ISL28272 Intersil Corporation, ISL28272 Datasheet - Page 13

• Manufacturer Part Number: ISL28272
• Description: Dual Micropower, Single Supply, Rail-to-rail Input And Output Rrio Instrumentation Amplifier
• Manufacturer: Intersil Corporation

Unused Channels
The ISL28271 and 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 R
terminals to ground (as shown in Figure 40).
FIGURE 40. PREVENTING OSCILLATIONS IN UNUSED
CHANNELS
F
RG
and R
FB+
FB-
IN+
IN-
G
+
+
-
resistors and tieing the input
-
13
RF
ISL28271, ISL28272
August 17, 2007
FN6390.2