PCM2906CDB [TI]
Stereo Audio Codec with USB Interface, Single-Ended Analog Input/Output, and S/PDIF; 立体声音频编解码器采用USB接口，单端模拟输入/输出，以及S / PDIF
| 型号： | PCM2906CDB |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | Stereo Audio Codec with USB Interface, Single-Ended Analog Input/Output, and S/PDIF |
| 文件： | 总30页 (文件大小：630K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PCM2906C
www.ti.com
SBFS037 –NOVEMBER 2011
Stereo Audio Codec
with USB Interface, Single-Ended Analog Input/Output, and S/PDIF
Check for Samples: PCM2906C
1
FEATURES
•
Stereo DAC:
–
Analog Performance at VBUS = 5 V:
234
•
On-Chip USB Interface:
–
–
–
THD+N = 0.005%
SNR = 96 dB
–
–
–
–
–
–
With Full-Speed Transceivers
Fully Compliant with USB 2.0 Specification
Certified by USB-IF
Dynamic Range = 93 dB
–
Oversampling Digital Filter:
USB Adaptive Mode for Playback
USB Asynchronous Mode for Record
Bus Powered
–
–
Passband Ripple = ±0.1 dB
Stop-Band Attenuation = –43 dB
–
–
Single-Ended Voltage Output
Analog LPF Included
•
16-Bit Delta-Sigma ADC and DAC
Sampling Rate:
•
•
•
Multifunctions:
–
–
DAC: 32, 44.1, 48 kHz
–
Human Interface Device (HID) Function:
Volume and Mute Controls
Suspend Flag Function
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:
28-Pin SSOP Package
APPLICATIONS
–
5 V Typical (VBUS
)
•
•
•
•
USB Audio Speaker
USB Headset
•
Stereo ADC:
–
–
Analog Performance at VBUS = 5 V:
USB Monitor
–
–
–
THD+N = 0.01%
USB Audio Interface Box
SNR = 89 dB
Dynamic Range = 89 dB
DESCRIPTION
Decimation Digital Filter:
The PCM2906C is Texas Instruments' single-chip,
USB, stereo audio codec with a USB-compliant
full-speed protocol controller and S/PDIF. The USB
protocol controller requires no software code. The
PCM2906C 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.
–
–
Passband Ripple = ±0.05 dB
Stop-Band Attenuation = –65 dB
–
–
–
Single-Ended Voltage Input
Antialiasing Filter Included
Digital HPF Included
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.
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 © 2011, Texas Instruments Incorporated
PCM2906C
SBFS037 –NOVEMBER 2011
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.
PACKAGING/ORDERING INFORMATION(1)
SPECIFIED
TEMPERATURE
RANGE
TRANSPORT
MEDIA,
QUANTITY
PACKAGE
DESIGNATOR
PACKAGE
MARKING
ORDERING
NUMBER
PRODUCT
PACKAGE-LEAD
PCM2906CDB
Rails, 47
PCM2906CDB
SSOP-28
DB
–25°C to +85°C
PCM2906C
Tape and Reel,
2000
PCM2906CDBR
(1) 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
PCM2906C
–0.3 to 6.5
±0.1
UNIT
V
Supply voltage, VBUS
Ground voltage differences, AGNDC, AGNDP, AGNDX, DGND, DGNDU
V
SEL0, SEL1, DIN
Digital input voltage
–0.3 to 6.5
–0.3 to (VDDI + 0.3) < 4
–0.3 to (VCCCI + 0.3) < 4
–0.3 to 4
V
V
D+, D–, HID0, HID1, HID2, XTI, XTO, DOUT, SSPND
VINL, VINR, VCOM, VOUTR, VOUT
L
Analog input voltage
VCCCI, VCCP1I, VCCP2I, VCCXI, VDDI
Input current (any pins except supplies)
Ambient temperature under bias
Storage temperature, Tstg
±10
mA
°C
°C
°C
°C
°C
–40 to +125
–55 to +150
+150
Junction temperature, TJ
Lead temperature (soldering, 5s)
Package temperature (IR reflow, peak)
+260
+250
(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 is not implied. Exposure to
absolute-maximum-rated conditions for extended periods may affect device reliability.
THERMAL INFORMATION
PCM2906C
THERMAL METRIC(1)
DB (SSOP)
28 PINS
64.5
UNITS
θJA
Junction-to-ambient thermal resistance
θJCtop
θJB
Junction-to-case (top) thermal resistance
Junction-to-board thermal resistance
24.5
25.4
°C/W
ψJT
Junction-to-top characterization parameter
Junction-to-board characterization parameter
Junction-to-case (bottom) thermal resistance
2.0
ψJB
25.0
θJCbot
N/A
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
2
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SBFS037 –NOVEMBER 2011
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).
