3-273

TELCOM SEMICONDUCTOR, INC.

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CHOPPER-STABILIZED OPERATIONAL AMPLIFIER

TC7650

GENERAL DESCRIPTION

The TC7650 CMOS chopper-stabilized operational

amplifier practically removes offset voltage error terms

from system error calculations. The 5

specification, for example, represents a 15 times improve-

ment over the industry-standard OP07E. The 50nV/

°C off-

set drift specification is over 25 times lower than the OP07E.

dures, periodic potentiometer adjustment and the reliability

problems caused by damaged trimmers.

The TC7650 performance advantages are achieved

without the additional manufacturing complexity and cost

user-supplied external capacitors. The capacitors connect

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.

PIN CONFIGURATIONS

FEATURES

s Low Input Offset Voltage ......................... 0.7

s Low Input Offset Voltage Drift ......... 0.05

s Low Input Bias Current ............................ 10pA Max

Ω

s High Open-Loop Voltage Gain ................ 120dB Min

s Low Input Noise Voltage ............................ 2.0

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

s Low-Power Operation ..................................... 20mW

s Output Clamp Speeds Recovery Time

s Compensated Internally for Stable Unity Gain

Operation

s Direct Replacement for ICL7650

s Available in 8-Pin Dip and 14-Pin Dip

FUNCTIONAL BLOCK DIAGRAM

ORDERING INFORMATION

Temperature

Max

Part No.

Package

Range

TC7650CPA

8-Pin Plastic DIP

0

°C to +70°C5µV

TC7650CPD

14-Pin Plastic DIP

0

°C to +70°C5µV

TC7650

NULL

NULL

INPUTS

OUTPUT

CLAMP

OUTPUT

B

B

A

CEXT

CEXT

FOR 8-PIN DIP, CONNECT TO VSS.

NULL

AMPLIFIER

MAIN

AMPLIFIER

OUTPUT CLAMP

CIRCUIT

INTERMOD

COMPENSATION

OSCILLATOR

AB

INT/EXT

EXT CLK IN

CLK OUT

14-PIN DIP ONLY

BA

CRET

*

*

TC7650-5 9/11/96

1

2

3

4

5

6

7

14

13

12

11

10

9

8

C

NC

(GUARD)

8-Pin DIP

V

SS

V

SS

INT/EXT

EXT CLK

INPUT

INT CLK

OUTPUT

OUTPUT

OUTPUT

CLAMP

RETN

B

C

A

C

TC7650CPD

1

2

3

4

8

7

6

5

C

OUTPUT

A

V

DD

TC7650CPA

INPUT

INPUT

C

B

(+)

(–)

CLAMP

INPUT

(–)

INPUT

(+)

NC

(GUARD)

14-Pin DIP

NC = NO INTERNAL CONNECTION