PCM2906DBRG4中文资料
Burr?Brown Products
from Texas Instruments
FEATURES
APPLICATIONS
DESCRIPTION
PCM2904
PCM2906
SLES042C–JUNE2002–REVISED NOVEMBER2007 STEREO AUDIO CODEC WITH USB INTERFACE,SINGLE-ENDED ANALOG
INPUT/OUTPUT AND S/PDIF
–Pass-Band Ripple=±0.1dB
?PCM2904:Without S/PDIF–Stop-Band Attenuation=–43dB
?PCM2906:With S/PDIF–Single-Ended Voltage Output
?On-Chip USB Interface:–Analog LPF Included –With Full-Speed Transceivers?Multifunctions:
–Fully Compliant With USB1.1Specification–Human Interface Device(HID)Volume±
Control and Mute Control –Certified by USB-IF
–Suspend Flag
–Partially Programmable Descriptors(1)
?Package:28-Pin SSOP
–USB Adaptive Mode for Playback
–USB Asynchronous Mode for Record
–Bus Powered
?USB Audio Speaker
?16-Bit Delta-Sigma ADC and DAC?USB Headset
?Sampling Rate:?USB Monitor
–DAC:32,44.1,48kHz?USB Audio Interface Box
–ADC:8,11.025,16,22.05,32,44.1,48kHz
?On-Chip Clock Generator With Single12-MHz
Clock Source The PCM2904/2906is Texas Instruments single-chip ?Single Power Supply:5V Typical(V BUS)USB stereo audio codec with USB-compliant
full-speed protocol controller and S/PDIF(PCM2906?Stereo ADC
only).The USB protocol controller works with no –Analog Performance at V BUS=5V software code,but the USB descriptors can be
–THD+N=0.01%modified in some areas(for example,vendor
ID/product ID).The PCM2904/2906employs SpAct?–SNR=89dB
architecture,TI's unique system that recovers the –Dynamic Range=89dB audio clock from USB packet data.On-chip analog
–Decimation Digital Filter PLLs with SpAct enable playback and record with low
clock jitter and with independent playback and record –Pass-Band Ripple=±0.05dB
sampling rates.
–Stop-Band Attenuation=–65dB
–Single-Ended Voltage Input
–Antialiasing Filter Included
–Digital LCF Included
?Stereo DAC:
–Analog Performance at V BUS=5V
–THD+N=0.005%
–SNR=96dB
–Dynamic Range=93dB
–Oversampling Digital Filter
(1)The descriptor can be modified by changing a mask.
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.
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ABSOLUTE MAXIMUM RATINGS
PCM2904PCM2906
SLES042C–JUNE 2002–REVISED NOVEMBER 2007
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
SPECIFIED PACKAGE PACKAGE ORDERING TRANSPORT PRODUCT
PACKAGE-LEAD
TEMPERATURE
DESIGNATOR
MARKING NUMBER MEDIA
RANGE PCM2904DB Rails PCM2904DB 28-lead SSOP 28DB –25°C to 85°C PCM2904PCM2904DBR Tape and reel
PCM2906DB Rails PCM2906DB
28-lead SSOP
28DB
–25°C to 85°C
PCM2906
PCM2906DBR
Tape and reel
over operating free-air temperature range (unless otherwise noted)(1)
PCM2904/PCM2906
UNIT Supply voltage,V BUS
–0.3to 6.5V Ground voltage differences,AGNDC,AGNDP,AGNDX,DGND,DGNDU ±0.1V SEL0,SEL1,TEST0(DIN)
(2)
–0.3to 6.5
Digital input V voltage D+,D–,HID0,HID1,HID2,XTI,XTO,TEST1(DOUT)(2)
,SSPND
–0.3to (V DDI +0.3)<4V IN L,V IN R,V COM ,V OUT R,V OUT L –0.3to (V CCCI +0.3)<4
Analog input V voltage
V CCCI ,V CCP1I ,V CCP2I ,V CCXI ,V DDI
–0.3to 4Input current (any pins except supplies)±10mA Ambient temperature under bias –40to 125°C Storage temperature,T stg –55to 150