PCM2906C
PARAMETER
DIGITAL INPUT/OUTPUT
Host interface
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Apply USB Revision 2.0, full speed
USB isochronous data format
Audio data format
INPUT LOGIC
(1)
VIH
2
2.52
2
3.3
0.8
(1)
VIL
(2)(3)
VIH
3.3
(2)(3)
VIL
0.9
Input logic level
VDC
(4)
VIH
5.25
0.8
(4)
VIL
(5)
VIH
2.52
5.25
0.9
(5)
VIL
(1)(2)(4)
IIH
VIN = 3.3 V
VIN = 0 V
±10
±10
80
(1)(2)(4)
IIL
(3)
IIH
VIN = 3.3 V
VIN = 0 V
50
65
Input logic current
μA
(3)
IIL
±10
100
±10
(5)
IIH
VIN = 3.3 V
VIN = 0 V
(5)
IIL
OUTPUT LOGIC
(1)
VOH
2.8
2.8
2.8
(1)
VOL
0.3
0.5
(6)
VOH
IOH = –4 mA
IOL = 4 mA
IOH = –2 mA
IOL = 2 mA
Output logic level
VDC
MHz
(6)
VOL
(7)
VOH
(7)
VOL
0.5
CLOCK FREQUENCY
Input clock frequency, XTI
11.994
12
12.006
(1) Pins 1, 2: D+, D–.
(2) Pin 21: XTI.
(3) Pins 5, 6, 7: HID0, HID1, HID2.
(4) Pins 8, 9: SEL0, SEL1.
(5) Pin 24: DIN.
(6) Pin 25: DOUT.
(7) Pin 28: SSPND.
Copyright © 2011, 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).
PCM2906C
PARAMETER
ADC CHARACTERISTICS
Resolution
TEST CONDITIONS
MIN
TYP
MAX
UNIT
8, 16
1, 2
Bits
Audio data channel
Channel
ADC Clock Frequency
fs
ADC DC Accuracy
Gain mismatch,
Sampling frequency
8, 11.025, 16, 22.05, 32, 44.1, 48
kHz
±1
±5
% of FSR
channel-to-channel
Gain error
±2
±0
±10
% of FSR
% of FSR
Bipolar zero error
ADC Dynamic Performance(8)
VIN = –1 dB(9), VCCCI = 3.67 V
VIN = –1 dB(10)
VIN = –60 dB
0.01
0.1
5
0.02
%
%
Total harmonic distortion
plus noise
THD+N
%
Dynamic range
A-weighted
81
81
80
89
89
85
dB
dB
dB
SNR
Signal-to-noise ratio
Channel separation
A-weighted
Analog Input
Input voltage
0.6 VCCCI
0.5 VCCCI
30
VPP
V
Center voltage
Input impedance
kΩ
kHz
dB
–3 dB
150
Antialiasing filter frequency
response
fIN = 20 kHz
–0.08
ADC Digital Filter Performance
Passband
0.454 fs
Hz
Hz
dB
dB
s
Stop band
0.583 fs
Passband ripple
±0.05
Stop-band attenuation
–65
td
Delay time
17.4/fs
HPF frequency response
–3 dB
0.078fs/1000
Hz
(8) fIN = 1 kHz, using the System Two™ audio measurement system by Audio Precision™ in RMS mode with 20-kHz LPF, 400-Hz HPF in
calculation.
(9) Using external voltage regulator for VCCCI (see Figure 36).
(10) Using internal voltage regulator for VCCCI (see Figure 37).
4
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SBFS037 –NOVEMBER 2011
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).
