #2 Data 2 #2 Data 3 #2 Data4 #1 Data 1 #1 Data 2 #1 Data 3 #1 Data4
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
SDTO2 (O)
TDMIN (I)
23 22
(#3 SDTO1)
#3 Data 1 #3 Data 2 #3 Data 3 #3 Data 4 #2 Data 1 #2 Data 2 #2 Data 3 #2 Data 4 #1 Data 1 #1 Data 2 #1 Data 3 #1 Data 4
0
23 22
32 BICK
0
23 22
32 BICK
0
23 22
32 BICK
0
23 22
32 BICK
0
23 22
32 BICK
0
23 22
32 BICK
0
23 22
32 BICK
0
23 22
32 BICK
0
23 22
32 BICK
0
23 22
32 BICK
0
23 22
32 BICK
0
23
32 BICK
Figure 51. Mode 41/45 Timing (TDM512 mode, I2S Compatible, 24-bit)
512 BICK
LRCK (Master)
LRCK (Slave)
BICK (512fs)
SDTO1 (O)
31 30
1 0 31 30
1 0 31 30
1 0 31 30
1 0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
#4 Data 1 #4 Data 2 #4 Data 3 #4 Data 4 #3 Data 1 #3 Data 2 #3 Data 3 #3 Data 4 #2 Data 1 #2 Data 2 #2 Data 3 #2 Data4 #1 Data 1 #1 Data 2 #1 Data 3 #1 Data 4
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
SDTO2 (O)
TDMIN (I)
31 30
(#3 SDTO1)
#3 Data 1 #3 Data 2 #3 Data 3 #3 Data 4 #2 Data 1 #2 Data 2 #2 Data 3 #2 Data 4 #1 Data 1 #1 Data 2 #1 Data 3 #1 Data 4
1 0 31 30
32 BICK
1 0 31 30
32 BICK
1 0 31 30
32 BICK
1 0 31 30
32 BICK
1
0 31 30
32 BICK
1
0 31 30
32 BICK
1
0 31 30
32 BICK
1
0 31 30
32 BICK
1
0 31 30
32 BICK
1
0 31 30
32 BICK
1
0 31 30
32 BICK
1
0
31 30
32 BICK
Figure 52. Mode 42/46 Timing (TDM512 mode, MSB Justified, 32-bit)
512 BICK
LRCK (Master)
LRCK (Slave)
BICK (256fs)
SDTO1 (O)
0 31 30
1 0 31 30
1 0 31 30
1 0 31 30
1 0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31 30
1
0 31
#4 Data 1 #4 Data 2 #4 Data 3 #4 Data 4 #3 Data 1 #3 Data 2 #3 Data 3 #3 Data 4 #2 Data 1 #2 Data 2 #2 Data 3 #2 Data4 #1 Data 1 #1 Data 2 #1 Data 3 #1 Data 4
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
32 BICK
SDTO2 (O)
TDMIN (I)
31 30
(#3 SDTO1)
#3 Data 1 #3 Data 2 #3 Data 3 #3 Data 4 #2 Data 1 #2 Data 2 #2 Data 3 #2 Data 4 #1 Data 1 #1 Data 2 #1 Data 3 #1 Data 4
1 0 31 30
32 BICK
1 0 31 30
32 BICK
1 0 31 30
32 BICK
1 0 31 30
32 BICK
1 0 31 30
32 BICK
1 0 31 30
32 BICK
1 0 31 30
32 BICK
1 0 31 30
32 BICK
1 0 31 30
32 BICK
1 0 31 30
32 BICK
0 1 31 30
32 BICK
1 0
31
32 BICK
Figure 53. Mode 43/47 Timing (TDM512 mode, I2S Compatible, 32-bit)
Parameter
MCLK “↑” to BICK “↓”
BICK “↓” to MCLK“↑”
Symbol
Min.
tMCB
tBIM
10
10
Typ.
Max
Unit
ns
ns
Table 10. TDM Mode Clock Timing
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[AK5554]
VIH
MCLK
VIL
tMCB
tBIM
VIH
BICK
VIL
Figure 54. Audio Interface Timing (Slave mode, TDM mode MCLK=2×BICK)
VIH
VIL
MCLK
tMCB
tBIM
VIH
VIL
BICK
Figure 55. Audio Interface Timing (Slave mode, TDM mode MCLK=BICK)
[2] DSD mode
DSD output is available only when the AK5554 is in Master mode.
The DCLK frequency can be selected from 64fs, 128fs and 256fs by setting the DSDSEL1-0 pins (bits).
The AK5554 enters Phase Modulation mode by setting PMOD pin = “H” or PMOD bit = “1”.
It does not support Phase Modulation mode when the DCLK frequency is 256fs. DCKB bit controls DCLK
polarity.
DCLK (64fs, 128fs, 256fs)
DCKB bit=”1”
DCLK (64fs, 128fs, 256fs)
DCKB bit=”0”
DSDOL, DSDOR
Normal
D0
DSDOL,DSDOR
Phase Modulation
D0
D1
D1
D2
D1
D2
D3
D2
D3
Figure 56. DSD Mode Timing
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[AK5554]
■ Channel Summation (PCM mode, DSD mode)
Channel Summation function improves the dynamic range and S/N performance by averaging all A/D
data of multiple-channel that the same signal is input. The AK5554 supports 4-to-2 mode and 4-to-1
mode.
4-to-2 mode (Stereo mode)
Improve the dynamic range and S/N for 3 dB (2 dB in DSD mode) by averaging two channels.
4-to-1 mode (Mono mode)
Improve the dynamic range and S/N for 6 dB (4 dB in DSD mode) by averaging four channels.
Not-Summation mode (2-Stereo mode)
Normal mode that does not execute Summation is called as Not-Summation mode or 2-Stereo mode.
Refer to the section “CH Power Down & Channel Summation mode” for details.
■ Optimal Data Placement Mode (PCM Mode, DSD Mode)
Assigned data to the SDTO1/2 slot is controlled by the ODP pin setting in parallel control mode.
When the ODP pin = “L”, the data is output by Fixed Data Placement mode. Channel assignment of data
slot is fixed regardless of enable/disable of channel summation. For example, averaging data of two
channels are output to both channel slots.
