ICL7622ACPD datasheet(24/26 Pages) MAXIM

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Single/Dual/Triple/Quad

Operational Amplifiers

______________________________________________________________________________________

Figure 9. Low Droop Rate Sample and Hold—S2 improves

accuracy and acquisition time by including the voltage drop

across S1 inside the feedback loop. R1 closes the feedback

loop of A1 during the hold phase. The droop rate is [IBIAS(AZ)

+ ILEAK(S1) + ILEAK(S2)]/CHOLD.

ICL7622

IH5141

1⁄2

ICL7622

1⁄2

S/H

CONTROL

INPUT

VIN

VOUT

CHOLD

100kΩ

Figure 10. Long-Time Constant Integrator—With RIN = 1011Ω,

the time constant of this integrator is 100,000s. Since the input

voltage is converted to a current by RIN, the input voltage can

far exceed the power-supply range.

CINT

RIN

VIN

VOUT

1μF

Figure 11. Pico Ammeter—The response time of this curcuit is

RFB x CFB, where CFB is the stray capacitance between the

output and the inverting terminal of the amplifier.

Figure 12. 60Hz Twin “T“ Notch Filter—The low 1pA bias cur-

rent of the ICL7611 allows use of small 540pF and 270pF

capacitors, even with a notch frequency of 60Hz. The 60Hz

rejection is approximately 40dB.

CURRENT

SOURCE

CFB

RFB - 1011Ω

VO = 100mV/pA

OUTPUT

VIN

ICL7611

10MΩ

270pF

540pF

5MΩ

CINT

LONG TIME CONSTANT INTEGRATOR

(Detailed Circuit Diagram — Figure 10)

RIN

VOUT

VIN

Typical Operating Circuit

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