参数资料
型号: WLA49VVA
厂商: National Semiconductor Corporation
元件分类: 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: 音频子系统的双模单声道立体声耳机和扬声器放大器的高效率和多功能模数转换器
文件页数: 39/112页
文件大小: 5017K
代理商: WLA49VVA
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
Field
Description
0
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
Commanding Type
0
-law
1
A-law
1
COMPAND
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.
2
ADC_MUTE
If set the analog inputs to the ADC are muted.
5:3
AGC_FRAME_TIME
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
Time (ms)
000
2
96
001
2
128
010
2
192
011
2
256
100
2
384
101
2
512
110
2
768
111
2
1000
6
ADC_I2S_M
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.
7
AUDIO_IF_2_16BIT
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.
Note 15: Refer to the AGC overview for further detail.
LM4935
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