PCM2912APJTR [TI]
AUDIO CODEC WITH USB INTERFACE, MONO MICROPHONE INPUT AND STEREO HEADPHONE OUTPUT; 带USB接口，单声道麦克风输入和立体声耳机输出音频编解码器
| 型号： | PCM2912APJTR |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | AUDIO CODEC WITH USB INTERFACE, MONO MICROPHONE INPUT AND STEREO HEADPHONE OUTPUT |
| 文件： | 总32页 (文件大小：839K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PCM2912A
Burr-Brown Audio
www.ti.com.......................................................................................................................................................................................... SLES230–SEPTEMBER 2008
AUDIO CODEC WITH USB INTERFACE,
MONO MICROPHONE INPUT AND STEREO HEADPHONE OUTPUT
1
FEATURES
234
•
On-Chip USB Interface:
– Oversampling Digital Filter
–
–
–
–
–
With Full-Speed Transceivers
Fully Compliant with USB 2.0 Specification
Certified By USB-IF
–
–
–
–
–
Passband Ripple: ±0.1 dB
Stop-Band Attenuation: –43 dB
Single-Ended Voltage Output
Analog LPF Included
Partially Programmable Descriptors
Adaptive Isochronous Transfer for
Playback
Sidetone PGA, Output PGA, and HP
Amplifier
–
Asynchronous Isochronous Transfer for
Record
•
Multifunctions:
–
–
Suspend, Playback, and Record Status Flag
–
Bus Powered
Microphone Amplifier, Mute, and Gain
Control
•
16-Bit Delta-Sigma ADC and DAC
Sampling Rate:
•
•
•
•
•
•
Pop/Click Noise-Free
–
8, 11.025, 16, 22.05, 32, 44.1, 48 kHz
On-Chip Clock Generator:
With Single 6-MHz Clock Source
Mono ADC with Microphone Input
Single Power-Supply: 5 V Typ (VBUS
Package: 32-Pin TQFP
)
–
APPLICATIONS
•
•
•
•
•
•
•
USB Headset
USB Headphone
USB Speaker
USB Featured Consumer Audio Product
USB Audio Interface Box
USB Monitor
–
Analog Performance at VBUS = 5 V:
–
–
–
THD+N: 0.01%
SNR: 92 dB
Dynamic Range: 90 dB
–
Decimation Digital Filter
–
–
Passband Ripple: ±0.05 dB
Video Conference System
Stop-Band Attenuation: –65 dB
DESCRIPTION
–
–
–
–
Single-Ended Voltage Input
Antialiasing Filter Included
Digital HPF Included
The PCM2912A is the Texas Instruments single-chip,
USB stereo audio codec with a USB 2.0-compliant
full-speed protocol controller and an analog front-end
(AFE) function for headset applications. The USB
protocol controller works with no software code, but
USB descriptors can be modified on request(1). The
PCM2912A employs SpAct™ architecture, TI’s
unique system that recovers the audio clock from
USB packet data. On-chip analog PLLs with SpAct
enables independent playback and record sampling
rates with low clock jitters.
Microphone Bias, Microphone Amplifier,
and Input PGA
•
Stereo DAC With Headphone Output
Analog Performance at VBUS = 5.0 V:
–
–
–
–
–
–
–
THD+N: 0.01% (RL > 10 kΩ)
THD+N: 0.02% (RL = 32 Ω)
SNR: 92 dB
Dynamic Range: 90 dB
PO: 13 mW (RL = 32 Ω)
PO: 25 mW (RL = 16 Ω)
(1) The descriptor can be modified by changing a mask; contact
your local representative for details.
1
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.
2
3
4
SpAct is a trademark of Texas Instruments.
Audio Precision, System Two 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
PCM2912A
SLES230–SEPTEMBER 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.
ABSOLUTE MAXIMUM RATINGS(1)(2)
Over operating free-air temperature range (unless otherwise noted).
PARAMETER
PCM2912A
–0.3 to +6.5
±0.1
UNIT
V
Supply voltage
VBUS
Ground voltage differences: BGND, PGND, AGND, HGND, DGND
Input voltage : VCCP, VCCA, VCCL, VCCR, VDD
V
–0.3 to 4
–0.3 to 6.5
–0.3 to 4
–0.3 to 4
±10
V
PLAY, REC.
V
Digital input voltage
D+, D–, XTI, XTO, MMUTE, TEST0, TEST1, POWER, MAMP, SSPND
MBIAS, VIN, VCOM1, VCOM2, VOUTL, VOUTR, FR, FL
V
Analog input voltage
V
Input current (any pins except supplies)
Ambient temperature under bias
Storage temperature
mA
°C
°C
°C
–40 to +125
–55 to +150
+150
Junction temperature
(1) 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 Recommended Operating
Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltage values are with respect to network ground terminal.
RECOMMENDED OPERATING CONDITIONS
Over operating free-air temperature range (unless otherwise noted).
PARAMETER
MIN
NOM
5.00
MAX
UNIT
V
VBUS
Supply voltage
4.35
5.25
Analog input voltage, full scale (–0 dB)
Digital input logic family
0.43 VCCA
TTL
VPP
Digital input clock frequency
Analog output load resistance
Analog output load capacitance
Digital output load capacitance
Operating free-air temperature
5.997
32
6.000
6.003
MHz
Ω
100
10
pF
pF
°C
TA
–25
+70
2
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Product Folder Link(s): PCM2912A
PCM2912A
www.ti.com.......................................................................................................................................................................................... SLES230–SEPTEMBER 2008
ELECTRICAL CHARACTERISTICS
All specifications at TA = +25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, and 16-bit data, unless otherwise noted.
