TDA7418
3 band car audio processor
Features
•
•
Input multiplexer
– PD/SE4: pseudo differential stereo input,
programmable as single-ended input
– SE1: stereo single-end input
– SE2: stereo single-end input
– SE3: stereo single-end input
– Input gain adjust from 0 to 15dB with 1dB
steps
– Internal offset-cancellation (AutoZero)
Loudness
– Second order frequency response
– Programmable center frequency
(400 Hz / 800 Hz / 2400 Hz)
– 15dB with 1dB steps
– Selectable low and high frequency boost
– Selectable flat-mode (constant attenuation)
•
Volume
– +15dB to -79dB with 1dB step resolution
– Soft-step control with programmable blend
times
•
Bass
– Second order frequency response
– Center frequency programmable in 4 steps
(60 Hz / 80 Hz / 100 Hz / 200 Hz)
– Q programmable 1.0/1.25/1.5/2.0
– DC gain programmable
– -15 to 15dB range with 1dB resolution
•
Middle
– Second order frequency response
– Center frequency programmable in 4 steps
(500 Hz / 1 kHz / 1.5 kHz / 2.5 kHz)
Table 1.
SO20
– Q programmable 0.5/0.75/1.0/1.25
– -15 to 15dB range with 1dB resolution
•
Treble
– Second order frequency response
– Center frequency programmable in 4 steps
(10 kHz / 12.5 kHz / 15 kHz / 17.5 kHz)
– -15 to 15dB range with 1dB resolution
•
Speaker
– 4 independent soft step speaker controls,
+15dB to -79dB with 1dB steps direct mute
•
Subwoofer
– Single-ended mono output
– Independent soft step level control, +15dB
to -79dB with 1dB steps
•
Mute functions
– Direct mute
– Digitally controlled SoftMute with 3
programmable mute-times
(0.48 ms / 0.96 ms /123 ms)
Description
The TDA7418 includes a high performance audio
processor with fully integrated 3-Band filters to
process signals at audible frequencies. The digital
control allows a full programming of the
audioprocessor and filters characteristics.
Device summary
Order code
Temp range, C
Package
Packing
TDA7418
-40 to +85
SO20
Tube
TDA7418TR
-40 to +85
SO20
Tape and reel
September 2013
Rev 4
1/29
www.st.com
1
Contents
TDA7418
Contents
1
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
4
2.1
Connection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2
Pin list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Description of the audioprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1
Input stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2
AutoZero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.3
Loudness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3.2
Peak frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3.3
Low and high frequency boost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.3.4
Flat mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.4
SoftMute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.5
SoftStep volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.6
Bass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.7
4.8
4.9
2/29
4.3.1
4.6.1
Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.6.2
Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.6.3
Quality factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.6.4
DC mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Middle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.7.1
Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.7.2
Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.7.3
Quality factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Treble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.8.1
Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.8.2
Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Speaker attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
TDA7418
5
Contents
4.10
Subwoofer attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.11
MUX output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.12
Audioprocessor testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
I2C bus specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1
Interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1.1
Receive mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1.2
Transmission mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1.3
Reset condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.2
Subaddress (receive mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.3
Data byte specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3/29
List of tables
TDA7418
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Table 12.
Table 13.
Table 14.
Table 15.
Table 16.
