wm8770 Wolfson Microelectronics plc, wm8770 Datasheet - Page 49

• Manufacturer Part Number: wm8770
• Description: 24-bit, 192khz 8-channel Codec With Volume Control
• Manufacturer: Wolfson Microelectronics plc

Production Data
EXTERNAL CIRCUIT CONFIGURATION
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In order to allow the use of 2V rms and larger inputs to the ADC and AUX 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 40 shows the ADC input multiplexor circuit with external components allowing 2Vrms inputs to
be applied.
Figure 40 ADC Input Multiplexor Configuration
Figure 41 Shows the 5.1Channel Input Multiplexor Configuration
LINE INPUTS
SYSTEM
AUX 5.1
SELECTOR
SOURCE
INPUTS
10uF
10uF
10uF
BYPASSL/R
AUX3L/R
AUX1L/R
AUX2L/R
10uF
10uF
10uF
10uF
10uF
10uF
10uF
10uF
10uF
10uF
DAC1L/R
DAC3L/R
DAC2L/R
10K
10K
10K
10K
10K
10K
10K
10K
10K
10K
5K
5K
AINOPL
AINVGL
AIN1L
AIN2L
AIN3L
AIN7L
AIN8L
AINOPR
AIN1R
AIN2R
AIN3R
AINVGR
AIN7R
AIN8R
4K
4K
4K
4K
4K
4K
4K
MX1[1]
MX1[0]
MX1[2]
MX2[1]
MX2[0]
MX3[1]
MX3[0]
4K
4K
4K
PD Rev 4.2 March 2008
WM8770
49