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| WM8722_01 Datasheet, PDF (22/24 Pages) Wolfson Microelectronics plc – Stereo DAC with Integrated Tone Generator and Line/Variable Level Outputs | |||
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WM8722
RECOMMENDED EXTERNAL COMPONENTS
Advanced Information
DVDD
+
C1
C2
DGND
16 DVDD
6 DGND
AVDD 11
C3
AGND 10
AVDD
+
C4
AGND
SPI or 2-wire
Interface
DVDD
2-wire Interface
SPI Interface
R1
DGND
Audio Serial Data I/F
2 MC
3 MD
4 LATCH
5 BUSY
VAROUTR 9 C5
+
VAROUTL 12 C6
+
WM8722
1 TCLK
17 DIN
LINEOUTR 8 C7
+
18 LRCIN
19 BCKIN
LINEOUTL 13 C8
+
20 SCKI
AC-Coupled
Variable Outputs
to External LPF
AC-Coupled
Line Level outputs
to External LPF
C9
7 MXINR
C10
14 MXINL
Notes:
1. AGND and DGND should be connected as close to the WM8722 as
2. C2, C3, C9, C10 and C11 should be positioned as close to the WM8722 as
3. Capacitor types should be carefully chosen. Capacitors with very low
recommended for optimum
CAP 15
C11
+
C12
AGND
Figure 11 External Components Diagram
RECOMMENDED EXTERNAL COMPONENTS VALUES
COMPONENT
REFERENCE
C1 and C4
C2 and C3
C5, C6, C7 and C8
C11
C12
R1
C9,C10
SUGGESTED
VALUE
10µF
0.1µF
10µF
0.1µF
10µF
10kâ¦
1µF
DESCRIPTION
De-coupling for DVDD and AVDD.
De-coupling for DVDD and AVDD.
Output AC coupling caps to remove midrail DC level from outputs.
Reference de-coupling capacitors for CAP pin.
AC coupling capacitors for setting DC inputs level of analogue
Table 11. External Components Description
w
AI Rev 2.1 June 2001
22
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