3-263

TELCOM SEMICONDUCTOR, INC.

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AUTO-ZEROED OPERATIONAL AMPLIFIERS

FEATURES

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First Monolithic Chopper-Stabilized Amplifier

With On-Chip Nulling Capacitors

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Offset Voltage .................................................... 5

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Offset Voltage Drift .................................. 0.05

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Low Supply Current ...................................... 350

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High Common-Mode Rejection .................... 116dB

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Single Supply Operation ....................... 4.5V to 16V

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High Slew Rate ............................................. 2.5V/

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Wide Bandwidth ............................................ 1.5MHz

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High Open-Loop Voltage Gain

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Low Input Voltage Noise

(0.1 Hz to 1 Hz) .......................................... 0.65

P-P

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Pin Compatible With ICL7650

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Lower System Parts Count

GENERAL DESCRIPTION

The TC911 CMOS auto-zeroed operational amplifier is

the first complete monolithic chopper-stabilized amplifier.

Chopper operational amplifiers like the ICL7650/7652 and

LTC1052 require user-supplied, external offset compensa-

tion storage capacitors. External capacitors are not re-

quired with the TC911. Just as easy to use as the conven-

tional OP07 type amplifier, the TC911 significantly reduces

offset voltage errors. Pinout matches the OP07/741/7650

8-pin mini-DIP configuration.

Several system benefits arise by eliminating the exter-

nal chopper capacitors: lower system parts count, reduced

assembly time and cost, greater system reliability, reduced

PC board layout effort and greater board area utilization.

Space savings can be significant in multiple-amplifier de-

signs.

Electrical specifications include 15

µV maximum offset

voltage, 0.15

µV/°C maximum offset voltage temperature

coefficient. Offset voltage error is five times lower than the

premium OP07E bipolar device. The TC911 improves off-

set drift performance by eight times.

The TC911 operates from dual or single power sup-

plies. Supply current is typically 350

µA. Single 4.5V to 16V

supply operation is possible, making single 9V battery

operation possible. The TC911 is available in 2 package

types: 8-pin plastic DIP and SOIC.

PIN CONFIGURATION (SOIC and DIP)

+

–

+

–

VDD

VSS

TC911

–INPUT

+INPUT

A

2

3

47

B

*

*

A

B

6

MAIN

AMPLIFIER

LOW IMPEDANCE

OUTPUT BUFFER

INTERNAL

OSCILLATOR

(f

200 Hz)

OSC ≈

V

CORRECTION AMPLIFIER

OS

+

–

OUTPUT

1

2

3

4

8

7

6

5

OUTPUT

NC

+ INPUT

TC911ACPA

TC911BCPA

– INPUT

NC

NC

V

SS

V

SS

V

DD

V

DD

NC = NO INTERNAL CONNECTION

1

2

3

4

8

7

6

5

OUTPUT

NC

+ INPUT

TC911ACOA

TC911BCOA

– INPUT

NC

NC

ORDERING INFORMATION

Maximum

Temperature

Offset

Part No.

Package

Range

Voltage

TC911ACOA

8-Pin SOIC

0

°C to +70°C15µV

TC911ACPA

8-Pin

0

°C to +70°C15µV

Plastic DIP

TC911BCOA

8-Pin SOIC

0

°C to +70°C30µV

TC911BCPA

8-Pin

0

°C to +70°C30µV

Plastic DIP

FUNCTIONAL BLOCK DIAGRAM

TC911/A/B-7 9/11/96

TC911A

TC911B