SP504EB Datasheet, PDF (4/18 Pages) Sipex Corporation – Evaluation Board Manual

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.
504/505 AppNote/03
New SP504/505 Evaluation Board
4
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