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參數(shù)資料
| 型號(hào)： | LM4935 |
| 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)： | 37/112頁(yè) |
| 文件大小： | 5017K |
| 代理商： | LM4935 |
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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)PDF資料 |
PDF描述 |
|---|---|
| LM4935WL | Audio Sub-System with Dual-Mode Stereo Headphone and Mono High Efficiency Loudspeaker Amplifiers and Multi-Purpose ADC |
| LM4935WLX | Audio Sub-System with Dual-Mode Stereo Headphone and Mono High Efficiency Loudspeaker Amplifiers and Multi-Purpose ADC |
| LM4936 | Stereo 2W Audio Power Amplifiers with Volume Control and Selectable Control Interface (SPI or I2C) |
| LM4951 | Wide Voltage Range 1.8 Watt Audio Amplifier |
| LM4953 | Ground-Referenced, Ultra Low Noise, Ceramic Speaker Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM49350 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Performance Audio Codec Sub-System with a Ground-Referenced Stereo Headphone Amplifier |
| LM49350RL | 制造商:Texas Instruments 功能描述:Audio Codec 1ADC / 1DAC 36-Pin uSMD T/R 制造商:Texas Instruments 功能描述:AUDIO CODEC SUBSYSTEM 36MICRO SMDXT |
| LM49350RL/NOPB | 功能描述:接口—CODEC Hi Perf Audio Codec Subsystem RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| LM49350RL/NOPB | 制造商:Texas Instruments 功能描述:Audio Codec IC |
| LM49350RLEVAL | 功能描述:音頻 IC 開發(fā)工具 LM49350RL EVAL BOARD RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V |
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