PCM2912A
PARAMETER
DIGITAL INPUT/OUTPUT
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Host interface
Apply USB revision 2.0, full-speed
USB isochronous data format
Audio data format
INPUT LOGIC
VIH
VIL
2
3.3
0.8
Input logic level
VDC
µA
(1)(2)
IIH
VIN = 3.3 V
VIN = 0 V
±10
±10
100
±10
(1)(2)
IIL
Input logic current
(3)
IIH
VIN = 3.3 V
VIN = 0 V
65
µA
(3)
IIL
OUTPUT LOGIC
(1)
VOH
IOH = –10 mA
IOL = 10 mA
IOH = –2 mA
IOL = 2 mA
IOL = 8 mA
VIN = 5 V
2.9
2.8
(1)
VOL
0.3
(4)
VOH
VOL
VOL
Output logic level
VDC
(4)
(5)
0.5
0.5
(5)
IOH
CLOCK FREQUENCY
Input clock frequency, XTI
MICROPHONE BIAS
Output voltage
Output leak current
±10
µA
5.997
6.000
6.003
MHz
0.75 VCCA
VDC
mA
Output current
Output noise
2
5
RL = 1 kΩ
µVRMS
(1) Pins 3, 4: D–, D+.
(2) Pins 8, 23, 24, 27, 28: XTI, MAMP, POWER, TEST1, TEST0
(3) Pin 30: MMUTE
(4) Pins 7, 29: XTO, SSPND
(5) Pins 31, 32: REC, PLAY.
Copyright © 2008, Texas Instruments Incorporated
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ELECTRICAL CHARACTERISTICS (continued)
All specifications at TA = +25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, and 16-bit data, unless otherwise noted.
PCM2912A
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ANALOG-TO-DIGITAL CONVERTER (ADC) CHARACTERISTICS
Resolution
16
1
Bits
Channel
kHz
Audio data channel
Sampling frequency
8, 11.025, 16, 22.05, 32, 44.1, 48
ADC Dynamic Performance(6)
Total harmonic distortion plus
noise
THD+N
SNR
VIN = –1 dB of 0.43 VCCA
0.01
0.02
%
Dynamic range
Signal-to-noise ratio
A-weighted
A-weighted
82
84
90
92
dB
dB
ADC DC Accuracy
Gain error
±2
±0
±10 % of FSR
% of FSR
Bipolar zero error
Analog Input
Input voltage
0.43 VCCA
0.5 VCCA
150
VPP
V
Center voltage
–3 dB
kHz
dB
Antialiasing filter frequency
response
fIN = 20 kHz
–0.08
Microphone Amplifier
Gain
0
20
30
dB
Input impedance
20
1
kΩ
Input PGA
Gain range
–12
dB
dB
Gain step size
ADC Digital Filter Performance
Passband
0.454 fS
±0.02
Hz
Hz
dB
dB
s
Stop band
0.583 fS
–65
Passband ripple
Stop-band attenuation
Delay time
17.4/fS
HPF frequency response
–3 dB
0.078 fS/1000
Hz
(6) fIN = 1 kHz, using Audio Precision™ System Two™, RMS mode with 20-kHz LPF, 400-Hz HPF in calculation. Mic amp = 0 dB,
PGA = 0 dB.
4
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PCM2912A
www.ti.com.......................................................................................................................................................................................... SLES230–SEPTEMBER 2008
ELECTRICAL CHARACTERISTICS (continued)
All specifications at TA = +25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, and 16-bit data, unless otherwise noted.
PCM2912A
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
DIGITAL-TO-ANALOG CONVERTER (DAC) CHARACTERISTICS
Resolution
Audio data channel
16
Bits
Channel
kHz
1, 2
Sampling frequency
8, 11.025, 16, 22.05, 32, 44.1, 48
DAC Dynamic Performance(7)
RL > 10 kΩ, VOUT = 0 dB of 0.6 VCCA
0.01
0.02
90
0.02
0.05
%
%
Total harmonic distortion plus
noise
THD+N
RL = 32 Ω, VOUT = 0 dB of 0.55 VCCA
EIAJ, A-Weighted
Dynamic range
82
84
80
dB
dB
dB
SNR
Signal-to-noise ratio
Channel separation
EIAJ, A-Weighted
92
RL > 10 kΩ
88
DAC DC Accuracy
Gain mismatch
channel-to-channel
Gain error
±2
±10 % of FSR
±2
±3
±10 % of FSR
% of FSR
Bipolar zero error
Analog Output
RL > 10 kΩ
RL = 32 Ω
0.6 VCCA
0.55 VCCA
0.5 VCCA
13
Output voltage
Center voltage
Output power
VPP
V
RL = 32 Ω
RL = 16 Ω
Line
mW
25
10
16
kΩ
Ω
Load impedance (AC coupling)
LPF frequency response
Headphone
–3 dB
32
140
kHz
dB
f = 20 kHz
–0.1
Sidetone Programmable Attenuator
Gain range
–76
–76
0
0
dB
dB
Gain step size
1
1
Output Programmable Attenuator
Gain range
dB
dB
Gain step size
Analog Loopback Performance(8)
RL > 10 kΩ, VIN = 0 dB of 0.43 VCCA
RL = 32 Ω, VIN = 0 dB of 0.43 VCCA
EIAJ, A-weighted
0.01
0.02
90
0.02
0.05
%
%
Total harmonic distortion plus
THD+N
noise
Dynamic range
82
84
dB
dB
SNR
Signal-to-noise ratio
EIAJ, A-weighted
92
DAC Digital Filter Performance
Passband
0.445 fS
±0.1
Hz
Hz
dB
dB
s
Stop band
0.555 fS
–43
Passband ripple
Stop-band attenuation
Delay time
14.3/fS
(7) fOUT = 1 kHz, using Audio Precision System Two, RMS mode with 20-kHz LPF, 400-Hz HPF. Output attenuator = 0 dB,
Sidetone = Mute.
