LT1124/LT1125
U
TYPICAL APPLICATION
Strain Gauge Signal Conditioner with Bridge Excitation
15V
5k
1k
3
THE LT1124/LT1125 IS CAPABLE OF PROVIDING EXCITATION CURRENT DIRECTLY
+
2.5V
TO BIAS THE 350Ω BRIDGE AT 5V WITH ONLY 5V ACROSS THE BRIDGE (AS OPPOSED
TO THE USUAL 10V) TOTAL POWER DISSIPATION AND BRIDGE WARM-UP DRIFT IS
REDUCED. THE BRIDGE OUTPUT SIGNAL IS HALVED, BUT THE LT1124/LT1125 CAN
AMPLIFY THE REDUCED SIGNAL ACCURATELY.
1
1/4
LT1125
–
LT1009
2
–15V
REFERENCE
OUTPUT
350Ω
BRIDGE
15V
5
6
4
+
–
7
1/4
LT1125
0V TO 10V
OUTPUT
301k*
10k
ZERO
TRIM
13
–15V
1µF
301k*
15V
1/4
13
12
–
50k
14
499Ω*
GAIN
TRIM
LT1125
+
1k
*RN60C FILM RESISTORS
1124/25 TA05
–15V
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1007
Single Low Noise, Precision Op Amp
Single Low Noise, Precision Op Amps
Dual/Quad Precision Picoamp Input
Dual Low Noise JFET Op Amp
Decompensated LT1124/LT1125
Dual Low Noise JFET Op Amp
Single LT1113
2.5nV/√Hz 1kHz Voltage Noise
0.85nV/√Hz Voltage Noise
LT1028/LT1128
LT1112/LT1114
LT1113
250pA Max I
B
4.5nV/√Hz Voltage Noise, 10fA/√Hz Current Noise
11V/µs Slew Rate
LT1126/LT1127
LT1169
6nV/√Hz Voltage Noise, 1fA/√Hz Current Noise, 10pA Max I
4.2nV/√Hz Voltage Noise, 10fA/√Hz Current Noise
6nV/√Hz Voltage Noise, 1fA/√Hz Current Noise, 10pA Max I
B
LT1792
LT1793
Single LT1169
B
11245fas, sn11245 LT/TP 0699 REV A 2K • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1992
16 LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
Linear [ Linear ]