PCM2906C
PARAMETER
DAC CHARACTERISTICS
Resolution
TEST CONDITIONS
MIN
TYP
MAX
UNIT
8, 16
1, 2
Bits
Audio data channel
Channel
DAC Clock Frequency
fs
DAC DC Accuracy
Gain mismatch,
Sampling frequency
32, 44.1, 48
kHz
±1
±5
% of FSR
channel-to-channel
Gain error
±2
±2
±10
% of FSR
% of FSR
Bipolar zero error
DAC Dynamic Performance(11)
VOUT = 0 dB
0.005
3
0.016
%
%
Total harmonic distortion
plus noise
THD+N
VOUT = –60 dB
Dynamic range
EIAJ, A-weighted
EIAJ, A-weighted
87
90
86
93
dB
dB
dB
SNR
Signal-to-noise ratio
Channel separation
96
92
Analog Output
VO Output voltage
0.6 VCCCI
0.5 VCCCI
VPP
V
Center voltage
Load impedance
AC coupling
–3 dB
10
kΩ
kHz
dB
250
LPF frequency response
f = 20 kHz
–0.03
DAC Digital Filter Performance
Passband
0.445 fs
Hz
Hz
dB
dB
s
Stop band
0.555 fs
Passband ripple
±0.1
Stop-band attenuation
–43
td
Delay time
14.3 fs
POWER-SUPPLY REQUIREMENTS
VBUS
Voltage range
Supply current
4.35
5
56
5.25
67
VDC
mA
ADC, DAC operation
Suspend mode(12)
ADC, DAC operation
Suspend mode(12)
250
280
1.25
μA
352
3.5
mW
mW
PD
Power dissipation
Internal power-supply
voltage(13)
3.1
3.3
VDC
TEMPERATURE RANGE
Operating temperature range
–25
+85
°C
(11) fOUT = 1 kHz, using the System Two audio measurement system by Audio Precision in RMS mode with 20-kHz LPF, 400-Hz HPF.
(12) In USB suspend state.
(13) Pins 10, 17, 19, 23, 27: VCCCI, VCCP1I, VCCP2I, VCCXI, VDDI
.
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PIN ASSIGNMENTS
DB PACKAGE
SSOP-28
(TOP VIEW)
D+
1
28
27
26
25
24
23
22
21
20
19
18
17
16
15
SSPND
VDDI
D–
2
VBUS
3
DGND
DGNDU
HID0
4
DOUT
DIN
5
VCCXI
HID1
6
HID2
7
AGNDX
SEL0
SEL1
VCCCI
8
XTI
9
XTO
VCCP2I
10
11
12
13
14
AGNDC
AGNDP
VCCP1I
VIN
VIN
VCOM
L
R
VOUT
L
VOUT
R
P0007-05
Table 1. TERMINAL FUNCTIONS
NAME
AGNDC
AGNDP
AGNDX
D–
NO.
11
18
22
2
I/O
—
—
—
I/O
I/O
—
—
I
DESCRIPTION
Analog ground for codec
Analog ground for PLL
Analog ground for oscillator
USB differential input/output minus(1)
USB differential input/output plus(1)
Digital ground
D+
1
DGND
DGNDU
DIN
26
4
Digital ground for USB transceiver
S/PDIF input(2)
24
25
5
DOUT
HID0
O
I
S/PDIF output
HID key state input (mute), active-high(3)
HID key state input (volume up), active-high(3)
HID key state input (volume down), active-high(3)
Must be set to high(4)
HID1
6
I
HID2
7
I
SEL0
SEL1
SSPND
VBUS
8
I
9
I
Must be set to high(4)
28
3
O
—
—
—
—
—
—
—
I
Suspend flag, active-low (Low: suspend, High: operational)
Connect to USB power (VBUS
)
VCCCI
VCCP1I
VCCP2I
VCCXI
VCOM
10
17
19
23
14
27
12
13
16
15
21
20
Internal analog power supply for codec(5)
Internal analog power supply for PLL(5)
Internal analog power supply for PLL(5)
Internal analog power supply for oscillator(5)
Common for ADC/DAC (VCCCI/2)(5)
Internal digital power supply(5)
VDDI
VIN
VIN
VOUT
VOUT
L
ADC analog input for L-channel
ADC analog input for R-channel
DAC analog output for L-channel
DAC analog output for R-channel
Crystal oscillator input(6)
R
I
L
O
O
I
R
XTI
XTO
O
Crystal oscillator output
(1) LV-TTL level.
(2) 3.3-V CMOS-level input with internal pulldown, 5-V tolerant.
(3) 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.
(4) TTL Schmitt trigger, 5-V tolerant.
(5) Connect a decoupling capacitor to GND.
(6) 3.3-V CMOS-level input.
