- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄382553 > ST7597 (意法半導體) AC97 Audio Codec(AC97 音頻編解碼器) PDF資料下載
參數(shù)資料
| 型號： | ST7597 |
| 廠商： | 意法半導體 |
| 元件分類： | Codec |
| 英文描述： | AC97 Audio Codec(AC97 音頻編解碼器) |
| 中文描述： | AC97音頻編解碼器（AC97音頻編解碼器） |
| 文件頁數(shù)： | 11/20頁 |
| 文件大?。?/td> | 208K |
| 代理商： | ST7597 |
2.2.1 - Waking up the AC-link
There are 2 methods for bringing the AC-link out of
a low power, halted mode,. Regardless of the
method, it is the ST7597 controller that performs
the wake up task.
AC-link protocol provides for a "Cold ST7597 Re-
set", and a "Warm ST7597 Reset". The current
power down state would ultimately dictate which
form of ST7597 reset is appropriate. Unless a
"cold" or "register" reset (a write to the Reset reg-
ister) is performed, wherein the ST7597 registers
are initialized to their default values, registers will
keep state during all power down modes.
Once power down, re-activation of the AC-link via
re-assertion of the SYNC signal must not occur for
a minimum of 4 audio frame times following the
frame which the power down was triggered. When
AC-link powers up it indicates readiness via the
Codec Ready bit (input slot 0, bit 15).
2.2.1.1 - Cold ST7597 Reset
A cold ST7597 reset is achieved by asserting RE-
SET for the minimum specified time. By driving
RESET low, BIT_CLK, and SDATA_OUT will be
activeted, or re-activated as the case may be, and
all ST7597 control registers will be initialized to their
default power on reset values.
RESET ia an asynchronous ST7597 input
(see Figure 8).
2.2.1.2 - Warm ST7597 Reset
A warm ST7597 reset will re-activated the AC-link
without altering the current ST7597 register values.
A warm reset is signaled by driving SYNC high for
a minimum of 1uS in the absence of BIT_CLK.
Within normal audio frames SYNC is a synchro-
nous ST7597 input. However, in the absence of
BIT_CLK, SYNC is treated as an asynchronous
input used in the generation of a warm reset to
ST7597. ST7597 will not respond with the activa-
tion of the BIT_CLK until SYNC has sampled low
again by ST7597. This will preclude the false de-
tection of a new audio frame (see Figure 9).
2.3 - ATE Test Mode
ST7597 has a ATE in circuit test mode. ST7597
enters the ATE in circuit test mode if SDATA_OUT
is sampled high at the trailing edge of RESET.
It is necessary to apply a "cold reset" to resume
normal operating mode (see Figure 10).
3 - ST7597 MIXER
(see Block Diagram)
The ST7597 mixer is designed to manage playback
and record of all digital and analog audio sources,
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.
- Video : TV tuner or video capture card with inter-
nal connections to codec mixer
- AUX/synth : analog FM or wavetable synthesizer,
or other internal sources
3.1 - Mixer Output
The ST7597 mixer generates two distinct outouts :
- a stereo mix of all sources to LINE_OUT.
- a mono, mic only or mix of all sources (minus
PHONE and PC_BEEP) for MONO_OUT.
3.2 - Mixer Input
The mixer input is a MUX design which offers the
capability to record any of the audio sources or the
outgoing mix of all sources. This design is more
efficient to implement than an independant input
mix, allows the user to apply 3D and tone controls
to recording, and offers simple monitoring when a
mix is recorded: what you hear is what you get
(WYHIWYG). Mono and stereo mix also provide
excellent echo cancelation reference signals.
ST7597 supports the full range of input options, tha
audio driver should maintain a persistent record
input level for each MUX inputs :
- any mono or stereo source
- mono or stereo mix of all sources
- 2-channel input with mono output reference (mic
+ mono mix for mono echo cancellation)
FUNCTIONAL DESCRIPTION
(continued)
ST7597
11/20
相關PDF資料 |
PDF描述 |
|---|---|
| ST75C185 | LOW POWER MULTIPLE RS-232 DRIVERS AND RECEIVERS |
| ST75C185BD | LOW POWER MULTIPLE RS-232 DRIVERS AND RECEIVERS |
| ST75C185BDR | MOSFET, P, SOIC; Current, Id cont:9.8A; Case style:SOIC; Base number:4463; Charge, gate p channel:37nC; Pins, No. of:8; Resistance, Rds on @ Vgs = 10V:0.011R; Resistance, Rds on @ Vgs = 2.5V:0.02R; Resistance, Rds on @ Vgs = RoHS Compliant: Yes |
| ST75C185BN | LOW POWER MULTIPLE RS-232 DRIVERS AND RECEIVERS |
| ST75C185BTR | LOW POWER MULTIPLE RS-232 DRIVERS AND RECEIVERS |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ST75C176 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW POWER RS-485/RS-422 TRANSCEIVER |
| ST75C176_06 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW POWER RS-485/RS-422 TRANSCEIVER |
| ST75C176B | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW POWER RS784/RS422 TRANSCEIVER |
| ST75C176BD | 功能描述:緩沖器和線路驅(qū)動器 Low Power Transcvr RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| ST75C176BDR | 功能描述:緩沖器和線路驅(qū)動器 Low Power Transcvr RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復。