TC901

TC901- 7 9/5/96

© 2001 Microchip Technology Inc.

DS21480A

GENERAL DESCRIPTION

The TC901 is a monolithic, auto-zeroed operational

amplifier. It is a second-generation design of the TC91X

CMOS chopper-stabilized op-amps with on-chip capacitors.

Elimination of the external capacitors allows the de-

signer to increase reliability, lower cost, and simplify design

by lowering parts count.

Since the TC901 is an auto-zeroing op amp, input offset

voltage is very low. More important, there is almost zero drift

with time. This eliminates production line adjustments, as

well as periodic calibration.

Notable electrical characteristics are low supply cur-

rent (450

µA, typical), single-supply operation (5V to 32V),

low input offset voltage (7

typical, for a 10Hz bandwidth), and fast recovery from

saturation without the use of external clamp circuitry.

This device is supplied in 8-pin plastic DIP and plastic

SOIC packages. It is pin compatible with bipolar, CMOS,

JFET and other chopper-stabilized op-amps using the in-

dustry-standard 741 pinout.

FEATURES

s Second-Generation Monolithic,

Chopper-Stabilized Op Amp

s No External Capacitors Required

s Single-Supply Operation ...........

s Supply Current............................ 450

s Input Offset Voltage ................................... 7

s Common-Mode Rejection Ratio ............ 140dB, Typ

s Open-Loop Gain ............ 140dB Into 10k Load, Typ

s Input Noise ......................... 5

s Pinout Compatible With ICL7650

s Lowest Parts Count Chopper Op Amp

PIN CONFIGURATION (DIP and SOIC)

1

2

3

4

8

7

6

5

OUTPUT

NC

+INPUT

TC901CPA

–INPUT

NC

NC

VDD

VDD

VSS

VSS

NC = NO INTERNAL CONNECTION

1

2

3

4

8

7

6

5

OUTPUT

NC

+INPUT

TC901COA

–INPUT

NC

NC

–

+

–

+

FUNCTIONAL BLOCK DIAGRAM

+

–

+

–

VDD

VSS

TC901

–INPUT

+INPUT

A

2

3

47

B

*

*

A

B

6

NOTE: Internal capacitors. No external capacitors required.

MAIN

AMPLIFIER

LOW IMPEDANCE

OUTPUT BUFFER

INTERNAL

OSCILLATOR

(f

200 Hz)

OSC ≈

V

CORRECTION AMPLIFIER

OS

+

–

OUTPUT

ORDERING INFORMATION

Temperature

Part No.

Package

Range

TC901COA

8-Pin SOIC

0

°C to +70°C

TC901CPA

8-Pin Plastic DIP

0

°C to +70°C

Dual Auto-Zeroed Operational Amplifiers