°C Junction temperature,T J 150°C Lead temperature (soldering)
260°C,5s Package temperature (IR reflow,peak)250
°C
(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)
():PCM2906
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ELECTRICAL CHARACTERISTICS
PCM2904
PCM2906 SLES042C–JUNE2002–REVISED NOVEMBER2007
All specifications at T A=25°C,V BUS,=5V,f S=44.1kHz,f IN=1kHz,16-bit data(unless otherwise noted)
PCM2904DB,PCM2906DB
PARAMETER TEST CONDITIONS UNIT
MIN TYP MAX
DIGITAL INPUT/OUTPUT
Host interface Apply USB Revision1.1,full speed
Audio data format USB isochronous data format
INPUT LOGIC
V IH(1)2 3.3
V IL(1)0.8
V IH(2)(3) 2.52 3.3
V IL(2)(3)0.9 Input logic level Vdc
V IH(4)2 5.25
V IL(4)0.8
V IH(5) 2.52 5.25
V IL(5)0.9
I IH(1)(2)(4)V IN=3.3V±10
I IL(1)(2)(4)V IN=0V±10
I IH(3)V IN=3.3V5080
Input logic currentμA
I IL(3)V IN=0V±10
I IH(5)V IN=3.3V65100
I IL(5)V IN=0V±10
OUTPUT LOGIC
V OH(1) 2.8
V OL(1)0.3
V OH(6)I OH=–4mA 2.8
Output logic level Vdc
V OL(6)I OL=4mA0.5
V OH(7)I OH=–2mA 2.8
V OL(7)I OL=2mA0.5
CLOCK FREQUENCY
Input clock frequency,XTI11.9941212.006MHz ADC CHARACTERISTICS
Resolution8,16bits
Audio data channel1,2channel CLOCK FREQUENCY
8,11.025,16,22.05,32,
f s Samplin
g frequency kHz
44.1,48
DC ACCURACY
Gain mismatch,channel-to-channel±1±5%of FSR
Gain error±2±10%of FSR
Bipolar zero error±0%of FSR
(1)Pins1,2:D+,D–
(2)Pin21:XTI
(3)Pins5,6,7:HID0,HID1,HID2
(4)Pins8,9:SEL0,SEL1
(5)Pin24:DIN
(6)Pin25:DOUT
(7)Pin28:SSPND
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ELECTRICAL CHARACTERISTICS (Continued)
PCM2904PCM2906
SLES042C–JUNE 2002–REVISED NOVEMBER 2007
All specifications at T A =25°C,V BUS ,=5V,f S =44.1kHz,f IN =1kHz,16-bit data (unless otherwise noted)
TEST CONDITIONS
PCM2904DB,PCM2906DB PARAMETER
UNIT
MIN
TYP
MAX
DYNAMIC PERFORMANCE (1)
V IN =–0.5dB (2),V CCCI =3.67V
0.01%0.02%
THD+N
Total harmonic distortion plus noise V IN =–0.5dB (3)0.1%V IN =–60dB 5%Dynamic range A-weighted 8189dB S/N ratio
A-weighted
8189dB Channel separation
80
85
dB
ANALOG INPUT
Input voltage 0.6V CCCI Vp-p Center voltage 0.5V CCCI
V Input impedance
30k ?–3dB 150kHz Antialiasing filter frequency response
f IN =20kHz
–0.08
dB
DIGITAL FILTER PERFORMANCE
Pass band 0.454f s
Hz Stop band 0.583f s
Hz Pass-band ripple ±0.05dB Stop-band attenuation
–65
dB t d
Delay time
17.4/f s s LCF frequency response
–3dB
0.078fs
MHz
DAC CHARACTERISTICS
Resolution 8,16bits Audio data channel
1,2
channel
CLOCK FREQUENCY f s
Sampling frequency
32,44.1,48
kHz DC ACCURACY
Gain mismatch,channel-to-channel ±1±5%of FSR Gain error ±2±10
%of FSR Bipolar zero error
±2
%of FSR
DYNAMIC PERFORMANCE (4)V OUT =0dB 0.005%
0.016%
THD+N
Total harmonic distortion plus noise V OUT =–60dB 3%Dynamic range
EIAJ,A-weighted 8793dB SNR
Signal-to-noise ratio EIAJ,A-weighted
9096dB Channel separation
86
92
dB
(1)f IN =1kHz,using the System Two?audio measurement system by Audio Precision?in RMS mode with 20-kHz LPF,400-Hz HPF in calculation.
