Not Recommended for New Designs
PCM2903B
Burr-Brown Audio
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SLES228 – DECEMBER 2008
STEREO AUDIO CODEC WITH USB INTERFACE,
SINGLE-ENDED ANALOG INPUT/OUTPUT, AND S/PDIF
Check for Samples: PCM2903B
FEATURES
1
• On-Chip USB Interface:
– With Full-Speed Transceivers
– Fully Compliant with USB 2.0 Specification
– Certified by USB-IF
– Partially Programmable Descriptors (1)
– USB Adaptive Mode for Playback
– USB Asynchronous Mode for Record
– Self-Powered
• 16-Bit Delta-Sigma ADC and DAC
• Sampling Rates:
– DAC: 32, 44.1, 48 kHz
– ADC: 8, 11.025, 16, 22.05, 32, 44.1, 48 kHz
• On-Chip Clock Generator With Single 12-MHz
Clock Source
• S/PDIF Input/Output
• Single Power Supply:
– 3.3 V Typical
• Stereo ADC:
– Analog Performance at VCCC = VCCP1 = VCCP2
= VCCX = VDD = 3.3 V:
– THD+N = 0.01%
– SNR = 89 dB
– Dynamic Range = 89 dB
– Decimation Digital Filter:
– Passband Ripple = ±0.05 dB
– Stop-Band Attenuation = –65 dB
– Single-Ended Voltage Input
– Antialiasing Filter Included
– Digital HPF Included
•
234
(1)
The descriptor can be modified by changing a mask.
•
•
Stereo DAC:
– Analog Performance at VCCC = VCCP1 = VCCP2
= VCCX = VDD = 3.3 V:
– THD+N = 0.005%
– SNR = 96 dB
– Dynamic Range = 93 dB
– Oversampling Digital Filter:
– Passband Ripple = ±0.1 dB
– Stop-Band Attenuation = –43 dB
– Single-Ended Voltage Output
– Analog LPF Included
Multifunctions:
– Human Interface Device (HID) Function:
– Volume and and Mute Controls
– Suspend Flag Function
28-Pin SSOP Package
APPLICATIONS
•
•
•
•
USB Audio Speaker
USB Headset
USB Monitor
USB Audio Interface Box
DESCRIPTION
The PCM2903B is Texas Instruments' single-chip,
USB, stereo audio codec with a USB-compliant fullspeed protocol controller and S/PDIF. The USB
protocol controller requires no software code, but the
USB descriptors can be modified in some areas (for
example, vendor ID and/or product ID). The
PCM2903B employs SpAct™ architecture, TI's
unique system that recovers the audio clock from
USB packet data. On-chip analog PLLs with SpAct
enable playback and record with low clock jitter as
well as independent playback and record sampling
rates.
1
2
3
4
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
SpAct is a trademark of Texas Instruments.
System Two, Audio Precision are trademarks of Audio Precision, Inc.
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008, Texas Instruments Incorporated
Not Recommended for New Designs
PCM2903B
SLES228 – DECEMBER 2008
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
PACKAGE/ORDERING INFORMATION (1)
(1)
PRODUCT
PACKAGE-LEAD
PACKAGE
DESIGNATOR
PCM2903BDB
SSOP-28
DB
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
MARKING
–25°C to 85°C
PCM2903B
ORDERING
NUMBER
TRANSPORT
MEDIA,
QUANTITY
PCM2903BDB
Rails, 47
PCM2903BDBR
Tape and Reel,
2000
For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
ABSOLUTE MAXIMUM RATINGS (1)
Over operating free-air temperature range (unless otherwise noted).
PARAMETER
Supply voltage, VCCC, VCCP1, VCCP2, VCCX, VDD
PCM2903B
UNIT
–0.3 to 4
V
Supply voltage differences, VCCC, VCCP1, VCCP2, VCCX, VDD
±0.1
V
Ground voltage differences, AGNDC, AGNDP, AGNDX, DGND, DGNDU
±0.1
V
–0.3 to 6.5
V
–0.3 to (VDD + 0.3) < 4
V
Digital input voltage
SEL0, SEL1, DIN
D+, D–, HID0, HID1, HID2, XTI, XTO, DOUT, SSPND
Analog input voltage VINL, VINR, VCOM, VOUTR, VOUTL
–0.3 to (VCCC + 0.3) < 4
V
±10
mA
Ambient temperature under bias
–40 to +125
°C
Storage temperature, Tstg
–55 to +150
°C
Junction temperature TJ
+150
°C
Lead temperature (soldering, 5s)
+260
°C
Package temperature (IR reflow, peak)
+250
°C
Input current (any pins except supplies)
(1)
2
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under is not implied. Exposure to
absolute-maximum-rated conditions for extended periods may affect device reliability.
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SLES228 – DECEMBER 2008
ELECTRICAL CHARACTERISTICS
All specifications at TA = +25°C, VCCC = VCCP1 = VCCP2 = VCCX = VDD = 3.3 V, fS = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless
otherwise noted.
