WM8728
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RECOMMENDED EXTERNAL COMPONENTS
DVDD
7
AVDD
+
10
14
DVDD
DGND
AVDD
+
C1
C2
VREFP
6
C3
C4
C5
9
AGND
DGND
13
VREFN
AGND
15
20
19
18
17
CSBIWL
LATI2S
Software I/F or
Hardware Control
SCKDSD
SDIDEM
MUTEB
C6
8
VOUTR
VOUTL
AC-Coupled
VOUTR/L
to External LPF
Software/hardware
control mode select
16
MODE
WM8728
C7
11
1
4
LRCIN
MCLK
3
2
Audio Serial Data I/F
BCKIN
DIN
5
12
ZERO
VMID
+
C8
C9
AGND
Notes:
1. AGND and DGND should be connected as close to the WM8728 as possible.
2. C2, C3, C4 and C8 should be positioned as close to the WM8728 as possible.
3. Capacitor types should be carefully chosen. Capacitors with very low ESR are
recommended for optimum performance.
Figure 30 External Components Diagram
RECOMMENDED EXTERNAL COMPONENTS VALUES
COMPONENT
REFERENCE
SUGGESTED
VALUE
DESCRIPTION
C1 and C5
C2 to C4
C6 and C7
C8
10µF
0.1µF
10µF
0.1µF
10µF
De-coupling for DVDD and AVDD/VREFP
De-coupling for DVDD and AVDD/VREFP
Output AC coupling caps to remove midrail DC level from outputs.
Reference de-coupling capacitors for VMID pin.
C9
Table 22 External Components Description
WOLFSON MICROELECTRONICS LTD
PP Rev 1.2 April 2001
25
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
