LT1990-10
13
Rev 0
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APPLICATIONS INFORMATION
–
+
LT1990-10
1k
2k
199010 F01
Figure 1. Optional CMRR Trim
in series with the other. The trim range of this configura-
tion is ±0.1% for the internal input resistor matching.
This technique using the LT1990
-10 offers a much more
finely resolved correction than is available from ordinary
discrete solutions. In applications where the common mode
is relatively constant and large, this same configuration
can be treated as an offset adjustment.
Output Stability with Capacitive Loads
The LT1990-10 is internally compensated to drive high
capacitive loads of at least 2nF under all output load
-
ing conditions when the output is in its linear region or
saturated to V
–
. However, a small oscillation may occur if
the output is saturated to V
+
with capacitive loads greater
than 300pF at higher load currents and higher supply
voltages. A 10nF capacitor in series with a 600Ω resistor
placed between the output and ground will compensate
the amplifier for capacitive loads up to 10nF at all output
loading conditions. See the region of instability in the
Typical Performance Characteristics section.
