參數(shù)資料
型號(hào)： 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)： 37/112頁
文件大小： 5017K
代理商： LM4935WL
12.0 Status & Control Registers
(Continued)
12.16 MIC_1 CONFIGURATION REGISTER
This register is used to control the microphone configuration.
TABLE 16. MIC_1 (0x0Bh)
Bits
3:0
Field
Description
PREAMP_GAIN
Programs the gain applied to the microphone preamplifier if the AGC is not in use.
PREAMP_GAIN
0000
2
0001
2
0010
2
0011
2
0100
2
to 1100
2
1101
2
1110
2
1111
2
If set the microphone preamplifier is muted.
If set the internal microphone is assumed to be single ended and the negative connection is
connected to the ADC common mode point internally. This allows a single-ended internal
microphone to be used.
If set the single ended external microphone is used and the negative microphone input is grounded
internally, otherwise internal microphone operation is assumed. (Note 19)
Gain
6 dB
8 dB
10 dB
12 dB
14 dB to 30 dB
32 dB
34 dB
36 dB
4
5
MIC_MUTE
INT_SE_DIFF
6
INT_EXT
Note 19:
On changing INT_EXT from internal to external note that the dc blocking cap will not be charged so some time should be taken (300 ms for a 1 μF cap)
between the detection of an external headset and the switching of the output stages andADC to that input to allow the DC points on either side of this cap to stabilize.
This can be accomplished by deselecting the microphone input from the audio outputs and ADC until the DC points stabilize.
An active MIC path to CPOUT or the ADC may result in the microphone DC blocking caps causing audio pops under the following situations:
1) Switching between internal and external microphone operation while in chip modes ’10’ or ’11’.
2) Toggling in and out of powerdown/standby modes.
3) Toggling between chip modes ’10’ and ’11’ whenever external microphone operation is selected.
4) The insertion/removal of a headset while in chip modes ’10’ or ’11’ whenever external microphone operation is selected.
To avoid these potential pop issues, it is recommended to deselect the microphone input from CPOUT and ADC until the DC points stabilize.
L
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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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