6
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SBFS037 –NOVEMBER 2011
FUNCTIONAL BLOCK DIAGRAM
VCCCI VCCP1I VCCP2I VCCXI
VDDI
AGNDC AGNDP AGNDX
DGND
DGNDU
5-V to 3.3-V Voltage Regulator
Lock
Power
Manager
SSPND
VBUS
DIN
S/PDIF Decoder
VIN
VIN
L
ISO-In
End-Point
ADC
FIFO
R
D+
D–
Analog
PLL
Control
End-Point
VCOM
Selector
Analog
PLL
SEL0
SEL1
VOUT
L
ISO-Out
End-Point
DAC
FIFO
VOUTR
HID0
HID1
HID2
HID
End-Point
DOUT
S/PDIF Encoder
USB
Protocol
Controller
96 MHz
Tracker
(SpAct)
PLL (´8)
12 MHz
XTO
XTI
B0239-01
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BLOCK DIAGRAM OF ANALOG FRONT-END (RIGHT CHANNEL)
4.7 mF
30 kW
VIN
R
–
+
13
–
+
(+)
(–)
Delta-Sigma
Modulator
VCOM
14
(VCCCI/2)
+
10 mF
Reference
S0011-06
8
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SBFS037 –NOVEMBER 2011
TYPICAL CHARACTERISTICS: ADC
All specifications at TA = +25°C, VBUS = 5 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, using REG103xA-A, unless otherwise
noted.
TOTAL HARMONIC DISTORTION + NOISE AT –1 dB
DYNAMIC RANGE and SNR
vs
vs
FREE-AIR TEMPERATURE
FREE-AIR TEMPERATURE
0.010
95
93
91
89
87
85
0.009
0.008
0.007
0.006
0.005
0.004
0.003
Dynamic Range
SNR
−50
−25
0
25
50
75
100
−50
−25
0
25
50
75
100
T
A
– Free-Air Temperature – °C
T
A
– Free-Air Temperature – °C
G001
G002
Figure 1.
Figure 2.
TOTAL HARMONIC DISTORTION + NOISE AT –1 dB
DYNAMIC RANGE and SNR
vs
vs
SUPPLY VOLTAGE
SUPPLY VOLTAGE
0.010
95
93
91
89
87
85
0.009
0.008
0.007
0.006
0.005
0.004
0.003
Dynamic Range
SNR
4.0
4.5
5.0
5.5
4.0
4.5
5.0
5.5
V
BUS
– Supply Voltage – V
V
BUS
– Supply Voltage – V
G003
G004
Figure 3.
Figure 4.
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TYPICAL CHARACTERISTICS: ADC (continued)
All specifications at TA = +25°C, VBUS = 5 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, using REG103xA-A, unless otherwise
noted.
TOTAL HARMONIC DISTORTION + NOISE AT –1 dB
DYNAMIC RANGE and SNR
vs
vs
SAMPLING FREQUENCY
SAMPLING FREQUENCY
0.010
95
93
91
89
87
85
0.009
0.008
0.007
0.006
0.005
0.004
0.003
Dynamic Range
SNR
30
35
40
45
50
30
35
40
45
50
f
S
– Sampling Frequency – kHz
f
S
– Sampling Frequency – kHz
G005
G006
Figure 5.
Figure 6.
TYPICAL CHARACTERISTICS: DAC
All specifications at TA = +25°C, VBUS = 5 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, using REG103xA-A, unless otherwise
noted.
TOTAL HARMONIC DISTORTION + NOISE AT 0 dB
DYNAMIC RANGE and SNR
vs
vs
FREE-AIR TEMPERATURE
FREE-AIR TEMPERATURE
98
97
96
95
94
93
92
91
90
0.008
0.007
0.006
0.005
0.004
0.003
SNR
Dynamic Range
−50
−25
0
25
50
75
100
−50
−25
0
25
50
75
100
T
A
– Free-Air Temperature – °C
T
A
– Free-Air Temperature – °C
G008
G007
Figure 7.
Figure 8.
10
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SBFS037 –NOVEMBER 2011
TYPICAL CHARACTERISTICS: DAC (continued)
All specifications at TA = +25°C, VBUS = 5 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, using REG103xA-A, unless otherwise
noted.
TOTAL HARMONIC DISTORTION + NOISE AT 0 dB
DYNAMIC RANGE and SNR
vs
vs
SUPPLY VOLTAGE
SUPPLY VOLTAGE
98
97
96
95
94
93
92
91
90
0.008
0.007
0.006
0.005
0.004
0.003
SNR
Dynamic Range
4.0
4.5
5.0
5.5
4.0
4.5
5.0
5.5
V
BUS
– Supply Voltage – V
V
BUS
– Supply Voltage – V
G010
G009
Figure 9.
Figure 10.
TOTAL HARMONIC DISTORTION + NOISE AT 0 dB
DYNAMIC RANGE and SNR
vs
vs
SAMPLING FREQUENCY
SAMPLING FREQUENCY
98
97
96
95
94
93
92
91
90
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
S
– Sampling Frequency – kHz
f
S
– Sampling Frequency – kHz
G012
G011
Figure 11.
