SP302CS datasheet(13/18 Pages) SIPEX

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SIGNAL PROCESSING EXCELLENCE

SP301 CONFIGURATIONS IN LOOPBACK MODE

Two -Channel Full Duplex RS-232

One-Channel Full Duplex RS-232 &

One-Channel Full Duplex RS-422

LOOPBACK

Both the SP301 and SP302 have a function called

loopback, which is essentially a chip self-test. How-

ever, by connecting system test loops with the inputs

and outputs of the SP301/302, a system-level diag-

nostic can be run on power-up or on command. The

RIA1

ROA

TOA1

TIA

RIB1

ROB

TOB1

TIB

RS-232 LINE DRIVERS

RS-232 RECEIVERS

SELECT A = 0

SELECT B = 0

LB = 1

RIA1

ROA

TOA1

TIA

RIB1

ROB

TOB1

TIB

TOB2

RIB2

SELECT A = 0

SELECT B = 1

LB = 0 (ACTIVE)

VEE

10k

VEE

10k

VEE

10k

RS-232 LINE DRIVER

RS-232 RECEIVER

RS-422 LINE DRIVER

RS-422 RECEIVER

test loops can be enabled and disabled allowing both

system test and operation with the same components.

A maximum data rate for loopback of 3kbps is

recommended.Loopbackisapin-programmablefunc-

tion, activated by a logic low on the LB pin (19). As

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