4/29
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Pin list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Registers of all subaddresses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Subaddress (receive mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Input selector /gain (0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Loudness (1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Volume / speaker attenuation (2,7,8,9,10,11). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Treble filter (3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Middle filter (4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Bass filter (5). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Middle / bass Fc select (6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Soft mute and soft step time (12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Testing audio processor (13) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
TDA7418
List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pin out. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Loudness attenuation @ fC = 400Hz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Loudness center frequencies @ Attn. = 15dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Loudness attenuation, fc = 2.4kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Softmute timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
SoftStep timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Bass control @ fC = 80Hz, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Bass center frequencies @ Gain = 15dB, Q = 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Bass quality factors @ Gain = 14dB, fC = 80Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Bass normal and DC mode @ Gain = 14dB, fC = 80Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Middle control @ fC = 1 kHz, Q = 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Middle center frequencies @ Gain = 14dB, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Bass quality factors @ Gain = 14dB, fC = 1kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Treble control @ fC = 17.5 kHz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Treble center frequencies @ Gain = 14dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
MUX output configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
SO20 mechanical data and package dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5/29
6/29
7
8
9
5
6
3
4
1
2
DIFFG
DIFFR
SE1L
SE1R
SE2L
SE2R
SE3L
SE3R
INPUT
MULTIPLEXER
3
6
VDD GND CREF
7
SUPPLY
InGain
AutoZero
+
Loudness
SoftMute
2
19
I CBUS
Middle
SCL SDA
18
Treble
DIGITAL CONTROL
Softstep
Volume
Bass
MIX
Softstep
Mono Fader
Softstep
Mono Fader
Softstep
Mono Fader
Softstep
Mono Fader
Softstep
Mono Fader
AC00057
12
14
15
13
16
OUTSW
OUTRR
OUTLR
OUTRF
OUTLF
Figure 1.
DIFFL
1
17
MUTE/MUXOUT
Block diagram
TDA7418
Block diagram
Block diagram
TDA7418
Pin description
2
Pin description
2.1
Connection diagram
Figure 2.
Pin out
SE3L
1
20
VDD
SE3R
2
19
SDA
SE2L
3
18
SCL
SE2R
4
17
MUTE/MUXOUT
SE1L
5
16
OUTLF
SE1R
6
15
OUTLR
DIFFL
7
14
OUTRR
DIFFG
8
13
OUTRF
DIFFR
9
12
OUTSW
CREF
10
11
GND
AC00058
2.2
Pin list
Table 2.
No.
Pin list
Pin Name
Description
I/O
1
SE3L
Single-ended input 3 left channel
I
2
SE3R
Single-ended input 3 right channel
I
3
SE2L
Single-ended input 2 left channel
I
4
SE2R
Single-ended input 2 right channel
I
5
SE1L
Single-ended input 1 left channel
I
6
SE1R
Single-ended input 1 Right channel
I
7
DIFFL
Pseudo differential stereo input left
I
8
DIFFG
Pseudo differential stereo input common
I
9
DIFFR
Pseudo differential stereo input right
I
10
CREF
Reference capacitor
O
11
GND
Ground
S
12
OUTSW
Subwoofer output
O
13
OUTRF
Front right output
O
14
OUTRR
Rear right output
O
15
OUTLR
Rear left output
O
16
OUTLF
Front left output
O
17
MUTE / MUXOUT
External mute pin / MUX output
I
18
SCL
I2C bus clock
I
2
19
SDA
I C bus data
20
VDD
Supply
I/O
S
7/29
Electrical specification
TDA7418
3
Electrical specification
3.1
Absolute maximum ratings
Table 3.
Absolute maximum ratings
Symbol
Parameter
Value
Unit
(1)
-0.4 to 10.2
-0.4 to VCC + 0.4
V
Supply voltage for VCC
VS
for other pins
Top
Operating temperature range
-40 to +85
°C
Tstg
Storage temperature
-55 to +150
°C
VESD
ESD protection (Human Body Model)
±2000
V
VESD
ESD protection (Machine Model)
±200
V
VESD
ESD protection (Change Device Model)
±750
V
1. Reference level is GND.
3.2
Electrical characteristics
Table 4.
