SP504EB datasheet(4/18 Pages) SIPEX

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504/505 AppNote/03

New SP504/505 Evaluation Board

V.35 MODE

SP504

The SP504 requires 150 ohm V.35 termination

resistors to be installed between SD(b) & ground,

ST(b) & ground and TT(b) and ground for com-

pliant V.35 operation. Resistors should be 1/4

watt 1% tolerance. Be sure to remove the V.35

termination resistors when using any other mode.

SP505

The SP505 contains all necessary V.35 termina-

tion resistors internally. Therefore, no external

termination resistors are necessary for the SP505

device for compliant V.35 operation.

V.11 (RS-422) MODE

SP504

The SP504 may require termination resistors to

be installed onto the receiver inputs for clock and

data signals. Per the V.11 specification, cable

termination is optional but is recommended to

reduce signal crosstalk and reflection on the

transmission line when operating at higher speeds

(over 300kbps). If needed, a 120ohm resistor

should be placed between the A and B inputs of

the clock and data receivers. Specifically, RD(a)

& RD(b), RT(a) & RT(b), and SCT(a) & SCT(b).

The resistors should be removed when not

operating in a mode using RS-422.

SP505

The SP505 contains all necessary V.11 termina-

tion resistors internally. Therefore, no external

termination resistors are necessary for the SP505

device for compliant V.11 operation.

USING THE DB-25 CONNECTOR

The DB-25 connector is configured as a DTE for

a EIA-530 pinout. In order to connect to other

DCE equipment or network analyzers (i.e. TTC's

Fireberd 6000A), the RxC receiver output must

loop back into the TxC driver input. The RxD

output can also be looped back to the TxD input.

If connecting the evaluation board to a

microcontroller such as the Motorola MC68360,

jumper wires of the driver inputs and receiver

outputs must connect to the uC's appropriate

pins.

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