LT1012A_15 Datasheet, PDF (20/20 Pages) Linear Technology – Picoamp Input Current, Microvolt Offset, Low Noise Op Amp

LT1012A/LT1012
TYPICAL APPLICATIO
10V
REFERENCE
LT1021-10
R2
10M
100k
392k*
–15V
Kelvin-Sensed Platinum Temperature Sensor Amplifier
5k
235k*
5k*
ROSEMOUNT
78S
OR ^RS
EQUIVALENT
100Ω
AT
0°C
R1
182k
4.75k
6.65M ^RF*
654k
20V
2_– 7
200k
6
LT1012
3₊
4
R4
5k
10k
R3
1k
24.3k
V_OUT = 100mV/°C
– 50°C TO 150°C
–15V
619k
* = WIRE WOUND RESISTORS
ALL OTHER RESISTORS ARE 1% METAL FILM
TRIM R2 AT 0°C FOR V₀ = 0V
TRIM R3 AT 100°C FOR V₀ = 10V
TRIM R4 AT 50°C FOR V₀ = 5V
IN THE ORDER INDICATED
POSITIVE FEEDBACK (R1) LINEARIZES THE
INHERENT PARABOLIC NONLINEARITY OF
THE PLATINUM SENSOR AND REDUCES
ERRORS FROM 1.2°C TO 0.004°C OVER
THE – 50°C TO 150°C RANGE
LT1012A • TA04
20 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^q FAX: [phone] ^q www.linear.com
sn1012 1012afbs
LW/TP 1202 1K REV B • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 1991