When the ODP pin = “H”, the data is output by Optimal Data Placement mode that is uses data slot more
efficiently. In Optimal Data Placement mode, there are no data redundant of channel summation, and the
data is output in MSB justified. Therefore, the maximum number of connecting device in cascade
connection will be increased. If the AK5554 is set to 4-to-2 mode (Stereo Mode), two devices can be
connected in TDM128 mode, four devices can be connected in TDM256 mode and eight devices can be
connected in TDM512 mode. If the AK5554 is set to 4-to-1 mode (Mono Mode), four devices can be
connected in TDM128 mode, eight devices can be connected in TDM256 mode and sixteen devices can
be connected in TDM512 mode.
In serial control mode, the data output is Optimal Data Placement mode regardless of the ODP pin
setting.
Refer to “CH Power Down & Channel Summation mode” for details.
■ CH Power Down & Channel Summation (PCM mode, DSD mode)
[1] Parallel mode
The setting of the PW2-0 pins and the ODP pin controls the channel power-down and channel
summation mode setting in parallel mode (Table 11 - Table 16). The PDN pin must be set to “L” when
changing the ODP pin and the PW2-0 pins. The power consumption of the device can be improved by
setting unused channels to power-down state. In this case, the channel circuit that is powered down will
be reset.
When the ODP pin = “L”, the PW2-0 pins control channel power-down and 4-to-2 mode.
In 4-to-2 mode, AIN1 and AIN2 channel data are summed digitally and output from the SDTO1 (DSDOL1
and DSDOR1) by dividing into half amplitude. In the same manner, AIN3 and AIN4 channel data are
summed digitally and output from the SDTO2 (DSDOL2 and DSDOR2) by dividing into half amplitude.
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[AK5554]
Power ON/OFF
PW2 PW1 PW0
pin
pin
pin
Ch4 Ch3 Ch2 Ch1
L
L
L
OFF OFF OFF OFF
L
L
H
ON
ON OFF OFF
L
H
L
OFF OFF ON ON
L
H
H
ON
ON
ON ON
H
L
L
OFF ON
ON ON
H
L
H
ON
ON OFF OFF
H
H
L
OFF OFF ON ON
H
H
H
ON
ON
ON ON
Table 11. Channel Power ON/OFF (Parallel Control Mode, ODP pin= ”L”)
PW2
pin
L
L
L
L
H
H
H
H
PW1
pin
L
L
H
H
L
L
H
H
Data on Slot
PW0
pin
Slot 4
Slot 3
Slot 2
Slot 1
L
All “0”
All “0”
All “0”
All “0”
H
(CH3+4)/2
(CH3+4)/2
All “0”
All “0”
L
All “0”
All “0”
(CH1+2)/2
(CH1+2)/2
H
(CH3+4)/2
(CH3+4)/2
(CH1+2)/2
(CH1+2)/2
L
All “0”
CH3
CH2
CH1
H
CH4
CH3
All “0”
All “0”
L
All “0”
All “0”
CH2
CH1
H
CH4
CH3
CH2
CH1
Table 12. Slot Data Assign (Parallel Control Mode, ODP pin= “L”)
When the ODP pin = “H”, the AK5554 becomes optimal data placement mode and data slots can be used
efficiently. The PW2-0 pins control power down, 4-to-2 mode and 4-to-1 mode.
In 4-to-2 mode, AIN1 and AIN2 channel data are summed digitally and output from the SDTO1
(DSDOL1) by dividing into half amplitude. In the same manner, AIN3 and AIN4 channel data are
summed digitally and output from the SDTO1 (DSDOR2) by dividing into half amplitude.
In 4-to-1 mode, AIN1 - AIN4 channel data are summed digitally and output from the SDTO1 (DSDOL1) of
the slot1 by dividing into quarter amplitude.
Power ON/OFF
PW2 PW1 PW0
pin
pin
pin
Ch4 Ch3 Ch2 Ch1
L
L
L
OFF OFF OFF OFF
L
L
H
ON
ON
ON ON
L
H
L
ON
ON
ON ON
L
H
H
ON
ON
ON ON
H
L
L
ON
ON
ON ON
H
L
H
ON
ON
ON ON
H
H
L
ON
ON
ON ON
H
H
H
ON
ON
ON ON
Table 13. Channel Power ON/OFF (Parallel Control mode, ODP pin= ”H”)
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[AK5554]
PW2
pin
L
L
L
L
H
H
H
H
Data on Slot
PW1
PW0
pin
pin
Slot 4
Slot 3
Slot 2
Slot 1
L
L
All “0”
All “0”
All “0”
All “0”
L
H
All “0”
All “0”
(CH3+4)/2
(CH1+2)/2
H
L
CH4
CH3
CH2
CH1
H
H
All “0”
All “0”
All “0”
(CH1+2+3+4)/4
L
L
CH4
CH3
CH2
CH1
L
H
All “0”
All “0”
(CH3+4)/2
(CH1+2)/2
H
L
CH4
CH3
CH2
CH1
H
H
All “0”
All “0”
All “0”
(CH1+2+3+4)/4
Table 14. Slot Data Assign (Parallel Control mode, ODP pin= ”H”, Normal Output)
PW2
pin
L
L
L
L
H
H
H
H
Data on Slot
PW1
PW0
pin
pin
Slot 4
Slot 3
Slot 2
Slot 1
L
L
All “0”
All “0”
All “0”
All “0”
L
H
TDMIN
TDMIN
(CH3+4)/2
(CH1+2)/2
H
L
CH4
CH3
CH2
CH1
H
H
TDMIN
TDMIN
TDMIN
(CH1+2+3+4)/4
L
L
CH4
CH3
CH2
CH1
L
H
TDMIN
TDMIN
(CH3+4)/2
(CH1+2)/2
H
L
CH4
CH3
CH2
CH1
H
H
TDMIN
TDMIN
TDMIN
(CH1+2+3+4)/4
Table 15. Slot Data Assign (Parallel Control mode, ODP pin= ”H”, TDM128)
Data on Slot
PW2
PW1
PW0
pin
pin
pin
Slot 4
Slot 3
Slot 2
Slot 1
L
L
L
All “0”
All “0”
All “0”
All “0”
L
L
H
TDMIN
TDMIN
(CH3+4)/2
(CH1+2)/2
L
H
L
CH4
CH3
CH2
CH1
L
H
H
TDMIN
TDMIN
TDMIN
(CH1+2+3+4)/4
H
L
L
CH4
CH3
CH2
CH1
H
L
H
TDMIN
TDMIN
(CH3+4)/2
(CH1+2)/2
H
H
L
CH4
CH3
CH2
CH1
H
H
H
TDMIN
TDMIN
TDMIN
(CH1+2+3+4)/4
Table 16. Slot Data Assign (Parallel Control mode, ODP pin= ”H”, TDM256 & TDM512)
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[AK5554]
[2] Serial Mode
In 3-wire serial mode or I2C mode, PW1-4 bits control the power of AIN1-4 channels independently. AINn
channel is powered down when PWn bit = “0” (n=1-4) and AINn channel is in normal operation when
PWn bit = “1”. The power-down channel is reset status and outputs all “0”. The channel summation is
controlled by MONO1 and MONO2 bits. RSTN bit must be “0” when changing the setting of MONO1,
MONO2 and PW1-4 bits.
