SP302CS datasheet(14/18 Pages) SIPEX

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SIGNAL PROCESSING EXCELLENCE

SP301 CONFIGURATIONS IN LOOPBACK MODE

One-Channel Full Duplex RS-232 &

One-Channel Full Duplex RS-422

Opposite Drivers

Two-Channel Full Duplex RS-422

shown in these figures, the loopback function

internally connects the driver outputs to the

corresponding receiver inputs, and switches the

output pin to a resistive divider of 10k

Ωnominal

impedance from V

EE to ground. Receiver out-

puts are left active for signal verification.

During loopback, the receiver inputs are tied to

ground via a 5k

Ω pulldown resistor. To mini-

mize loopback errors, the receiver inputs must

be limited to

±10V swings.

RIA1

ROA

TOA1

TIA

RIB1

ROB

TOB1

TIB

RS-232 LINE DRIVER

RS-232 RECEIVER

TOA2

RIA2

SELECT A = 1

SELECT B = 0

LB = 0 (ACTIVE)

VEE

10k

VEE

10k

VEE

10k

RS-422 LINE DRIVER

RS-422 RECEIVER

RS-422 LINE DRIVER

RS-422 RECEIVER

RIB1

ROB

RIB2

TOB1

TIB

TOB2

SELECT A = 1

SELECT B = 1

LB = 0 (ACTIVE)

VEE

10k

VEE

10k

RS-422 LINE DRIVER

RS-422 RECEIVER

RIA1

ROA

RIA2

TOA1

TIA

TOA2

VEE

10k

VEE

10k

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