Figure 12.
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TYPICAL CHARACTERISTICS: SUPPLY CURRENT
All specifications at TA = +25°C, VBUS = 5 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, using REG103xA-A, unless otherwise
noted.
OPERATIONAL and SUSPEND SUPPLY CURRENT
vs
SUPPLY VOLTAGE
0.30
0.28
0.26
0.24
0.22
0.20
70
60
50
40
30
20
Operational
Suspend
4.00
4.25
4.50
4.75
5.00
5.25
5.50
V
BUS
– Supply Voltage – V
G013
Figure 13.
OPERATIONAL SUPPLY CURRENT
SUSPEND SUPPLY CURRENT
vs
vs
SAMPLING FREQUENCY
FREE-AIR TEMPERATURE
70
60
50
40
30
20
0.40
0.35
0.30
0.25
0.20
0.15
0.10
USB Spec Limit for Device (0.3 mA)
30
35
40
45
50
–40
–20
0
20
40
60
80
100
f
S
– Sampling Frequency – kHz
T
A
– Free-Air Temperature –°C
G014
G015
Figure 14.
Figure 15.
12
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TYPICAL CHARACTERISTICS: ADC DIGITAL DECIMATION FILTER FREQUENCY RESPONSE
All specifications at TA = +25°C, VBUS = 5 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted.
OVERALL CHARACTERISTICS
STOP-BAND ATTENUATION
0
−20
0
−10
−20
−30
−40
−50
−60
−70
−80
−90
−100
−40
−60
−80
−100
−120
−140
−160
0
8
16
24
32
0.0
0.2
0.4
0.6
0.8
1.0
Frequency [y f ]
Frequency [y f ]
S
S
G016
G017
Figure 16.
Figure 17.
PASSBAND RIPPLE
TRANSITION-BAND RESPONSE
0.2
0
−4
0.0
−0.2
−0.4
−0.6
−0.8
−8
−12
−16
−20
0.0
0.1
0.2
0.3
0.4
0.5
0.46
0.48
0.50
0.52
0.54
Frequency [y f ]
Frequency [y f ]
S
S
G018
G019
Figure 18.
Figure 19.
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TYPICAL CHARACTERISTICS: ADC DIGITAL HIGH-PASS FILTER FREQUENCY RESPONSE
All specifications at TA = +25°C, VBUS = 5 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted.
STOP-BAND CHARACTERISTICS
PASSBAND CHARACTERISTICS
0
−10
−20
−30
−40
−50
−60
−70
−80
−90
−100
0.0
−0.2
−0.4
−0.6
−0.8
−1.0
0.0
0.1
0.2
0.3
0.4
0
1
2
3
4
Frequency [y f /1000]
Frequency [y f /1000]
S
S
G020
G021
Figure 20.
Figure 21.
TYPICAL CHARACTERISTICS: ADC ANALOG ANTIALIASING FILTER FREQUENCY RESPONSE
All specifications at TA = +25°C, VBUS = 5 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted.
STOP-BAND CHARACTERISTICS
PASSBAND CHARACTERISTICS
0.0
−0.2
−0.4
−0.6
−0.8
−1.0
0
−10
−20
−30
−40
−50
0.01
0.1
1
10
100
1
10
100
1k
10k
f – Frequency – kHz
f − Frequency − kHz
G023
G022
Figure 22.
Figure 23.
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TYPICAL CHARACTERISTICS: DAC DIGITAL INTERPOLATION FILTER FREQUENCY
RESPONSE
All specifications at TA = +25°C, VBUS = 5 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted.
STOP-BAND ATTENUATION
PASSBAND RIPPLE
0
−10
−20
−30
−40
−50
−60
−70
−80
−90
−100
0.2
0.0
−0.2
−0.4
−0.6
−0.8
0
1
2
3
4
0.0
0.1
0.2
0.3
0.4
0.5
Frequency [y f ]
Frequency [y f ]
S
S
G024
G025
Figure 24.
Figure 25.
TRANSITION-BAND RESPONSE
0
−2
−4
−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 f ]
S
G026
Figure 26.
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TYPICAL CHARACTERISTICS: DAC ANALOG FIR FILTER FREQUENCY RESPONSE
All specifications at TA = +25°C, VBUS = 5 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted.
