EC5741 Datasheet, PDF (4/15 Pages) E-CMOS Corporation – Super Low Power, CMOS, Rail-to-Rail Operational Amplifier

Super Low Power, CMOS,
Rail-to-Rail Operational Amplifier
EC5741
Figure 3. Indirectly Driving a Capacitive Load with DC Accuracy
Differential amplifier
The differential amplifier allows the subtraction of two input voltages or cancellation of a signal common the
two inputs. It is useful as a computational amplifier in making a differential to single-end conversion or in
rejecting a common mode signal. Figure 4. shown the differential amplifier using EC5741.
Figure 4. Differential Amplifier
If the resistor ratios are equal (i.e. R₁=R₃ and R₂=R₄), then
Instrumentation Amplifier
The input impedance of the previous differential amplifier is set by the resistors R1, R2, R3, and R4. To
maintain the high input impedance, one can use a voltage follower in front of each input as shown in the
following two instrumentation amplifiers.
E-CMOS Corp. (www.ecmos.com.tw)
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3L03N-Rev.P001