Data on Slot (Normal Output)
MONO2
MONO1
bit
bit
Slot 4
Slot 3
Slot 2
Slot 1
0
0
CH4
CH3
CH2
CH1
0
1
All “0”
All “0”
(CH3+4)/2
(CH1+2)/2
1
0
CH4
CH3
CH2
CH1
1
1
All “0”
All “0”
All “0”
(CH1+2+3+4)/4
Table 17. Slot Data Assign (Serial Control mode, Normal Output or DSD mode)
Data on Slot (TDM128)
MONO1
bit
Slot 4
Slot 3
Slot 2
0
CH4
CH3
CH2
1
TDMIN
TDMIN
(CH3+4)/2
0
CH4
CH3
CH2
1
TDMIN
TDMIN
TDMIN
Table 18. Slot Data Assign (Serial Control mode, TDM128)
MONO2
bit
0
0
1
1
MONO2
bit
0
0
1
1
Slot 1
CH1
(CH1+2)/2
CH1
(CH1+2+3+4)/4
Data on Slot (TDM256, TDM512)
MONO1
bit
Slot 4
Slot 3
Slot 2
Slot 1
0
CH4
CH3
CH2
CH1
1
TDMIN
TDMIN
(CH3+4)/2
(CH1+2)/2
0
CH4
CH3
CH2
CH1
1
TDMIN
TDMIN
TDMIN
(CH1+2+3+4)/4
Table 19. Slot Data Assign (Serial Control mode, TDM256 & TDM512)
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[AK5554]
■ Data Slot Configuration
[1] PCM mode
LRCK Period = 1/fs
Normal Output
SDTO1 pin
Slot 1
Slot 2
SDTO2 pin
Slot 3
Slot 4
LRCK Period = 1/fs
TDM128
SDTO1 pin
Slot 1
Slot 2
Slot 3
Slot 4
All “0”
SDTO2 pin
LRCK Period = 1/fs
TDM256
SDTO1 pin
Slot 1 Slot 2 Slot 3 Slot 4
TDMI
All “0”
SDTO2 pin
LRCK Period = 1/fs
TDM512
SDTO1 pin
1
2
3
4
TDMI
All “0”
SDTO2 pin
Figure 57. Slot Assign in PCM mode
[2] DSD mode
LRCK Period = 1/fs
DSDOL1 pin
Slot 1
DSDOR1 pin
Slot 2
DSDOL2 pin
Slot 3
DSDOR2 pin
Slot 4
Figure 58. Slot Assign in DSD mode
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[AK5554]
■ Digital Filter Setting (PCM mode)
The AK5554 has four types of digital filters and they can be selected by SD pin (bit) and SLOW pin (bit).
The filter setting is not available in OCT speed mode, HEX speed mode and DSD mode. So the setting of
the digital filter is ignored.
SD
pin (bit)
L (0)
L (0)
H (1)
H (1)
SLOW
Filter
pin (bit)
L (0)
Sharp Roll-off Filter
H (1)
Slow Roll-off Filter
L (0)
Short Delay Sharp Roll-off Filter
H (1)
Short Delay Slow Roll-off Filter
Table 20. Digital Filter Setting
■ Digital HPF (PCM mode)
The AK5554 has a digital high-pass filter for DC offset (include internal offset) cancelation. The digital
high-pass filter is enabled by setting the HPFE pin (bit) = “H (1)”. The cut-off frequency of the high-pass
filter is fixed 1.0 Hz when fs= 48kHz (Normal Speed mode), 96 kHz (Double Speed mode) or 192 kHz
(Quad Speed mode). The high-pass filter is not available in OCT speed mode, HEX speed mode and
DSD mode. So that the setting of the HPFE pin is ignored. The high pass-filter setting should be changed
when all channels are reset condition.
■ Overflow Detection (PCM mode, DSD mode)
[1] PCM mode
The AK5554 has an overflow detect function for the analog input. The OVF pin outputs “H” if one of AIN1
- 4 channel overflows (more than −0.3 dBFS). The OVF pin returns to “L” when analog input overflows are
resolved. The OVF output for overflowed analog input has the same group delay as the ADC.
[2] DSD mode
Overflow Detection (Error Detection Function)
The OVF pin outputs “H” if any channel’s DSD modulators overflows. The OVF pin returns to “L” when
overflows are resolved.
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[AK5554]
■ LDO
The voltage range of TVDD is from 1.7 V to 1.98 V or from 3.0 V to 3.6 V. Set ON/OFF of the LDO by the
LDOE pin according to TVDD voltage (Table 21).
The internal LDO is switched ON/OFF depending on TVDD voltage range.
LDOE
PDN
LDO
L
L
H
H
L
H
L
H
OFF
OFF
OFF
ON
VDD18 pin
External Power Input 1.7-1.98 V
External Power Input 1.7-1.98 V
Pulled Down by 500 internally
LDO Voltage Output
Table 21. LDO Control
Additional Voltage Range to
TVDD pin
1.7-1.98 V
1.7-1.98 V
3.0-3.6 V
3.0-3.6 V
[1] TVDD=1.7-1.98 V, LDO is OFF (LDOE pin = “L”)
The internal LDO does not work properly when the TVDD voltage range is from 1.7 V to 1.98 V. Set the
LDOE pin to “L” to switch OFF the LDO. A 1.7 V - 1.98 V is supplied from the VDD18 pin for internal logic
circuits. The voltage difference between TVDD and VDD18 must be ±0.1 V or less.