STOP-BAND CHARACTERISTICS
PASSBAND CHARACTERISTICS
0
−10
−20
−30
−40
−50
0.2
0.0
−0.2
−0.4
−0.6
−0.8
0
8
16
24
32
0.0
0.1
0.2
0.3
0.4
0.5
Frequency [y f ]
Frequency [y f ]
S
S
G027
G028
Figure 27.
Figure 28.
TYPICAL CHARACTERISTICS: DAC ANALOG LOW-PASS FILTER FREQUENCY RESPONSE
All specifications at TA = +25°C, VBUS = 5 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted.
STOP-BAND CHARACTERISTICS
PASSBAND CHARACTERISTICS
0.0
−0.2
−0.4
−0.6
−0.8
−1.0
0
−10
−20
−30
−40
−50
0.01
0.1
1
10
100
1
10
100
1k
10k
f – Frequency – kHz
f – Frequency – kHz
G030
G029
Figure 29.
Figure 30.
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DETAILED DESCRIPTION
USB INTERFACE
Control data and audio data are transferred to the PCM2906C via D+ (pin 1) and D– (pin 2). All data to/from the
PCM2906C are transferred at full speed. The device descriptor contains the information described in Table 2.
Table 2. Device Descriptor
USB revision
2.0 compliant
Device class
0x00 (device defined interface level)
0x00 (not specified)
0x00 (not specified)
8 byte
Device sub class
Device protocol
Max packet size for end-point 0
Vendor ID
0x08BB
Product ID
0x29C6
Device release number
Number of configurations
Vendor string
1.0 (0x0100)
1
String #1 (see Table 4)
String #2 (see Table 4)
Not supported
Product string
Serial number
The configuration descriptor contains the information described in Table 3.
Table 3. Configuration Descriptor
Interface
Four interfaces
Power attribute
Max power
0x80 (Bus powered, no remote wakeup)
0xFA (500 mA)
The string descriptor contains the information described in Table 4.
Table 4. String Descriptor
#0
#1
#2
0x0409
BurrBrown from Texas Instruments
USB AUDIO CODEC
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DEVICE CONFIGURATION
Figure 31 illustrates the USB audio function topology. The PCM2906C has four interfaces. Each interface
consists of alternative settings.
End-Point #0
Default End-Point
FU
Analog Out
End-Point #2
(IF #1)
IT
TID1
OT
TID2
Audio Streaming Interface
UID3
End-Point #4
(IF #2)
Analog In
OT
TID5
IT
TID4
Audio Streaming Interface
Standard Audio Control Interface (IF #0)
End-Point #5
(IF #3)
HID Interface
Device
M0024-02
Figure 31. 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 PCM2906C 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 a 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 line connector (terminal type 0x0603). 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 listed in
Table 5. Alternative setting #0 is the zero-bandwidth setting. All other alternative settings are operational settings.
Table 5. Interface #1 Alternative Settings
ALTERNATIVE
SETTING
TRANSFER
MODE
SAMPLING RATE
(kHz)
DATA FORMAT
00
01
02
03
04
Zero bandwidth
16-bit
16-bit
8-bit
Stereo
Mono
Stereo
Mono
Twos complement (PCM)
Twos complement (PCM)
Twos complement (PCM)
Twos complement (PCM)
Adaptive
Adaptive
Adaptive
Adaptive
32, 44.1, 48
32, 44.1, 48
32, 44.1, 48
32, 44.1, 48
8-bit
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Interface #2
Interface #2 is the audio streaming data-in interface. Interface #2 has the 19 alternative settings listed 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
TRANSFER
MODE
SAMPLING RATE
(kHz)
DATA FORMAT
00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
10
11
12
Zero Bandwidth
16-bit
16-bit
16-bit
16-bit
16-bit
16-bit
16-bit
16-bit
16-bit
16-bit
8-bit
Stereo
Mono
Stereo
Mono
Stereo
Mono
Stereo
Mono
Stereo
Mono
Stereo
Mono
Stereo
Mono
Stereo
Mono
Stereo
Mono
Twos complement (PCM)
Twos complement (PCM)
Twos complement (PCM)
Twos complement (PCM)
Twos complement (PCM)
Twos complement (PCM)
Twos complement (PCM)
Twos complement (PCM)
Twos complement (PCM)
Twos complement (PCM)
Twos complement (PCM)
Twos complement (PCM)
Twos complement (PCM)
Twos complement (PCM)
Twos complement (PCM)
Twos complement (PCM)
Twos complement (PCM)
Twos complement (PCM)
Asynchronous
Asynchronous
Asynchronous
Asynchronous
Asynchronous
Asynchronous
Asynchronous
Asynchronous
Asynchronous
Asynchronous
Asynchronous
Asynchronous
Asynchronous
Asynchronous
Synchronous
Synchronous
Synchronous
Synchronous
48
48
44.1
44.1
32
32
22.05
22.05
16
16
16
8-bit
16
8-bit
8
8-bit
8
16-bit
16-bit
8-bit
11.025
11.025
11.025
11.025
8-bit
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 PCM2906C 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
PCM2906C by the standard USB request and 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 the asynchronous transfer mode. The HID end-point is an interrupt-in end-point. The HID
end-point 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 PCM2906C requires a 12-MHz (±500 ppm) clock for the USB and audio functions. The clock can be
generated by a built-in oscillator with a 12-MHz crystal resonator. The 12-MHz crystal resonator must be
connected to XTI (pin 21) and XTO (pin 20) with one high-value (1-MΩ) resistor and two small capacitors, the
capacitance of which depends on the load capacitance of the crystal resonator. An external clock can be
supplied to XTI (pin 21). If an external clock is used, XTO (pin 20) must be left open. Because there is no clock
disabling signal, use of the external clock supply is not recommended. SSPND (pin 28) is unable to use clock
disabling.
