12
LT1793
PART NUMBER DESCRIPTION COMMENTS
LT1113 Low Noise, Dual JFET Op Amp Dual Version of LT1792, V
NOISE
= 4.5nV/√Hz
LT1169 Low Noise, Dual JFET Op Amp Dual Version of LT1793, V
NOISE
= 6nV/√Hz, I
B
= 10pA
LT1467 Micropower Dual JFET Op Amp 1MHz, 2pA Max I
B
, 200µA Max I
S
LT1792 Low Noise, Single JFET Op Amp Lower V
NOISE
Version of LT1793, V
NOISE
= 4.2nV/√Hz
TYPICAL APPLICATIONS N
U
RELATED PARTS
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear-tech.com
LINEAR TECHNOLOGY CORPORATION 1999
1793f LT/TP 0599 4K • PRINTED IN USA
Accelerometer Amplifier with DC Servo
10Hz Fourth Order Chebyshev Lowpass Filter (0.01dB Ripple)
1793 TA04
V
OUT
TYPICAL OFFSET
≈
0.8mV
1% TOLERANCES
FOR V
IN
= 10V
P-P
, V
OUT
= –121dB AT f > 330Hz
= – 6dB AT f = 16.3Hz
LOWER RESISTOR VALUES WILL RESULT IN LOWER THERMAL NOISE AND LARGER CAPACITORS
R3
249k
C2
100nF
C1
33nF
R1
237k
V
IN
R2
237k
R6
249k
C4
330nF
3
2
–
+
LT1793
6
C3
10nF
R4
154k
R5
154k
7
6
15V
–15V
4
3
2
–
+
LT1793
7
5V TO 15V
–5V TO –15V
4
1793 TA03
OUTPUT
R1
100M
C1
1250pF
R3
2k
C3
2µF
R2
18k
C2
2µF
2
3
R4
20M
–
+
1/2 LT1464
1
R5
20M
ACCELEROMETER
B & K MODEL 4381
OR EQUIVALENT
(800) 442-1030
6
3
2
–
+
LT1793
R4C2 = R5C3 > R1 (1 + R2/R3) C1
OUTPUT = 0.8mV/pC* = 8.0mV/g**
DC OUTPUT ≤ 1.9mV
OUTPUT NOISE = 8nV/√Hz AT 1kHz
*PICOCOULOMBS
**
= EARTH’S GRAVITATIONAL CONSTANT