[2] TVDD=3.0-3.6 V, LDO is ON (LDOE pin = “H”)
The internal LDO should be ON when the TVDD voltage range is from 3.0 V to 3.6 V. It will be the power
supply for the internal logic circuit. The VDD18 pin will be a connection terminal for a stabilization
capacitor. It is not possible to supply the power to external circuits from the VDD18 pin.
■ Reset
The AK5554 must be reset upon power up or when changing the clock setting or clock frequency. It can
be reset by the PDN pin and PW2-0 pins or RSTN bit and PW4-1 bits.
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[AK5554]
■ Power Down Function/ Sequence
The AK5554 enters power-down mode by setting the PDN pin to “L”. Digital filters are reset at the same
time.
[1] PCM Mode
In slave mode, internal power down signal (Internal PDN) is released by inputting MCLK, BICK and
LRCK after setting the PDN pin to “H”. In master mode, The Internal PDN is released by inputting
MCLK after setting the PDN pin to “H”.
Initialization cycle starts when the Internal PDN is released. The output data of SDTO will be valid in
583 x 1/fs after exiting power-down mode in slave mode, it will be valid in 578 x 1/fs after exiting
power-down mode in master mode. During initialization, the ADC digital outputs of both channels are in
2’s complement format and forced to “0”. The ADC outputs settle to data correspondent to the input
signals after the end of initialization. This settling takes approximately the group delay time.
Power
PDN pin
(1)
VDD18 pin
(2)
Internal PDN
(3)
Internal
State
Power -down
Initialize
Normal Operation
Power -down
ADC In
(Analog)
GD
(5)
(5)
GD
(4)
(4)
ADC Out
(Digital)
“0”data
Idle Noise
“0”data
Idle Noise
(6)
Clock In
Don’t care
Don’t care
MCLK,LRCK,BICK
Figure 59. Power-Up/Down Sequence Example
Notes:
(1) The PDN pin should be held to “L” for more than 150 ns after AVDD and TVDD are powered up.
(2) a. LDOE pin = “H”, I2C pin = “H” and PSN pin = “H” (Parallel Mode):
The internal LDO is powered up by releasing PDN pin to “H”. The Internal PDN is released by
toggling MCLK for 16384times.
b. LDOE pin = “H” and PSN pin = “L” (Register Mode):
The internal LDO is powered up by releasing PDN pin to “H”. The internal PDN is released by
toggling internal oscillator clock for 16384 times (max. 10 ms).
c. LDOE pin = “L”:
The internal PDN is released in 1 ms (max.) after releasing PDN pin to “H”.
During this period, digital output and digital in/output pins may output an instantaneous pulse (max. 1
us). Therefore, referring the output of digital pins and data transmission with a device on the same
3-wire serial/I2C bus as the AK5554 should be avoided in this period to prevent system errors.
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[AK5554]
(3) Initialization cycle is 583/fs in slave mode and 578/fs in master mode.
(4) The ADC output data is “0” during initialization cycle and power-down mode.
(5) The digital output corresponding to analog input has group delay (GD).
Internal PDN Release Sequence
LDOE pin=H
parallel mode
PDN
MCLK
REF_PDN
14336 MCLK (min 280usec MCLK=50Meg、max 7.2msec MCLK=2Meg)
Shutdown_SW_N
CNTUP_T
2048 MCLK
Internal_PDN
LDOE pin=H
serial mode
PDN
MCLK don't care
REF_PDN
14336 OSCCLK (min 380usec OSCCLK=37.5Meg、max 850usec OSCCLK=17Meg)
Shutdown_SW_N
CNTUP_T
2048 OSCCLK
Internal_PDN
LDOE pin = L
PDN
MCLK
REF_PDN
Shutdown_SW_N
CNTUP_T
Internal_PDN
max 1msec
Figure 60. Internal PDN Release Sequence
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[AK5554]
[2] DSD mode
The Internal PDN is released by inputting MCLK after setting the PDN pin to “H”.
PDN pin
Internal PDN
(1)
MCLK In
Don’t care
Internal
State
Power-Down
Don’t care
Initialize
Normal Operation
Power-Down
(2)
ADC In
(Analog)
(6)
(4)
OVF-pin
(5)
(3)
DSD Out
(Digital)
“L” (-full scale data)
normal data
abnormal data
normal data
“L” (-full scale data)
Figure 61. DSD Operation Timing
Notes:
(1) The internal LDO is powered up by releasing PDN pin to “H”. The internal PDN is released by
toggling internal oscillator clock for 16384 times (max. 10ms).
The internal PDN is released in max. 1 ms after releasing PDN pin to “H”.
Register writings become available when the internal PDN changes to “1”.
During this period, digital output and digital in/output pins may output an instantaneous pulse (max.
1 us). Therefore, referring the output of digital pins and data transmission with a device on the same
3-wire serial/I2C bus as the AK5554 should be avoided in this period to prevent system errors.
(2) Initialization operation will be completed in 583/fs.
(3) DSD output pins output “L” (-full scale data) during power down and initializing operation. DSD
output pins output full scale data during phase modulation mode, a reset sequence and a CH power
down status.
(4) The OVF pin outputs “H” when an excessive signal is input and overflow is detected at internal
modulator. The OVF pin status will change after group delay period from the excessive input.
(5) In the case above (4), the DSD output data will not be correct.
(6) The OVF pin returns to “L” when the input signal settled to a normal state and overflow status of the
internal modulator is resolved. The OVF pin status will change after group delay period from the
normal input.
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[AK5554]
■ Operation Mode Control
Operation modes of the AK5554 are set by pins or registers. In parallel mode, the operation mode is set
by pin and register settings are invalid. Therefore the functions that needs register settings are not
available in parallel mode. For register accessing, 3-wire serial and I2C bus communications are
available. This control mode of the AK5554 is selected by the I2C pin and the PSN pin. In serial control
mode, register settings are prioritized so that all pin settings except the MSN pin setting are ignored.