(8) MIC Amp = 0 dB, Sidetone attenuator = 0 dB, Output attenuator = 0 dB.
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PCM2912A
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ELECTRICAL CHARACTERISTICS (continued)
All specifications at TA = +25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, and 16-bit data, unless otherwise noted.
PCM2912A
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
POWER-SUPPLY REQUIREMENTS
VBUS
Voltage range
Bus-powered
4.35
5.0
85
5.25
100
300
500
1
VDC
mA
ADC, DAC operation (RL = 32 Ω)
Suspend mode(9)
Supply current
220
425
0.8
µA
ADC, DAC Operation
mW
mW
Power dissipation
(9)
Suspend mode
VCCP,VCCL
VCCR,VCCA
VDD
,
,
Internally-generated power
supply voltage(10)
3
3.3
3.6
VDC
TEMPERATURE RANGE
Operation temperature
Thermal resistance
(9) Under USB suspend state
(10) Pins 5, 15, 19, 21, 26: VDD, VCCA, VCCL, VCCR, VCCP
–25
+85
°C
θJA
32-pin TQFP
80
°C/W
.
6
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PCM2912A
www.ti.com.......................................................................................................................................................................................... SLES230–SEPTEMBER 2008
PIN ASSIGNMENTS
PJT PACKAGE
TQFP-32
(TOP VIEW)
24 23 22 21 20 19 18 17
16
VIN
25
PGND
15 VCCA
26
VCCP
14 NC
27
28
29
30
31
32
TEST1
TEST0
SSPND
MMUTE
REC
13
AGND
PCM2912A
12
11
10
9
VCOM2
VCOM1
FR
FL
PLAY
1
2
3
4
5
6
7
8
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PCM2912A
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TERMINAL FUNCTIONS
TERMINAL
NAME
BGND
VBUS
D–
PJT
1
I/O
—
DESCRIPTIONS
Reference for internal regulator.
Connect to USB power (VBUS
2
—
)
3
I/O USB differential input/output minus(1)
I/O USB differential input/output plus(1)
D+
4
VDD
5
—
Digital power supply(2)
DGND
XTO
XTI
6
Digital ground
7
O
I
Crystal oscillator output
Crystal oscillator input(3)
8
FL
9
—
—
External filter pin of L-channel (optional)
External filter pin of R-channel (optional)
FR
10
Common voltage for ADC, DAC, and analog front-end (VCCA/2). Decoupling capacitor should be connected to
AGND.
VCOM1
11
—
VCOM2
AGND
NC
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
—
—
—
—
I
Common voltage for headphone (VCCA/2). Decoupling capacitor should be connected to AGND.
Analog ground
Not connected
VCCA
VIN
Analog power supply
ADC microphone input
MBIAS
O
O
—
—
—
O
I
Microphone bias output (0.75 VCCA
)
VOUT
VCC
HGND
VCC
VOUT
L
Headphone output for L-channel
L
Analog power supply for headphone amplifier of L-channel(2)
Analog ground for headphone amplifier
Analog power supply for headphone amplifier of R-channel(2)
R
R
Headphone output for R-channel
Microphone preamplifier gain control (LOW: Preamplifier off, HIGH: Preamplifier on = +20 dB)(3)
MAMP
POWER
PGND
VCCP
(3)
I
Power consumption declaration select pin (LOW: 100 mA, HIGH: 500 mA)
—
—
I
Analog ground for microphone bias, microphone amplifier, and PGA
Analog power supply for PLL(2)
Test pin. Must be set to HIGH(3)
TEST1
TEST0
SSPND
MMUTE
REC
I
Test pin. Must be set to LOW(3)
O
I
Suspend flag (LOW: Suspend, HIGH: Operational state)
Microphone mute control, active HIGH (LOW: Mute off, HIGH: Mute on)(4)
Status output for record (LOW: Record, FLASH: Mute on recode, HIGH: Stop)(5)
Status output for playback (LOW: Playback, FLASH: Mute on playback, HIGH: Stop)(5)
O
O
PLAY
(1) LV-TTL level
(2) Connect decouple capacitor to corresponding ground.
(3) 3.3-V CMOS level input.
(4) 3.3-V CMOS level input with internal pulldown.
(5) 5-V tolerant, open-drain.
