TC7650CPA(2002) 查看數據表（PDF） - Microchip Technology

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TC7650CPA
(Rev.:2002)

Chopper Stabilized Operational Amplifie

Microchip Technology 

TC7650

General Description

The TC7650 CMOS chopper stabilized operational

amplifier practically removes offset voltage error terms

from system error calculations. The 5µV maximum VOS

specification, for example, represents a 15 times

improvement over the industry standard OP07E. The

50nV/°C offset drift specification is over 25 times lower

than the OP07E. The increased performance elimi-

nates VOS trim procedures, periodic potentiometer

adjustment and the reliability problems caused by dam-

aged trimmers.

The TC7650 performance advantages are achieved

without the additional manufacturing complexity and

cost incurred with laser or "zener zap" VOS trim tech-

niques.

Functional Block Diagram

Output

Clamp

Inputs

Output Clamp

Circuit

Main

Amplifier

NULL

B

A

Intermod

Compensation

B

Null

Amplifier

Null

* For 8-Pin DIP, connect to Vss

The TC7650 nulling scheme corrects both DC VOS

errors and VOS drift errors with temperature. A nulling

amplifier alternately corrects its own VOS errors and the

main amplifier VOS error. Offset nulling voltages are

stored on two user supplied external capacitors. The

capacitors connect to the internal amplifier VOS null

points. The main amplifier input signal is never

switched. Switching spikes are not present at the

TC7650 output.

The 14-pin dual-in-line package (DIP) has an external

oscillator input to drive the nulling circuitry for optimum

noise performance. Both the 8 and 14-pin DIPs have

an output voltage clamp circuit to minimize overload

recovery time.

Oscillator

A

B

14-Pin DIP Only

INT/EXT

EXT CLK IN

CLK OUT

Output

CB

B

A

CA

TC7650

*CRETN

DS21463B-page 2

© 2002 Microchip Technology Inc.

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