Production Data

WM8782

w

PD, April 2010, Rev 4.7

19

APPLICATIONS INFORMATION

RECOMMENDED EXTERNAL COMPONENTS

Figure 16 External Components Diagram

RECOMMENDED EXTERNAL COMPONENTS VALUES

COMPONENT

REFERENCE

SUGGESTED

VALUE

DESCRIPTION

C1 and C8

10

F

De-coupling for DVDD and AVDD

C2 and C7

0.1

F

De-coupling for DVDD and AVDD

C5 and C6

10

F

Analogue input AC coupling caps

R1

10k



Current limiting resistors

R2 and R5

10k



Internal op-amp input resistor

R3 and R6

5k



Internal op-amp feedback resistor

R4

3.3k



Common mode resistor

C4

0.1

F

Reference de-coupling capacitors for VMID pin

C3

10

F

C9

0.1

F

Reference de-coupling capacitors for VREFP pin

C10

10

F

Table 11 External Components Description

The above Table 11 shows resistor values which will give a gain of 0.5. This assumes an input signal of 2Vrms to C4 and

C5.