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WM8750LEFL/R 数据表(PDF) 17 Page - Wolfson Microelectronics plc

部件名 WM8750LEFL/R
功能描述  STEREO CODEC FOR PORTABLE AUDIO APPLICATIONS
PDF  56 Pages
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制造商  WOLFSON [Wolfson Microelectronics plc]
网页  http://www.wolfsonmicro.com
标志 WOLFSON - Wolfson Microelectronics plc

WM8750LEFL/R 数据表(HTML) 17 Page - Wolfson Microelectronics plc

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WM8750L
PP Rev 1.77 May 2003
17
DC MEASUREMENT
For DC measurements (for example, battery voltage monitoring), the input signal at the LINPUT1
and/or RINPUT1 pins can be taken directly into the respective ADC, bypassing both PGA and
microphone boost. The ADC output then becomes unsigned relative to AVDD, instead of being a
signed (two’s complement) number relative to VREF. Setting L/RDCM will override L/RINSEL. The
input range for dc measurement is AGND to AVDD.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
7:6
LINSEL
00
Left Channel Input Select
00 = LINPUT1
01 = LINPUT2
10 = LINPUT3
11 = Differential
R32 (20h)
ADC Signal
Path Control
(Left)
5:4
LMICBOOST
00
Left Channel Microphone Gain Boost
00 = Boost off (bypassed)
01 = 13dB boost
10 = 20dB boost
11 = 29dB boost
7:6
RINSEL
00
Right Channel Input Select
00 = RINPUT1
01 = RINPUT2
10 = RINPUT3
11 = Differential
R33 (21h)
ADC Signal
Path Control
(Right)
5:4
RMICBOOST
00
Right Channel Microphone Gain Boost
00 = Boost off (bypassed)
01 = 13dB boost
10 = 20dB boost
11 = 29dB boost
Table 2 Input Software Control
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
5
RDCM
0
Right Channel DC Measurement
0 = Normal Operation, PGA Enabled
1 = Measure DC level on RINPUT1
R31 (1Fh)
ADC input Mode
4
LDCM
0
Left Channel DC Measurement
0 = Normal Operation, PGA Enabled
1 = Measure DC level on LINPUT1
Table 3 DC Measurement Select
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R31 (1Fh)
ADC Input Mode
8
DS
0
Differential input select
0: LINPUT1 - RINPUT1
1: LINPUT2 – RINPUT2
Table 4 Differential Input Select



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