參數(shù)資料
型號： LM4935
廠商： National Semiconductor Corporation
元件分類： ADC
英文描述： Audio Sub-System with Dual-Mode Stereo Headphone and Mono High Efficiency Loudspeaker Amplifiers and Multi-Purpose ADC
中文描述： 音頻子系統(tǒng)的雙模單聲道立體聲耳機和揚聲器放大器的高效率和多功能模數(shù)轉(zhuǎn)換器
文件頁數(shù)： 34/112頁
文件大?。?/td> 5017K
代理商： LM4935
12.0 Status & Control Registers
(Continued)
12.13 AGC_2 CONFIGURATION REGISTER
This register is used to control the LM4935’s Automatic Gain Control.
TABLE 14. AGC_2 (0x09h)
Bits
3:0
Field
Description
AGC_MAX_GAIN
This programs the maximum gain that the AGC algorithm can apply to the microphone preamplifier.
AGC_MAX_GAIN
0000
2
0001
2
0010
2
0011
2
0100
2
to 1100
2
1101
2
1110
2
1111
2
Programs the speed at which the AGC will increase gains if it detects the input level is a quiet
signal.
AGC_DECAY
000
2
001
2
010
2
011
2
100
2
101
2
110
2
111
2
If set the AGC algorithm controls the microphone preamplifier more exactly. (Note 17)
AGC_TARGET
Min Level
000
2
6 dB
001
2
8 dB
010
2
10 dB
011
2
12 dB
100
2
14 dB
101
2
16 dB
110
2
18 dB
111
2
20 dB
000
2
6 dB
001
2
8 dB
010
2
10 dB
011
2
12 dB
100
2
14 dB
101
2
16 dB
110
2
18 dB
111
2
20 dB
Max Preamplifier Gain
6 dB
8 dB
10 dB
12 dB
14 dB to 30 dB
32 dB
34 dB
36 dB
6:4
AGC_DECAY
Step Time (ms)
32
64
128
256
512
1024
2048
4096
7
AGC_TIGHT
AGC_TIGHT = 0
Max Level
3 dB
4 dB
5 dB
6 dB
7 dB
8 dB
9 dB
10 dB
3 dB
5 dB
7 dB
9 dB
11 dB
13 dB
15 dB
17 dB
AGC_TIGHT = 1
Note 17:
The AGC can be used to control the analog path of the microphone to the output stages or to optimize the microphone path for recording on the ADC.
When the analog path is used this bit should be set to ensure the target is tightly adhered to. If theADC is the only destination of the microphone or the desired analog
mixer level is line level then AGC_TIGHT should be cleared, allowing greater dynamic rage of the recorded signal. For further details see the
AGC overview
.
L
www.national.com
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相關PDF資料
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相關代理商/技術參數(shù)
參數(shù)描述
LM49350 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Performance Audio Codec Sub-System with a Ground-Referenced Stereo Headphone Amplifier
LM49350RL 制造商:Texas Instruments 功能描述:Audio Codec 1ADC / 1DAC 36-Pin uSMD T/R 制造商:Texas Instruments 功能描述:AUDIO CODEC SUBSYSTEM 36MICRO SMDXT
LM49350RL/NOPB 功能描述:接口—CODEC Hi Perf Audio Codec Subsystem RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型: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 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
LM49350RL/NOPB 制造商:Texas Instruments 功能描述:Audio Codec IC
LM49350RLEVAL 功能描述:音頻 IC 開發(fā)工具 LM49350RL EVAL BOARD RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V
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