Electrical characteristics
VS = 8.5 V; Tamb= 25 °C; RL= 10 k; all gains = 0 dB; f = 1 kHz; unless otherwise specified
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
Supply
VS
Supply voltage
8
8.5
10
V
IS
Supply current
18
25
32
mA
70
100
130
k
Input selector
Rin
Input resistance
All single ended inputs
VCL
Clipping level
1.8
2
VRMS
SIN
Input separation
80
100
dB
GIN MIN
Min. input gain
-0.5
0
0.5
dB
GIN MAX
Max. input gain
14
15
16
dB
GSTEP
Step resolution
0.5
1
1.5
dB
Adjacent gain steps
-5
1
5
mV
GMIN to GMAX
-30
4
30
mV
VDC
Voffset
DC steps
Remaining offset with AutoZero
0.5
mV
Differential stereo inputs
Rin
CMRR
8/29
Input resistance
Common mode rejection ratio
Differential
70
100
130
k
VCM=1 VRMS@ 1kHz
40
60
dB
VCM=1 VRMS@ 10kHz
40
60
dB
TDA7418
Table 4.
Electrical specification
Electrical characteristics (continued)
VS = 8.5 V; Tamb= 25 °C; RL= 10 k; all gains = 0 dB; f = 1 kHz; unless otherwise specified
Symbol
Parameter
eNo
Output noise @ speaker outputs
Test condition
Min.
20Hz-20kHz,flat;
all stages 0dB
Typ.
Max.
Unit
12
20
V
Loudness control
AMAX
Max. attenuation
-16
-15
-14
dB
ASTEP
Step resolution
0.5
1
1.5
dB
fP1
360
400
440
Hz
fP2
720
800
880
Hz
fP4
2.1
2.4
2.7
kHz
fPeak
Peak frequency
(1)
Volume control
GMAX
Max. gain
14
15
16
dB
AMAX
Max. attenuation
-84
-79
-74
dB
ASTEP
Step resolution
0.5
1
1.5
dB
G = -20 to +15dB
-1
0
1
dB
G = -79 to -20dB
-4
0
3
dB
2
dB
EA
Attenuation set error
ET
Tracking error
VDC
DC steps
Adjacent Attenuation Steps
-3
0.1
3
mV
From 0dB to GMIN
-10
0.5
10
mV
80
100
dB
T1
0.48
ms
T2
0.96
ms
T3
123
ms
Soft mute
AMUTE
TD
Mute attenuation
Delay time
VTH Low
Low threshold for SM pin
VTH High
High threshold for SM pin
2.7
RPU
Internal pull-up resistor
32
VPU
Internal pull-up voltage
0.7
V
V
45
58
3.3
k
V
Bass control
fc
Center frequency (1)
fC1
54
60
66
Hz
fC2
72
80
88
Hz
fC3
90
100
110
Hz
fC4
180
200
220
Hz
9/29
Electrical specification
Table 4.
Electrical characteristics (continued)
VS = 8.5 V; Tamb= 25 °C; RL= 10 k; all gains = 0 dB; f = 1 kHz; unless otherwise specified
Symbol
QBASS
TDA7418
Parameter
Quality factor (1)
Test condition
Min.
Typ.
Max.
Q1
0.9
1
1.1
Q2
1.1
1.25
1.4
Q3
1.3
1.5
1.7
Q4
1.8
2
2.2
Unit
CRANGE
Control range
14
15
16
dB
ASTEP
Step resolution
0.5
1
1.5
dB
DCGAIN
Bass-DC-gain
DC = off
DC = on
0
dB
3.5
4.4
6
dB
Middle control
CRANGE
Control range
14
15
16
dB
ASTEP
Step resolution
0.5
1
1.5
dB
fC1
400
500
600
Hz
fC2
0.8
1
1.2
kHz
fC3
1.2
1.5
1.8
kHz
fC4
2
2.5
3
kHz
Q1
0.45
0.5
0.55
Q2
0.65
0.75
0.85
Q3
0.9
1
1.1
Q4
1.1
1.25
1.4
Clipping level
14
15
16
dB
Step resolution
0.5
1
1.5
dB
fC1
8
10
12
kHz
fC2
10
12.5
15
kHz
fC3
12
15
18
kHz
fC4
14
17.5
21
kHz
Center frequency (1)
fc
QBASS
Quality factor (1)
Treble control
CRANGE
ASTEP
fc
Center frequency (1)
Speaker attenuator
GMAX
Max. gain
14
15
16
dB
AMAX
Max. attenuation
-84
-79
-74
dB
ASTEP
Step resolution
0.5
1
1.5
dB
AMUTE
Mute attenuation
80
90
EE
VDC
10/29
Attenuation set error
DC steps
Adjacent attenuation steps
-5
0.1
dB
2
dB
5
mV
TDA7418
Table 4.
