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PDF CMI9738 Data sheet ( Hoja de datos )
| Número de pieza | CMI9738 | |
| Descripción | 4-Channel Audio Codec | |
| Fabricantes | C-Media Electronics | |
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CMI 9738
Integrated Multi-channel AC‘97
CMI9738 4CH Audio Codec
1. Description and Overview
Preliminary
Specification
Versatility
CMI9738 is a 4CH AC97 CODEC, applicable for
Alongside offering standard LQFP 48pin
packaging option, CMI9738 also offers SOP
currently mainstream MB chipsets of Intel, VIA, 24pin packaging, which helps to further cut the
Ali, and SIS. CMI9738 is ideal for
PC2001-compliant desktops, notebooks, and
home entertainment PCs where high-quality
cost.
More Audio Option
Last but not least,
CMI9738
provides
audio is a must.
4CH Playback
The specially-designed
4CH
hardware
Sensaura® 3D audio option. In that regard,
the audio quality of CMI9738 is fabulous
beyond general expectation.
architecture of CMI9738 allows all types of south
bridge to playback 4CH audio, thus helping Features
commonplace south bridge get rid of the
limitation of 2CH audio playback capability
Intel AC’97 Rev 2.2 compatible
AC-Link Protocol compliance
(patent pending both in Taiwan and United
Full-Duplex Codec
States).
Earphone Buffer
Cost-effectiveness
Line-in/rear out share jack capability
As to the cost concern, CMI9738 integraDteastatShheeet4U.com
4 channels DAC
earphone buffer, analog CD differential interface,
48 LQFP Package and 24-Lead TSSOP
and analog switch for rear channel audio to
Line-in. Simply by using 0.1uf decoupling
Package
capacitor, CMI9738 meets PC2001 frequency
Meet Microsoft’s PC2001 requirements
Sensaura® 3D Enhancement(optional)
response requirements.
DataShee
Pin Block Diagram
37
38
39
40
41
42
NC
AVdd2
REAR_OUT_L
TEST0#
REAR_OUT_R
43 AVss2
44
45
46
47
48
NC
NC
RESERVED
RESERVED
NC
NC
U2
CMI9738-LQFP-48
LINE_IN_R
LINE_IN_L
NC
MIC1
CD_R
CD_GND
CD_L
NC
NC
AUX_IN_R
AUX_IN_L
NC
24
23
22
21
20
19
18
17
16
15
14
13
1
2
3
SDATA_IN
SYNC
4
5
6
7
8
RESET#
AUX_IN_L
AUX_IN_R
CD_L
CD_GND
9
10
11
12
CD_R
MIC1
LINE_IN_L
LINE_IN_R
VREF_OUT
BIT_CLK
SDATA_OUT
XTL_OUT
XTL_IN
DVsdd
Vss
TEST0#
AVdd
LINE_OUT_R
LINE_OUT_L
XADCHR
XADCHL
24
23
22
21
20
19
18
17
16
15
14
13
DataSheet4UC.c-MomEDIA 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:[email protected]
DataSheet4 U .com
Revision Date Apr./2002
Revision 1.1
1 page  
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TABLE OF CONTENTS
1. DESCRIPTION AND OVERVIEW
2. ORDERING INFORMATION
3. PIN/SIGNAL DESCRIPTIONS
3.1 DIGITAL I/O
3.1 ANALOG I/O
3.2 FILTER AND REFERENCE PINS
3.3 POWER AND GROUND SIGNALS
4. DIGITAL INTERFACE
4.1 AC_LINK
4.2 CLOCKING
4.3 RESETTING
4.4 AC-LINK DIGITAL SERIAL INTERFACE PROTOCOL
4.5 AC-LINK AUDIO INPUT FRAME SDATA_IN
4.6 AC-LINK AUDIO OUTPUT FRAME SDATA_OUT
4.7 AC-LINK LOW POWER MODE
5. CMI9738 MIXER
et4U.com
5.1 MIXER INPUT
5.2 MIXER OUTPUT
6. REGISTER INTERFACE
DataSheet4U.com
6.1 REGISTER DESCRIPTIONS
6.2 PIN DESCRIPTIONS
7. AC-LINK TIMING CHARACTERISTICS
7.1 COLD RESET
7.2 WARM RESET
7.3 CLOCKS
7.4 DATA SETUP AND HOLD
7.5 SIGNAL RISE AND FALL TIMES
7.6 AC-LINK LOW POWER MODE TIMING
7.7 ATE TEST MODE
8. ELECTRICAL SPECIFICATIONS
8.1 DC CHARACTERISTICS
8.2 ABSOLUTE MAXIMUM RATINGS
8.3 RECOMMENDED OPERATING CONDITIONS
8.4 MIXER CHARACTERISTICS
8.5 POWER CONSUMPTION
8.6 ANALOG PERFORMANCE CHARACTERISTICS
DataSheet4UC.c-MomEDIA 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:[email protected]
DataSheet4 U .com
CMI 9738
Integrated Multi-channel AC‘97
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Revision Date Apr./2002
Revision 1.1
5 Page 
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CMI 9738
Integrated Multi-channel AC‘97
SYNC remains high for a total duration of 16 BIT_CLKs at the beginning of each audio frame.
Theportion of the audio frame where SYNC is high is defined as the “Tag Phase”. The remainder
of theaudio frame where SYNC is low is defined as the “Data Phase”.
Additionally, for power savings, all clock, sync, and data signals can be halted.
4.5 AC-LINK AUDIO INPUT FRAME SDATA_IN
The audio input frame data streams correspond to the multiplexed bundles of all digital input data
targeting the AC 97 Controller. As is the case for audio output frame, each AC-link audio input
frame consists of 12, 20-bit timeslots. Slot 0 is a special reserved time slot containing 16-bits
which are used for AC-link protocol infrastructure.
et4U.com
Within slot 0 the first bit is a global bit (SDATA_IN slot 0, bit 15) which flags whether CMI9738
is in the “CodecReady” state or not. If the “Codec Ready” bit is a 0, this indicates thatCMI9738 is
not ready for normal operation. This condition is normal following the deassertion of power on
reset for example, while CMI9738’s voltage references settle. When the AC-link “Codec Ready”
indicator bit is a 1 it indicates that the AC-link and CMI9738 control and status registers are in a
fully operational state. The AC ‘97 Controller must further probe the Powerdown Control/Status
Register (section 6.3) to determine exactly which subsections, if any, are ready.
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Prior to any attempts at putting CMI9738 into operation the AC ’97 Controller should poll the
first bit in the audio input frame (SDATA_IN slot 0, bit 15) for an indication that CMI9738 has
gone “Codec Ready”. Once CMI9738 is sampled “Codec Ready”8 then the next 12 bit positions
sampled by the AC ’97 Controller indicate which of the corresponding 12 time slots are assigned
to input data streams, and that they contain valid data. The following diagram illustrates the time
slot-based AC-link protocol.
DataShee
Figure3. AC-link Audio Input Frame
DataSheet4UC.c-MomEDIA 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:[email protected]
DataSheet4 U .com
Revision Date Apr./2002
Revision 1.1
11 Page | ||
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| PDF Descargar | [ Datasheet CMI9738.PDF ] | |
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