PCM2903B
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
DIGITAL INPUT/OUTPUT
Host interface
Apply USB Revision 2.0, full speed
Audio data format
USB isochronous data format
INPUT LOGIC
D+, D–
VIH
High-level input
voltage
XTI, HID0, HID1, and
HID2
SEL0, SEL1
DIN
2
VDD
0.7 VDD
VDD
2
5.25
0.7 VDD
5.25
D+, D–
VIL
Low-level input
voltage
0.8
XTI, HID0, HID1, and
HID2
0.3 VDD
SEL0, SEL1
IIH
IIL
Low-level input
current
D+, D–, XTI, SEL0,
SEL1
VDC
0.8
DIN
High-level input
current
VDC
0.3 VDD
VIN = 3.3 V
±10
HID0, HID1, and HID2 VIN = 3.3 V
50
80
DIN
VIN = 3.3 V
65
100
D+, D–, XTI, SEL0,
SEL1
VIN = 0 V
±10
HID0, HID1, and HID2 VIN = 0 V
±10
DIN
±10
VIN = 0 V
μA
μA
OUTPUT LOGIC
VOH
D+, D–
High-level output
DOUT
voltage
SSPND
2.8
IOH = –4 mA
2.8
IOH = –2 mA
2.8
VDC
D+, D–
VOL
Low-level output
voltage
0.3
DOUT
IOL = 4 mA
0.5
SSPND
IOL = 2 mA
0.5
VDC
CLOCK FREQUENCY
Input clock frequency, XTI
11.994
12
12.006
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3
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PCM2903B
SLES228 – DECEMBER 2008
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ELECTRICAL CHARACTERISTICS (continued)
All specifications at TA = +25°C, VCCC = VCCP1 = VCCP2 = VCCX = VDD = 3.3 V, fS = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless
otherwise noted.
PCM2903B
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ADC CHARACTERISTICS
Resolution
Audio data channel
8, 16
Bits
1, 2
Channel
ADC Clock Frequency
fS
Sampling frequencies
8, 11.025, 16, 22.05, 32, 44.1, 48
kHz
ADC DC Accuracy
Gain mismatch, channel-to-channel
±1
±5
% of
FSR
Gain error
±2
±10
% of
FSR
Bipolar zero error
±0
% of
FSR
ADC Dynamic Performance (1)
THD+N
SNR
Total harmonic distortion plus noise
VIN = –1 dB
0.01
VIN = –60 dB
0.02
%
5
%
Dynamic range
A-weighted
81
89
dB
Signal-to-noise ratio
A-weighted
81
89
dB
80
85
dB
Input voltage
0.6 VCCC
VPP
Center voltage
0.5 VCCC
V
Channel separation
Analog Input
Input impedance
Antialising filter frequency response
–3 dB
fIN = 20 kHz
30
kΩ
150
kHz
–0.08
dB
ADC Digital Filter Performance
Passband
0.454 fS
Stop band
0.583 fS
Hz
Passband ripple
±0.05
Stop-band attenuation
td
HPF frequency response
(1)
4
–65
Delay time
dB
dB
17.4/fS
–3 dB
Hz
0.078 fS/1000
s
Hz
fIN = 1 kHz, using a System Two™ audio measurement system by Audio Precision™ in RMS mode with a 20-kHz LPF and 400-Hz HPF
in the calculation.
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SLES228 – DECEMBER 2008
ELECTRICAL CHARACTERISTICS (continued)
All specifications at TA = +25°C, VCCC = VCCP1 = VCCP2 = VCCX = VDD = 3.3 V, fS = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless
otherwise noted.
PCM2903B
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
DAC CHARACTERISTICS
Resolution
Audio data channel
8, 16
Bits
1, 2
Channel
DAC Clock Frequency
fS
Sampling frequencies
32, 44.1, 48
kHz
DAC DC Accuracy
Gain mismatch channel-to-channel
±1
±5
% of
FSR
Gain error
±2
±10
% of
FSR
Bipolar zero error
±2
% of
FSR
DAC Dynamic Performance (2)
THD+N
SNR
Total harmonic distortion plus noise
VOUT = 0 dB
0.005
VOUT = –60 dB
0.016
%
3
%
Dynamic range
EIAJ, A-weighted
87
93
dB
Signal-to-noise ratio
EIAJ, A-weighted
90
96
dB
86
92
dB
Output voltage
0.6 VCCC
VPP
Center voltage
0.5 VCCC
V
Channel separation
Analog Output
VO
Load impedance
LPF frequency response
AC coupling
10
–3 dB
f = 20 kHz
kΩ
250
kHz
–0.03
dB
DAC Digital Filter Performance
Passband
0.445 fS
Stop band
0.555 fS
Hz
Passband ripple
±0.1
Stop-band attenuation
td
–43
Delay time
Hz
dB
dB
14.3/fS
s
POWER-SUPPLY REQUIREMENTS
VDD,
VCCC,
VCCP1,
VCCP2,
VCCX
Voltage range
Supply current
PD
Power dissipation
3
ADC, DAC operation
Suspend mode (3)
3.3
3.6
VDC
54
70
mA
μA
250
ADC, DAC operation
178
Suspend mode (3)
0.83
252
mW
mW
TEMPERATURE RANGE
Operating temperature range
θJA
(2)
(3)
–25
Thermal resistance
+85
100
°C
°C/W
fOUT = 1 kHz, using a System Two audio measuerment system by Audio Precision in RMS mode with a 20-kHz LPF and 400-Hz HPF.