8
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PCM2912A
www.ti.com.......................................................................................................................................................................................... SLES230–SEPTEMBER 2008
FUNCTIONAL BLOCK DIAGRAM
V
/V
/V L/V R/V
CC DD
CCA CCP CC
BGND
AGND/ HGND/PGND/DGND
Power
Manager
SSPND
5 V to 3.3 V
Voltage
Regulator
V
REF
V
BUS
MIC
BIAS
MBIAS
PGA + 30 dB ~ –12 dB
in 1 dB steps
D+
D–
MIC
ISO-In
Endpoint
XCVR
FIFO
AMP
V
ADC
IN
+20/0 dB
Selector
USB SIE
Control
Endpoint
POWER
MAMP
Analog
PLL
V
COM2
V
COM1
MMUTE
Analog
PLL
ATT 0 dB ~ –76 dB
in 1 dB steps with Mute
PLAY
REC
V
V
L
OUT
Selector
DAC
ISO-Out
Endpoint
R
FIFO
OUT
HP AMP 15 mW (at 32 W)
ATT 0 dB ~ –76 dB
TEST0
TEST1
in 1 dB steps with Mute
USB Protocol
Controller
FL
FR
Tracker
®
96 MHz
PLL (x16)
(SpAct
)
6.000 MHz
XTI
XTO
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PCM2912A
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TYPICAL CHARACTERISTICS: INTERNAL FILTER
All specifications at TA = +25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, and 16-bit data, unless otherwise noted.
ADC Digital Decimation Filter Frequency Response
OVERALL CHARACTERISTIC
STOP BAND ATTENUATION
0
0
-40
-80
-20
-40
-60
-120
-160
-80
-100
0
8
16
24
32
0
0.2
0.4
0.6
0.8
1.0
Normalized Frequency - x f
Normalized Frequency - x f
S
S
Figure 1.
Figure 2.
PASSBAND RIPPLE
TRANSIENT BAND RESPONSE
0.2
0
0
-0.2
-0.4
-0.6
-0.8
-4
-8
-12
-16
-20
0
0.1
0.2
0.3
0.4
0.5
0.46
0.48
0.50
0.52
0.54
Normalized Frequency - x f
Normalized Frequency - x f
S
S
Figure 3.
Figure 4.
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TYPICAL CHARACTERISTICS: INTERNAL FILTER (continued)
All specifications at TA = +25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, and 16-bit data, unless otherwise noted.
ADC Digital High-Pass Filter Frequency Response
STOP BAND CHARACTERISTIC
PASSBAND CHARACTERISTIC
0
0
-0.2
-20
-0.4
-0.6
-0.8
-1.0
-40
-60
-80
-100
0
1
2
3
4
0
0.1
0.2
0.3
0.4
Normalized Frequency - x f /1000
S
Normalized Frequency - x f /1000
S
Figure 5.
Figure 6.
ADC Analog Antialiasing Filter Frequency Response
STOP BAND CHARACTERISTIC
PASSBAND CHARACTERISTIC
0
0
-0.2
-0.4
-10
-20
-30
-0.6
-0.8
-1.0
-40
-50
0.01
0.1
1
10
100
1
10
100
1000
10000
f - Frequency - kHz
f - Frequency - kHz
Figure 7.
Figure 8.
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TYPICAL CHARACTERISTICS: INTERNAL FILTER (continued)
All specifications at TA = +25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, and 16-bit data, unless otherwise noted.
DAC Digital Interpolation Filter Frequency Response
STOP BAND ATTENUATION
PASSBAND RIPPLE
0.2
0
0
-20
-0.2
-0.4
-40
-60
-80
-0.6
-0.8
-100
0
0.1
0.2
0.3
0.4
0.5
0
1
2
3
4
Normalized Frequency - x f
Normalized Frequency - x f
S
S
Figure 9.
Figure 10.
TRANSIENT BAND RESPONSE
0
-4
-8
-12
-16
-20
0.46
0.48
0.50
0.52
0.54
Normalized Frequency - x f
S
Figure 11.
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TYPICAL CHARACTERISTICS: INTERNAL FILTER (continued)
All specifications at TA = +25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, and 16-bit data, unless otherwise noted.
DAC Analog FIR Filter Frequency Response
STOP BAND CHARACTERISTIC
PASSBAND CHARACTERISTIC
0
-10
-20
-30
-40
-50
0.2
0
-0.2
-0.4
-0.6
-0.8
0
8
16
24
32
0
0.1
0.2
0.3
0.4
0.5
Normalized Frequency - x f
Normalized Frequency - x f
S
S
Figure 12.
Figure 13.
DAC Analog Low-Pass Filter Frequency Response
STOP BAND CHARACTERISTIC
PASSBAND CHARACTERISTIC
0
0
-0.2
-10
-0.4
-0.6
-20
-30
-40
-50
-0.8
-1.0
1
10
100
1000
10000
0.01
0.1
1
10
100
f - Frequency - kHz
f - Frequency - kHz
Figure 14.
Figure 15.
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TYPICAL CHARACTERISTICS
All specifications at TA = +25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, and 16-bit data, unless otherwise noted.
