wm8775 Wolfson Microelectronics plc, wm8775 Datasheet - Page 36

• Manufacturer Part Number: wm8775
• Description: 24-bit, 96khz Adc With 4 Channel I/p Multiplexer
• Manufacturer: Wolfson Microelectronics plc

WM8775
APPLICATIONS INFORMATION
EXTERNAL CIRCUIT CONFIGURATION
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In order to allow the use of 2V rms and larger inputs to the ADC inputs, a structure is used that uses
external resistors to drop these larger voltages. This also increases the robustness of the circuit to
external abuse such as ESD pulse. Figure 28 shows the ADC input multiplexor circuit with external
components allowing 2Vrms inputs to be applied.
Figure 28 ADC Input Multiplexor Configuration
SELECTOR
SOURCE
INPUTS
10uF
10uF
10uF
10uF
10uF
10uF
10uF
10uF
10K
10K
10K
10K
10K
10K
10K
10K
5K
5K
AINOPR
AIN1R
AIN2R
AIN3R
AIN4R
AINOPL
AINVGR
AINVGL
AIN1L
AIN2L
AIN3L
AIN4L
PD, Rev 4.4, October 2008
Production Data
36