CMI9738 - C-Media Electronics, Inc.

CMI 9738

Integrated Multi-channel AC‘97

CMI9738 4CH Preliminary Technical Brief

More Audio Option

Last but not least, CMI9738 provides Sensaura

®

3D audio option. In that regard, the audio qualit

y

of CMI9738 is fabulous beyond general

expectation.

Features

 Intel® AC’97(Rev. 2.2) compatible.

 High S/N ratio meets PC 99 requirements.

 4CH DAC, applicable for leading

motherboard chipsets.

 Full-duplex CODEC.

 Built-in earphone buffer.

 Line-in phonejack share with rear out.

 Low-cost 0.1uf capacitors for decoupling.

 48 LQFP package(pin to pin compatible with

2-channel CODEC) and 24-lead TSSOP

package.

 Drivers support EAX, Echo effects,

WDM version, etc.

 Microsoft® WHQL certified

 Sensaura™HRTF 3D audio enhancement

(

optional

)

.

Universality

CMI9738 is a 4CH AC97 CODEC, applicable fo

r

leading MB chipsets of Intel®, VIA®, Ali®, and

SIS®CMI9738 is ideal for PC99-compliant desktops,

notebooks, and home entertainment PCs where

high-quality audio is a must.

4CH Playback

The specially-designed 4CH hardware architecture o

f

CMI9738 allows all types of south bridge to playbac

k

4CH audio, thus helping commonplace south bridge

get rid of the limitation of 2CH audio playback

capability.

Cost-effectiveness

A

s to the cost concern, CMI9738 integrates the

earphone buffer, analog CD differential interface, and

analog switch for rear channel audio to Line-in.

Simply by using 0.1uf decoupling capacitor, CMI9738

meets PC99 frequency response requirements.

A

longside offering standard LQFP 48pin packaging

option, CMI9738 also offers SOP 24pin packaging,

thus helps further reduce the hardware cost.

Pin Diagram

C-MEDIA Electronics Inc.

6F, 100, Sec. 4, Civil Boulevard, Taipei, Taiwan, R.O.C. 106

TEL: 886-2-8773-1100 FAX: 886-2-8773-2211 E-mail:cmedia@ms4.hinet.net

Revision Date：1/2001

CMI 9738

Integrated Multi-channel AC‘97

PIN DESCRIPTIONS

48-Pin LQFP 24-Pin TSSOP

PIN # Signal Name PIN # Signal Name

1 DVdd1 25 AVdd1

2 XTL_IN 26 AVss1

3 XTL_OUT 27 Vref

4 DVss1 28 Vrefout

5 SDATA_OUT 29 AFILT1

6 BIT_CLK 30 AFILT2

7 DVss2 31 NC

8 SDATA_IN 32 NC

9 DVdd2 33 NC

10 SYNC 34 NC

11 RESET# 35 LINE_OUT_L

12 PC_BEEP 36 LINE_OUT_R

13 PHONE 37 MONO_OUT

14 AUX_IN_L 38 AVdd2

15 AUX_IN_R 39 REAR_OUT_L

16 VIDEO_L 40 TEST0#

17 VIDEO_R 41 REAR_OUT_R

18 CD_L 42 AVss2

19 CD_GND 43 NC

20 CD_R 44 NC

21 MIC1 45 RESERVED

22 MIC2 46 RESERVED

23 LINE_IN_L 47 EAPD

24 LINE_IN_R 48 NC

Revision Date：1/2001

PIN # Signal Name

1 SDATA_IN

2 SYNC

3 RESET#

4 AUX_IN_L

5 AUX_IN_R

6 CD_L

7 CD_GND

8 CD_R

9 MIC1

10 LINE_IN_L

11 LINE_IN_R

12 VREF_OUT

13 AFILT1

14 AFILT2

15 LINE_OUT_L

16 LINE_OUT_R

17 AVdd

18 TEST0#

19 Vss

20 DVsdd

21 XTL_IN

22 XTL_OUT

23 SDATA_OUT

24 BIT_CLK

24

23

22

21

20

19

18

17

16

15

14

13

1

2

3

4

5

6

7

8

9

10

11

12

C-MEDIA Electronics Inc.

