Quick Start Procedure - Linear Technology DC1794A Demo Manual

qUick stArt proceDUre

Demonstration circuit 1794A is easy to set up and evalu-
ate the performance of the LTM2885. 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 JP6)
JP1 (TE pin) place in ON position
JP2 (DE pin) place in ON position
JP3 (RE pin) place in ON position
JP4 (ON pin) place in ON position
JP5 (SLO pin) place in OFF position
JP6 (Duplex header) place in HALF DUPLEX position
OSCOPE
Arrow.com. Arrow.com. Arrow.com.
Downloaded from Downloaded from Downloaded from
+
VIN
–
FUNCTION
GENERATOR
DEMO MANUAL DC1794A
2. With power off, connect the input power supply to V
and GND turrets.
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
be measured between probe points V
5. Once the proper output voltage is established, connect a
function generator to TXD turret and set to square wave
with a low of 0V, high = V
(20Mbps). Enable output of function generator.
6. Connect oscilloscope to RXD turret and observe 10MHz
waveform. This demonstration shows data that is
transmitted from TXD, loops back through half-duplex
connection, and out of RXD.
Figure 2. Demo Board Setup
CC
= 5V, this can
CC2
and GND2.
CC2
. Set frequency to 10MHz
CC
dc1794afa
3