參數(shù)資料
型號: WLA49VVA
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): 40/112頁
文件大小: 5017K
代理商: WLA49VVA
12.0 Status & Control Registers (Continued)
12.12 AGC_1 CONFIGURATION REGISTER
This register is used to control the LM4935’s Automatic Gain Control. (Note 16)
TABLE 13. AGC_1 (0x08h)
Bits
Field
Description
0
AGC_ENABLE
If set the AGC controls the analog microphone preamplifier gain into the system. The microphone
input must be passed to the ADC.
3:1
AGC_TARGET
Programs the target level of the AGC. This will depend on the expected transients and desired
headroom. Refer to AGC_TIGHT (bit 7 of 0x09h) for more detail.
AGC_TARGET
Target 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
4
NOISE_GATE_ON
If set, signals below the noise gate threshold are muted.The noise gate is only activated after a set
period of signal absence.
7:5
NOISE_
GATE_
THRES
This field sets the expected background noise level relative to the peak signal level. The sole
presence of signals below this level will not result in an AGC gain change of the input and will be
gated from the ADC output if the NOISE_GATE_ON is set. This level must be set even if the noise
gate is not in use as it is required by the AGC algorithm.
NOISE_GATE_THRES
Level
000
2
72 dB
001
2
66 dB
010
2
60 dB
011
2
54 dB
100
2
48 dB
101
2
42 dB
110
2
36 dB
111
2
30 dB
Note 16: See the AGC overview.
LM4935
www.national.com
33
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