Under USB suspend state.
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SLES228 – DECEMBER 2008
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PIN ASSIGNMENTS
DB PACKAGE
SSOP-28
(TOP VIEW)
D+
D–
1
2
3
4
5
6
7
8
9
10
11
12
13
14
VBUS
DGNDU
HID0
HID1
HID2
SEL0
SEL1
VCCC
AGNDC
VINL
VINR
VCOM
PCM2903B
28
27
26
25
24
23
22
21
20
19
18
17
16
15
SSPND
VDD
DGND
DOUT
DIN
VCCX
AGNDX
XTI
XTO
VCCP2
AGNDP
VCCP1
VOUTL
VOUTR
P0007-07
Table 1. TERMINAL FUNCTIONS
TERMINAL
NAME
NO.
I/O
AGNDC
11
–
DESCRIPTION
Analog ground for codec
AGNDP
18
–
Analog ground for PLL
AGNDX
22
–
Analog ground for oscillator
D–
2
I/O
USB differential input/output minus (1)
D+
1
I/O
USB differential input/output plus (1)
DGND
26
–
Digital ground
DGNDU
4
–
Digital ground for USB transceiver
DIN
24
I
S/PDIF input
DOUT
25
O
S/PDIF output
HID0
5
I
HID key state input (mute), active-high (3)
HID1
6
I
HID key state input (volume up), active-high (3)
HID2
7
I
HID key state input (volume down), active-high (3)
SEL0
8
I
Must be set to high (4)
SEL1
9
I
Connected to the USB port of VBUS
SSPND
28
O
Suspend flag, active-low (Low: suspend, High: operational)
VBUS
3
–
Must be connected to VDD
VCCC
10
–
Analog power supply for codec (5)
VCCP1
17
–
Analog power supply for PLL (5)
VCCP2
19
–
Analog power supply for PLL (5)
VCCX
23
–
Analog power supply for oscillator (5)
VCOM
14
–
Common for ADC/DAC (VCCC/2)
(2)
(5)
(5)
VDD
27
–
Digital power supply
VINL
12
I
ADC analog input for L-channel
VINR
13
I
ADC analog input for R-channel
VOUTL
16
O
DAC analog output for L-channel
VOUTR
15
O
DAC analog output for R-channel
XTI
21
I
Crystal oscillator input (6)
(1)
(2)
(3)
(4)
(5)
(6)
6
(4)
LV-TTL level.
3.3-V CMOS-level input with internal pulldown, 5-V tolerant.
3.3-V CMOS-level input with internal pulldown. This pin informs the PC of serviceable control signals such as mute, volume up, or
volume down, which have no direct connection with the internal DAC or ADC. See the Interface #3 and End-Points sections.
TTL Schmitt trigger, 5-V tolerant.
Connect a decoupling capacitor to GND.
3.3-V CMOS-level input.
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SLES228 – DECEMBER 2008
Table 1. TERMINAL FUNCTIONS (continued)
TERMINAL
NAME
XTO
NO.
I/O
DESCRIPTION
20
O
Crystal oscillator output
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PCM2903B
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FUNCTIONAL BLOCK DIAGRAM
VCCC
VCCP1
VCCP2
VCCX
VDD
Lock
DIN
AGNDC
AGNDP
AGNDX
DGND
Power
Manager
DGNDU
SSPND
S/PDIF Decoder
VBUS
VINR
ISO-In
End-Point
Analog
PLL
VCOM
Selector
Analog
PLL
VOUTL
FIFO
DAC
VOUTR
DOUT
D+
D–
Control
End-Point
SEL0
SEL1
ISO-Out
End-Point
HID
End-Point
S/PDIF Encoder
XCVR
FIFO
ADC
USB SIE
VINL
HID0
HID1
HID2
USB
Protocol
Controller
PLL (´8)
XTI
12 MHz
96 MHz
Tracker
(SpAct)
XTO
B0239-02
8
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SLES228 – DECEMBER 2008
BLOCK DIAGRAM OF ANALOG FRONT-END (RIGHT CHANNEL)
4.7 mF
+
VINR
30 kW
13
–
–
+
(+)
+
(–)
Delta-Sigma
Modulator
VCOM
14
+
(VCCC/2)
10 mF
Reference
S0011-07
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TYPICAL CHARACTERISTICS: ADC
All specifications at TA = +25°C, VDD = VCCC = VCCP1 = VCCP2 = VCCx = 3.3 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless
otherwise noted.
DYNAMIC RANGE and SNR
vs
FREE-AIR TEMPERATURE
95
0.009
Dynamic Range and SNR − dB
THD+N − Total Harmonic Distortion + Noise − %
TOTAL HARMONIC DISTORTION + NOISE at –1 dB
vs
FREE-AIR TEMPERATURE
0.010
0.008
0.007
0.006
0.005
91
Dynamic Range
89
SNR
87
0.004
0.003
−50
−25
0
25
50
75
85
−50
100
TA − Free-Air Temperature − °C
0
25
50
75
G001
Figure 1.
Figure 2.
