TC911A

TC911B

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

© 2001 Microchip Technology Inc.

DS21481A

Monolithic Auto-Zeroed Operational Amplifers

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

s

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

(0.1Hz to 1Hz) ............................................ 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 ampli-

fier. Chopper operational amplifiers like the ICL7650/7652

and LTC1052 require user-supplied, external offset com-

pensation storage capacitors. External capacitors are

not required with the TC911. Just as easy to use as the

conventional 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