AD8236ARMZ-R71 datasheet(18/20 Pages) AD

Numer części	AD8236ARMZ-R71

Szczegółowy opis	40 關A Micropower Instrumentation Amplifier with Zero Crossover Distortion

PDF	20 Pages

Scroll/Zoom	100%

Producent	AD [Analog Devices]

Strona internetowa	http://www.analog.com

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18 / 20 page

AD8236

Rev. 0 | Page 18 of 20

APPLICATIONS INFORMATION

AC-COUPLED INSTRUMENTATION AMPLIFIER

An integrator can be tied to the AD8236 in feedback to create a

high-pass filter as shown in Figure 41. This circuit can be used

to reject dc voltages and offsets. At low frequencies, the impedance

of the capacitor, C, is high. Therefore, the gain of the integrator

is high. DC voltage at the output of the AD8236 is inverted and

gained by the integrator. The inverted signal is injected back into

the REF pin, nulling the output. In contrast, at high frequencies,

the integrator has low gain because the impedance of C is low.

Voltage changes at high frequencies are inverted but at a low

gain. The signal is injected into the REF pins, but it is not enough to

null the output. At very high frequencies, the capacitor appears as

a short. The op amp is at unity gain. High frequency signals are,

therefore, allowed to pass.

When a signal exceeds fHIGH-PASS, the AD8236 outputs the high-

pass filtered input signal.

AD8236

AD8603

+VS

+IN

–IN

0.1µF

10µF

REF

+VS

VREF

2πRC

fHIGH-PASS =

Figure 41. AC-Coupled Circuit

AD8236ARMZ-R71 Arkusz danych(PDF) 18 Page - Analog Devices