TOTAL HARMONIC DISTORTION + NOISE at –1 dB
vs
SUPPLY VOLTAGE
DYNAMIC RANGE and SNR
vs
SUPPLY VOLTAGE
100
G002
95
Dynamic Range and SNR − dB
0.009
0.008
0.007
0.006
0.005
93
91
Dynamic Range
89
SNR
87
0.004
0.003
2.8
3.0
3.2
3.4
VCC − Supply Voltage − V
3.6
3.8
85
2.8
G003
Figure 3.
10
−25
TA − Free-Air Temperature − °C
0.010
THD+N − Total Harmonic Distortion + Noise − %
93
3.0
3.2
3.4
VCC − Supply Voltage − V
3.6
3.8
G004
Figure 4.
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TYPICAL CHARACTERISTICS: ADC (continued)
All specifications at TA = +25°C, VDD = VCCC = VCCP1 = VCCP2 = VCCx = 3.3 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless
otherwise noted.
TOTAL HARMONIC DISTORTION + NOISE at –1 dB
vs
SAMPLING FREQUENCY
DYNAMIC RANGE and SNR
vs
SAMPLING FREQUENCY
95
0.009
Dynamic Range and SNR − dB
THD+N − Total Harmonic Distortion + Noise − %
0.010
0.008
0.007
0.006
0.005
93
91
Dynamic Range
89
SNR
87
0.004
0.003
85
30
35
40
45
50
fS − Sampling Frequency − kHz
30
35
40
45
50
fS − Sampling Frequency − kHz
G005
Figure 5.
G006
Figure 6.
TYPICAL CHARACTERISTICS: DAC
All specifications at TA = +25°C, VDD = VCCC = VCCP1 = VCCP2 = VCCx = 3.3 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless
otherwise noted.
TOTAL HARMONIC DISTORTION + NOISE at 0 dB
vs
FREE-AIR TEMPERATURE
DYNAMIC RANGE and SNR
vs
FREE-AIR TEMPERATURE
98
97
0.007
Dynamic Range and SNR − dB
THD+N − Total Harmonic Distortion + Noise − %
0.008
0.006
0.005
0.004
SNR
96
95
Dynamic Range
94
93
92
91
0.003
−50
−25
0
25
50
75
TA − Free-Air Temperature − °C
100
90
−50
G007
Figure 7.
−25
0
25
50
75
TA − Free-Air Temperature − °C
100
G008
Figure 8.
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TYPICAL CHARACTERISTICS: DAC (continued)
All specifications at TA = +25°C, VDD = VCCC = VCCP1 = VCCP2 = VCCx = 3.3 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless
otherwise noted.
TOTAL HARMONIC DISTORTION + NOISE at 0 dB
vs
SUPPLY VOLTAGE
DYNAMIC RANGE and SNR
vs
SUPPLY VOLTAGE
98
97
0.007
Dynamic Range and SNR − dB
THD+N − Total Harmonic Distortion + Noise − %
0.008
0.006
0.005
0.004
95
Dynamic Range
94
93
92
91
0.003
3.0
3.1
3.2
3.3
3.4
3.5
90
3.0
3.6
VCC − Supply Voltage − V
3.2
3.3
3.4
3.5
G009
Figure 9.
Figure 10.
TOTAL HARMONIC DISTORTION + NOISE at 0 dB
vs
SAMPLING FREQUENCY
DYNAMIC RANGE and SNR
vs
SAMPLING FREQUENCY
3.6
G010
98
97
Dynamic Range and SNR - dB
0.007
0.006
0.005
0.004
SNR
96
95
94
93
Dynamic Range
92
91
90
0.003
30
35
40
45
30
50
fS − Sampling Frequency − kHz
G011
Figure 11.
12
3.1
VCC − Supply Voltage − V
0.008
THD+N − Total Harmonic Distortion + Noise − %
SNR
96
35
40
45
fS - Sampling Frequency - kHz
50
G012
Figure 12.
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TYPICAL CHARACTERISTICS: ADC OUTPUT SPECTRUM
All specifications at TA = +25°C, VDD = VCCC = VCCP1 = VCCP2 = VCCx = 3.3 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless
otherwise noted.
OUTPUT SPECTRUM (–60 dB, N = 8192)
0
−20
−20
−40
−40
Amplitude − dB
Amplitude − dB
OUTPUT SPECTRUM (–1 dB, N = 8192)
0
−60
−80
−60
−80
−100
−100
−120
−120
−140
−140
0
5
10
15
20
0
5
f − Frequency − kHz
10
15
20
f − Frequency − kHz
G013
G014
Figure 13.
Figure 14.
TYPICAL CHARACTERISTICS: DAC OUTPUT SPECTRUM
All specifications at TA = +25°C, VDD = VCCC = VCCP1 = VCCP2 = VCCx = 3.3 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless
otherwise noted.
OUTPUT SPECTRUM (–60 dB, N = 8192)
0
−20
−20
−40
−40
Amplitude − dB
Amplitude − dB
OUTPUT SPECTRUM (0 dB, N = 8192)
0
−60
−80
−60
−80
−100
−100
−120
−120
−140
−140
0
5
10
15
20
0
f − Frequency − kHz
5
10
15
20
f − Frequency − kHz
G015
Figure 15.
G016
Figure 16.
