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dc1503fa

DEMO MANUAL DC1503A

QUICK START PROCEDURE

Demonstration circuit DC1503A is easy to set up to evalu-

ate the performance of the LTM2881. Refer to Figure 2

for proper measurement equipment setup and follow the

procedure below:

Use a short ground lead on the oscilloscope probe when

measuring input or output voltage ripple or high speed

signals.

1. Place jumpers in the following positions: (all are default

except JP1, JP2, JP6 and JP8)

JP1

ON

JP2

VCC (Note: Logic signals referenced to VCC)

JP3

ON

JP4

OUT

JP5

ON

JP6

EXT

JP7

ON

JP8

ON

JP9

ON

JP10 FAST

JP11 HI

SW1 HALF DUPLEX

2. With power off, connect the input power supply to VCC

and GND.

3. Turn on the power at the input.

Note: Make sure that the input voltage does not exceed

6V.

4. Check for the proper output voltages. VCC2 = 5V, LED

D1 is On, LED D2 is On.

5. Once the proper output voltages are established, connect

a function generator to terminal DI and set to square

wave with a low of 0V, high = VCC, termination is Hi-Z.

Set Frequency to 10MHz (20Mbps). Enable output of

function generator.

6. Connect oscilloscope to terminal RO and observe wave-

form at 10MHz. This demonstration shows data that

transmits from DI, loops back through the half-duplex

configuration, and out of RO.

Figure 1. RO Output

RO

1V/DIV

50ns/DIV

DC1503 F01