6F, 100, Sec. 4, Civil Boulevard, Taipei, Taiwan, R.O.C. 106

TEL: 886-2-8773-1100 FAX: 886-2-8773-2211 E-mail:cmedia@ms4.hinet.net

CMI 9738

Integrated Multi-channel AC‘97

CMI9738 Mixer Block Diagram

LIN

OSC

MUX

PC_BEEP

MIC1

MIC2

BOOST

(+20dB)

VOL

MUTE

PHONE

VOL MUTE

21

22

13

XTL_IN

XTL_OUT

2

3

AC'97

Digital

Interface

SYNC

BIT_CLK

DATA_OUT

SDATA_IN

RESET#

10

6

5

8

11

Σ

DAC

Earphone

Buffer

MUTE

VOL MUTE

MUTE

MASTER

VOLUME

/ MUTE

LINE_OUT_L/R

35, 36

FRONT OUT

REAR OUT

SRC

MUX

PCM IN

Record

Gain

Control

Buf

MUX

MONO_OUT

37

AUX_INL/R

14, 15

Σ

E_IN_L/R

23, 24

M

U

X

Noise

Cancel

CD_GND

CD_L/R

18, 20

19

VOL MUTE

12

ADC

Σ

DAC

MUX

REAR_OUT_L/R

39, 41

Mixer Block Diagram

(LINE_IN/REAR_OUT)

MUTE

Buf

MUTE

XX : LQFP-48

(XX) : SSOP-24

(6, 8)

(7)

(10, 11)

(4, 5)

(9)

(2)

(24)

(23)

(1)

(3)

(21)

(22)

(15, 16)

S

The CMI9738 mixer is designed to the AC’97 specification to manage playback and record

of all digital and analog audio sources in the PC environment. These include：

System audio：digital PCM input and output for business, games, and multimedia

CD/DVD：analog CD/DVD-ROM Redbook audio with internal connections to Codec mixer

Mono microphone：choice of desktop or headset mic, with programmable boost and gain

Speakerphone：use of system mic & speakers for telephony, DSVD, and video conferencing

Stereo line in：analog external line level source from consumer audio, video camera, etc

AUX/synth：analog FM or wavetable synthesizer, or other internal source

SOURCE FUNCTION CONNECTION OUTPUT MIX SUPPORTS:

PC_BEEP PC beep pass thru from PC beeper output •stereo mix of all sources for LINE_OUT

PHONE speakerphone or DLP in from telephony subsystem •mono mic or mix for MONO_OUT

MIC1 desktop microphone from mic jack •stereo output for REAR_OUT

MIC2 headset microphone from headset mic jack

LINE_IN external audio source from line in jack

CD audio from CD-ROM drive cable from CD-ROM INPUT MUX SUPPORTS:

AUX upgrade synth or other external source internal connector •any mono or stereo source

PCM out digital audio output from AC '97 Controller AC-link •mono or stereo mix of all sources

Mix out mix of all sources AC ‘97 internal

LINE_OUT stereo mix of all sources (front channel) to output jack

REAR_OUT stereo output of rear (surround) channel to output jack

MONO_OUT mic or mix for speakerphone or DLP out to telephony subsystem

PCM in digital audio input to AC '97 Controller AC-link

C-MEDIA Electronics Inc.

6F, 100, Sec. 4, Civil Boulevard, Taipei, Taiwan, R.O.C. 106

TEL: 886-2-8773-1100 FAX: 886-2-8773-2211 E-mail:cmedia@ms4.hinet.net

Revision Date：1/2001

CMI 9738

Integrated Multi-channel AC‘97

Circuit Diagram for CMI9738-4CH (48-Pin LQFP)

Revision Date：1/2001

J3

CD IN

1

2

3

4

C20 104

C21 104

R14

47K

R15

47K

C23 104

R13

47K

R

L

GND

C33

101

C34

101

R18

47K

R19

47K

C31 104

C30 104

J5

AUX IN

1

2

3

4

R

L

GND

R24 0

J10

Internal MODEM Connection

1

2

3

4

R25

47K

C52 104

C54

101

R26

47K

C55

101

C53 104

PHONE IN

GND

MONO OUT

+3.3VD

+5VA

R23 0

Y1

24.576MHz

C25

104

C26

OPEN(104)

