SP304CS datasheet(10/12 Pages) SIPEX

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SIGNAL PROCESSING EXCELLENCE

SP304 CONFIGURATIONS IN LOOPBACK MODE

Two -Channel Full Duplex RS-232

One-Channel Full Duplex RS-232 &

One-Channel Full Duplex RS-422

LOOPBACK

The SP304 has a function called loopback, which is

essentially a chip self-test. However, by connecting

system test loops with the inputs and outputs of the

SP304, a system-level diagnostic can be run on

power-up or on command. The test loops can be

RIA1

ROA1

TOA1

TIA1

RIB1

ROB1

TOB1

TIB1

RS-232 LINE DRIVER

RS-232 RECEIVER

SELECT A = 0

SELECT B = 0

LB = 0 (ACTIVE)

RIA2

ROA2

TOA2

TIA2

RIB2

ROB2

TOB2

TIB2

RS-232 LINE DRIVER

RS-232 RECEIVER

RS-232 LINE DRIVER

RS-232 RECEIVER

RS-232 LINE DRIVER

RS-232 RECEIVER

RIA1

ROA1

TOA1

TIA1

RIB1

ROB1

TOB1

TIB1

RS-232 LINE DRIVER

RS-232 RECEIVER

SELECT A = 0

SELECT B = 1

LB = 0 (ACTIVE)

TOB2

RIB2

TOA2

TIA2

RIA2

ROA2

RS-422 LINE DRIVER

RS-422 RECEIVER

RS-232 LINE DRIVER

RS-232 RECEIVER

enabled and disabled allowing both system test and

operation with the same components. A maximum

data rate for loopback of 3kbps is recommended.

Loopback is a pin-programmable function, activated

byalogiclowontheLBpin(19). As shown in these

figures, the loopback function internally con-

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