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TYPICAL CHARACTERISTICS: SUPPLY CURRENT
80
70
1.4
70
1.2
60
Operational
50
1.0
40
0.8
30
0.6
20
0.4
Suspend
10
OPERATIONAL SUPPLY CURRENT
vs
SAMPLING FREQUENCY
0.2
0
3.0
3.1
3.2
3.3
3.4
3.5
60
50
ADC and DAC
40
30
20
10
0
0.0
3.6
VDD, VCCC, VCCP1, VCCP2, VCCX − Supply Voltage − V
ICC − Operational Supply Current − mA
80
OPERATIONAL and SUSPEND SUPPLY CURRENT
vs
SUPPLY VOLTAGE
1.6
ICC − Suspend Supply Current − mA
ICC − Operational Supply Current − mA
All specifications at TA = +25°C, VDD = VCCC = VCCP1 = VCCP2 = VCCx = 3.3 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless
otherwise noted.
30
G017
Figure 17.
14
35
40
45
fS − Sampling Frequency − kHz
50
G018
Figure 18.
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TYPICAL CHARACTERISTICS: ADC DIGITAL DECIMATION FILTER FREQUENCY RESPONSE
All specifications at TA = +25°C, VDD = VCCC = VCCP1 = VCCP2 = VCCx = 3.3 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless
otherwise noted.
OVERALL CHARACTERISTICS
STOP-BAND ATTENUATION
0
0
−10
−20
−20
−40
Amplitude − dB
Amplitude − dB
−30
−60
−80
−100
−40
−50
−60
−70
−120
−80
−140
−90
−160
0
8
16
24
−100
0.0
32
Frequency [y fS]
0.2
0.8
1.0
G020
Figure 20.
PASSBAND RIPPLE
TRANSITION-BAND RESPONSE
0.2
0
0.0
−4
Amplitude − dB
Amplitude − dB
0.6
Frequency [y fS]
G019
Figure 19.
−0.2
−0.4
−0.6
−0.8
0.0
0.4
−8
−12
−16
0.1
0.2
0.3
Frequency [y fS]
0.4
0.5
−20
0.46
G021
Figure 21.
0.48
0.50
0.52
0.54
Frequency [y fS]
G022
Figure 22.
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TYPICAL CHARACTERISTICS: ADC DIGITAL HIGH-PASS FILTER FREQUENCY RESPONSE
All specifications at TA = +25°C, VDD = VCCC = VCCP1 = VCCP2 = VCCx = 3.3 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless
otherwise noted.
STOP-BAND CHARACTERISTICS
PASSBAND CHARACTERISTICS
0.0
0
−10
−0.2
−20
Amplitude − dB
Amplitude − dB
−30
−40
−50
−60
−0.4
−0.6
−70
−0.8
−80
−90
−100
0.0
−1.0
0.1
0.2
0.3
0
0.4
Frequency [y fS/1000]
1
2
3
Frequency [y fS/1000]
G023
Figure 23.
4
G024
Figure 24.
TYPICAL CHARACTERISTICS: ADC ANALOG ANTIALIASING FILTER FREQUENCY RESPONSE
All specifications at TA = +25°C, VDD = VCCC = VCCP1 = VCCP2 = VCCx = 3.3 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless
otherwise noted.
PASSBAND CHARACTERISTICS
0.0
−10
−0.2
Amplitude − dB
Amplitude − dB
STOP-BAND CHARACTERISTICS
0
−20
−30
−0.4
−0.6
−0.8
−40
−50
1
10
100
1k
10k
−1.0
0.01
0.1
1
100
G026
G025
Figure 25.
16
10
f − Frequency − kHz
f − Frequency − kHz
Figure 26.
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TYPICAL CHARACTERISTICS: DAC DIGITAL INTERPOLATION FILTER FREQUENCY
RESPONSE
All specifications at TA = +25°C, VDD = VCCC = VCCP1 = VCCP2 = VCCx = 3.3 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless
otherwise noted.
STOP-BAND ATTENUATION
PASSBAND RIPPLE
0
0.2
−10
−20
0.0
Amplitude − dB
Amplitude − dB
−30
−40
−50
−60
−0.2
−0.4
−70
−80
−0.6
−90
−100
0
1
2
3
−0.8
0.0
4
Frequency [y fS]
0.1
0.2
0.3
0.4
Frequency [y fS]
G027
Figure 27.
0.5
G028
Figure 28.
TRANSITION-BAND RESPONSE
0
−2
−4
Amplitude − dB
−6
−8
−10
−12
−14
−16
−18
−20
0.46 0.47 0.48
0.49 0.50 0.51
0.52 0.53 0.54
Frequency [y fS]
G029
Figure 29.
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TYPICAL CHARACTERISTICS: DAC ANALOG FIR FILTER FREQUENCY RESPONSE
All specifications at TA = +25°C, VDD = VCCC = VCCP1 = VCCP2 = VCCx = 3.3 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless
otherwise noted.
PASSBAND CHARACTERISTICS
0.2
−10
0.0
Amplitude − dB
Amplitude − dB
STOP-BAND CHARACTERISTICS
0
−20
−30
−0.2
−0.4
−0.6
−40
−0.8
0.0
−50
0
8
16
24
32
Frequency [y fS]
0.1
0.2
0.3
0.4
Frequency [y fS]
G030
Figure 30.
