CMI 9738
Integrated Multi-channel AC`97
CMI9738 4CH Audio Codec Preliminary Specification
1. Description and Overview
Versatility
CMI9738 is a 4CH AC97 CODEC, applicable for
currently mainstream MB chipsets of Intel, VIA,
Ali, and SIS. CMI9738 is ideal for
PC2001-compliant desktops, notebooks, and
home entertainment PCs where high-quality
audio is a must.
4CH Playback
The specially-designed 4CH hardware
architecture of CMI9738 allows all types of south
bridge to playback 4CH audio, thus helping
commonplace south bridge get rid of the
limitation of 2CH audio playback capability
(patent pending both in Taiwan and United
States).
Cost-effectiveness
As 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 PC2001 frequency
response requirements.
Features
Intel AC'97 Rev 2.2 compatible
AC-Link Protocol compliance
Full-Duplex Codec
Earphone Buffer
Line-in/rear out share jack capability
4 channels DAC
48 LQFP Package and 24-Lead TSSOP
Package
Meet Microsoft's
PC2001 requirements
Sensaura 3D Enhancement(optional)
Alongside offering standard LQFP 48pin
packaging option, CMI9738 also offers SOP
24pin packaging, which helps to further cut the
cost.
More Audio Option
Last but not least, CMI9738 provides
Sensaura 3D audio option. In that regard,
the audio quality of CMI9738 is fabulous
beyond general expectation.
Pin Block Diagram
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# NC
NC
AUX_IN_L
AUX_IN_R
NC
NC
CD_L
CD_GND
CD_R
MIC1
NC
LINE_IN_L
LINE_IN_R
AVdd1
AVss1
NC
Vrefout
AFILT1
AFILT2
NC
NC
NC
NC
LINE_OUT_L
LINE_OUT_R
NC
AVdd2
REAR_OUT_L
TEST0#
REAR_OUT_R
AVss2
NC
NC
RESERVED
RESERVED
NC
NC
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
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:sales@cmedia.com.tw
Revision DateApr./2002
Revision 1.1
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 NC
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 NC
36 LINE_OUT_R
13 NC
37 NC
14 AUX_IN_L
38 AVdd2
15 AUX_IN_R
39 REAR_OUT_L
16 NC
40 TEST0#
17 NC
41 REAR_OUT_R
18 CD_L
42 AVss2
19 CD_GND
43 NC
20 CD_R
44 NC
21 MIC1
45 RESERVED
22 NC
46 RESERVED
23 LINE_IN_L
47 NC
24 LINE_IN_R
48 NC
C-MEDIA Electronics Inc.
6F, 100, Sec. 4, Civil Boulevard, Taipei, Taiwan, R.O.C.
TEL: 886-2-8773-1100 FAX: 886-2-8773-2211 E-mail:sales@cmedia.com.tw
106
Revision DateApr./2002
Revision 1.1
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
CMI 9738
Integrated Multi-channel AC`97
CMI9738 Mixer Block Diagram
LINE_IN_L/
OSC
MIC1
BOOST
(+20dB)
VOL
MUTE
21
XTL_IN
XTL_OUT
2
3
AC'97
Digital
Interface
SYNC
BIT_CLK
DATA_OUT
SDATA_IN
RESET#
10
6
5
8
11
DAC
Earphone
Buffer
VOL
MUTE
MUTE
MASTER
VOLUME
/ MUTE
LINE_OUT_L/R
35, 36
FRONT OUT
REAR OUT
SRC
M
U
X
PCM IN
Record
Gain
Control
AUX_INL/R
14, 15
R
23, 24
M
U
X
Noise
Cancel
CD_GND
CD_L/R
18, 20
19
ADC
DAC
M
U
X
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)
SRC
REAR OUT
MUTE
VOL
MUTE
VOL
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
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:sales@cmedia.com.tw
Revision DateApr./2002
Revision 1.1
SOURCE
FUNCTION
CONNECTION
OUTPUT MIX SUPPORTS:
MIC1
desktop microphone
from mic jack
stereo mix of all sources for LINE_OUT
LINE_IN
external audio source
from line in jack
stereo output for REAR_OUT
CD
audio from CD-ROM drive
cable from CD-ROM
AUX
upgrade synth or other external source
internal connector
PCM out
digital audio output from AC '97 Controller
AC-link
INPUT MUX SUPPORTS:
Mix out
mix of all sources
AC `97 internal
any mono or stereo source
LINE_OUT
stereo mix of all sources (front channel)
to output jack
mono or stereo mix of all sources
REAR_OUT
stereo output of rear (surround) channel
to output jack
PCM in
digital audio input to AC '97 Controller
AC-link
CMI 9738
Integrated Multi-channel AC`97
2. ORDERING INFORMATION
Part Number
Package
Temperature Range
Supply Range
CMI9738
48-Pin LQFP 9mm7mm1.6mm
0 o C to +70 o C
DVdd = 3.3V, AVdd = 5V
CMI9738
24 Pin-TSSOP 7.9mm6.5mm1.1mm
0 o C to +70 o C
DVdd = 3.3V, 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 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:sales@cmedia.com.tw
Revision DateApr./2002
Revision 1.1
C-Media reserves the right to change specifications without notice.
CMI 9738
Integrated Multi-channel AC`97
TABLE OF CONTENTS
1.
DESCRIPTION
AND
OVERVIEW
1
2.
ORDERING
INFORMATION
4
3.
PIN/SIGNAL
DESCRIPTIONS
8
3.1
DIGITAL
I/O
8
3.1
ANALOG
I/O
8
3.2
FILTER
AND
REFERENCE
PINS
8
3.3
POWER
AND
GROUND
SIGNALS
9
4. DIGITAL INTERFACE
10
4.1
AC_LINK
10
4.2
CLOCKING
10
4.3
RESETTING
10
4.4
AC-LINK DIGITAL SERIAL INTERFACE PROTOCOL
11
4.5
AC-LINK AUDIO INPUT FRAMESDATA_IN
12
4.6
AC-LINK AUDIO OUTPUT FRAMESDATA_OUT
14
4.7
AC-LINK
LOW
POWER
MODE
17
5.
CMI9738
MIXER 19
5.1
MIXER
INPUT
20
5.2
MIXER
OUTPUT
20
6. REGISTER INTERFACE
21
6.1
REGISTER
DESCRIPTIONS
22
6.2
PIN
DESCRIPTIONS
28
7.
AC-LINK
TIMING
CHARACTERISTICS
29
7.1
COLD
RESET
29
7.2
WARM
RESET
29
7.3
CLOCKS
29
7.4
DATA
SETUP
AND
HOLD
30
7.5
SIGNAL
RISE
AND
FALL
TIMES
31
7.6
AC-LINK
LOW
POWER
MODE
TIMING
32
7.7
ATE
TEST
MODE
32
8.
ELECTRICAL
SPECIFICATIONS
33
8.1
DC
CHARACTERISTICS
33
8.2
ABSOLUTE
MAXIMUM
RATINGS
33
8.3
RECOMMENDED
OPERATING
CONDITIONS
34
8.4
MIXER
CHARACTERISTICS
34
8.5
POWER
CONSUMPTION
35
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:sales@cmedia.com.tw
Revision DateApr./2002
Revision 1.1
8.6
ANALOG
PERFORMANCE
CHARACTERISTICS
35
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