lt1012a Linear Technology Corporation, lt1012a Datasheet - Page 20

• Manufacturer Part Number: lt1012a
• Description: Picoamp Input Current, Microvolt Offset, Low Noise Op Amp
• Manufacturer: Linear Technology Corporation

LT1012A/LT1012
20
TYPICAL APPLICATIO
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] FAX: [phone]
100k
REFERENCE
LT1021-10
R2
10V
–15V
10M
392k*
235k*
5k*
U
Kelvin-Sensed Platinum Temperature Sensor Amplifier
ROSEMOUNT
EQUIVALENT
www.linear.com
5k
78S
OR
R
S
100
AT
0 C
182k
R1
4.75k
200k
619k
6.65M
2
3
* = WIRE WOUND RESISTORS
ALL OTHER RESISTORS ARE 1% METAL FILM
TRIM R2 AT 0 C FOR V
TRIM R3 AT 100 C FOR V
TRIM R4 AT 50 C FOR V
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
–
+
LT1012
–15V
20V
654k
R
7
4
F
*
6
0
0
= 0V
0
= 5V
= 10V
R3
1k
LINEAR TECHNOLOGY CORPORATION 1991
LW/TP 1202 1K REV B • PRINTED IN USA
V
– 50 C TO 150 C
OUT
24.3k
= 100mV/ C
LT1012A • TA04
R4
5k
10k
sn1012 1012afbs