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
文件頁數(shù)： 32/112頁
文件大?。?/td> 5017K
代理商： LM4935
12.0 Status & Control Registers
(Continued)
12.11 ADC_2 CONFIGURATION REGISTER
This register is used to control the LM4935’s audio ADC.
TABLE 12. ADC_2 (0x07h)
Bits
0
Field
Description
ULAW/ALAW
If COMPAND is set then the data across the PCM interface to the DAC and from the ADC is
companded as follows:
ULAW/ALAW
0
1
If set the 16 bit PCM data from the ADC is companded before the PCM interface and the PCM
data to the DAC is treated as companded data.
If set the analog inputs to the ADC are muted.
This sets the frame time to be used by the AGC algorithm. In a given frame, the AGC’s peak
detector determines the peak value of the incoming microphone audio signal and compares this
value to the target value of the AGC defined by AGC_TARGET (bits [3:1] of register (0x08h)) in
order to adjust the microphone preamplifiers gain accordingly. AGC_FRAME_TIME basically sets
the sample rate of the AGC to adjust for a wide variety of speech patterns. (Note 15)
AGC_FRAME_TIME
000
2
001
2
010
2
011
2
100
2
101
2
110
2
111
2
If set the DAC clock system is enabled to drive the I2S in master mode. The Point B frequency
should be double that at Point C. This bit should be set when using the I2S interface in master
mode to read SAR information whenever both the audio ADC and DAC are inactive.
If set the PCM and I2S interfaces are 16 bits per word in master mode. The 2 last clock cycles per
word are 25% shorter to allow generation.
Commanding Type
μ-law
A-law
1
COMPAND
2
ADC_MUTE
AGC_FRAME_TIME
5:3
Time (ms)
96
128
192
256
384
512
768
1000
6
ADC_I2S_M
7
AUDIO_IF_2_16BIT
Note 15:
Refer to the
AGC overview
for further detail.
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)
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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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