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PDF CMI9739A Data sheet ( Hoja de datos )
| Número de pieza | CMI9739A | |
| Descripción | 6-Channel Audio Codec | |
| Fabricantes | C-Media Electronics | |
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CMI9739/CMI9739A Six Channel Audio Codec
Specifications
Description and Overview
CMI 9739
Integrated Multi-channel AC’97
Preliminary
Universality
CMI9739 is a 6CH AC97 CODEC, applicable
for major MB chipsets of Intel, VIA, Ali, and
SIS. CMI9739 is ideal for PC2001-compliant
desktops, notebooks, and home entertainment
PCs where high-quality audio is a must.
Features
Intel AC’97(Rev 2.2) compatible, meeting
Microsoft’s PC2001 requirements
Built-in earphone buffer and internal PLL,
the latter saving additional crystal.
Earphone buffer, optional on HP_OUT
6CH Playback
The specially-designed 6CH hardware
architecture of CMI9739 allows multi-channel
south bridge to playback 6CH audio.
Cost-effectiveness
As to the cost concern, CMI9739 integrates the
pins(9739) or LINE_HP_OUT pins(9739A).
Line-in/rear out share the same jack.
Center/bass share the MIC jack.
Digital S/PDIF IN/OUT support
48 LQFP package.
CRL 3D: HRTF based DS3D compatible
audio engine.
earphone buffer, analog CD differential EAX 1.0 & 2.0 compatible.
interface, and analog switch for rear channel Sensaura 3D audio enhancement
audio to Line-in. Besides, Mic-in can share
(optional).
same jack with center/bass outputDatfaoSrheet4U.1cI/o8Om-(2IC0bHit4D).AC interface for SPDIF
traditional 3 jacks audio port to output 6
channels audio. CMI9739 also has built-in PLL
to save additional crystal.
DataShee
More Audio Option
Last but not least, CMI9739 provides HRTF 3D
audio which interface compatible with EAX/
A3D/DirectSound3D. In addition, it provides
Sensaura 3D audio option. In that regard,
the audio quality of CMI9739 is fabulous
beyond general expectation.
DataSheet4URV.ceeorvsmiisoionn:
Date:
May
1.3
2002
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CMI 9739
Integrated Multi-channel AC’97
2. ORDERING INFORMATION
Model Number
CMI9739
CMI9739A
Package
48-Pin LQFP
9mm×7mm×1.6mm
48-Pin LQFP
9mm×7mm×1.6mm
Temperature Range
0 o C to +70 o C
0 o C to +70 o C
Outline of Dimensions Dimensions shown in inches and (mm）
48-Lead Thin Plastic Quad Flatpack (LQFP) (ST-48)
Supply Range
DVdd = 3.3V, AVdd = 5V
DVdd = 3.3V, AVdd = 5V
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*C-Media reserves the right to modify the specifications without further notice.
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CMI 9739
Integrated Multi-channel AC’97
4.4 AC-LINK DIGITAL SERIAL INTERFACE PROTOCOL
CMI9739 transits data to the AC'97 controller via a 5-pin digital serial AC-Link interface , which is
a bi-directional, fixed rate, serial PCM digital stream. All digital audio streams, commands, and
status information are transitted over this point-to-point serial transmission. The AC-Link
processes multiple inputs, output audio streams, as well as control register accesses by a time
division complex (TDM) scheme. The AC'97 controller synchronizes all AC-Link data
transmissions.The following data streams are available on CMI9739：
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· SDATA_OUT TAG
· SDATA_IN TAG
· Status (STATUS ADDR & DATA) read port
· PCM L & R DAC Playback
· PCM L & R ADC Record
· PCM Center/LFE DAC Playback
· PCM L-SURR/R-SURR DAC Playback
· LINE2 DAC/HSET DAC Support 96K Audio Frame
1 output slot (0)
1 input slot (0)
2 input slots (1,2)
2 output slots (3,4)
2 input slots (3,4)
2 output slots (6,9)
2 output slots (7,8)
2 output slots (10,11)
Figure2. AC ‘97 Standard Bi-directional Audio Frame
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Synchronization of all AC-Link data transmissions is processed by the AC'97 controller.
CMI9739 drives the serial bit clock onto AC-Link. The AC'97 controller then utilizes a
synchronization signal to construct audio frames.
Fixed at 48 kHz, SYNC is derived by dividing the serial bit clock (BIT_CLK). BIT_CLK, fixed at
12.288 MHz, and can provide necessary clocking granularity to support 12, 20-bit outgoing and
incoming time slots. AC-Link serial data is transmitted on each rising edge of BIT_CLK. As the
receiver of AC-Link data, CMI9739 for the outgoing data whereas AC'97 controller the incoming,
sampling each serial bit on the falling edges of BIT_CLK.
The AC-Link protocol provides a special 16-bit (13-bit is defined with 3 reserved trailing bit
positions) time slot (Slot 0) wherein each bit conveys a valid tag for its corresponding time slot
within the current audio frame. A “1” in a given bit position of slot 0 indicates that the
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2002
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