ADC
THD+N AT –1 dB
vs TEMPERATURE
DYNAMIC RANGE AND SIGNAL-TO-NOISE RATIO
vs TEMPERATURE
0.010
0.009
0.008
0.007
0.006
0.005
0.004
0.003
96
94
92
90
88
86
SNR
Dynamic Range
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
T
- Free-Air Temperature - °C
T
- Free-Air Temperature - °C
A
A
Figure 16.
Figure 17.
THD+N AT –1 dB
vs SUPPLY VOLTAGE
DYNAMIC RANGE AND SIGNAL-TO-NOISE RATIO
vs SUPPLY VOLTAGE
0.010
0.009
0.008
0.007
0.006
0.005
0.004
0.003
98
96
94
92
90
SNR
Dynamic Range
88
86
4.2
4.4
4.6
4.8
5.0
5.2
5.4
4.2
4.4
4.6
4.8
5.0
5.2
5.4
V
- Supply Voltage - V
V
- Supply Voltage - V
BUS
BUS
Figure 18.
Figure 19.
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TYPICAL CHARACTERISTICS (continued)
All specifications at TA = +25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, and 16-bit data, unless otherwise noted.
THD+N AT –1 dB
vs SAMPLING FREQUENCY
DYNAMIC RANGE AND SIGNAL-TO-NOISE RATIO
vs SAMPLING FREQUENCY
98
96
94
92
90
0.010
0.009
0.008
0.007
0.006
0.005
SNR
Dynamic Range
88
86
0.004
0.003
30
35
40
45
50
30
35
40
45
50
f
- Sampling Frequency - kHz
f
- Sampling Frequency - kHz
S
S
Figure 20.
Figure 21.
DAC
THD+N AT 0 dB
vs TEMPERATURE
DYNAMIC RANGE AND SIGNAL-TO-NOISE RATIO
vs TEMPERATURE
0.010
0.009
0.008
0.007
0.006
96
94
92
90
88
86
SNR
Dynamic Range
0.005
0.004
0.003
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
T
- Free-Air Temperature - °C
A
T
- Free-Air Temperature - °C
A
Figure 22.
Figure 23.
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TYPICAL CHARACTERISTICS (continued)
All specifications at TA = +25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, and 16-bit data, unless otherwise noted.
THD+N AT 0 dB
vs SUPPLY VOLTAGE
DYNAMIC RANGE AND SIGNAL-TO-NOISE RATIO
vs SUPPLY VOLTAGE
98
96
94
0.010
0.009
0.008
0.007
0.006
SNR
92
90
Dynamic Range
0.005
0.004
0.003
88
86
4.2
4.4
4.6
4.8
5.0
5.2
5.4
4.2
4.4
4.6
4.8
5.0
5.2
5.4
V
- Supply Voltage - V
V
- Supply Voltage - V
BUS
BUS
Figure 24.
Figure 25.
THD+N AT 0 dB
vs SAMPLING FREQUENCY
DYNAMIC RANGE AND SIGNAL-TO-NOISE RATIO
vs SAMPLING FREQUENCY
98
96
94
92
90
88
86
0.010
0.009
0.008
0.007
0.006
0.005
0.004
0.003
SNR
Dynamic Range
30
35
40
45
50
30
35
40
45
50
f
- Sampling Frequency - kHz
f
- Sampling Frequency - kHz
S
S
Figure 26.
Figure 27.
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TYPICAL CHARACTERISTICS (continued)
All specifications at TA = +25°C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, and 16-bit data, unless otherwise noted.
Supply Current
SUPPLY CURRENT
vs SUPPLY VOLTAGE
SUPPLY CURRENT
vs SAMPLING FREQUENCY
100
90
80
70
60
50
0.5
0.4
0.3
0.2
0.1
0
100
90
80
70
60
50
Operational Current
Suspend Current
30
35
40
45
50
4.2
4.4
4.6
4.8
5.0
5.2
5.4
f
- Sampling Frequency - kHz
V
- Supply Voltage - V
S
BUS
Figure 28.
Figure 29.
SUPPLY CURRENT
vs TEMPERATURE AT SUSPEND MODE
0.40
0.35
0.30
USB spec limit for device = 0.3 mA
0.25
0.20
0.15
0.10
-40
-20
0
20
40
60
80
100
T
- Free-Air Temperature - °C
A
Figure 30.
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GENERAL DESCRIPTION
USB INTERFACE
Control data and audio data are transferred to the PCM2912A via D+ (pin 4) and D– (pin 3). All data transferred
to/from the PCM2912A are performed at full speed. Table 1 summarizes the device descriptor. The device
descriptor can be modified on request.
Table 1. Device Descriptor
USB revision
2.0 compliant
Device class
0x00 (device defined in interface level)
0x00 (not specified)
0x00 (not specified)
8-byte
Device sub class
Device protocol
Max packet size for endpoint 0
Vendor ID
0x08BB
Product ID
0x2912
Device release number
Number of configurations
Vendor string
0x0100 (1.00)
1
String #1 (refer to Table 3)
String #2 (refer to Table 3)
Not supported
Product string
Serial number
Table 2 lists the configuration descriptor. The configuration descriptor can be modified on request.
Table 2. Configuration Descriptor
Interface
Three interfaces
Power attribute
Max power
0x80 (Bus powered, no remote wakeup)
0x32 (100 mA at POWER = Low) / 0xFA (500mA at POWER = High)
Table 3 summarizes the string descriptor. The string descriptor can be modified on request.
