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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 V
CC
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. V
CC2
= 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 = V
CC
. 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.
