15
LT1013/LT1014
TYPICAL APPLICATIONS
U
5V Powered, Linearized Platinum RTD Signal Conditioner
–
+
A4
1/4 LT1014
9
10
8
OUTPUT
0V–4V =
0°C–400°C
±0.05°C
GAIN TRIM
1k
3.01k
150Ω
–
+
A2
1/4 LT1014
2
3
1
–
+
A3
1/4 LT1014
6
5
7
2M
5k
LINEARITY
200k
200k
2M
50k
ZERO
TRIM
8.25k
274k
10k
–
+
A1
1/4 LT1014
13
12
14
+5V
4
11
250k
2.4k
5%
LT1009
2.5V
+5V
SENSOR
Q2
Q1
167Ω499Ω
1.5k
ROSEMOUNT
118MF
ALL RESISTORS ARE TRW-MAR-6 METAL FILM.
RATIO MATCH 2M–200K ± 0.01%.
TRIM SEQUENCE:
SET SENSOR TO 0 ° VALUE.
ADJUST ZERO FOR 0V OUT.
SET SENSOR TO 100 °C VALUE.
ADJUST GAIN FOR 1.000V OUT.
SET SENSOR TO 400 °C.
ADJUST LINEARITY FOR 4.000V OUT, REPEAT AS REQUIRED.
2N4250
(2)
Strain Gauge Bridge Signal Conditioner
–
+
1/2 LT1013
5
6
7
0.047
2k GAIN TRIM
46k*
100Ω*
OUTPUT 0V–3.5V
0psi–350psi
0.33
100k
10k
ZERO
TRIM
A
D
E
C
301k
V
REF
220
+5V
1.2V
OUT
REFERENCE
TO A/D CONVERTER
FOR RATIOMETRIC OPERATION
1mA MAXIMUM LOAD
–
+
2
3
1
39k
8
4
+5V
1/2 LT1013
0.1
8
5
2
4
+
100µF
+
100µF
PRESSURE
TRANSDUCER
350Ω
V ≈ –V
REF
LTC1044
1% FILM RESISTOR.
PRESSURE TRANSDUCER–BLH/DHF–350.
CIRCLED LETTER IS PIN NUMBER.
*
LT1004
1.2V