C28

102

C27

102

C47

104

C48

104

U2

CMI9738-LQFP-48

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

DVdd1

XTL_IN

XTL_OUT

DVss1

SDATA_OUT

BIT_CLK

DVss2

SDATA_IN

DVdd2

SYNC

RESET#

PC_BEEP

PHONE

AUX_IN_L

AUX_IN_R

VIDEO_L

VIDEO_R

CD_L

CD_GND

CD_R

MIC1

MIC2

LINE_IN_L

LINE_IN_R

AVdd1

AVss1

Vref

Vrefout

XADCHL

XADCHR

NC

LINE_OUT_L

LINE_OUT_R

MONO_OUT

AVdd2

REAR_OUT_L

TEST0#

REAR_OUT_R

AVss2

NC

RESERVED

EAPD

NC/SPDIFO

C24

104

C46

20pF

C45

20pF

R20

OPEN(0)

MSTRCLK

ABITCLK

PC_BEEP

XCDL

ASDOUT

ASDIN

ARST#

PHONE_IN

XCDG

LINE_OUT_L

REAR_OUT_L

ASYNC

AUX_INL

LINE_IN_R

AUX_INR

LINE_IN_L

MONO_OUT

MICIN

XCDR

LINE_OUT_R

VIDEO_R

REAR_OUT_R

VIDEO_L

Vrefout

LINE_OUT_L

LINE_OUT_R

ASDOUT

ARST#

MSTRCLK ABITCLK

ASYNC

PC_BEEP

ASDIN

LINE_IN_L

LINE_IN_R

MIN MICIN

CD_COM

CD_INL

CD_INR

AUX_INR

AUX_INL

VIDEO_R

VIDEO_L

PHONE_IN

MONO_OUT

REAR_OUT_R

REAR_OUT_L C51

101

C44

105

C49

105

L12 Fbead

J9

REAR OUT

4

2

1

C50

101

L11 Fbead

J1

LINE IN/REAR OUT

4

2

1

C1 105

C2 105

C6

101

L1

Fbead

L2

Fbead

C7

101

R3

47K

R4

47K

+5VA

C18

102

C19

472

C11

105

R7

10K

R9 3K3

J2

MIC IN

4

2

1

L9 Fbead

L10 Fbead

+

C36

220uF/16V

+

C39

220uF/16V

J7

FRONT OUT

4

2

1

C40

101

C41

101

C43

101

C42

101

R21

47K

C37 104

C38 104

R22

47K

J8

VIDEO IN

1

2

3

4

R

L

GND

+5VA

+3.3VD

+12VD

P1

AMR BUS

A1

A2

A3

A4

A5

A6

A7

A8

A9

A10

A11

A12

A13

A14

A15

A16

A17

A18

A19

A20

A21

A22

A23

B1

B2

B3

B4

B5

B6

B7

B8

B9

B10

B11

B12

B13

B14

B15

B16

B17

B18

B19

B20

B21

B22

B23

AUDIO_PWRDN

MONO_PHONE

RSCD

GND

+5Vdual/+5VSB

USB_OC#

GND

USB+

USB-

GND

S/PDIF_IN

GND

+3.3Vdual/+3.3VSB

GND

AC97_SYNC

GND

AC97_SDATA_IN1

GND

AC97_SDATA_IN0

GND

AC97_BITCLK

AUDIO_MUTE#

GND

MONO_OUT/PC_BEEP

RSVD

PRIMARY_DN#

-12V

GND

+12V

GND

+5VD

GND

RSVD

+3.3VD

GND

AC97_SDATA_OUT

AC97_RESET#

AC97_SDATA_IN3

GND

AC97_SDATA_IN2

GND

AC97_MSTRCLK

+

C13

10uF/16V

C14

104

R8 OPEN(47)

R10 47

+

C9

10uF/16V

L3 FbeadR2 47K

R1

4K7

R5

4K7

C3

104

C-MEDIA Electronics Inc.

6F, 100, Sec. 4, Civil Boulevard, Taipei, Taiwan, R.O.C. 106

TEL: 886-2-8773-1100 FAX: 886-2-8773-2211 E-mail:cmedia@ms4.hinet.net

CMI 9738

Integrated Multi-channel AC‘97

Circuit Diagram for CMI9738-4CH (24-Pin SOP)

+12VD +5VA

+

C4

10uF/16V

C5

104

U1

78L05

1

2

3

VIN

GND

VOUT

+

C8

10uF/16V

J1

LINE IN/REAR OUT

4

2

1

C1 105

C2 105

C6

101

L1

Fbead

L2

Fbead

C7

101

R3

47K

R4

47K

+5VA

C18

102

C19

472

C11

105

R7

10K

R9 3K3

J2

MIC IN

4

2

1

+3.3VD +5VA

R23 0

Y1

24.576MHz

C26

OPEN(104)

