WM8750-EV1M
POWER SUPPLIES
Using appropriate power leads with 4mm connectors, power supplies should be connected
as described in Table 1.
REF-DES
SOCKET NAME
SUPPLY
+5V
J8
J2
+5V
DBVDD
AVDD
+1.8V to +3.6V
+1.8V to +3.6V
+1.42V to +3.6V
+1.8V to +3.6V
0V
J4
J10
J47
J1
DCVDD
HPVDD
DGND
AGND
J5
0V
Table 1 Power Supply Connections
The DGND and AGND connections may be connected to a common GND on the supply with
no reduction in performance.
To reduce the supply connections that need to be attached to the EVB, sites L1 and L8 are
populated with 0R resistors shorting AVDD, HPVDD and DBVDD. In this configuration it is
recommended that the supply only be attached to AVDD. If separate supplies are required
the 0R resistors should be removed from sites L1 and L8.
Note: Refer to WM8750 datasheet for limitations on individual supply voltages.
Important: Exceeding the recommended maximum voltage can damage EVB
components. Under voltage may cause improper operation of some or all of the EVB
components.
BOARD FUNCTIONALITY
There are three options for inputting digital data into the WM8750 evaluation board. There is
a coaxial input (J19) via a standard phono connector or an optical input (U3) via a standard
optical receiver module. A direct digital input is also available via one side of a 2x8 pin
header (H1).
The analogue input signals are applied to the evaluation board via phono connectors J7
(RLINE_IN1), J12 (LLINE_IN1), J14 (RLINE_IN2), J22 (LLINE_IN2), J26 (RLINE_IN3) and
J45 (LLINE_IN3). Analogue inputs can also be applied to the evaluation board via 3.5mm
jack sockets J9 (MIC_IN1); J16 (MIC_IN2) and J30 (MIC_IN3).
There are two options for outputting digital data from the WM8750 evaluation board. There is
a coaxial output (J29) via a standard phono connector. The digital signals may also be
accessed via one side of a 2x8 pin header (H2).
The analogue outputs of the board are via phono connectors J43 (ROUT1), J44 (LOUT1),
J41 (LOUT2), J42 (ROUT2), J39 (MONO OUT) and J40 (OUT3). There is also an analogue
output via a 3.5mm jack socket J46 (HP_OUT).
All WM8750 device pins are accessible for easy measurement via the 2x4 pin headers (J13,
J15, J17 and J21) running up each side of the device.
Level-shift IC (U4) is used to shift the fixed +5V digital input from the CS8427 (U5) down to
the same level as DBVDD and vice-versa.
Rev 2.0, February 2005
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