Electrical specification
Electrical characteristics (continued)
VS = 8.5 V; Tamb= 25 °C; RL= 10 k; all gains = 0 dB; f = 1 kHz; unless otherwise specified
Symbol
Parameter
Test condition
Min.
Typ.
1.8
2
Max.
Unit
Audio outputs
VCL
ROUT
Clipping level
Output impedance
RL
Output load resistance
CL
Output load capacitor
VDC
d = 0.3%
30
VRMS
100
2
DC voltage level
k
10
nF
3.8
4.0
4.2
V
Subwoofer attenuator
GMAX
Max. gain
14
15
16
dB
AMAX
Max. attenuation
-84
-79
-74
dB
ASTEP
Step resolution
0.5
1
1.5
dB
AMUTE
Mute attenuation
80
90
EE
VDC
Attenuation set error
-5
dB
2
dB
0.1
5
mV
20
V
DC steps
Adjacent attenuation steps
eNO
Output noise
BW=20Hz to 20 kHz all gain =
0dB
12
S/N
Signal to noise ratio
all gain = 0dB flat; Vo=2VRMS
100
D
Distortion
VIN=1VRMS; all stages 0dB
SC
Channel separation left/right
General
0.005
80
dB
0.100
90
%
dB
1. Min. and max. values are calculated according to simulation results; functionality is guaranteed by measuring a directly
correlated parameter.
11/29
Description of the audioprocessor
TDA7418
4
Description of the audioprocessor
4.1
Input stages
In the basic configuration, one stereo pseudo differential (programmable as single-ended
input) and three single-ended stereo inputs are available.
Pseudo differential stereo input (PD/SE4)
The PD input is implemented as a buffered pseudo differential stereo stage with 100k
input-impedance at each input. The attenuation is fixed to -3dB in order to adapt the
incoming signal level. It is also configurable as single-ended input.
Single-ended stereo input (SE1, SE2, SE3)
The input-impedance at each input is 100k and the attenuation is fixed to -3dB for
incoming signals.
Figure 3.
Input stage
QD_L/SE4_L
QD_G
QD_R/SE4_R
QD/SE4
QD/SE4
Input
Selector
In Gain
SE1_L
SE1_R
SE2_L
SE2_R
SE3_L
SE3_R
4.2
SE1
SE1
SE2
SE2
SE3
SE3
AutoZero
The AutoZero allows a reduction of the number of pins as well as external components by
canceling any offset generated by or before the In-Gain-stage (Please notice that externally
generated offsets, e.g. generated through the leakage current of the coupling capacitors,
are not canceled).
The auto-zeroing is started every time the input source is changed and needs max. 0.6ms
for the alignment. To avoid audible clicks the Audio processor is muted before the loudness
stage during this time.
AutoZero-remain
In some cases, for example if the µP is executing a refresh cycle of the IIC-Busprogramming, it is not useful to start a new AutoZero-action because no new source is
12/29
TDA7418
Description of the audioprocessor
selected and an undesired mute would appear at the outputs. For such applications, it can
be switched in the AutoZero-Remain-Mode (Bit 6 of the subaddress-byte). If this bit is set to
high, the AutoZero will not be invoked and the old adjustment-value remains.
