12
LT1793
PART NUMBER
DESCRIPTION
COMMENTS
LT1113
Low Noise, Dual JFET Op Amp
Dual Version of LT1792, VNOISE = 4.5nV/√Hz
LT1169
Low Noise, Dual JFET Op Amp
Dual Version of LT1793, VNOISE = 6nV/√Hz, IB = 10pA
LT1467
Micropower Dual JFET Op Amp
1MHz, 2pA Max IB, 200A Max IS
LT1792
Low Noise, Single JFET Op Amp
Lower VNOISE Version of LT1793, VNOISE = 4.2nV/√Hz
TYPICAL APPLICATIONS N
U
RELATED PARTS
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX:(408)434-0507 q 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
VOUT
TYPICAL OFFSET
≈ 0.8mV
1% TOLERANCES
FOR VIN = 10VP-P, VOUT = –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
VIN
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
2
F
R2
18k
C2
2
F
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
**g = EARTH’S GRAVITATIONAL CONSTANT