lh0070 Linear Technology Corporation, lh0070 Datasheet - Page 9

• Manufacturer Part Number: lh0070
• Description: Precision 10v Reference
• Manufacturer: Linear Technology Corporation

APPLICATIO CIRCUITS
100k
R9
15V
U
10M
R8
IN
–15V
LT1031
357Ω
1/2W
R1**
253k
R3**
5k
GND
R7
392k
1%
R1
6
OUT
1
100pF
LM301A
28mA
R2*
5k
R
100
AT 0 C
S
+
†
–
8
†
28.5mA
3
2
Ultralinear Platinum Temperature Sensor*
OUT
LT1031
182k
GND
R10
1%
4.75k
1%
R4
–15V
Strain Gauge Conditioner
IN
5V
357Ω
1/2W
–5V
R5
200k
1%
R6
619k
1%
for 350Ω Bridge
20V
**
350Ω STRAIN
GUAGE BRIDGE**
*
†
**
THIS RESISTOR PROVIDES POSITIVE FEEDBACK TO THE BRIDGE TO ELIMINATE
LOADING EFFECT OF THE AMPLIFIER. EFFECTIVE Z
≥ 1MΩ. IF R2–R5 ARE CHANGED, SET R6 = R3
BRIDGE IS ULTRA LINEAR WHEN ALL LEGS ARE ACTIVE, TWO IN COMPRESSION
AND TWO IN TENSION, OR WHEN ONE SIDE IS ACTIVE WITH ONE COMPRESSED
AND ONE TENSIONED LEG
OFFSET AND DRIFT OF LM301A ARE VIRTUALLY ELIMINATED BY DIFERENTIAL
CONNECTION OF LT1012C
2
3
*
†
R11
6.65M
1%
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 NON-INTERACTIVE 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
–
+
20k
20k
R2
R4
LT1001
20V
–15V
R
654k
7
4
f
**
R5
2M
2MΩ*
3
2
R6
OUT
6
OUT
OUT
–
+
LT1012C
= 0.00385
= 0 AT 0 C
2MΩ
= 10V AT 100 C
= 5V AT 50 C
R3
R15
10k
R13
24.3k
R12
1k
R14
5k
6
V
–50 C T 150 C
OUT
V
OUT
= 100mV/ C
• 100
IN
OF AMPLIFIER STAGE IS
LT1031/LH0070
LT1031 • AC05
LT1031 • AC06
1031fb
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