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

https://www.360docs.net/doc/b511541157.html,

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

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

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

(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–

BUS DGNDU

HID0

HID1

HID2

SEL0

SEL1

CCCI AGNDC

V L

V R

COM

SSPND

TEST0

CCXI

AGNDX

XTO

CCP2I

DGND

CCP1I

V L

OUT

XTI

TEST1

DDI

AGNDP

V R

OUT

PCM2904

(Top View)

D+

D–

BUS

DGNDU

HID0

HID1

HID2

SEL0

SEL1

CCCI

AGNDC

V L

V R

COM

SSPND

DIN

CCXI

AGNDX

XTO

CCP2I

DGND

CCP1I

V L

OUT

XTI

DOUT

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

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

?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

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

FREE-AIR TEMPERATURE

Figure 1.THD+N at –0.5dB vs Temperature Figure 2.

TOTAL HARMONIC DISTORTION +NOISE

DYNAMIC RANGE and SNR

SUPPLY VOLTAGE

Figure 3.THD+N at –0.5dB vs Supply Voltage Figure 4.

https://www.360docs.net/doc/b511541157.html,

0.003

0.0040.0050.0060.0070.0080.0090.010

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

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

SAMPLING FREQUENCY

Figure 5.THD+N at –0.5dB vs Sampling Frequency

Figure 6.

TOTAL HARMONIC DISTORTION +NOISE

DYNAMIC RANGE and SNR

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

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

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

SUPPLY VOLTAGE

Figure 9.THD+N at 0dB vs Supply Voltage Figure 10.

TOTAL HARMONIC DISTORTION +NOISE

DYNAMIC RANGE and SNR

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

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

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

SUPPLY VOLTAGE

Figure 13.

OPERATIONAL SUPPLY CURRENT

SUSPEND SUPPLY CURRENT

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

FREQUENCY

AMPLITUDE

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

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

100

1k 10k

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

FREQUENCY

Figure 20.Stop-Band Characteristic

Figure 21.Pass-Band Characteristic

AMPLITUDE

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

FREQUENCY

AMPLITUDE

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

100

1k 10k

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

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

FREQUENCY

Figure 28.Pass-Band Characteristic

AMPLITUDE

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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