I2C pin
L
L
H
H
PSN pin
Control Mode
L
3-wire Serial
H
3-wire Serial
L
I2C Bus
H
Parallel
Table 22. Control Mode
■ Register Control Interface
(1) 3-wire Serial Control mode (I2C pin = “L”)
The internal registers may be written through the 3-wire µP interface pins (CSN, CCLK and CDTI).
The data on this interface consists of a 2-bit Chip address, Read/Write (1bit, Fixed to “1”, Write only),
Register address (MSB first, 5bits) and Control data (MSB first, 8bits). Address and data are clocked
in on the rising edge of CCLK and data is clocked out on the falling edge. For write operations, data
is latched after a low-to-high transition of CSN. The clock speed of CCLK is 5MHz (max).
The internal registers are initialized by setting the PDN pin = “L”. In serial mode, an internal timing
circuit is reset by setting RSTN bit = “0” but register values are not initialized.
CSN
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
CCLK
CDTI
C1 C0 R/W A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1
C1-C0:
R/W:
A4-A0:
D7-D0:
D0
Chip Address (C1=CAD1, C0=CAD0)
READ/WRITE (Fixed to “1”, Write only)
Register Address
Control Data
Figure 62. Control I/F Timing
* The AK5554 does not support read commands in 3-wire serial control mode.
* When the AK5554 is in power down mode (PDN pin = “L”), a writing into the control registers is
prohibited.
* The control data cannot be written when the CCLK rising edge is 15 times or less, or 17 times or more
during CSN is “L”.
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[AK5554]
Precautions when using the 3-wire serial interface
The I2C interface block continues to run, even when the 3-wire serial interface is selected. Therefore, if
CDTI (SDA) transitions from "H" to "L" while CCLK (SCL) is "H", the I2C interface recognizes this as a
start condition and receives subsequent data. If this data string matches the slave address, the I2C
interface outputs the ACK signal and data to the CDTI (SDA) pin. As a result, the CDTI (SDA) pin would
experience a drive conflict resulting from the I2C block’s output and the 3-wire serial interface’s input. In
this scenario, the data cannot be reliably written to the register.
CSN
(CAD0)
CCLK
(SCL)
3-wire Serial Interface Format
CDTI
(SDA)
D1 D0
C1 C0 W A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0
A3
I2C Interface Format
Read Operation
CDTI
(SDA)
0
0
1
0
0
CAD CAD
1
0
ACK
R
D7 D6 D5 D4 D3 D2 D1
Output
Slave Address
Write Operation
CDTI
(SDA)
0
START Condition
0
1
0
0
CAD CAD
1
0
Slave Address
W
ACK
D7 D6 D5 D4 D3 D2 D1
Output
Figure 63. Comparison of 3-wire Serial and I2C Interface Timing
To prevent the above situation when using the 3-wire serial interface, change CDTI only at the falling
edge of CCLK in order to avoid generation of a start condition.
Example 1) When CCLK is not stopped while CSN is "H"
CSN
(CAD0)
CCLK
(SCL)
Don’t Care
CDTI
(SDA)
D1 D0
C1 C0 W A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0
A3
Figure 64. CDTI Change Timing Example 1
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Example 2) When CCLK is stopped while CSN is "H"
CSN
(CAD0)
CCLK
(SCL)
CDTI
(SDA)
D1
D0
C1 C0 W A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0
A3
Figure 65. CDTI Change Timing Example 2
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[AK5554]
(2) I2C-bus Control mode (I2C pin = “H” and PSN pin = “L”)
The AK5554 supports the fast-mode I2C-bus (max: 400 kHz, Ver1.0).
(2)-1. WRITE Operations
Figure 66 shows the data transfer sequence of the I2C-bus mode. All commands are preceded by a
START condition. A HIGH to LOW transition on the SDA line while SCL is HIGH indicates a START
condition (Figure 72). After the START condition, a slave address is sent. This address is 7 bits long
followed by the eighth bit that is a data direction bit (R/W). The most significant five bits of the slave
address are fixed as “00100”. The next bits are CAD1-0 (device address bits). This bits identifies the
specific device on the bus. The hard-wired input pins (CAD1-0 pins) set these device address bit (Figure
67). If the slave address matches that of the AK5554, the AK5554 generates an acknowledge and the
operation is executed. The master must generate the acknowledge-related clock pulse and release the
SDA line (HIGH) during the acknowledge clock pulse (Figure 73). R/W bit = “1” indicates that the read
operation is to be executed. “0” indicates that the write operation is to be executed.
The second byte consists of the control register address of the AK5554. The format is MSB first, and
those most significant 3-bits are fixed to zeros (Figure 68). The data after the second byte contains
control data. The format is MSB first, 8bits (Figure 69). The AK5554 generates an acknowledge after
each byte is received. Data transfer is always terminated by a STOP condition generated by the master.
A LOW to HIGH transition on the SDA line while SCL is HIGH defines STOP condition (Figure 72).
The AK5554 can perform more than one byte write operation per sequence. After receipt of the third byte
the AK5554 generates an acknowledge and awaits the next data. The master can transmit more than
one byte instead of terminating the write cycle after the first data byte is transferred. After receiving each
data packet the internal 6-bit address counter is incremented by one, and the next data is automatically
taken into the next address. If the address exceeds “07H” prior to generating a stop condition, the
address counter will “roll over” to “00H” and the previous data will be overwritten.
The data on the SDA line must remain stable during the HIGH period of the clock. The HIGH or LOW
state of the data line can only change when the clock signal on the SCL line is LOW (Figure 74) except
for the START and STOP conditions.
