LT1021 LINER [Linear Technology], LT1021 Datasheet - Page 14

• Manufacturer Part Number: LT1021
• Description: Precision Reference
• Manufacturer: LINER [Linear Technology]

LT1021
14
EQUIVALE T SCHE ATIC
TYPICAL APPLICATIONS
100k
R9
U
10M
R8
–15V
W
R3**
5k
R1**
253k
R7
392k
1%
U
R2*
5k
R
100 AT
0 C
S
†
Ultralinear Platinum Temperature Sensor*
D4
6.3V
–
182k
R10
1%
4.75k
A1
1%
R4
+
R5
200k
1%
R6
619k
1%
Q1
OUT
INPUT
LT1021-10
GND
**
†
*
STANDARD INDUSTRIAL 100 PLATINUM 4-WIRE SENSOR,
ROSEMOUNT 78S OR EQUIVALENT.
TRIM R9 FOR V
TRIM R12 FOR V
TRIM R14 FOR V
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
2
3
R11
6.65M
1%
Q2
–
+
IN
LT1001
D1
D2
–15V
20V
654k
R
20V
D3
7
4
F
**
OUT
OUT
OUT
Q3
R1
R2
= 0V AT 0 C
LT1021 ES
6
= 10V AT 100 C
= 5V AT 50 C
GND
OUTPUT
R15
10k
R13
24.3k
R12
1k
R14
5k
V
– 50 C T 150 C
= 0.00385
OUT
=100mV/ C
1021 TA10