12

LT1007/LT1037

sn100737 100737fbs

Infrared Detector Preamplifier

1007/37 TA08

IR RADIATION

OPTICAL

CHOPPER

–

+

LT1007

50mA

15V

6

4

7

3

2

OUTPUT TO

DEMODULATOR

SYNCHRONOUS

CHOPPED DETECTOR

OUTPUT

PHOTOCONDUCTIVE

INFRARED DETECTOR

HgCdTe type

INFRA-RED ASSOCIATES, INC.

100

µF

392k*

15V

–15V

+

+

100

µF

10

µF

+

392

Ω*

392

Ω*

267

Ω*

2N2219A

33

Ω

10

Ω

1k

+

100

µF

13

Ω AT 77°K

*1% METAL FILM

Precision Amplifier Drives 300

Ω Load to ±10V

1007/37 TA05

365

Ω

1%

20k

5%

10k

TRIM

LT1037

LT1007

2

INPUT

3

2

3

6

6

OUTPUT

±10V

15

Ω

5%

15

Ω

5%

300

Ω

340k

1%

THE ADDITION OF THE LT1007 DOUBLES THE AMPLIFIER’S OUTPUT DRIVE

TO

±33mA. GAIN ACCURACY IS 0.02%, SLIGHTLY DEGRADED COMPARED

TO ABOVE BECAUSE OF SELF-HEATING OF THE LT1037 UNDER LOAD.

Microvolt Comparator with Hysteresis

1007/37 TA04

OUTPUT

POSITIVE FEEDBACK TO ONE OF THE NULLING TERMINALS

CREATES APPROXIMATELY 5

µV OF HYSTERESIS.

OUTPUT CAN SINK 16mA.

INPUT OFFSET VOLTAGE IS TYPICALLY CHANGED LESS

THAN 5

µV DUE TO THE FEEDBACK.

7

8

6

4

2

3

INPUT

–15V

15V

–

+

LT1007

100M

5%

365

Ω

1%

15k

1%