(2)Using external voltage regulator for V CCCI (as shown in Figure 36and Figure 37,using REG103xA-A)(3)Using internal voltage regulator for V CCCI (as shown in Figure 38Figure 39)
(4)
f OUT =1kHz,usin
g the System Two audio measurement system by Audio Precision in RMS mode wit
h 20-kHz LPF,400-Hz HPF.
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ELECTRICAL CHARACTERISTICS(Continued) PIN ASSIGNMENTS
1 2 3 4 5 6 7 8 9 10 11 12 13 1428 27 26 25 24 23 22 21 20 19 18 17 16 15
D+
D–
V
BUS DGNDU
HID0
HID1
HID2
SEL0
SEL1
V
CCCI AGNDC
V L
IN
V R
IN
V
COM
SSPND
TEST0
V
CCXI
AGNDX
XTO
V
CCP2I
DGND
V
CCP1I
V L
OUT
XTI
TEST1
V
DDI
AGNDP
V R
OUT
PCM2904
(Top View)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
D+
D–
V
BUS
DGNDU
HID0
HID1
HID2
SEL0
SEL1
V
CCCI
AGNDC
V L
IN
V R
IN
V
COM
SSPND
DIN
V
CCXI
AGNDX
XTO
V
CCP2I
DGND
V
CCP1I
V L
OUT
XTI
DOUT
V
DDI
AGNDP
V R
OUT
P0007-05
PCM2906
(Top View)
PCM2904
PCM2906
SLES042C–JUNE2002–REVISED NOVEMBER2007
All specifications at T A=25°C,V BUS,=5V,f S=44.1kHz,f IN=1kHz,16-bit data(unless otherwise noted)
PCM2904DB,PCM2906DB PARAMETER TEST CONDITIONS UNIT
MIN TYP MAX
ANALOG OUTPUT
V O Output voltage0.6V CCCI Vp-p Center voltage0.5V CCCI V
Load impedance AC coupling10k?
–3dB250kHz LPF frequency response
f=20kHz–0.03dB DIGITAL FILTER PERFORMANCE
Pass band0.445f s Hz
Stop band0.555f s Hz
Pass-band ripple±0.1dB
Stop-band attenuation–43dB
t d Delay time14.3f s s POWER SUPPLY REQUIREMENTS
V BUS Voltage range 4.365 5.25VDC
ADC,DAC operation5667mA Supply current
Suspend mode(1)210μA
ADC,DAC operation280352
P D Power dissipation mW
Suspend mode(1) 1.05 Internal power supply voltage(2) 3.25 3.35 3.5VDC TEMPERATURE RANGE
Operating temperature–2585°C
θJA Thermal resistance28-pin SSOP100°C/W
(1)In USB suspend state
(2)Pins10,17,19,23,27:V CCCI,V CCP1I,V CCP2I,V CCXI,V DDI
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PCM2904PCM2906
SLES042C–JUNE 2002–REVISED NOVEMBER 2007
Table 1.PCM2904TERMINAL FUNCTIONS
TERMINAL
I/O DESCRIPTION
NAME NO.AGNDC 11–Analog ground for codec AGNDP 18–Analog ground for PLL AGNDX 22–Analog ground for oscillator
D–2I/O USB differential input/output minus (1)D+1I/O USB differential input/output plus (1)DGND 26–Digital ground
DGNDU 4–Digital ground for USB transceiver HID05I HID key state input (mute),active-high (2)HID16I HID key state input (volume up),active-high (2)HID27I HID key state input (volume down),active-high (2)SEL08I Must be set to high (3)SEL19I Must be set to high (3)
