ISL28271 Datasheet, PDF (13/14 Pages) Intersil Corporation – Dual Micropower, Single Supply, Rail-to- Rail Input and Output (RRIO) Instrumentation Amplifier

ISL28271, ISL28272
the in-amp will shutdown when EN pin is pulled above 2V,
and will power up when EN bar is pulled below 0.8V.
Unused Channels
The ISL28271and ISL28272 are Dual channel op-amps. If
the application only requires one channel when using the
ISL28271 or ISL28272, the user must configure the unused
channel to prevent it from oscillating. The unused channel
will oscillate if the input and output pins are floating. This will
result in higher than expected supply currents and possible
noise injection into the channel being used. The proper way
to prevent this oscillation is to configure the feedback pins
(FB+, FB-) with the minimum gain stable values for the
amplifier with RF and RG resistors and tieing the input
terminals to ground (as shown in Figure 40).
IN+
+
IN-
-
FB+ ₊
FB- _-
RG
RF
FIGURE 40. PREVENTING OSCILLATIONS IN UNUSED
CHANNELS
13
FN6390.0
December 8, 2006