S
T
A
R
T
SDA
S
S
T
O
P
R/W= “0”
Slave
Address
1st byte
Sub
Address(n)
A
C
K
2nd byte
Data(n)
A
C
K
Data(n+1)
A
C
K
3rd byte
Data(n+x)
A
C
K
A
C
K
P
A
C
K
Figure 66. Data Transfer Sequence at the I2C-Bus Mode
0
0
1
0
0
CAD1
CAD0
R/W
A1
A0
D1
D0
(CAD0 and CAD1 are set by pins)
Figure 67. The First Byte
0
0
0
A4
A3
A2
Figure 68. The Second Byte
D7
D6
D5
D4
D3
D2
Figure 69. Byte Structure After The Second Byte
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[AK5554]
(2)-2. READ Operations
Set the R/W bit = “1” for the READ operation of the AK5554. After transmission of data, the master can
read the next address’s data by generating an acknowledge instead of terminating the write cycle after
the receipt of the first data word. After receiving each data packet the internal 6-bit address counter is
incremented by one, and the next data is automatically taken into the next address. If the address
exceeds “07H” prior to generating stop condition, the address counter will “roll over” to “00H” and the data
of “00H” will be read out.
The AK5554 supports two basic read operations: Current Address Read and Random Address Read.
(2)-2-1. Current Address Read
The AK5554 contains an internal address counter that maintains the address of the last word accessed,
incremented by one. Therefore, if the last access (either a read or write) was to address “n”, the next
CURRENT READ operation would access data from the address “n+1”. After receipt of the slave address
with R/W bit “1”, the AK5554 generates an acknowledge, transmits 1-byte of data to the address set by
the internal address counter and increments the internal address counter by 1. If the master does not
generate an acknowledge but generates a stop condition instead, the AK5554 ceases transmission.
S
T
A
R
T
SDA
S
S
T
O
P
R/W= “1”
Slave
Address
Data(n)
A
C
K
Data(n+1)
A
C
K
Data(n+2)
A
C
K
Data(n+x)
A
C
K
A
C
K
P
A
C
K
Figure 70. Current Address Read
(2)-2-2. Random Address Read
The random read operation allows the master to access any memory location at random. Prior to issuing
a slave address with the R/W bit =“1”, the master must execute a “dummy” write operation first. The
master issues a start request, a slave address (R/W bit = “0”) and then the register address to read. After
the register address is acknowledged, the master immediately reissues the start request and the slave
address with the R/W bit =“1”. The AK5554 then generates an acknowledge, 1 byte of data and
increments the internal address counter by 1. If the master does not generate an acknowledge but
generates a stop condition instead, the AK5554 ceases transmission.
S
T
A
R
T
SDA
S
S
T
A
R
T
R/W= “0”
Slave
Address
Sub
Address(n)
A
C
K
S
A
C
K
S
T
O
P
R/W= “1”
Slave
Address
Data(n)
A
C
K
Data(n+1)
A
C
K
Data(n+x)
A
C
K
A
C
K
P
A
C
K
Figure 71. Random Address Read
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[AK5554]
SDA
SCL
S
P
start condition
stop condition
Figure 72. START and STOP Conditions
DATA
OUTPUT BY
TRANSMITTER
not acknowledge
DATA
OUTPUT BY
RECEIVER
acknowledge
SCL FROM
MASTER
2
1
8
9
S
clock pulse for
acknowledgement
START
CONDITION
Figure 73. Acknowledge on the I2C-Bus
SDA
SCL
data line
stable;
data valid
change
of data
allowed
Figure 74. Bit Transfer on the I2C-Bus
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[AK5554]
■ Register Map
Addr
00H
01H
02H
03H
04H
05H
06H
07H
Register Name
Power Management1
Power Management2
Control 1
Control 2
Control 3
DSD
TEST1
TEST2
D7
1
0
0
0
DP
0
TST7
0
D6
1
0
CKS3
TDM1
0
0
TST6
0
D5
1
0
CKS2
TDM0
0
DCKS
TST5
0
D4
1
0
CKS1
0
0
0
TST4
0
D3
PW4
0
CKS0
0
0
PMOD
TST3
0
D2
PW3
MONO2
DIF1
0
0
DCKB
TST2
0
D1
PW2
MONO1
DIF0
0
SD
DSDSEL1
TST1
0
D0
PW1
RSTN
HPFE
0
SLOW
DSDSEL0
TST0
TRST
Note 24. Data must not be written into addresses from “06H” to “1FH”.
Note 25. The bits indicated as “0” must contain a “0” value. When RSTN bit is set to “0”, the internal digital
filter and the control block are reset but the register values are not initialized.
Note 26. When the PDN pin is set to “L”, all registers are initialized to their default values.
■ Register Definitions
Addr
00H
Register Name
D7
D6
Power Management1
1
1
R/W
R/W
R/W
Default
1
1
PW4-1: Power Down control for channel 4-1
0: power OFF
1: power ON (default)
D5
1
R/W
1
D4
1
R/W
1
D3
PW4
R/W
1
Addr
01H
Register Name
D7
D6
D5
D4
D3
Power Management2
0
0
0
0
0
R/W
R/W R/W R/W R/W R/W
Default
0
0
0
0
0
RSTN: Internal Timing Reset
0: Reset. All registers are not initialized.
1: Normal Operation (default)
Internal clock timings are reset but registers are not reset.
D2
PW3
R/W
1
D2
MONO2
R/W
0
D1
PW2
R/W
1
D0
PW1
R/W
1
D1
MONO1
R/W
0
D0
RSTN
R/W
1
D1
DIF0
R/W
0
D0
HPFE
R/W
1
MONO2-1: Channel Summation Mode Select (Table 17-Table 19)
00: Not- Summation mode (default)
01: 4-to-2 mode
10: Not- Summation mode
11: 4-to-1 mode
Addr
02H
Register Name
D7
D6
D5
D4
Control 1
0
CKS3 CKS2 CKS1
R/W
R/W
R/W
R/W
R/W
Default
0
0
0
0
HPFE: High Pass Filter Enable
0: High Pass Filter OFF
1: High Pass Filter ON (default)
When this bit is “1”, digital HPFs for all channels are ON.
D3
CKS0
R/W
0
D2
DIF1
R/W
0
DIF1-0: Audio Data Interface Modes Select (Table 8, Table 9)
Select A/D data bit length (24-bit/32-bit) and the format (MSB justified/ I2S Compatible)
CKS3-0: Sampling Speed Mode and MCLK Frequency Select (Table 5)
Select Sampling Speed and MCLK frequency.
