WM8720
Production Data
RECOMMENDED EXTERNAL COMPONENTS
DVDD
AVDD
+
19
11
10
DVDD
AVDD
AGND
+
C1
C2
C3
C4
20
DGND
AGND
DGND
C5
4
5
6
7
9
ML/I2S
MC/IWL
MD/DM
RSTB
VOUTR
VOUTL
AC-Coupled
Output to
External LPF
+
C6
Software I/F or
Hardware Control Pins
12
+
AVDD
R1
18
1
MODE
PWDN
MUTE
8
3
ZERO
TEST
CAP
17
13
+
2
SCKI
BCKIN
DIN
C7
C8
14
15
16
Audio Serial Data I/F
AGND
LRCIN
NOTES:
1. AGND and DGND should be connected as close to the WM8720 as possible.
2. C2, C3 and C7 should be positioned as close to the WM8720 as possible.
3. Capacitor types should be carefully chosen. Capacitors with very low ESR are
recommended for optimum performance.
Figure 8 External Components Diagram
RECOMMENDED EXTERNAL COMPONENTS VALUES
COMPONENT
REFERENCE
SUGGESTED
VALUE
DESCRIPTION
C1 and C4
C2 and C3
C5 and C6
C7
10µF
0.1µF
10µF
0.1µF
10µF
10kΩ
Output AC coupling caps to remove midrail DC level from outputs.
Reference de-coupling capacitors for CAP pin.
C8
R1
Resistor to AVDD for open drain output operation.
Table 13 External Components Description
PD Rev 4.0. February 2005
15
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