4.3
Loudness
There are four parameters programmable in the loudness stage:
4.3.1
Attenuation
Figure 4 shows the attenuation as a function of frequency at fC = 400Hz
Figure 4.
4.3.2
Loudness attenuation @ fC = 400Hz.
Peak frequency
Figure 5 shows the four possible peak-frequencies at 400, 800 and 2400Hz
Figure 5.
Loudness center frequencies @ Attn. = 15dB
13/29
Description of the audioprocessor
4.3.3
TDA7418
Low and high frequency boost
Figure 6 shows the different Loudness shapes in low & high frequency boost.
Figure 6.
4.3.4
Loudness attenuation, fc = 2.4kHz
Flat mode
In flat mode the loudness stage works as a 0dB to -15dB attenuator.
4.4
SoftMute
The digitally controlled SoftMute stage allows muting/demuting the signal with a I2C-bus
programmable slope. The mute process can either be activated by the SoftMute pin or by
the I2C-bus. This slope is realized in a special S-shaped curve to mute slow in the critical
regions (see Figure 7).
For timing purposes the Bit0 of the I2C-bus output register is set to 1 from the start of muting
until the end of demuting.
Figure 7.
Softmute timing
EXT.
MUTE
1
+SIGNAL
REF
-SIGNAL
1
2
I C BUS
OUT
D97AU634
Time
1. Please notice that a started Mute-action is always terminated and could not be interrupted by a change of
the mute-signal
14/29
TDA7418
4.5
Description of the audioprocessor
SoftStep volume
When the volume-level is changed audible clicks could appear at the output. The root cause
of those clicks
could either be a DC-Offset before the volume-stage or the sudden change of the envelope
of the audio signal. With the SoftStep-feature both kinds of clicks could be reduced to a
minimum and are no more audible.
Eight programmable softstep time from one step to the next are user selectable.
Figure 8.
SoftStep timing
VOUT
1dB
0.5dB
Time
SS Time
-0.5dB
-1dB
D00AU1170
1. For steps more than 1dB the SoftStep mode should be deactivated because it could generate 1dB error
step during the blend-time.
4.6
Bass
There are four parameters programmable in the bass stage:
4.6.1
Attenuation
Figure 9 shows the attenuation as a function of frequency at a center frequency of 80Hz.
Figure 9.
Bass control @ fC = 80Hz, Q = 1
15/29
Description of the audioprocessor
4.6.2
TDA7418
Center frequency
Figure 10 shows the four possible center frequencies 60, 80, 100 and 200Hz.
Figure 10. Bass center frequencies @ Gain = 15dB, Q = 1
4.6.3
Quality factors
Figure 11 shows the four possible quality factors 1, 1.25, 1.5 and 2.
Figure 11.
4.6.4
Bass quality factors @ Gain = 14dB, fC = 80Hz
DC mode
In this mode the DC-gain is increased by 4.4dB. In addition the programmed center
frequency and quality factor is decreased by 25% which can be used to reach alternative
center frequencies or quality factors.
Figure 12. Bass normal and DC mode @ Gain = 14dB, fC = 80Hz
1. The center frequency, Q and DC-mode can be set fully independently.
16/29
TDA7418
4.7
Description of the audioprocessor
Middle
There are three parameters programmable in the middle stage:
4.7.1
Attenuation
Figure 13 shows the attenuation as a function of frequency at a center frequency of 1kHz.
Figure 13. Middle control @ fC = 1 kHz, Q = 1
4.7.2
Center frequency
Figure 14 shows the four possible center frequencies 500Hz, 1kHz, 1.5kHz and 2.5kHz.
Figure 14. Middle center frequencies @ Gain = 14dB, Q = 1
4.7.3
Quality factors
Figure 15 shows the four possible quality factors 0.5, 0.75, 1 and 1.5.
Figure 15. Bass quality factors @ Gain = 14dB, fC = 1kHz
17/29
Description of the audioprocessor
4.8
TDA7418
Treble
There are two parameters programmable in the treble stage:
4.8.1
Attenuation
Figure 16 shows the attenuation as a function of frequency at a center frequency of
17.5kHz.