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[AK5554]
Addr
03H
Register Name
D7
D6
D5
D4
D3
D2
D1
D0
Control 2
0
TDM1 TDM0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default
0
0
0
0
0
0
0
0
TDM1-0: TDM Modes Select (Table 9)
Select the A/D data output mode from Normal, TDM128, TDM256 and TDM512 modes.
Addr
04H
Register Name
D7
D6
D5
Control 3
DP
0
0
R/W
R/W
R/W
R/W
Default
0
0
0
SLOW: Slow Roll-off Filter Select (Table 20)
0: Sharp Roll-off (default)
1: Slow Roll-off
Select Roll-off characteristic of the digital filter.
SD:
Short Delay Select (Table 20)
0: Normal Delay (default)
1: Short Delay
Select group delay of the digital filter.
DP:
DSD Mode Select
0: PCM Mode (default)
1: DSD Mode
Select Output Mode.
Addr Register Name
D7
D6
05H DSD
0
0
R/W
R/W
R/W
Default
0
0
DSDSEL1-0: Select the Frequency of DCLK
00: 64fs (default)
01: 128fs
10: 256fs
11: Reserved
D5
DCKS
R/W
0
D4
0
R/W
0
D4
0
R/W
0
D3
0
R/W
0
D3
PMOD
R/W
0
D2
0
R/W
0
D1
SD
R/W
0
D0
SLOW
R/W
0
D2
D1
D0
DCKB DSDSEL1 DSDSEL0
R/W
R/W
R/W
0
0
0
DCKB: Polarity of DCLK
0: DSD data is output from DCLK Falling Edge (default)
1: DSD data is output from DCLK Rising Edge
PMOD: DSD Phase Modulation Mode
0: Not Phase Modulation Mode (default)
1: Phase Modulation Mode
DSD Output Phase Modulation Mode Enable
DCKS: Master Clock Frequency Select at DSD Mode (DSD Only)
0: 512fs (default)
1: 768fs
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[AK5554]
Addr
06H
Register Name
D7
D6
D5
D4
D3
D2
D1
D0
TEST 1
TST7 TST6 TST5 TST4 TST3 TST2 TST1 TST0
R/W
RD
RD
RD
RD
RD
RD
RD
RD
Default
0
0
0
0
0
0
0
0
TST7-0: Test register.
This register must be used as the default setting. Normal operation is not guaranteed if all bits
are not “0”.
Addr
07H
Register Name
D7
D6
D5
D4
D3
D2
D1
D0
TEST 2
0
0
0
0
0
0
0
TRST
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
W
Default
0
0
0
0
0
0
0
0
TRST: Test register.
This register must be “0”.
This register must be used as the default setting. Normal operation is not guaranteed if all bits
are not “0”.
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[AK5554]
Digital 3.3V
34
33
32
31
30
29
28
27
26
25
SLOW/DCKB 35
CKS3/CAD1
CKS2/SCL/CCLK
CKS1/CAD0_I2C/CSN
CKS0/SDA/CDTI
OVF
SDTO2/DSDOR2
SDTO1/DSDOL2
TDMIN/DSDOR1
LRCK/DSDOL1
BICK/DCLK
DIF1/DSDSEL1
TDM0
TDM1
PSN/CAD0_SPI
I2C
DP
HPFE/DCKS
LDOE
ODP
AIN1P
AIN1N
AK5554
Top View
MSN
PW2
PW1
PW0
PDN
VDD18
DVSS
TVDD
MCLK
TEST
AIN4P
AIN4N
24
23
22
21
20
19
18
17
16
15
14
13
Mode
Setting
0.1 4.7
Controller
+
+
0.1
10
Digital 3.3V
Master Clock
AIN4+
AIN4−
20
+
0.1
AIN3+
AIN3−
100
Analog 5V
0.1
+
10
AIN2−
AIN2+
Analog 5V
Analog 5V
20
100
+
0.1
1
2
3
4
5
6
7
8
9
10
11
12
AIN1+
AIN1−
DIF0/
DSDSEL0
Controller
NC
VREFL1
VREFH1
AIN2N
AIN2P
AVDD
AVSS
AIN3P
AIN3N
VREFH2
VREFL2
NC
Mode
Setting
37
38
39
40
41
42
43
44
45
46
47
48
SD/PMOD 36
Mode
Setting
fs
64fs
13. Recommended External Circuits
Figure 75 shows recommended external connection.
Figure 75. Typical Connection Diagram
Note 27. All digital input pins must not be allowed to float.
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[AK5554]
1. Grounding and Power Supply Decoupling
The AK5554 requires careful attention to power supply and grounding arrangements. Normally AVDD
and TVDD are supplied from analog supply of the system. The power-up sequence between AVDD and
TVDD are not critical when AVDD and TVDD are supplied separately. DVSS and AVSS must be
connected to the same analog ground plane. System analog ground and digital ground should be
wired separately and connected together as close as possible to where the supplies are brought onto the
printed circuit board. Decoupling capacitors for high frequency should be placed as near as possible to
the supply pin.
2. Reference Voltage
The differential voltage between the VREFH1-2 pins and the VREFL1-2 pins are the common voltage of
A/D conversion. The VREFL1-2 pins are normally connected to AVSS. In order to remove a high
frequency noise, connect a 20 Ω resistor between the VREFH1-2 pins and analog 5 V supply, and
connect a 0.1 μF ceramic capacitor in parallel with an 100 μF electrolytic capacitor between the
VREFH1-2 pins and the VREFL1-2 pins. Especially the ceramic capacitor should be connected as close
as possible to the pin. All digital signals, especially clocks, should be kept away from the VREFH1-2 pins
and VREFL1-2 pins in order to avoid unwanted noise coupling into the AK5554.
3. Analog Inputs
The Analog input signal is differentially supplied into the modulator via the AINn+ and the AINn- pins (n=
1-4). The input voltage is the difference between the ALINn+ and ALINn- pins (n= 1-4). The full scale
signal on each pin is nominally ±2.8 V (typ). A voltage from AVSS to AVDD can be input to the AK5554.
The output code format is two’s complement. The internal HPF removes DC offset (including DC offset
by the ADC itself).