0.5
G031
Figure 31.
TYPICAL CHARACTERISTICS: DAC ANALOG LOW-PASS FILTER FREQUENCY RESPONSE
All specifications at TA = +25°C, VDD = VCCC = VCCP1 = VCCP2 = VCCx = 3.3 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless
otherwise noted.
PASSBAND CHARACTERISTICS
0.0
−10
−0.2
Amplitude − dB
Amplitude − dB
STOP-BAND CHARACTERISTICS
0
−20
−30
−0.4
−0.6
−0.8
−40
−50
1
10
100
1k
10k
−1.0
0.01
0.1
1
100
G033
G032
Figure 32.
18
10
f − Frequency − kHz
f − Frequency − kHz
Figure 33.
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DETAILED DESCRIPTION
USB INTERFACE
Control data and audio data are transferred to the PCM2903B via D+ (pin 1) and D– (pin 2). All data to/from the
PCM2903B are transferred at full speed. The device descriprtor contains the information described in Table 2.
The device descriptor can be modified on request; contact a Texas Instruments representative for details.
Table 2. Device Descriptor
USB revision
2.0 compliant
Device class
0x00 (device-defined interface level)
Device subclass
0x00 (not specified)
Device protocol
0x00 (not specified)
Max packet size for end-point 0
8 bytes
Vendor ID
0x08BB (default value, can be modified)
Product ID
0x29B3 (default value, can be modified)
Device release number
1.0 (0x0100)
Number of configurations
1
Vendor strings
String #1 (see Table 4)
Product strings
String #2 (see Table 4)
Serial number
Not supported
The configuration descriptor contains the information described in Table 3. The configuration descriptor can be
modified on request; contact a Texas Instruments representative for details.
Table 3. Configuration Descriptor
Interface
Four interfaces
Power attribute
0xC0 (Self-powered, no remote wakeup)
Maximum power
0x0A (20 mA. Default value, can be modified)
The string descriptor contains the information described in Table 4. The string descriptor can be modified on
request; contact a Texas Instruments representative for details.
Table 4. String Descriptor
#0
0x0409
#1
Burr-Brown from TI (default value, can be modified)
#2
USB Audio CODEC (default value, can be modified)
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DEVICE CONFIGURATON
Figure 34 illustrates the USB audio function topology. The PCM2903B has four interfaces. Each interface
consists of alternative settings.
End-Point #0
Default End-Point
FU
End-Point #2
(IF #1)
Analog Out
IT
TID1
OT
TID2
Audio Streaming Interface
UID3
End-Point #4
(IF #2)
Analog In
IT
TID4
OT
TID5
Audio Streaming Interface
Standard Audio Control Interface (IF #0)
End-Point #5
(IF #3)
HID Interface
PCM2903B
M0024-04
Figure 34. USB Audio Function Topology
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Interface #0
Interface #0 is the control interface. Alternative setting #0 is the only possible setting for interface #0. Alternative
setting #0 describes the standard audio control interface. The audio control interface consists of a single
terminal. The PCM2903B has the following five terminals:
• Input terminal (IT #1) for isochronous-out stream
• Output terminal (OT #2) for audio analog output
• Feature unit (FU #3) for DAC digital attenuator
• Input terminal (IT #4) for audio analog input
• Output terminal (OT #5) for isochronous-in stream
Input terminal #1 is defined as USB stream (terminal type 0x0101). Input terminal #1 can accept two-channel
audio streams consisting of left and right channels. Output terminal #2 is defined as a speaker (terminal type
0x0301). Input terminal #4 is defined as a microphone (terminal type 0x0201). Output terminal #5 is defined as a
USB stream (terminal type 0x0101). Output terminal #5 can generate two-channel audio streams composed of
left and right channel data. Feature unit #3 supports the following sound control features:
• Volume control
• Mute control
The built-in digital volume controller can be manipulated by an audio class specific request from 0 dB to –64 dB
in 1-dB steps. Changes are made by incrementing or decrementing by one step (1 dB) for every 1/fS time interval
until the volume level has reached the requested value. Each channel can be set for different values. The master
volume control is not supported. A request to the master volume is stalled and ignored. The built-in digital mute
controller can be manipulated by audio class-specific request. A master mute control request is acceptable. A
request to an individual channel is stalled and ignored.
Interface #1
Interface #1 is the audio streaming data-out interface. Interface #1 has the five alternative settings described in
Table 5. Alternative setting #0 is the zero-bandwidth setting.
Table 5. Interface #1 Alternative Settings
ALTERNATIVE
SETTING
DATA FORMAT
00
TRANSFER
MODE
SAMPLING RATE
(kHz)
Zero bandwidth
01
16-bit
Stereo
Twos complement (PCM)
Adaptive
32, 44.1, 48
02
03
16-bit
Mono
Twos complement (PCM)
Adaptive
32, 44.1, 48
8-bit
Stereo
Twos complement (PCM)
Adaptive
04
32, 44.1, 48
8-bit
Mono
Twos complement (PCM)
Adaptive
32, 44.1, 48
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Interface #2
Interface #2 is the audio streaming data-in interface. Interface #2 has the 19 alternative settings described in
Table 6. Alternative setting #0 is the zero-bandwidth setting. All other alternative settings are operational settings.
