Advanced Monolithic Systems, Inc.

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AMSOP-77

TYPICAL APPLICATIONS

Precision High-Gain Differential Amplifier

TYPE

AMOUNT

COMMON-MODE VOLTAGE

0.01%/V

GAIN LINEARITY, WORST CASE

0.02%

0.008%/

°C

0.008%/

°C

Bilateral Current Source

Basic Current Source

100mA current Source

These current sources will supply both positive and negative current into a grounded

load.

Note that

R1

R3

R2

R4

R5

1

R2

R4

R5

−

+

⎟

⎠

⎞

⎜

⎝

⎛

+

=

R1

R3

must

R2

R4

R5

=

+

.

OP-77E

+

-

R2

1k

Ω

0.1

µF

-15V

+15V

1k

Ω

R4

1M

Ω

4

6

7

2

3

0.1

µF

1M

Ω

R3

R1

make it possible to obtain performance not previously available in

single stage very high-gain amplifier applications.

For the best CMR,

R4

R3

equal

must

R2

1

R

. In this example, with a

10mV differential signal, the maximum errors are as listed.

OP-77

+

-

1k

Ω

100k

Ω

I

100k

Ω

990

Ω

6

2

3

R4

R5

10

Ω

R3

R1

R2

V

IN

OP-77

+

-

I

6

2

3

R4

R5

R3

R1

R2

V

IN

50

Ω

-15V

2N2907

2N2222

+15V

R5

*

R1

R3

V

I

IN

OUT

=

GIVEN R3= R4+R5, R1=R2