參數(shù)資料
型號： LM4935WL
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(jī)和揚(yáng)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
文件大小： 5017K
代理商： LM4935WL
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
34
相關(guān)PDF資料
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM4935WLX 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Audio Sub-System with Dual-Mode Stereo Headphone and Mono High Efficiency Loudspeaker Amplifiers and Multi-Purpose ADC
LM4936 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Stereo 2W Audio Power Amplifiers with Volume Control and Selectable Control Interface (SPI or I2C)
LM49360 制造商:TI 制造商全稱:Texas Instruments 功能描述:Mono Class D Audio Codec PMU with Ground Referenced Headphone Amplifiers, Earpiece Driver, Audio DSP, 2 Step-Down DC-DC Converters, and 7 LDO Regulators
LM49360RL 制造商:TI 制造商全稱:Texas Instruments 功能描述:Mono Class D Audio Codec PMU with Ground Referenced Headphone Amplifiers, Earpiece Driver, Audio DSP, 2 Step-Down DC-DC Converters, and 7 LDO Regulators
LM49360RLX 制造商:TI 制造商全稱:Texas Instruments 功能描述:Mono Class D Audio Codec PMU with Ground Referenced Headphone Amplifiers, Earpiece Driver, Audio DSP, 2 Step-Down DC-DC Converters, and 7 LDO Regulators
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