LT1021 Datasheet, PDF (14/16 Pages) Linear Technology – Precision Reference

LT1021
TYPICAL APPLICATIONS
Ultralinear Platinum Temperature Sensor*
LT1021-10
OUT
IN 20V
R2*
5k
R10
182k
1%
R1**
253k
R8
R9
10M
100k
GND
R11
6.65M
1%
R_F**
654k
R14
5k
R15
10k
R12
1k
R3**
5k
R7
392k
1%
–15V
R_S^†
100Ω AT
0°C
R4
4.75k
1%
20V
R5
2_–
7
200k
1%
LT1001
3₊
4
R13
24.3k
6
V_OUT =100mV/°C
– 50°C ≤ T ≤ 150°C
R6
–15V
619k ^†_{STANDARD INDUSTRIAL 100Ω PLATINUM 4-WIRE SENSOR,}
1% _{ROSEMOUNT 78S OR EQUIVALENT. α = 0.00385}
TRIM R9 FOR V_OUT = 0V AT 0°C
TRIM R12 FOR V_OUT = 10V AT 100°C
TRIM R14 FOR V_OUT = 5V AT 50°C
USE TRIM SEQUENCE AS SHOWN. TRIMS ARE NONINTERACTIVE
SO THAT ONLY ONE TRIM SEQUENCE IS NORMALLY REQUIRED.
*_{FEEDBACK LINEARIZES OUTPUT TO ±0.005°C FROM}
– 50°C TO 150°C
**_{WIREWOUND RESISTORS WITH LOW TC}
1021 TA10
U
W
EQUIVALE T SCHE ATIC
INPUT
14
Q3
D1
D2
D3
OUTPUT
R1
Q1
–+
A1
D4
6.3V
R2
Q2
GND
LT1021 ES