SSPND 28O Suspend flag,active-low (Low:suspend,High:operational)TEST024I Test pin,must be connected to GND TEST125O Test pin,must be left open V BUS 3–Connect to USB power (V BUS )
V CCCI 10–Internal analog power supply for codec (4)V CCP1I 17–Internal analog power supply for PLL (4)V CCP2I 19–Internal analog power supply for PLL (4)V CCXI 23–Internal analog power supply for oscillator (4)V COM 14–Common for ADC/DAC (V CCCI /2)(4)V DDI 27–Internal digital power supply (4)V IN L 12I ADC analog input for L-channel V IN R 13I ADC analog input for R-channel V OUT L 16O DAC analog output for L-channel V OUT R 15O DAC analog output for R-channel XTI 21I Crystal oscillator input (5)XTO 20
O
Crystal oscillator output
(1)LV-TTL leveL
(2) 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 #3and End-Points sections .(3)TTL Schmitt trigger,5-V tolerant
(4)Connect a decoupling capacitor to GND.(5)
3.3-V CMOS-level input
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PCM2904
PCM2906
SLES042C–JUNE2002–REVISED NOVEMBER2007 Table2.PCM2906TERMINAL FUNCTIONS
TERMINAL
I/O DESCRIPTION
NAME NO.
AGNDC11–Analog ground for codec
AGNDP18–Analog ground for PLL
AGNDX22–Analog ground for oscillator
D–2I/O USB differential input/output minus(1)
D+1I/O USB differential input/output plus(1)
DGND26–Digital ground
DGNDU4–Digital ground for USB transceiver
DIN24I S/PDIF input(2)
DOUT25O S/PDIF output
HID05I HID key state input(mute),active-high(3)
HID16I HID key state input(volume up),active-high(3)
HID27I HID key state input(volume down),active-high(3)
SEL08I Must be set to high(4)
SEL19I Must be set to high(4)
SSPND28O Suspend flag,active-low(Low:suspend,High:operational)
V BUS3–Connect to USB power(V BUS)
V CCCI10–Internal analog power supply for codec(5)
V CCP1I17–Internal analog power supply for PLL(5)
V CCP2I19–Internal analog power supply for PLL(5)
V CCXI23–Internal analog power supply for oscillator(5)
V COM14–Common for ADC/DAC(V CCCI/2)(5)
V DDI27–Internal digital power supply(5)
V IN L12I ADC analog input for L-channel
V IN R13I ADC analog input for R-channel
V OUT L16O DAC analog output for L-channel
V OUT R15O DAC analog output for R-channel
XTI21I Crystal oscillator input(6)
XTO20O 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#3and End-Points sections.
(4)TTL Schmitt trigger,5-V tolerant
(5)Connect a decoupling capacitor to GND.
