WM8750-EV1M
ADDITIONAL WM8750-EV1B SETUP RECOMMENDATIONS
ADC TO DAC LOOPBACK
Setting up the WM8750-EV1 in loopback mode allows an analogue signal to be applied to
L/RLINE_IN1, passed through the ADC, looped into the DAC and output on the L/ROUT
outputs.
DBVDD
+1.8V
to
AVDD
+1.8V
to
DGND
+3.6V
+3.6V
AGND
PARALLEL PORT
J5
J4
J1
J2
+5V
J8
J6
RLINE
IN1
DCVDD
+1.42V
to
SW1
P E O
N
0
J10
SW3
6
4
5
3
1
2
1
+3.6V
SW2
J11
SW4
LLINE
IN1
H1
J13
RLINE -
IN2
SW6
J17
J15
SW5
SW7
J18
J20
ADCDAT
and
DACDAT
need to be
linked.
OPT
_IN
LLINE
IN2
J24
J23
The SPDIF input is
required to provide
clocks for the
WM8750 audio
interface.
J21
J25
SPDIF_
IN
H2
RLINE
IN3
SW8
SW9
SW27
SW28
1
1
J33
J32
SPDIF_
OUT
1
1
J35
J34
J37
1
1
J31
SW36
LLINE
IN3
J38
1
1
J47
HPVDD
+1.8V
to
+3.6V
Figure 32 Recommended ADC to DAC Loopback Setup
Note: Pin 6 of H1 MUST be linked to pin 9 of H2. A digital input must also be applied to U3
or J19 so that the correct clocks are supplied to the WM8750.
Rev 2.0, February 2005
42
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
