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dc1746af

DEMO MANUAL DC1746A

QUICK START PROCEDURE

Figure 2. Demo Board Setup

Demonstration circuit 1746A is easy to set up and evalu-

ate the performance of the LTM2881. Refer to Figure 2

for proper measurement equipment setup and follow the

procedure below.

NOTE: When measuring the input or output voltage ripple

or high speed signals, care must be taken to avoid a long

ground lead on the oscilloscope probe.

1. Install jumpers in following positions: (all are default

except JP5 and SW1)

JP1 ON

JP2 ON

JP3 ON

JP4 ON

JP5 OFF

SW1 HALF DUPLEX

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

and GND on pin header J1.

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 voltage. VCC2 = 5V, this can

be measured between probe points V2 and C.

5. Once the proper output voltage is established, connect

a function generator to pin DI and set to square wave

with a low of 0V, high = VCC. Set frequency to 10MHz

(20Mbps). Enable output of function generator.

6. Connect oscilloscope to pin RO and observe 10MHz

waveform. This demonstration shows data that is

transmitted from DI, loops back through half-duplex

connection, and out of RO.