LT1990 datasheet(13/16 Pages) AD

13 / 16 page

LT1990-10

Rev 0

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APPLICATIONS INFORMATION

–

LT1990-10

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

discretesolutions.Inapplicationswherethecommonmode

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.

LT1990 Datasheet(PDF) 13 Page - Analog Devices