LT1677 LINER [Linear Technology], LT1677 Datasheet - Page 16

• Manufacturer Part Number: LT1677
• Description: Low Noise, Rail-to-Rail Precision Op Amp
• Manufacturer: LINER [Linear Technology]

TYPICAL APPLICATIO
LT1677
This 2-wire remote Geophone preamp operates on a
current-loop principle and so has good noise immunity.
Quiescent current is 10mA for a V
will cause AC currents about this point of ~ 4mA for a
V
16
RELATED PARTS
PART NUMBER
LT1028
LT1115
LT1124/LT1125
LT1126/LT1127
LT1498/LT1499
LT1792
LT1793
LT1884
C-Load is a trademark of Linear Technology Corporation.
OUT
TECHNOLOGY
LT1431CZ
of ~ 1V max. The op amp is configured for a voltage
LM334Z
LINEAR
6mA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] FAX: [phone] www.linear-tech.com
3V
C
A
A
V
V
V
R
+
–
R
=
DESCRIPTION
Ultralow Noise Precision Op Amp
Ultralow Noise, Low distortion Audio Op Amp
Dual/Quad Low Noise, High Speed Precision Op Amps
Dual/Quad Decompensated Low Noise, High Speed Precision Op Amps
10MHz, 5V/ s, Dual/Quad Rail-to-Rail Input and Output Op Amps
Low Noise, Precision JFET Input Op Amp
Low Noise, Picoampere Bias Current Op Amp
Dual Rail-to-Rail Output Picoamp Input Precision Op Amp
R2 + R3
R1 + R
R8
11
R6
4.99k
R7
24.9k
||
L
R4
+
107
C3
220 F
GEOSOURCE
GEOPHONE
R
L
U
MD-105
= 847
OUT
of 2.5V. Excitation
–
+
2-Wire Remote Geophone Preamp
R4
14k
150
R3
16.2k
R1
2
3
–
+
LT1677
7
4
gain of ~107. Components R5 and Q1 convert the voltage
into a current for transmission back to R10, which con-
verts it into a voltage again. The LM334 and 2N3904 are
not temperature compensated so the DC output contains
temperature information.
6
0.1 F
100k
R2
C2
1000pF
Q1
2N3904
R5
243
C4
Similar to LT1007
COMMENTS
Lowest Noise 0.85nV/ Hz
0.002% THD, Max Noise 1.2nV/ Hz
Similar to LT1037
Precision C-Load
4.2nV/ Hz, 10fA/ Hz
6nV/ Hz, 1fA/ Hz
2.2MHz Bandwidth, 1.2V/ s SR
20
R9
1677 TA03
LINEAR TECHNOLOGY CORPORATION 2000
TM
1677i LT/TP 0200 4K • PRINTED IN USA
Stable
12V
R10
250
V
2.5V
OUT
1V