参数资料
型号: WLA49VVA
厂商: National Semiconductor Corporation
元件分类: 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: 音频子系统的双模单声道立体声耳机和扬声器放大器的高效率和多功能模数转换器
文件页数: 41/112页
文件大小: 5017K
代理商: WLA49VVA
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
Field
Description
3:0
AGC_MAX_GAIN
This programs the maximum gain that the AGC algorithm can apply to the microphone preamplifier.
AGC_MAX_GAIN
Max Preamplifier Gain
0000
2
6dB
0001
2
8dB
0010
2
10 dB
0011
2
12 dB
0100
2 to 11002
14 dB to 30 dB
1101
2
32 dB
1110
2
34 dB
1111
2
36 dB
6:4
AGC_DECAY
Programs the speed at which the AGC will increase gains if it detects the input level is a quiet
signal.
AGC_DECAY
Step Time (ms)
000
2
32
001
2
64
010
2
128
011
2
256
100
2
512
101
2
1024
110
2
2048
111
2
4096
7
AGC_TIGHT
If set the AGC algorithm controls the microphone preamplifier more exactly. (Note 17)
AGC_TIGHT = 0
AGC_TARGET
Min Level
Max Level
000
2
6 dB
3 dB
001
2
8 dB
4 dB
010
2
10 dB
5 dB
011
2
12 dB
6 dB
100
2
14 dB
7 dB
101
2
16 dB
8 dB
110
2
18 dB
9 dB
111
2
20 dB
10 dB
AGC_TIGHT = 1
000
2
6 dB
3 dB
001
2
8 dB
5 dB
010
2
10 dB
7 dB
011
2
12 dB
9 dB
100
2
14 dB
11 dB
101
2
16 dB
13 dB
110
2
18 dB
15 dB
111
2
20 dB
17 dB
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 the ADC 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.
LM4935
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