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WM8776 데이터시트(PDF) 39 Page - Wolfson Microelectronics plc

부품명 WM8776
상세설명  24-bit, 192kHz Stereo CODEC with 5 Channel I/P Multiplexer
PDF  57 Pages
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제조업체  WOLFSON [Wolfson Microelectronics plc]
홈페이지  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8776 데이터시트(HTML) 39 Page - Wolfson Microelectronics plc

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Production Data
WM8776
w
PD Rev 4.0 April 2005
39
ADC INPUT MIXER AND POWERDOWN CONTROL
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R21 (15h)
0010101
ADC Input Mux
4:0
AMX[4:0]
00001
ADC left channel input mixer
control bits (see Table 16)
R13 (0Dh)
0001101
Powerdown Control
6
AINPD
0
Input mux and buffer powerdown
0: Input mux and buffer
enabled
1: Input mux and buffer
powered down
Register bits AMX[4:0] control the left and right channel inputs into the stereo ADC. The default is
AIN1. One bit of AMX is allocated to each stereo input pair to allow the signals to be mixed before
being digitised by the ADC. For example, if AMX[4:0] is 00101, the input signal to the ADC will be
(AIN1L+AIN3L) on the left channel and (AIN1R+AIN3R) on the right channel.
However if the analogue input buffer is powered down, by setting AINPD, then all 5-channel mixer
inputs are switched to buffered VMIDADC.
AMX[4:0]
LEFT ADC INPUT
RIGHT ADC INPUT
00001
AIN1L
AIN1R
00010
AIN2L
AIN2R
00100
AIN3L
AIN3R
01000
AIN4L
AIN4R
10000
AIN5L
AIN5R
Table 16 ADC Input Mixer
AIN1L/R
AIN2L/R
AIN3L/R
AIN4L/R
AIN5L/R
AMX[0]
AMX[1]
AMX[2]
AMX[3]
AMX[4]
Figure 25 ADC Input Mixer



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