Figure 16. Treble control @ fC = 17.5 kHz
4.8.2
Center frequency
Figure 17 shows the four possible center frequencies 10k, 12.5k, 15k and 17.5kHz.
Figure 17. Treble center frequencies @ Gain = 14dB
4.9
Speaker attenuator
The four speakers have independent soft step speaker controls. And their attenuators can
be adjusted from +15dB to -79dB with 1dB steps.
4.10
Subwoofer attenuator
The Subwoofer output is a single ended mono output. The attenuator is exactly the same
like the other speakers.
18/29
TDA7418
4.11
Description of the audioprocessor
MUX output
It provides a mono signal output (before tone filters) at Mute/MUX pin, used for external
level meter / spectrum analyzer.
The mute pin can be configured as MUX output (I2C Byte13_D7D1). When it is configured
as MUX output, the output voltage is (InGainL+InGainR)/2 with -3dB attenuation.
Figure 18. MUX output configuration
InGainL
+
MUTE/MUX = (InGainL+InGainR)/2 * (-3dB)
AC00059
InGainR
4.12
Audioprocessor testing
In the test mode, which can be activated by setting bit D7 of the IIC subaddress byte and bit
D0 of the testing audioprocessor byte, several internal signals are available at the SE2R pin.
In this mode, the input resistance of 100kOhm is disconnected from the pin. Internal signals
available for testing are listed in the data-byte specification.
19/29
I2C bus specification
TDA7418
5
I2C bus specification
5.1
Interface protocol
The interface protocol comprises:
–
5.1.1
S
a start condition (S)
–
a chip address byte (the LSB determines read/write transmission)
–
a subaddress byte
–
a sequence of data (N-bytes + acknowledge)
–
a stop condition (P)
–
the max. clock speed is 500kbits/s
Receive mode
1
0
0 0 1
S=
0
0
R/W
ACK
TS
AZ
AI
A4
A3
A2
A1
A0
ACK
DATA
ACK
P
Start
R/W = "0" -> Receive Mode (Chip can be programmed by P)
"1" -> Transmission Mode (Data could be received by P)
ACK = Acknowledge
P=
Stop
TS = Testing mode
AZ = Auto zero remain
AI =
5.1.2
S
Auto increment
Transmission mode
1
0
0
0
1
0
0
R/W
ACK
X
X
X
X
X
X
X
SM
ACK
P
SM = Soft mute activated for main channel
X = Not Used
The transmitted data is automatic updated after each ACK. Transmission can be repeated
without new chip address.
5.1.3
Reset condition
A Power-On-Reset is invoked if the Supply-Voltage is below than 2.5V. After that the
following data is written automatically into the registers of all subaddresses:
Table 5.
Registers of all subaddresses
MSB
1
20/29
LSB
1
1
1
1
1
1
0
I2C bus specification
TDA7418
5.2
Subaddress (receive mode)
Table 6.
Subaddress (receive mode)
MSB
LSB
Function
I2
I1
I0
A4
A3
A2
A1
A0
Testing Mode
Off
On
0
1
Auto Zero Remain
Off
On
0
1
Auto Increment Mode
Off
On
0
1
0
0
0
0
0
Main Source Selector
0
0
0
0
1
Loudness
0
0
0
1
0
Volume
0
0
0
1
1
Treble
0
0
1
0
0
Middle
0
0
1
0
1
Bass
0
0
1
1
0
Middle/ Bass Fc Select
0
0
1
1
1
Speaker Attenuator Left Front
0
1
0
0
0
Speaker Attenuator Left Rear
0
1
0
0
1
Speaker Attenuator Right Rear
0
1
0
1
0
Speaker Attenuator Right Front
0
1
0
1
1
Subwoofer Attenuator
0
1
1
0
0
Soft Mute / Soft Step
0
1
1
0
1
Testing Audio Processor
21/29
I2C bus specification
5.3
TDA7418
Data byte specification
Table 7.