The PCM2906C has an internal power-on reset circuit, which triggers automatically when VBUS (pin 3) 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 PCM2906 employs S/PDIF for both 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 from either the S/PDIF or ADC analog input.
When the device detects S/PDIF input and successfully locks the received data, the isochronous-in transfer data
source automatically selected is S/PDIF; 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 S/PDIF for input and output. All other data formats are unusable as
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 the 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 PCM2906C is ready for setup when the reset sequence has finished and the USB device is attached. After a
connection has been established by setup, the PCM2906C is ready to accept USB audio data. While waiting for
the audio data (idle state), the analog output is set to bipolar zero (BPZ).
When receiving the audio data, the PCM2906C stores the first audio packet, which contains 1-ms audio data,
into the internal storage buffer. The PCM2906C starts playing the audio data when detecting the next
start-of-frame (SOF) packet, as illustrated in Figure 32.
5 V (Typ)
VBUS (Pin 3)
2.5 V (Typ)
0 V
Bus Reset
Set Configuration
1st Audio Data
2nd Audio Data
Bus Idle
D+/D–
SOF
SOF
SOF
SSPND
BPZ
VOUT
L
VOUTR
700 ms
Device Setup
1 ms
Ready for Playback
Internal Reset
Ready for Setup
T0055-02
Figure 32. Initial Sequence
Play, Stop, and Detach Sequence
When the host finishes or aborts the playback, the PCM2906C stops playing after the last audio data have
played, as shown in Figure 33.
VBUS (Pin 3)
Audio Data
Audio Data
Last Audio Data
D+/D–
SOF
SOF
SOF
SOF
SOF
VOUT
L
VOUTR
Detach
1 ms
T0056-02
Figure 33. Play, Stop, and Detach Sequence
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Record Sequence
The PCM2906C starts audio capture into the internal memory after receiving the SET_INTERFACE command,
as shown in Figure 34.
Audio Data
Audio Data
Audio Data
SET_INTERFACE
IN Token
IN Token
IN Token
D+/D–
SOF
SOF
SOF
SOF
SOF
VIN
VIN
L
R
1 ms
T0259-01
Figure 34. Record Sequence
Suspend and Resume Sequence
The PCM2906C enters the suspend state after a constant idle state on the USB bus (approximately 5 ms), as
shown in Figure 35. While the PCM2906C enters the suspend state, the SSPND flag (pin 28) is asserted. The
PCM2906C wakes up immediately upon detecting a non-idle state on the USB.
Idle
D+/D–
SSPND
Suspend
Active
5 ms
Active
T0057-02
Figure 35. Suspend and Resume Sequence
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APPLICATION INFORMATION
TYPICAL CIRCUIT CONNECTION 1
Figure 36 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.
