AMS385-1.2AS datasheet(4/8 Pages) ADMOS

4 / 8 page

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140

AMS285-1.2/AMS385-1.2

TYPICAL APPLICATIONS (Continued)

°°C - 100°°C Thermometer

Lower Power Thermometer

°°C - 100°°C Thermometer

AMS385-1.2

150

100

220

1.5V

(1.3-1.6V)†

V-

V+

LM334

0-100

µA

OUT

Calibration

1. Short AMS385-1.2, adjust R3 for IOUT = temp at

µA/°K

2. Remove short, adjust R2 for correct reading in

°C

† I

Q at 1.3V

≅ 500 µA

IQ at 1.6V

≅ 2.4mA

LM334

AMS385-1.2

1.3 TO

1.6V‡

8k TO

12k†

* 2N3638 or 2N2907 select for inverse HFE

≅ 5

† Select for operation at 1.3V

‡ I

≅ 600µA to 900 µA

AMS385-1.2

150

100

1.3-1.6V

V-

V+

LM334

0-50

µA

OUT

Calibration

1. Short AMS385-1.2, adjust R3 for IOUT = temp at

1.8

µA/°K

2. Remove short, adjust R2 for correct reading in

°F

Centigrade Thermometer

Micropower* 10V Reference

AMS385-1.2

V+

V-

LM334

90k

25k

27k

1.2k

2.3k

OUTPUT

1mV/° C

2.2k

1.5V†

Calibration

1. Adjust R1 so that V1 = temp at 1mV/

°K.

2. Adjust V2 to 273.2mV.

† I

Q for 1.3V to 1.6V battery voltage = 50

µA to 150µA

150pF

AMS385-1.2

3.5M

500k

22M

IN = 15V

10V

LM4250C

*IQ

≅ 20µA standby current

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