Table 3. String Descriptor
#0
#1
#2
0x0409
Burr-Brown from TI
USB audio CODEC
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Device Configuration
Figure 31 illustrates the USB audio function topology. The PCM2912A has three interfaces. Each interface is
constructed with some alternative settings.
Endpoint #0
Default Endpoint
FU
Endpoint #1
(IF #1)
IT
TID3
S
OT
TID6
Analog Out
UID4
Audio Streaming Interface
UID5
FU
IT
TID1
UID2
Analog In
FU
Endpoint #1
(IF #1)
OT
TIDB
S
IT
TID7
UIDA
Audio Streaming Interface
UID8
Standard Audio Control Interface (IF #0)
Figure 31. USB Audio Function Topology
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 is constructed with a series
of terminal connections. The PCM2912A has the following 10 terminals:
•
•
•
•
•
•
•
•
•
•
Input terminal (Terminal ID#1) for audio analog input for sidetone
Feature unit (Unit ID#2) for sidetone PGA
Input terminal (Terminal ID#3) for isochronous out stream
Mixer unit (Unit ID#4) for sidetone mixing
Feature unit (Unit ID#5) for analog output PGA
Output terminal (Terminal ID#6) for audio analog output
Input terminal (Terminal ID#7) for audio analog input
Feature unit (Unit ID#8) for analog input PGA
Mixer unit (Unit ID#A) for analog input
Output terminal (Terminal ID#B) for isochronous in stream
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Input terminal #3 is defined as USB stream (terminal type 0x0101). Input terminal #3 can accept two-channel
audio streams constructed by the left and right channels. Output terminal #6 is defined as a speaker (terminal
type 0x0301). Input terminals #1 and #7 are defined as Microphone (terminal type 0x0201). Physically, these two
input terminals are the same input, but logically duplicated. Output terminal B is defined as a USB stream
(terminal type 0x0101). Output terminal B is a single-channel audio stream. Mixer unit #4 multiplexes the analog
input (sidetone) and the audio data of the digital-to-analog converter (DAC). Mixer unit A is placed in front of
output terminal B. Mixer unit A has no impact on recording data. Mixer units #4 and A do not have programming
capability.
Feature unit #5 supports the following sound control features for analog outputs:
•
•
Volume control
Mute control
The built-in volume controller can be manipulated by an audio-class-specific request from 0 dB to –76 dB in
steps of 1 dB. An individual (L and R) channel can be set for different values. The built-in mute controller can be
manipulated by an audio-class-specific request. Only the master mute control request is acceptable.
Feature unit #2 supports the following sound control features for analog input (sidetone):
•
•
Volume control
Mute control
The built-in volume controller can be manipulated by an audio-class-specific request from 0 dB to –76 dB in 1-dB
steps. Only the master volume control is acceptable. The built-in mute controller can be manipulated by
audio-class-specific request. Only the master mute control request is acceptable.
Feature unit #8 supports the following sound control features for analog input (microphone record input):
•
•
Volume control
Mute control
The built-in analog volume controller can be manipulated by an audio-class-specific request from +30 dB to –12
dB in 1-dB steps. The built-in mute controller can be manipulated by an audio-class-specific request. Only the
master mute control request is acceptable.
Interface #1
Interface #1 is the audio streaming interface for data output. Table 4 lists the three alternative settings for
Interface #1. Alternative setting #0 is the zero bandwidth setting. All other alternative settings are operational
settings.
Table 4. Interface #1 Alternative Settings
ALTERNATIVE
SETTING
DATA FORMAT
TRANSFER MODE
Zero Bandwidth
SAMPLING RATE (kHz)
00
8, 11.025, 16, 22.05, 32, 44.1,
48
01
02
16 bit
16 bit
Stereo
Mono
2s complement (PCM)
2s complement (PCM)
Adaptive
Adaptive
8, 11.025, 16, 22.05, 32, 44.1,
48
Interface #2
Interface #2 is the audio streaming interface for data output. Table 5 shows the two alternative settings for
Interface #2. Alternative setting #0 is the Zero Band Width setting. Alternative setting #1 is an operational setting.
Table 5. Interface #2 Alternative Settings
ALTERNATIVE
SETTING
DATA FORMAT
TRANSFER MODE
SAMPLING RATE (kHz)
00
Zero Bandwidth
8, 11.025, 16, 22.05, 32,
44.1, 48
01
16 bit
Mono
2s complement (PCM)
Asynchronous
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Endpoints
The PCM2912A has the following three endpoints:
•
•
•
Control endpoint (EP #0)
Isochronous out audio data stream endpoint (EP #1)
Isochronous in audio data stream endpoint (EP #2)
The control endpoint is the default endpoint. The control endpoint controls all functions of the PCM2912A by the
standard USB request and USB audio class-specific request from the host. The isochronous out audio data
stream endpoint is an audio sink endpoint, which receives the PCM audio data. The isochronous out audio data
stream endpoint accepts the asynchronous transfer mode. The isochronous in audio data stream endpoint is an
audio source endpoint, which transmits the PCM audio data. The isochronous in audio data stream endpoint
uses synchronous transfer mode.
Internal Regulator
All required power sources are generated by five internal regulators.
