WM8750-EV1M Ver la hoja de datos (PDF) - Wolfson Microelectronics plc

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WM8750-EV1M

Evaluation Board User Handbook

Wolfson Microelectronics plc 

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

J8

+5V

J2

DBVDD

J4

AVDD

J10

DCVDD

J47

HPVDD

J1

DGND

J5

AGND

Table 1 Power Supply Connections

SUPPLY

+5V

+1.8V to +3.6V

+1.8V to +3.6V

+1.42V to +3.6V

+1.8V to +3.6V

0V

0V

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.

w

Rev 2.0, February 2005

5

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