Input selector /gain (0)
MSB
LSB
Function
D7
D6
0
0
:
1
1
D5
0
0
:
1
1
D4
0
0
:
1
1
D3
D2
D1
D0
0
0
0
0
1
0
0
1
1
X
0
1
0
1
X
Source Selector
PD/SE4
SE1
SE2
SE3
mute
Input Gain
0dB
1dB
:
14dB
15dB
0
1
:
0
1
Diffin Mode
Single Ended Stereo
Differential Stereo
0
1
Table 8.
Loudness (1)
MSB
LSB
Function
D7
D6
0
0
1
0
1
22/29
D5
0
0
1
1
D4
0
1
0
1
D3
D2
D1
D0
0
0
:
1
1
0
0
:
1
1
0
0
:
1
1
0
1
:
0
1
Attenuation
0dB
-1dB
:
-14dB
-15dB
Filter/Center Frequency
Off (Flat) D6 must be = 0
400Hz
800Hz
2400Hz
Shape
Low Boost
Low & HighBoost
Loudness Soft Step
on
off
I2C bus specification
TDA7418
Table 9.
Volume / speaker attenuation (2,7,8,9,10,11)
MSB
LSB
Function
D7
D6
D5
D4
D3
D2
D1
D0
0
0
:
0
0
0
0
:
0
0
:
1
1
1
0
0
:
0
0
0
0
:
0
1
:
0
0
1
0
0
:
0
0
1
1
:
1
0
:
1
1
x
1
1
:
0
0
0
0
:
1
0
:
1
1
x
1
1
:
0
0
0
0
:
1
0
:
1
1
x
1
1
:
0
0
0
0
:
1
0
:
1
1
x
1
0
:
1
0
0
1
:
1
0
:
0
1
x
Gain/Attenuation
+15dB
+14dB
:
+1dB
0dB
0dB
-1dB
:
-15dB
-16dB
:
-78dB
-79dB
Mute
Volume Soft Step
on
off
0
1
Table 10.
Treble filter (3)
MSB
LSB
Function
D7
D6
D5
D4
0
0
:
0
0
1
1
:
1
1
0
0
1
1
1
0
1
0
1
D3
0
0
:
1
1
1
1
:
0
0
D2
0
0
:
1
1
1
1
:
0
0
D1
0
0
:
1
1
1
1
:
0
0
D0
0
1
:
0
1
1
0
:
1
0
Gain/Attenuation
-15dB
-14dB
:
-1dB
0dB
0dB
+1dB
:
+14dB
+15dB
Treble Center Frequency
10.0kHz
12.5kHz
15.0kHz
17.5kHz
Must be “1”
23/29
I2C bus specification
TDA7418
Table 11.
Middle filter (4)
MSB
LSB
Function
D7
D6
0
0
1
1
0
1
24/29
D5
0
1
0
1
D4
D3
D2
D1
D0
0
0
:
0
0
1
1
:
1
1
0
0
:
1
1
1
1
:
0
0
0
0
:
1
1
1
1
:
0
0
0
0
:
1
1
1
1
:
0
0
0
1
:
0
1
1
0
:
1
0
Gain/Attenuation
-15dB
-14dB
:
-1dB
0dB
0dB
+1dB
:
+14dB
+15dB
Middle Q Factor
0.5
0.75
1
1.25
Middle Soft Step
on
off
I2C bus specification
TDA7418
Table 12.
Bass filter (5)
MSB
LSB
Function
D7
D6
0
0
1
1
D5
D4
D3
D2
D1
D0
0
0
:
0
0
1
1
:
1
1
0
0
:
1
1
1
1
:
0
0
0
0
:
1
1
1
1
:
0
0
0
0
:
1
1
1
1
:
0
0
0
1
:
0
1
1
0
:
1
0
Gain/Attenuation
-15dB
-14dB
:
-1dB
0dB
0dB
+1dB
:
+14dB
+15dB
Bass Q Factor
1.0
1.25
1.5
2.0
0
1
0
1
Bass Soft Step
on
off
0
1
Table 13.
