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: 72/112页
文件大小: 5017K
代理商: WLA49VVA
12.0 Status & Control Registers (Continued)
12.38 DC VOLUME CONFIGURATION REGISTER
This register is used to control the DC volume control system.
TABLE 39. DC_VOLUME (0x21h)
Bits
Field
Description
0
DC_VOL_ENB
Enables the DC volume control system to use the voltage applied on the
VSAR 1 pin to set the gain of the DC volume control. (Note 32)
1
DC_VOL_EFFECT
Selects which volume is altered:
DC_VOL_EFFECT
Source
0
AUX/DAC
1
CPI
3:2
MAX_LEVEL
Programs the maximum level that can be applied by the system
MAX_LEVEL
LEVEL
00
2
0dB
01
2
3 dB
10
2
6 dB
11
2
12 dB
Note 32: The correlation between the voltage on VSAR1 to the attenuation on the AUX/DAC channel is as follows:
201341P4
FIGURE 16. DC Volume Transfer Function For AUX/DAC
LM4935
www.national.com
62
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