Table 6. Interface #2 Alternative Settings
ALTERNATIVE
SETTING
DATA FORMAT
00
TRANSFER
MODE
SAMPLING RATE
(kHz)
48
Zero bandwidth
01
16-bit
Stereo
Twos complement (PCM)
Asynchronous
02
03
16-bit
Mono
Twos complement (PCM)
Asynchronous
48
16-bit
Stereo
Twos complement (PCM)
Asynchronous
44.1
04
05
16-bit
Mono
Twos complement (PCM)
Asynchronous
44.1
16-bit
Stereo
Twos complement (PCM)
Asynchronous
32
06
07
16-bit
Mono
Twos complement (PCM)
Asynchronous
32
16-bit
Stereo
Twos complement (PCM)
Asynchronous
22.05
08
16-bit
Mono
Twos complement (PCM)
Asynchronous
22.05
09
16-bit
Stereo
Twos complement (PCM)
Asynchronous
16
0A
16-bit
Mono
Twos complement (PCM)
Asynchronous
16
0B
8-bit
Stereo
Twos complement (PCM)
Asynchronous
16
0C
8-bit
Mono
Twos complement (PCM)
Asynchronous
16
0D
8-bit
Stereo
Twos complement (PCM)
Asynchronous
8
0E
8-bit
Mono
Twos complement (PCM)
Asynchronous
8
0F
16-bit
Stereo
Twos complement (PCM)
Synchronous
11.025
10
16-bit
Mono
Twos complement (PCM)
Synchronous
11.025
11
8-bit
Stereo
Twos complement (PCM)
Synchronous
11.025
12
8-bit
Mono
Twos complement (PCM)
Synchronous
11.025
Interface #3
Interface #3 is the interrupt data-in interface. Alternative setting #0 is the only possible setting for interface #3.
Interface #3 consists of the HID consumer control device and reports the status of these three key parameters:
• Mute (0xE209)
• Volume up (0xE909)
• Volume down (0xEA09)
End-Points
The PCM2903B has the following four end-points:
• Control end-point (EP #0)
• Isochronous-out audio data stream end-point (EP #2)
• Isochronous-in audio data stream end-point (EP #4)
• HID end-point (EP #5)
The control end-point is a default end-point. The control end-point is used to control all functions of the
PCM2903B by the standard USB request and an USB audio class specific request from the host. The
isochronous-out audio data stream end-point is an audio sink end-point, which receives the PCM audio data. The
isochronous-out audio data stream end-point accepts the adaptive transfer mode. The isochronous-in audio data
stream end-point is an audio source end-point that transmits the PCM audio data. The isochronous-in audio data
stream end-point uses asynchronous transfer mode. The HID end-point is an interrupt-in end-point. HID endpoint reports HID0, HID1, and HID2 pin status every 32 ms.
The human interface device (HID) pins are defined as consumer control devices. The HID function is designed
as an independent end-point from both isochronous-in and -out end-points. Therefore, the result obtained from
the HID operation depends on the host software. Typically, the HID function is used as the primary audio-out
device.
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Clock and Reset
The PCM2903B requires a 12-MHz (±500 ppm) clock for the USB and audio function, which can be generated by
a built-in crystal oscillator with a 12-MHz crystal resonator or supplied by an external clock. The 12-MHz crystal
resonator must be connected to XTI (pin 21) and XTO (pin 20) with one high (1-MΩ) resistor and two small
capacitors, the capacitance of which depends on the load capacitance of the crystal resonator. If the external
clock is used, the clock must be supplied to XTI, and XTO must be open.
The PCM2903B has an internal power-on reset circuit, which triggers automatically when VDD (pin 27) exceeds
2.5 V typical (2.7 V to 2.2 V). Approximately 700 μs is required until internal reset release.
Digital Audio Interface
The PCM2903B employs both S/PDIF input and output. Isochronous-out data from the host are encoded to the
S/PDIF output and the DAC analog output. Input data are selected as either S/PDIF or ADC analog input. When
the device detects an S/PDIF input and successfully locks on the received data, the isochronous-in transfer data
source is automatically selected from S/PDIF itself; otherwise, the data source selected is the ADC analog input.
This feature is a customer option. It is the responsibility of the user to implement this feature.
Supported Input/Output Data
The following data formats are accepted by the S/PDIF input and output. All other data formats are unable to use
S/PDIF.
• 48-kHz 16-bit stereo
• 44.1-kHz 16-bit stereo
• 32-kHz 16-bit stereo
Any mismatch of the sampling rate between the input S/PDIF signal and the host command is not acceptable.
Any mismatch of the data format between the input S/PDIF signal and the host command may cause unexpected
results, with the following exceptions:
• Recording in monaural format from stereo data input at the same data rate
• Recording in 8-bit format from 16-bit data input at the same data rate
A combination of these two conditions is not acceptable.
For playback, all possible data-rate sources are converted to 16-bit stereo format at the same source data rate.
Channel Status Information
The channel status information is fixed as consumer application, PCM mode, copyright, and digital/digital
converter. All other bits are fixed as 0's except for the sample frequency, which is set automatically according to
the data received through the USB.