Middle / bass Fc select (6)
MSB
LSB
Function
D7
D6
D5
D4
D3
0
0
1
1
0
1
0
1
X
X
D2
0
1
0
1
D1
D0
0
0
1
1
0
1
0
1
Middle Center Frequency
500Hz
1kHz
1.5kHz
2.5kHz
Bass Center Frequency
60Hz
80Hz
100Hz
200Hz
Bass DC Mode
off
on
Smoothing Filter
off
on
Not used
25/29
I2C bus specification
TDA7418
Table 14.
Soft mute and soft step time (12)
MSB
D7
LSB
D6
D5
D4
D3
D2
D1
D0
0
1
0
0
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
X
0
1
0
1
0
1
0
1
0
1
X
Table 15.
LSB
D6
D5
D4
D3
D2
D1
D0
0
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
x
0
1
0
1
1
26/29
Soft Mute
on
off
Soft Mute Time
0.48ms
0.96ms
123ms
Soft Step Time
0.16ms
0.32ms
0. 64ms
1.28ms
2.56ms
5.12ms
10.24ms
20.48ms
AZ function
off
on
Not used
Testing audio processor (13)
MSB
D7
Function
x
0
1
Function
Audio Processor Testing Mode
off
on
Test Multiplexer
InMuxOutR
LoudOutR
VolumeOutR
VBG1.26
REF5V5
SSCLK
SMCLK
Clk200kHz
Not Used
Schlock
Normal
Fast Mode
MUTE Pin Config.
MUX output
External clock
Mute (normal)
TDA7418
6
Package information
Package information
In order to meet environmental requirements, ST (also) offers these devices in ECOPACK®
packages. ECOPACK® packages are lead-free. The category of second Level Interconnect
is marked on the package and on the inner box label, in compliance with JEDEC Standard
JESD97. The maximum ratings related to soldering conditions are also marked on the inner
box label.
ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.
Figure 19. SO20 mechanical data and package dimensions
mm
inch
DIM.
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
A
2.35
2.65
0.093
0.104
A1
0.10
0.30
0.004
0.012
B
0.33
0.51
0.013
0.200
C
0.23
0.32
0.009
0.013
12.60
13.00
0.496
0.512
7.40
7.60
0.291
0.299
D
(1)
E
e
1.27
0.050
H
10.0
10.65
0.394
0.419
h
0.25
0.75
0.010
0.030
L
0.40
1.27
0.016
0.050
k
ddd
OUTLINE AND
MECHANICAL DATA
0˚ (min.), 8˚ (max.)
0.10
0.004
(1) “D” dimension does not include mold flash, protusions or gate
burrs. Mold flash, protusions or gate burrs shall not exceed
0.15mm per side.
SO20
0016022 D
27/29
Revision history
7
TDA7418
Revision history
Table 16.
28/29
Document revision history
Date
Revision
Changes
15-Feb-2007
1
Initial release.
23-Oct-2008
2
Updated Table 6: Subaddress (receive mode) on page 21.
03-Nov-2008
3
Corrected Table 6: Subaddress (receive mode) on page 21.
23-Sep-2013
4
Updated Disclaimer.
TDA7418
Please Read Carefully:
Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the
right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any
time, without notice.
All ST products are sold pursuant to ST’s terms and conditions of sale.
Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no
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No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this
document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products
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third party products or services or any intellectual property contained therein.
UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED
WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS
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SUPPORTING, ACTIVE IMPLANTED DEVICES OR SYSTEMS WITH PRODUCT FUNCTIONAL SAFETY REQUIREMENTS; (B)
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Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void
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29/29
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