(6) 3.3-V CMOS-level input
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PCM2904FUNCTIONAL BLOCK DIAGRAM
SSPND
TEST1
V L
IN V R
IN V COM
V L
OUT V R
OUT XTI
XTO
D+D–
SEL0SEL1
HID0HID1HID2
V BUS
V CCCI
V CCP1I
V CCP2I
V CCXI
V DDI
DGNDU
DGND
AGNDX
AGNDP
AGNDC
B0238-01
TEST0PCM2904PCM2906
SLES042C–JUNE 2002–REVISED NOVEMBER 2007
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PCM2906FUNCTIONAL BLOCK DIAGRAM
SSPND
DIN V L
IN V R
IN V COM
V L
OUT V R
OUT DOUT XTI
XTO
D+D–
SEL0SEL1
HID0HID1HID2
V BUS
V CCCI
V CCP1I
V CCP2I
V CCXI
V DDI
DGNDU
DGND
AGNDX
AGNDP
AGNDC
B0239-01
PCM2904PCM2906
SLES042C–JUNE 2002–REVISED NOVEMBER 2007
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BLOCK DIAGRAM OF ANALOG FRONT-END (RIGHT CHANNEL)
S0011-06
PCM2904PCM2906
SLES042C–JUNE 2002–REVISED NOVEMBER 2007
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TYPICAL CHARACTERISTICS
ADC
8587
89
91
93
95
?50
?250255075100
T A – Free-Air Temperature – °C
D y n a m i c R a n g e a n d S N R – d B
G002
0.003
0.0040.0050.0060.0070.0080.0090.010
?50
?250255075
100
T A – Free-Air Temperature – °C T H D +N – T o t a l H a r m o n i c D i s t o r t i o n + N o i s e – %
G001
0.003
0.0040.0050.0060.0070.0080.0090.010
4.0
4.5
5.0
5.5
V BUS – Supply Voltage – V T H D +N – T o t a l H a r m o n i c D i s t o r t i o n + N o i s e – %
G003
8587
89
91
93
95
4.0
4.5
5.0 5.5
V BUS – Supply Voltage – V
D y n a m i c R a n g e a n d S N R – d B
G004
PCM2904PCM2906
SLES042C–JUNE 2002–REVISED NOVEMBER 2007
All specifications at T A =25°C,V BUS =5V,f s =44.1kHz,f IN =1kHz,16-bit data,using REG103xA-A,unless otherwise noted.
TOTAL HARMONIC DISTORTION +NOISE
DYNAMIC RANGE and SNR
vs
vs
FREE-AIR TEMPERATURE
FREE-AIR TEMPERATURE
Figure 1.THD+N at –0.5dB vs Temperature Figure 2.
TOTAL HARMONIC DISTORTION +NOISE
DYNAMIC RANGE and SNR
vs
vs
SUPPLY VOLTAGE
SUPPLY VOLTAGE
Figure 3.THD+N at –0.5dB vs Supply Voltage Figure 4.
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0.003
0.0040.0050.0060.0070.0080.0090.010
30
35
40
45
50
f S – Samplin
g Frequency – kHz
T H D +N – T o t a l H a r m o n i c D i s t o r t i o n + N o i s e – %
G005
8587
89
91
93
95
30
35
40
45
50
f S – Samplin
g Frequency – kHz
D y n a m i c R a n g e a n d S N R – d B
G006
DAC
9091
929394959697
98?50
?250255075100
T A – Free-Air Temperature – °C
D y n a m i c R a n g e a n d S N R – d B
G008
0.003
0.004
0.005
0.006
0.007
0.008
?50
?250255075
100
T A – Free-Air Temperature – °C T H D +N – T o t a l H a r m o n i c D i s t o r t i o n + N o i s e – %
G007
PCM2904PCM2906
SLES042C–JUNE 2002–REVISED NOVEMBER 2007
TYPICAL CHARACTERISTICS (continued)
All specifications at T A =25°C,V BUS =5V,f s =44.1kHz,f IN =1kHz,16-bit data,using REG103xA-A,unless otherwise noted.
TOTAL HARMONIC DISTORTION +NOISE
DYNAMIC RANGE and SNR
vs
vs
SAMPLING FREQUENCY
SAMPLING FREQUENCY
Figure 5.THD+N at –0.5dB vs Sampling Frequency
Figure 6.
TOTAL HARMONIC DISTORTION +NOISE
DYNAMIC RANGE and SNR
vs
vs
FREE-AIR TEMPERATURE
FREE-AIR TEMPERATURE
Figure 7.THD+N at 0dB vs Temperature
Figure 8.
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0.003
0.004
0.005
0.006
0.007
0.0084.0
4.5
5.0
5.5
V BUS – Supply Voltage – V
T H D +N – T o t a l H a r m o n i c D i s t o r t i o n + N o i s e – %
G009
9091
929394959697
984.0
4.5
5.0 5.5
V BUS – Supply Voltage – V
D y n a m i c R a n g e a n d S N R – d B
G010
9091
929394
959697
9830
35
40
45
50
f S – Samplin
g Frequency – kHz
D y n a m i c R a n g e a n d S N R – d B
G012
0.003
0.004
0.005
0.006
0.007
0.008
30
35
40
45
50
f S – Samplin
g Frequency – kHz
T H D +N – T o t a l H a r m o n i c D i s t o r t i o n + N o i s e – %
G011
PCM2904PCM2906
SLES042C–JUNE 2002–REVISED NOVEMBER 2007
TYPICAL CHARACTERISTICS (continued)
All specifications at T A =25°C,V BUS =5V,f s =44.1kHz,f IN =1kHz,16-bit data,using REG103xA-A,unless otherwise noted.