Copyright Management
Isochronous-in data are affected by the serial copy management system (SCMS). When the control bit indicates
that the received digital audio data are original, the input digital audio data are transferred to the host. If the data
are indicated as first generation or higher, the transferred data are routed to the analog input.
Digital audio data output is always encoded as original with SCMS control.
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INTERFACE SEQUENCE
Power On, Attach, and Playback Sequence
The PCM2903B is ready for setup when the reset sequence has finished and the USB bus is attached. In order
to perform certain reset sequences defined in the USB specification, VDD, VCCC, VCCP1, VCCP2, and VCCX must rise
up within 10 ms / 3.3 V. After connection has been established by setup, the PCM2903B is ready to accept USB
audio data. While waiting, the audio data (idle state) and analog output are set to bipolar zero (BPZ).
When receiving the audio data, the PCM2903B stores the first audio packet, which contained 1-ms audio data,
into the internal storage buffer. The PCM2903B starts playing the audio data when detecting the next start of
frame (SOF) packet, as illustrated in Figure 35 and Figure 36.
3.3 V (Typ)
VDD (Pin 27)
2.5 V (Typ)
0V
5 V = VBUS
(Typ)
SEL1 (Pin 9)
Bus Reset
st
1 Audio Data
Set Configuration
2
nd
Audio Data
Bus Idle
D+/D–
SOF
SOF
SOF
SSPND
BPZ
VOUTL
VOUTR
700 ms
Device Setup
1 ms
Internal Reset
Ready for Setup
Ready for Playback
Attach
(Connect to USB Bus)
T0055-03
Figure 35. Attach After Power On
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3.3 V (Typ)
VDD (Pin 27)
2.5 V (Typ)
0V
5 V = VBUS
(Typ)
SEL1 (Pin 9)
Bus Reset
st
1 Audio Data
Set Configuration
2
nd
Audio Data
Bus Idle
D+/D–
SOF
SOF
SOF
SSPND
BPZ
VOUTL
VOUTR
700 ms
Device Setup
1 ms
Internal Reset
Ready for Setup
Ready for Playback
T0273-01
Figure 36. Power-On Under Attach
Play, Stop, and Detach Sequence
When the host finishes or aborts the playback, the PCM2903B stops playing after the last audio data have
played, as shown in Figure 37.
5 V = VBUS
(Typ)
SEL1 (Pin 9)
Audio Data
Audio Data
Last Audio Data
D+/D–
SOF
SOF
SOF
SOF
SOF
VOUTL
VOUTR
Detach
1 ms
T0056-03
Figure 37. Play, Stop, and Detach Sequence
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Record Sequence
The PCM2903B starts the audio capture into the internal memory after receiving the SET_INTERFACE
command, as shown in Figure 38.
Audio Data
SET_INTERFACE
IN Token
Audio Data
IN Token
Audio Data
IN Token
D+/D–
SOF
SOF
SOF
SOF
SOF
VINL
VINR
1 ms
T0259-01
Figure 38. Record Sequence
Suspend and Resume Sequence
The PCM2903B enters the suspend state after it detects a constant idle state on the USB bus (approximately
5 ms), as shown in Figure 39. While the PCM2903B enters the suspend state, the SSPND flag (pin 28) is
asserted. The PCM2903B wakes up immediately after detecting a non-idle state on the USB bus.
Idle
D+/D–
SSPND
5 ms
Active
Suspend
Active
T0057-02
Figure 39. Suspend and Resume Sequence
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APPLICATION INFORMATION
TYPICAL CIRCUIT CONNECTION
Figure 40 illustrates a typical circuit connection for a simple application. The circuit illustrated is for information
only. The entire board design should be considered to meet the USB specification as a USB-compliant product.
VDD (3.3 V)
VCC (3.3 V)
1.5 kW ´ 3
IC1
PCM2903B
1.5 kW
22 W
D+
1 D+
SSPND
28
2
D–
VDD
27
VBUS
3
VBUS
DGND
26
GND
4
DGNDU
DOUT 25
5
HID0
DIN
24
6
HID1
VCCX
23
7
HID2
AGNDX
22
8
SEL0
XTI
21
9
SEL1
XTO
20
10
VCCC
VCCP2
19
11
AGNDC
AGNDP
18
12
VINL
VCCP1 17
13
VINR
VOUTL
16
14
VCOM
VOUTR
15
22 W
D–
C1
1 MW
C9
C10
C2
C3
C4
C5
1 MW
C6
12 MHz
C7
MUTE/
Power Down
C8
C11
C12
LPF,
Amp
LPF,
Amp
S0312-02
NOTE: IC1 must be driven by VDD with a 5-V tolerant input.
C1, C2, C3, C4, C7, C8: 10 μF
C5, C6: 10 pF to 33 pF (depending on crystal resonator)
C9, C10, C11, C12: The capacitance may vary depending on design.
Figure 40. Self-Powered Configuration
Operating Environment
For current information on the PCM2903B operating environment, see the Updated Operating Environments for
PCM270X, PCM290X Applications application report, SLAA374.
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PACKAGE OPTION ADDENDUM
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10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
PCM2903BDB
NRND
SSOP
DB
28
50
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-25 to 85
PCM2903B
PCM2903BDBR
NRND
SSOP
DB
28
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-25 to 85
PCM2903B
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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