LT1169CS8 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LT1169CS8 Datasheet PDF : 12 Pages
| |||
LT1169
TYPICAL APPLICATIONS N
10Hz Fourth Order Chebyshev Lowpass Filter (0.01dB Ripple)
R1
237k
VIN
C2
100nF
R2
237k
R3
15V C1
249k 2 –
8 33nF
R4
1 154k
1/2 LT1169
3+
4
R5
154k
R6
C3
249k 6 –
10nF
C4
330nF
1/2 LT1169
5+
7
VOUT
TYPICAL OFFSET ≈ 0.8mV
–15V
LT1169 • TA08
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
Paralleling Amplifiers to Reduce Voltage Noise
3+
A1
1 1.6k
1/2 LT1169
2–
91Ω
3k
10k
3+
A2
1 1.6k
15V
6– 8
1/2 LT1169
2–
91Ω
3k
7
1/2 LT1169
5+
4
OUTPUT
15V
–15V
5+ 8
An
7 1.6k
1/2 LT1169
6–
4
1. ASSUME VOLTAGE NOISE OF LT1169 AND 51 Ω SOURCE RESISTOR = 6.1nV/√Hz
91Ω
–15V
3k
2. GAIN WITH n LT1169s IN PARALLEL = n × 200
3. OUTPUT NOISE = √n × 200 × 6.1nV/√Hz
4. INPUT REFERRED NOISE =
OUTPUT NOISE
n × 200
=
6.1
√n
nV/√Hz
5. NOISE CURRENT AT INPUT INCREASES √n TIMES
6. IF n = 5, GAIN = 1000, BANDWIDTH = 110kHz, RMS NOISE, DC TO 1MHz =
2.1µV = 1.0µV
√5
LT1169 • TA06
RELATED PARTS
PART NUMBER
LT1113
LT1462
LT1464
DESCRIPTION
Lowest Noise Dual JFET Op Amp
Micro Power Dual JFET Op Amp
Low Power Dual JFET Op Amp
COMMENTS
4.5nV/√Hz Voltage Noise
3.0pA IB, 45µA ISUPPLY
3.0pA (Max) Input Bias Current
12 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417q (408)432-1900
FAX: (408) 434-0507qTELEX: 499-3977q www.linear-tech.com
1169fa LT/TP 0198 REV A 4K • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 1994
Share Link: 