Datasheet

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Description

Self-Powered (default setting)

JP1: Shorting plug of jumper JP1 must be removed.

JP2–JP8: Shorting plugs of jumpers JP2–JP8 must be connected.

JP9, JP10, JP11: Shorting plugs of jumpers JP9, JP10, and JP11 must be connected on the SELF

side.

CN3 or TM1, TM2 external power supply:

External power supply must be connected either to CN3 or to TM1 and TM2.

= 4.5 V to 10 V. I

= 30 mA typical, 70 mA maximum.) A 3.3-V regulator IC is

mounted to provide a 3.3-V power supply for PCM2704/2705 and logic circuitry on

the board from the external power supply.

In the case of self-powered operation, device is enabled when the USB interface is

connected and HOST is set to High.

1.3.4 SPI Interface (PCM2705)

An SPI interface (MS, MC, MD) for operational control of the PCM2705 can be connected at CN1.

1.3.5 Suspend

Suspend status is indicated at the SSPND pin of CN1.

1.3.6 S/PDIF Output

USB audio data input to the PCM2704/2705 is output in S/PDIF format. This electrical output is sent to

U4, which converts the S/PDIF signal into light for optical transmission.

SLEU114– May 2011 PCM270xEVM-U

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