WM8733
RECOMMENDED EXTERNAL COMPONENTS
1
FROM AUDIO
PROCESSOR
SCKI
14
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LRCIN
DIN
256fs/384fs/512fs CLK
2
FORMAT
13
3
BCKIN
DEEMPH
12
4
10µF
ANALOGUE
OUTPUT FOR
RIGHT
CHANNEL
SEL0
WM8733
SEL1
11
(diode allows automute operation)
+
5
CAP
MUTE
10
External
LPF
ANALOGUE
OUTPUT FOR
LEFT CHANNEL
External
LPF
6
VOUTR
VOUTL
9
7
GND
VDD
8
GND
10µF
0.1µF
VDD
Figure 5 Applications Diagram
DETAIL OF APPLICATION DIAGRAM SHOWING THE EXTERNAL LOW POWER FILTER
External LPF
x2 for Stereo Operation
-
1500pF
+
-
10kΩ
Vin
10kΩ
680pF
+
10kΩ
100pF
Filtered
Analogue
Output
Figure 6 Third-Order Low Pass Filter (LPF) Example
An external low pass filter is recommended if the device is driving a wide band amplifier, as shown in
Figure 6. In some applications, second-order or passive RC filter may be adequate.
WOLFSON MICROELECTRONICS LTD
PP Rev 1.3 July 2000
10
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
