參數(shù)資料
型號(hào)： LM4935WLX
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(yè)數(shù)： 33/112頁(yè)
文件大?。?/td> 5017K
代理商： LM4935WLX
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
0
Field
Description
AGC_ENABLE
If set the AGC controls the analog microphone preamplifier gain into the system. The microphone
input must be passed to the ADC.
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
000
2
001
2
010
2
011
2
100
2
101
2
110
2
111
2
If set, signals below the noise gate threshold are muted.The noise gate is only activated after a set
period of signal absence.
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
000
2
001
2
010
2
011
2
100
2
101
2
110
2
111
2
3:1
AGC_TARGET
Target Level
6 dB
8 dB
10 dB
12 dB
14 dB
16 dB
18 dB
20 dB
4
NOISE_GATE_ON
7:5
NOISE_
GATE_
THRES
Level
72 dB
66 dB
60 dB
54 dB
48 dB
42 dB
36 dB
30 dB
Note 16:
See the
AGC overview
.
L
www.national.com
33
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參數(shù)描述
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
LM4936MH 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
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