LMC6462_14 Datasheet, PDF (18/32 Pages) National Semiconductor (TI) – LMC6462 Dual/LMC6464 Quad Micropower, Rail-to-Rail Input and Output CMOS

LMC6462, LMC6464
SNOS725D – MAY 1999 – REVISED MARCH 2013
www.ti.com
A small valued potentiometer is used in series with R_G to set the differential gain of the three op-amp
instrumentation circuit in Figure 48. This combination is used instead of one large valued potentiometer to
increase gain trim accuracy and reduce error due to vibration.
Figure 48. Low Power Three Op-Amp Instrumentation Amplifier
A two op-amp instrumentation amplifier designed for a gain of 100 is shown in Figure 49. Low sensitivity
trimming is made for offset voltage, CMRR and gain. Low cost and low power consumption are the main
advantages of this two op-amp circuit.
Higher frequency and larger common-mode range applications are best facilitated by a three op-amp
instrumentation amplifier.
9.95k
191:
10k,
0.1%
50:
CMRR
Trim
-
A1
V_CM + 1/2V_D
+
10:
Gain
Trim
10k,
0.1%
V_CM - 1/2V_D
10k, 0.1%
-
A2
+
V_OUT = 100V_D
Figure 49. Low-Power Two-Op-Amp Instrumentation Amplifier
18
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