1.5 kW ´ 3
1.5 kW
Device
22 W
22 W
D+
1
2
D+
28
27
SSPND
VDDI
C3
D–
D–
2.2 W
1 mF
VBUS
VBUS
3
DGND 26
DOUT 25
DIN 24
GND
4
DGNDU
HID0
5
C4
VCCXI
6
HID1
23
7
HID2
AGNDX 22
XTI 21
C5
C6
1 MW
IC1
IN OUT GND ADJ EN
8
SEL0
1
2
3
4
5
9
SEL1
VCCCI
XTO 20
3.60 V–
3.85 V
12 MHz
C7
VCCP2I
AGNDP 18
10
19
MUTE/
Power
Down
+
C13
C9
C10
D1
11 AGNDC
C1
C8
VIN
VIN
L
VCCP1I
VOUT
VOUT
12
13
14
17
16
15
+
+
27 kW 13 kW
C11
C12
LPF,
Amp
+
+
R
L
C2
+
VCOM
R
LPF,
Amp
S0264-02
NOTE: C1, C2: 10 μF
C3, C4, C7, C8, C13: 1 μF (These capacitors must be less than 2 μF.)
C5, C6: 10 pF to 33 pF (depending on crystal resonator)
C9, C10, C11, C12: The capacitance may vary depending on design.
IC1: REG103xA-A (TI) or equivalent. Analog performance may vary depending on IC1.
D1: Schottky barrier diode (VF ≤ 350 mV at 10 mA, IR ≤ 2 μA at 4 V)
Figure 36. Bus-Powered Configuration for High-Performance Application
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TYPICAL CIRCUIT CONNECTION 2
Figure 37 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.
1.5 kW ´ 4
Device
22 W
D+
1
2
D+
28
27
SSPND
VDDI
22 W
C3
D–
D–
2.2 W
1 mF
VBUS
VBUS
3
DGND 26
DOUT 25
DIN 24
GND
4
DGNDU
HID0
5
C4
VCCXI
6
HID1
23
7
HID2
AGNDX 22
XTI 21
C5
C6
C7
1 MW
8
SEL0
9
SEL1
VCCCI
XTO 20
12 MHz
C1
VCCP2I
AGNDP 18
10
19
MUTE/
Power
Down
+
11 AGNDC
C9
C8
VIN
VIN
L
VCCP1I
VOUT
VOUT
12
13
14
17
16
15
+
+
C10
C11
C12
LPF,
Amp
+
+
R
L
C2
+
VCOM
R
LPF,
Amp
S0265-02
NOTE: C1, C2: 10 μF
C3, C4, C7, C8: 1 μF (These capacitors must be less than 2 μF.)
C5, C6: 10 pF to 33 pF (depending on crystal resonator)
C9, C10, C11, C12: The capacitance may vary depending on design.
In this case, the analog performance of the ADC may be degraded.
Figure 37. Bus-Powered Configuration
OPERATING ENVIRONMENT
For current information on the PCM2906C 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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26-Mar-2012
PACKAGING INFORMATION
Status (1)
Eco Plan (2)
MSL Peak Temp (3)
Samples
Orderable Device
Package Type Package
Drawing
Pins
Package Qty
Lead/
Ball Finish
(Requires Login)
PCM2906CDB
ACTIVE
ACTIVE
SSOP
SSOP
DB
DB
28
28
50
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-1-260C-UNLIM
PCM2906CDBR
2000
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-1-260C-UNLIM
(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
17-May-2012
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
B0
K0
P1
W
Pin1
Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant
(mm) W1 (mm)
PCM2906CDBR
SSOP
DB
28
2000
330.0
16.4
8.2
10.5
2.5
12.0
16.0
Q1
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
17-May-2012
*All dimensions are nominal
Device
Package Type Package Drawing Pins
SSOP DB 28
SPQ
Length (mm) Width (mm) Height (mm)
346.0 346.0 33.0
PCM2906CDBR
2000
Pack Materials-Page 2
MECHANICAL DATA
MSSO002E – JANUARY 1995 – REVISED DECEMBER 2001
DB (R-PDSO-G**)
PLASTIC SMALL-OUTLINE
28 PINS SHOWN
0,38
0,22
0,65
28
M
0,15
15
0,25
0,09
5,60
5,00
8,20
7,40
Gage Plane
1
14
0,25
A
0°–ā8°
0,95
0,55
Seating Plane
0,10
2,00 MAX
0,05 MIN
PINS **
14
16
20
24
28
30
38
DIM
6,50
5,90
6,50
5,90
7,50
8,50
7,90
10,50
9,90
10,50 12,90
A MAX
A MIN
6,90
9,90
12,30
4040065 /E 12/01
NOTES: A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice.
C. Body dimensions do not include mold flash or protrusion not to exceed 0,15.
D. Falls within JEDEC MO-150
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相关型号：
PCM2906DBRG4
Stereo USB1.1 CODEC with line-out and S/PDIF I/O, Bus-powered (HID Interface + 500mA USB Current) 28-SSOP
TI
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