TOTAL HARMONIC DISTORTION +NOISE
DYNAMIC RANGE and SNR
vs
vs
SUPPLY VOLTAGE
SUPPLY VOLTAGE
Figure 9.THD+N at 0dB vs Supply Voltage Figure 10.
TOTAL HARMONIC DISTORTION +NOISE
DYNAMIC RANGE and SNR
vs
vs
SAMPLING FREQUENCY
SAMPLING FREQUENCY
Figure 11.THD+N at 0dB vs Sampling Frequency
Figure 12.
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SUPPLY CURRENT
0.200.22
0.24
0.26
0.28
0.30
I C C – S u s p e n d S u p p l y C u r r e n t – m A
203040
50
60
70
4.00
4.25 4.50 4.75
5.00 5.25
5.50
V BUS – Supply Voltage – V
I C C – O p e r a t i o n a l S u p p l y C u r r e n t – m A
G013
2030
40
50
60
70
30
35
40
45
50
f S – Samplin
g Frequency – kHz I C C – O p e r a t i o n a l S u p p l y C u r r e n t – m A
G014
0.10
0.15
0.20
0.25
0.30
0.35
0.40
?40
?20020
406080100
T A – Free-Air Temperature – °C
I C C – S u s p e n d S u p p l y C u r r e n t – m A
G015
PCM2904PCM2906
SLES042C–JUNE 2002–REVISED NOVEMBER 2007
TYPICAL CHARACTERISTICS (continued)
All specifications at T A =25°C,V BUS =5V,f s =44.1kHz,f IN =1kHz,16-bit data,using REG103xA-A,unless otherwise noted.
OPERATIONAL and SUSPEND SUPPLY CURRENT
vs
SUPPLY VOLTAGE
Figure 13.
OPERATIONAL SUPPLY CURRENT
SUSPEND SUPPLY CURRENT
vs
vs
SAMPLING FREQUENCY
FREE-AIR TEMPERATURE
Figure 14.Supply Current vs Sampling Frequency,
Figure 15.Supply Current vs Temperature in
ADC and DAC at Same f S
Suspend Mode
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ADC DIGITAL DECIMATION FILTER FREQUENCY RESPONSE
?160
?140?120
?100?80?60?40
?200
A m p l i t u d e – d B
G016
?100
?90?80
?70?60?50?40?30
?20?100A m p l i t u d e – d B
G017
PCM2904PCM2906
SLES042C–JUNE 2002–REVISED NOVEMBER 2007
TYPICAL CHARACTERISTICS (continued)
All specifications at T A =25°C,V BUS =5V,f s =44.1kHz,f IN =1kHz,16-bit data,unless otherwise noted.
AMPLITUDE
AMPLITUDE
vs
vs
FREQUENCY
FREQUENCY
AMPLITUDE
AMPLITUDE
vs
vs
FREQUENCY
FREQUENCY
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ADC DIGITAL HIGH-PASS FILTER FREQUENCY RESPONSE
Frequency [y f S /1000]
?100
?90?80?70?60?50?40?30
?20?1000.0
0.1
0.2
0.30.4
A m p l i t u d e – d
B
G020
Frequency [y f S /1000]
?1.0
?0.8
?0.6
?0.4
?0.2
0.0
A m p l i t u d e – d B
G021
ADC ANALOG ANTIALIASING FILTER FREQUENCY RESPONSE
f – Frequency – kHz
1
100
1k 10k
10
G022
?1.0?0.8
?0.6
?0.4
?0.2
A m p l i t u d e – d B
G023
PCM2904PCM2906
SLES042C–JUNE 2002–REVISED NOVEMBER 2007
TYPICAL CHARACTERISTICS (continued)
All specifications at T A =25°C,V BUS =5V,f s =44.1kHz,f IN =1kHz,16-bit data,unless otherwise noted.