Each regulator generates 3.3 V (typical, without load) from VBUS (pin 2). Each regulator has an output pin and a
ground return pin (as described in Table 6); this pair must be decoupled with an appropriate capacitor. Note that
this capacitance affects inrush-current limitation. One band-gap reference circuit supplies reference voltage for all
regulators. BGND (pin 1) is provided for reference ground of the band-gap reference.
Table 6. Internal Regulator Summary
SUPPLIED CIRCUIT
Digital
OUTPUT
RETURN
VDD (pin 5)
DGND (pin 6)
AGND (pin 13)
HGND (pin 20)
HGND (pin 20)
PGND (pin 25)
Analog
VCCA (pin 15)
VCCL (pin 19)
VCCR (pin 21)
VCCP (pin 26)
Headphone (L-ch)
Headphone (R-ch)
PLL
Clock and Reset
The PCM2912A requires a 6-MHz (±500 ppm) clock for USB function and audio function, which can be
generated from a built-in crystal oscillator with a 6-MHz crystal resonator. The 6-MHz crystal resonator must be
connected to XTI (pin 8) and XTO (pin 7) with one high (1-MΩ) resistor and two small capacitors, whose
capacitance depends on the load capacitance of the crystal resonator. An external clock can be supplied through
XTI; if an external clock is supplied, XTO must be left open. Because there is no clock disabling signal, using the
external clock supply is not recommended. SSPND (pin 29) is unable to use clock disabling.
The PCM2912A has an internal power-on-reset circuit, which works automatically when VBUS (pin 2) exceeds 2.5
V, typical (2.2 V to 2.7 V), and approximately 700 µs is required until the internal reset is released.
DAC
The PCM2912A has a stereo delta-sigma DAC that uses a 64-fS oversampling technique with an 8-fS
oversampling digital filter. DAC outputs are provided through the headphone amplifier; VOUTL (pin 18) and VOUT
R
(pin 22) provide 13 mW at 32 Ω and 0.6 VCCL/VCCR VPP at a 10-kΩ load.
ADC
The PCM2912A has a mono delta-sigma ADC that uses a 64-fS oversampling technique with a 1/64-fS
decimation digital filter. The microphone input, VIN (pin 16), is fed to the ADC through a +20-dB microphone
amplifier and the PGA, which has +30 dB to –12 dB in 1-dB steps.
Microphone Bias
The PCM2912A has a microphone bias generator, which provides a low-noise, 0.75-VCCA, 2-mA source current
output with appropriate output impedance for electret-microphone driving. This output, MBIAS (pin 17), should be
bypassed to AGND (pin 13) through an appropriate capacitor to reduce the output noise level.
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Microphone Amplifier
The PCM2912A has a low-noise, single-ended, mono microphone amplifier with a mute function that is controlled
by MUTE (pin 30). The signal gain is selectable by MAMP (pin 23). The noise level at the input node is 5 µVRMS
and the input impedance is 20 kΩ.
,
Input PGA
The PCM2912A also has a low-noise input, programmable gain amplifier (PGA) for the microphone amplifier
output/ADC input, with a gain range of +30 dB to –12 dB in 1dB/step.
Sidetone Programmable Attenuator
The PCM2912A has a low-noise, sidetone programmable attenuator with a mute function for the sidetone signal
path (microphone amplifier output to output PGA input), and a gain range of 0 dB to –76 dB in 1 dB/step.
Output Programmable Attenuator
The PCM2912A has a low-noise output programmable attenuator with a mute function for mixed signal, which
affects DAC output signal and sidetone signal. The output PGA gain range is 0 dB to –76 dB in 1 dB/step.
VCOM1 and VCCM2
VCOM2 (pin 12) is provided for the center voltage of the headphone amplifier. VCOM1 (pin 11) is provided for the
center voltage of all other analog circuits. Each VCOM pin must be decoupled with an appropriate capacitor.
Because the headphone output is disconnected when entering the suspend state, determining the capacitance is
important to prevent pop noise, especially for VCOM2 (pin 12). The equivalent resistance of VCOM2 is 500 kΩ, and
VCOM1 is 15 kΩ.
Filter Pins
FL (pin 9) and FR (pin 10) are provided to make a low-pass filter (LPF) to decrease the DAC outband noise, as
shown in Figure 32. This filter is optional.
Side Tone
20 kW
20 kW
10 kW
10 kW
DAC
–
+
VCOM
FR/FL
CF
Figure 32. Filter Circuit
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INTERFACE SEQUENCE
Power-On, Attach, and Play Back Sequence
The PCM2912A is ready for setup when the reset sequence has finished and the USB bus is attached. After a
connection has been established, the PCM2912A is ready to accept USB audio data. While waiting for the audio
data (that is, in an idle state), the analog output is set to bipolar zero (BPZ).
When receiving the audio data, the PCM2912A stores the first audio packet, which contains 1-ms audio data,
into the internal storage buffer. The PCM2912A starts playing the audio data when the subsequent Start of
Frame (SOF) packet is detected, as shown in Figure 33.
5.0 V (typ)
2.5 V (typ)
VBUS (pin 2)
0 V
Bus Reset
Set Configuration
1st Audio Data
2nd Audio Data
Bus Idle
D+ (pin 4),
D- (pin 3)
SOF
SOF
SOF
SSPND (pin 29)
VOUTL (pin 18),
VOUTR (pin 22)
700 ms
Device Setup
1 ms
Internal Reset
Ready for Setup
Ready for Playback
Figure 33. Initial Sequence
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Play, Stop, and Detach Sequence
When the host finishes or aborts the play back process, the PCM2912A stops playing after last audio data has
played, as shown in Figure 34.
