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參數(shù)資料
| 型號(hào)： | WM9712LEFT |
| 廠商： | Wolfson Microelectronics |
| 元件分類(lèi)： | Codec |
| 英文描述： | AC97 Audio and Touchpanel CODEC |
| 中文描述： | AC97音頻編解碼器和觸摸屏 |
| 文件頁(yè)數(shù)： | 21/78頁(yè) |
| 文件大小： | 689K |
| 代理商： | WM9712LEFT |
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Production Data
WM9712L
w
PD Rev 4.0 December 2003
21
RECORD GAIN
The amplitude of the signal that enters the audio ADC is controlled by the Record PGA
(Programmable Gain Amplifier). The PGA gain can be programmed either by writing to the Record
Gain register, or by the Automatic Level Control (ALC) circuit (see next section). When the ALC is
enabled, any writes to the Record Gain register have no effect.
Two different gain ranges can be implemented: the standard gain range defined in the AC’97
standard, or an extended gain range with smaller gain steps. The ALC circuit always uses the
extended gain range, as this has been found to result in better sound quality.
The output of the Record PGA can also be mixed into the phone and/or headphone outputs (see
“Audio Mixers”). This makes it possible to use the ALC function for the microphone signal in a
smartphone application.
REGISTER
ADDRESS
1Ch
Record Gain
BIT
LABEL
DEFAULT
DESCRIPTION
15
RMU
1
Mute Audio ADC (both channels)
1: Mute (OFF)
0: No Mute (ON)
Gain range select (left)
0: Standard (0 to 22.5dB, 1.5dB step size)
1: Extended (-17.25 to +30dB, 0.75dB steps)
Record Volume (left)
Standard (GRL=0)
XX0000: 0dB
XX0001: +1.5dB
… (1.5dB steps)
XX1111: +22.5dB
Zero Cross Enable
0: Record Gain changes immediately
1: Record Gain changes when signal is zero
or after time-out
Gain range select (right)
Similar to GRL
Record Volume (right)
Similar to RECVOLL
14
GRL
0
Extended (GRL=1)
000000: -17.25dB
000001: -16.5dB
… (0.75dB steps)
111111: +30dB
13:8
RECVOLL
000000
7
ZC
0
6
GRR
0
5:0
RECVOLR
000000
Table 8 Record Gain Register
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| WM9712LEFV | AC97 Audio and Touchpanel CODEC |
| WM9712LSEFL | AC97 Audio and Touchpanel CODEC |
| WM9712LSEFT | AC97 Audio and Touchpanel CODEC |
| WM9712LSEFV | AC97 Audio and Touchpanel CODEC |
| WME128K8-XXX | 128Kx8 CMOS MONOLITHIC EEPROM, SMD 5962-96796 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| WM9712LEFT/RV | 制造商:WOLFSON 制造商全稱(chēng):WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC |
| WM9712LEFV | 制造商:WOLFSON 制造商全稱(chēng):WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC |
| WM9712LGEFL/RV | 功能描述:接口—CODEC STR AC’97 CODEC TP 48-pin TQFP RoHS:否 制造商:Texas Instruments 類(lèi)型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類(lèi)型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| WM9712LGEFL/V | 功能描述:接口—CODEC Stereo AC’97 CODEC T/P Interface RoHS:否 制造商:Texas Instruments 類(lèi)型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類(lèi)型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| WM9712LSEFL | 制造商:WOLFSON 制造商全稱(chēng):WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC |
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