AMPLITUDE
AMPLITUDE
vs
vs
FREQUENCY
FREQUENCY
Figure 20.Stop-Band Characteristic
Figure 21.Pass-Band Characteristic
AMPLITUDE
AMPLITUDE
vs
vs
FREQUENCY
FREQUENCY
Figure 22.Stop-Band Characteristic
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DAC DIGITAL INTERPOLATION AND DE-EMPHASIS FILTER FREQUENCY RESPONSE
?100
?90?80?70?60?50?40?30
?20?100A m p l i t u d e
– d B
G024
?0.8
?0.6
?0.4
?0.2
0.2
A m p l i t u d e – d B
G025
PCM2904PCM2906
SLES042C–JUNE 2002–REVISED NOVEMBER 2007
TYPICAL CHARACTERISTICS (continued)
All specifications at T A =25°C,V BUS =5V,f s =44.1kHz,f IN =1kHz,16-bit data,unless otherwise noted.
AMPLITUDE
AMPLITUDE
vs
vs
FREQUENCY
FREQUENCY
AMPLITUDE
vs
FREQUENCY
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DAC ANALOG FIR FILTER FREQUENCY RESPONSE
?50
?40?30?20
?10
A m p l i t u d e – d B
G027
?0.8
?0.6
?0.4
?0.2
0.2
0.0
0.10.20.30.40.5
Frequency [y f S ]
A m p l i t u d e – d B
G028
DAC ANALOG LOW-PASS FILTER FREQUENCY RESPONSE
f – Frequency – kHz
1
100
1k 10k
10
G029
?1.0?0.8
?0.6
?0.4
?0.2
f – Frequency – kHz
A m p l i t u d e – d B
0.01
1
10100
0.1G030
PCM2904PCM2906
SLES042C–JUNE 2002–REVISED NOVEMBER 2007
TYPICAL CHARACTERISTICS (continued)
All specifications at T A =25°C,V BUS =5V,f s =44.1kHz,f IN =1kHz,16-bit data,unless otherwise noted.
AMPLITUDE
AMPLITUDE
vs
vs
FREQUENCY
FREQUENCY
Figure 28.Pass-Band Characteristic
AMPLITUDE
AMPLITUDE
vs
vs
FREQUENCY
FREQUENCY
Figure 29.Stop-Band Characteristic
Figure 30.Pass-Band Characteristic
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USB INTERFACE
PCM2904PCM2906
SLES042C–JUNE 2002–REVISED NOVEMBER 2007
Control data and audio data are transferred to the PCM2904/2906via D+(pin 1)and D–(pin 2).All data to/from the PCM2904/2906is transferred at full speed.The device descriptor contains the information described in Table 3.The device descriptor can be modified on request;contact a Texas Instruments representative about the Table 3.Device Descriptor
The configuration descriptor contains the information described in Table 4.The configuration descriptor can be modified on request;contact a Texas Instruments representative about the details.
Table 4.Configuration Descriptor
Interface Four interfaces
Power attribute 0x80(Bus powered,no remote wakeup)Max power
0xFA (500mA.Default value,can be modified)
The string descriptor contains the information described in Table 5.The string descriptor can be modified on request;contact a Texas Instruments representative about Table 5.String Descriptor
#00x0409
#1Burr-Brown from TI (default value,can be modified)#2
USB audio codec (default value,can be modified)
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DEVICE CONFIGURATION
M0024-02
PCM2904PCM2906
SLES042C–JUNE 2002–REVISED NOVEMBER 2007
Figure 31illustrates the USB audio function topology.The PCM2904/2906has four interfaces.Each interface is by alternative settings.
Figure https://www.360docs.net/doc/b511541157.html,B Audio Function Topology
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