VBUS (pin 2)
Audio Data
Audio Data
Last Audio Data
D+ (pin 4),
D- (pin 3)
SOF
SOF
SOF
SOF
SOF
VOUTL (pin 18),
VOUTR (pin 22)
1 ms
Detach
Figure 34. Play, Stop, and Detach
Record Sequence
Figure 35 illustrates how the PCM2912A records the audio into the internal memory after receiving the
SET_INTERFACE command.
SET_INTERFACE
IN token Audio data
IN token Audio data
IN token Audio data
D+ (pin 4),
D– (pin 3)
SOF
SOF
SOF
SOF
SOF
VIN (pin 16)
1ms
Figure 35. Record Sequence
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Suspend and Resume Sequence
The PCM2912A enters a suspend state when it sees a constant idle state on the USB bus after approximately 5
ms. When the PCM2912A enters the suspend state, the SSPND flag (pin 29) is asserted. The PCM2912A wakes
up immediately after detecting the non-idle state on the USB bus. Figure 36 illustrates these actions.
Idle
D+ (pin 4),
D- (pin 3)
SSPND (pin 29)
5 ms
Suspend
VOUTL (pin 18),
VOUTR (pin 22)
Active
2.5 ms
Active
Figure 36. Suspend and Resume
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TYPICAL CIRCUIT CONNECTION
A bus-powered (Hi-power), +20-dB microphone amplifier application example is shown in Figure 37.
Headphone
Microphone
R11
R10
R8
R7
R5
C13
C16
C10
C9
C11
24 23 22 21 20 19 18 17
C14
POWER
MBIAS
C17
VIN
16
15
14
13
12
11
PGND
25
26
27
28
29
30
31
VCCA
NC
VCCP
C8
TEST1
AGND
VCOM2
TEST0
PCM2912A
C7
C6
SSPND
VCOM1
MMUTE
REC
Mic Mute
FR 10
C5
C4
FL
9
32 PLAY
R13
R12
BGND
1
2
3
4
5
6
7
8
C18
L1
C1
R4
REC
PLAY
X1
C3
R1
R2 R3
C2
USB Connector
VBUS D– D+ GND
NOTE: X1: 6-MHz crystal resonator
C1, C8, C11, C14, C17, C18: 1 µF ceramic
C2, C3: 10 pF to 33 pF (depending on load capacitance of crystal resonator)
C4, C5: 100 pF ceramic
C6, C10: 3.3 µF
C7: 0.1 µF
C9: 0.22 µF electrolytic (depending on required frequency response for microphone input)
C13, C16: 100 µF electrolytic (depending on required frequency response for headphone output)
R1, R2: 22 Ω to 33 Ω
R3: 1.5 kΩ
R4: 1 MΩ
R5: 1 kΩ (depending on microphone characteristic)
R7, R8, R10, R11: 3.3 kΩ
R12, R13: 820 Ω (depending on LED drive current)
L1: 1 µH (DC resistance < 0.6 Ω)
It is possible to change maximum power if total power of actual application does not require over 100 mA (set
POWER = low to configure as low-power device).
Figure 37. USB Headset Application
NOTE:
The circuit in Figure 37 is for information only. Total board design should be
considered in order to meet the USB specification as a USB-compliant product.
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RELATED DOCUMENTATION FROM TEXAS INSTRUMENTS
For additional information concerning the PCM2912A device, see the TI application report, Operating
Envronments for PCM2912 Applications (SLAA387), available for download from www.ti.com.
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PACKAGE OPTION ADDENDUM
www.ti.com
22-Nov-2008
PACKAGING INFORMATION
Orderable Device
PCM2912APJT
PCM2912APJTR
Status (1)
ACTIVE
ACTIVE
Package Package
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
Qty
Type
Drawing
TQFP
PJT
32
250 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
TQFP
PJT
32
1000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
(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)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
Addendum-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
5-Dec-2008
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0 (mm)
B0 (mm)
K0 (mm)
P1
W
Pin1
Diameter Width
(mm) W1 (mm)
(mm) (mm) Quadrant
PCM2912APJTR
TQFP
PJT
32
1000
330.0
16.4
9.6
9.6
1.5
12.0
16.0
Q2
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
5-Dec-2008
*All dimensions are nominal
Device
Package Type Package Drawing Pins
TQFP PJT 32
SPQ
Length (mm) Width (mm) Height (mm)
346.0 346.0 33.0
PCM2912APJTR
1000
Pack Materials-Page 2
MECHANICAL DATA
MPQF112 – NOVEMBER 2001
PJT (S-PQFP–N32)
PLASTIC QUAD FLATPACK
0,45
0,30
0,80
M
0,20
0,20
0,09
Gage Plane
32
0,15
0,05
0,25
1
0°– 7°
7,00
9,00
SQ
SQ
0,75
0,45
1,05
0,95
Seating Plane
0,10
1,20
1,00
4203540/A 11/01
NOTES: A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice.
C. Falls within JEDEC MS-026
1
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