rev. 7/7/03

SP508 Evaluation Board Manual

© Copyright 2003 Sipex Corporation

3

SP508 EVALUATION BOARD

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

DTE Connector

σ DB-25 Male, DCE Connector σ DB-

25 Female

1

13

14

25

BOARD LAYOUT

1. The SP508 Evaluation board takes ad-

vantage of the products PCB friendly flow

through pinout in its design as shown in

Figure 1.

2. The SP508 Evaluation Board has been

designed to easily and conveniently provide

access to all inputs and outputs under test.

3. Figure 1 is a block diagram of the evalu-

ation board showing the layout of the SP508

Evaluation Board. The block diagram shows

the location of the driver and receiver ac-

cess points as well as the DIP switches, V

GND and the DB-25 Connector.

4. I/O Pinouts

The SP508 Evaluation Board has been de-

signed to easily and conveniently provide

access to all inputs and outputs to the device

under test. Position the Board with the DB-

25 connector at the top and the Dip switches

at the bottom. From this orientation , all

driver inputs and outputs are on the right-

hand side and all receiver inputs and out-

puts are on the left-hand side eof the Board.

4.1. Each Driver has probe points for the

input and outputs. There is a ground buss to

the right of the drive outputs for the addition

of loads to the driver outputs and to jumper

the V.35 that is associated with the SD, TT,

and ST driver.

Each V.35 driver has a

separate ground for the V.35 termination

network internal to the device.

4.2. Each Receiver has probe points for the

inputs and outputs. there is a ground buss

to the left of the receiver outputs and a

separate pin for the V.10 termination ground.

5. At the bottom of the board is a series of

six(6) DIP switches. The DIP switch on the

far left is for D_LATCH and TERM_OFF.

Each driver and receiver has its own indi-

vidual enable pin.

The DIP switches to

control the enable pins are located as the

top center bank of switches for the driver and

the middle center bank of switches for the

receiver.

The bottom center set of DIP

switches is for the 3 bit decoder and the

loopback control pin. The right hand DIP

switches allow the user to tie the ST driver

outputs to the TxC receiver inputs and the

RRC driver outputs to the RRT receiver

inputs.

6. Also located on the SP508 evaluation

board are the four 10uf charge pump capaci-

tors, a 10uf bypass capacitor for V

50Ω termination resistor.

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

connector used to connect to a communica-

tion analyzer such as the TTC Firebird 6000.