SP3508CF datasheet(3/13 Pages) SIPEX

3 / 13 page

Rev. 8/28/03

SP3508 Evaluation Board Manual

SP508 EVALUATION BOARD

Figure 2. RS-232 & EIA530 Connector (ISO 2110), DTE

Connector

σ DB-25 Male, DCE Connector σ DB-25

Female

BOARD LAYOUT

1. The SP3508 Evaluation Board has been

designed to easily and conveniently provide

access to all inputs and outputs under test.

2. Figure 1 is a schematic of the evaluation

board. The schematic shows the location of

the driver and receiver access points as well

as the Jumpers, V

CC, GND and the DB-25

Connector.

3. Figure 3 to Figure 6 shows the layout of

the SP3508 Evaluation Board.

4. I/O Pinouts

The SP3508 Evaluation Board has been

designed to easily and conveniently provide

access to all inputs and outputs to the device

under test. Each Driver has probe points for

the inputs and outputs. Each Receiver has

probe points for the inputs and outputs.

5. At the left of the board is a set of jumpers.

Each driver and receiver has its own indi-

vidual enable pin. This set of jumpers con-

trols the enabling and disabling of each

driver of receiver. Another set of jumpers is

to configure the 3 bit decoder, to enable/

disable loopback, to enable/disable latch

and to enable/disable term_off functions. In

addition, JP1 - JP4 allow the user to choose

which signals the user can access through

the DB-25 connector. JP5 allows the user to

set the driver input to GND, V

CC or external

source.

6. Also located on the SP3508 evaluation

board are six 1uf charge pump capacitors, a

1µF bypass capacitor for V

CC and two 50Ω

termination resistors.

7. 1 Pomona BNC female connector is

mounted on the board to provide input signal

for evaluation.

8. Figure 2 shows a RS-232 & EIA530 DB-

25 Connector.

9. Table 1 shows the pinout of the DB-25

connector used to connect to a communica-

tion analyzer such as the TTC Firebird 6000.

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