C28

102

C27

102

C47

104

C48

104

U2

CMI9738-SOP-24

1

2

3

4

5

6

7

8

9

10

11

12 13

14

15

16

17

18

19

20

21

22

23

24

SDATA_IN

SYNC

RESET#

AUX_IN_L

AUX_IN_R

CD_L

CD_GND

CD_R

MIC1

LINE_IN_L

LINE_IN_R

VREF_OUT XADCHL

XADCHR

LINE_OUT_L

LINE_OUT_R

AVdd

TEST0#

Vss

DVsdd

XTL_IN

XTL_OUT

SDATA_OUT

BIT_CLK

C24

104

C46

20pF

C45

20pF

R20

OPEN(0)

MSTRCLKAUX_INL

XCDR

XCDL

MICIN

ARST#

AUX_INR

XCDG

LINE_OUT_LLINE_IN_L

ASYNC

LINE_OUT_R

ASDOUT

ASDIN

LINE_IN_R

ABITCLK

ASDOUT

ARST#

MSTRCLK ABITCLK

ASYNC

ASDIN

LINE_IN_L

LINE_IN_R

MIN MICIN

CD_COM

CD_INL

CD_INR

AUX_INR

AUX_INL

LINE_OUT_L

LINE_OUT_R

+3.3VD

+12VD

P1

AMR BUS

A1

A2

A3

A4

A5

A6

A7

A8

A9

A10

A11

A12

A13

A14

A15

A16

A17

A18

A19

A20

A21

A22

A23

B1

B2

B3

B4

B5

B6

B7

B8

B9

B10

B11

B12

B13

B14

B15

B16

B17

B18

B19

B20

B21

B22

B23

AUDIO_PWRDN

MONO_PHONE

RSCD

GND

+5Vdual/+5VSB

USB_OC#

GND

USB+

USB-

GND

S/PDIF_IN

GND

+3.3Vdual/+3.3VSB

GND

AC97_SYNC

GND

AC97_SDATA_IN1

GND

AC97_SDATA_IN0

GND

AC97_BITCLK

AUDIO_MUTE#

GND

MONO_OUT/PC_BEEP

RSVD

PRIMARY_DN#

-12V

GND

+12V

GND

+5VD

GND

RSVD

+3.3VD

GND

AC97_SDATA_OUT

AC97_RESET#

AC97_SDATA_IN3

GND

AC97_SDATA_IN2

GND

AC97_MSTRCLK

+

C13

10uF/16V

C14

104

R8 OPEN(47)

R10 47

C33

101

C34

101

R18

47K

R19

47K

C31 104

C30 104

J5

AUX IN

1

2

3

4

R

L

GND

L9 Fbead

L10 Fbead

+

C36

220uF/16V

+

C39

220uF/16V

J7

FRONT OUT

4

2

1

C40

101

C41

101

J3

CD IN

1

2

3

4

C20 104

C21 104

R14

47K

R15

47K

C23 104

R13

47K

R

L

GND

C-MEDIA Electronics Inc.

6F, 100, Sec. 4, Civil Boulevard, Taipei, Taiwan, R.O.C. 106

TEL: 886-2-8773-1100 FAX: 886-2-8773-2211 E-mail:cmedia@ms4.hinet.net

Revision Date：1/2001

CMI 9738

Integrated Multi-channel AC‘97

ORDERING INFORMATION

Part Number Package Temperature Range Supply Range

CMI9738 48-Pin LQFP 9mm×7mm×1.6mm 0 o C to +70 o C DVdd = 3.3V or 5V, AVdd = 5V

CMI9738 24 Pin-TSSOP 7.9mm×6.5mm×1.1mm 0 o C to +70 o C DVdd = 3.3V or 5V, AVdd = 5V

Outline Dimensions Dimensions shown in inches and （mm）

48-Lead Thin Plastic Quad Flatpack (LQFP) (ST-48)

24-Lead Plastic TSSOP (RU-24)

C-Media reserves the right to change specifications without notice.

C-MEDIA Electronics Inc.

6F, 100, Sec. 4, Civil Boulevard, Taipei, Taiwan, R.O.C. 106

TEL: 886-2-8773-1100 FAX: 886-2-8773-2211 E-mail:cmedia@ms4.hinet.net

Revision Date：1/2001