The AK5554 requires a +5 V analog supply voltage. Any voltage which exceeds the upper limit of
AVDD+0.3 V and lower limit of AVSS−0.3 V and any current beyond 10 mA for the analog input pins
should be avoided. Excessive currents to the input pins may damage the device. Hence input pins must
be protected from signals at or beyond these limits. Use caution especially when using ±15 V for other
analog circuits in the system.
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[AK5554]
4. External Analog Circuit Examples
Figure 76 shows an input buffer circuit example 1. (1st order HPF; fc= 0.70 Hz, 2nd order LPF; fc= 351
kHz, gain= −14.5 dB). The analog signal is able to input through XLR or BNC connectors. (short JP1 and
JP2 for BNC input, open JP1 and JP2 for XLR input). The input level of this circuit is 14.9 Vpp (AK5554:
2.8 Vpp Typ.). When using this circuit, analog characteristics at fs= 48 kHz is DR= 115 dB, S/(N+D)= 106
dB. The S/(N+D) characteristics of the AK5554 varies depending on DC bias current of the input signal.
Set the DC bias voltage in a range from 0.49 x AVDD to 0.51 x AVDD for a better characteristic.
* Film capacitors are recommended for the components shown as 15nF and 1 nF in the figure below.
4.7k
4.7k
Analog In
620
JP1
VP+
Vin- 68µ
+
14.9Vpp
Bias
VP-
1n *
3.3k
10
+
2.8Vpp
AK5554 AINn+
100p
NJM5534
NJM5534
XLR
15n *
VA+
620
10k
Bias
10k
JP2
68µ
-
+
10µ
1n *
3.3k
Vin+
0.1µ
10
+
NJM5534
Bias
VA=+5V
VP=15V
AK5554 AINn100p
2.8Vpp
Figure 76. Input Buffer Example1
fin
1Hz
10Hz
Frequency Response
−1.77dB
−0.02dB
Table 23. Frequency Response of HPF
fin
20kHz
40kHz
80kHz
Frequency Response
0.00dB
0.00dB
0.00dB
Table 24. Frequency Response of LPF
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[AK5554]
14. Package
■ Outline Dimensions
48-pin QFN (Unit mm)
7.00±0.10
0.40±0.10
B
0.23 +0.07
-0.05
0.10
C0
.60
M
AX
5.1
6.75±0.10
7.00±0.10
6.75±0.10
A
0.50
M
AB
5.1
0.85 +0.15
-0.05
+0.03
C
0.08
0.02 -0.02
0.20
C
■ Material & Lead Finish
Package molding compound: Epoxy resin
Lead frame material: Cu
Terminal surface treatment: Solder (Pb free) plate
■ Marking
AKM
AK5554VN
XXXXXXX
1
1)
2)
3)
4)
Pin #1 indication
Date Code: XXXXXXX (7 digits)
Marketing Code: AK5554VN
AKM Logo
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[AK5554]
15. Ordering Guide
−40 - 105 ºC
48-pin QFN
Evaluation Board for AK5554
AK5554VN
AKD5554
16. Revision History
Date (Y/M/D)
16/03/10
20/07/10
Revision
00
01
Reason
Page
First Edition
Error
41-42
Correction
Description 57-58
Added
Contents
TDM128 mode Timing Figure 42-45
“BICK (256fs)” → ”BICK (128fs)”
Precautions when using the 3-wire serial interface
added.
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[AK5554]
IMPORTANT NOTICE
0. Asahi Kasei Microdevices Corporation (“AKM”) reserves the right to make changes to the
information contained in this document without notice. When you consider any use or
application of AKM product stipulated in this document (“Product”), please make inquiries the
sales office of AKM or authorized distributors as to current status of the Products.
1. All information included in this document are provided only to illustrate the operation and
application examples of AKM Products. AKM neither makes warranties or representations with
respect to the accuracy or completeness of the information contained in this document nor
grants any license to any intellectual property rights or any other rights of AKM or any third party
with respect to the information in this document. You are fully responsible for use of such
information contained in this document in your product design or applications. AKM ASSUMES
NO LIABILITY FOR ANY LOSSES INCURRED BY YOU OR THIRD PARTIES ARISING FROM
THE USE OF SUCH INFORMATION IN YOUR PRODUCT DESIGN OR APPLICATIONS.
2. The Product is neither intended nor warranted for use in equipment or systems that require
extraordinarily high levels of quality and/or reliability and/or a malfunction or failure of which may
cause loss of human life, bodily injury, serious property damage or serious public impact,
including but not limited to, equipment used in nuclear facilities, equipment used in the
aerospace industry, medical equipment, equipment used for automobiles, trains, ships and
other transportation, traffic signaling equipment, equipment used to control combustions or
explosions, safety devices, elevators and escalators, devices related to electric power, and
equipment used in finance-related fields. Do not use Product for the above use unless
specifically agreed by AKM in writing.
3. Though AKM works continually to improve the Product’s quality and reliability, you are
responsible for complying with safety standards and for providing adequate designs and
safeguards for your hardware, software and systems which minimize risk and avoid situations in
which a malfunction or failure of the Product could cause loss of human life, bodily injury or
damage to property, including data loss or corruption.
4. Do not use or otherwise make available the Product or related technology or any information
contained in this document for any military purposes, including without limitation, for the design,
development, use, stockpiling or manufacturing of nuclear, chemical, or biological weapons or
missile technology products (mass destruction weapons). When exporting the Products or
related technology or any information contained in this document, you should comply with the
applicable export control laws and regulations and follow the procedures required by such laws
and regulations. The Products and related technology may not be used for or incorporated into
any products or systems whose manufacture, use, or sale is prohibited under any applicable
domestic or foreign laws or regulations.
5. Please contact AKM sales representative for details as to environmental matters such as the
RoHS compatibility of the Product. Please use the Product in compliance with all applicable
laws and regulations that regulate the inclusion or use of controlled substances, including
without limitation, the EU RoHS Directive. AKM assumes no liability for damages or losses
occurring as a result of noncompliance with applicable laws and regulations.
6. Resale of the Product with provisions different from the statement and/or technical features set
forth in this document shall immediately void any warranty granted by AKM for the Product and
shall not create or extend in any manner whatsoever, any liability of AKM.
7. This document may not be reproduced or duplicated, in any form, in whole or in part, without
prior written consent of AKM.
Rev.1
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