Typical Application Circuits

Differential Amplifier

Figure 5. Differential Amplifier

The circuit shown in Figure 5 performs the difference function. If the resistors

ratios are equal R4/R3 = R2/R1, then:

VOUT = (Vp – Vn) × R2/R1 + VREF

Instrumentation Amplifier

Figure 6. Instrumentation Amplifier

The AD863xA family is well suited for conditioning sensor signals in battery-

powered applications. Figure 6 shows a two op-amp instrumentation amplifier, using

the AD863xA op-amps. The circuit works well for applications requiring rejection of

common-mode noise at higher gains. The reference voltage (VREF) is supplied by a

low-impedance source. In single voltage supply applications, the VREF is typically VS/2.

Buffered Chemical Sensors

480

μA, 6.5MHz, RRIO CMOS Operational Amplifiers

UMW

AD8631,AD8632,AD8634

R

www.umw-ic.com

11

UTD Semiconductor Co.,Limited