LT1632 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LT1632' PDF : 16 Pages View PDF
LT1632/LT1633
TYPICAL APPLICATION
Tunable Q Notch Filter
A single supply, tunable Q notch filter as shown in Figure
5 is built with LT1632 to maximize the output swing. The
filter has a gain of 2, and the notch frequency (fO) is set by
the values of R and C. The resistors R10 and R11 set up the
DC level at the output. The Q factor can be adjusted by
varying the value of R8. The higher value of R8 will
decrease Q as depicted in Figure 6, because the output
induces less of feedback to amplifier A2. The value of R7
should be equal or greater than R9 to prevent oscillation.
If R8 is a short and R9 is larger than R7, then the positive
feedback from the output will create phase inversion at the
output of amplifier A2, which will lead to oscillation.
C1
2.2µF
VIN
5V
R10
10k
R9
1k
C2
R11
4.7µF
10k
C
1000pF
R
1.62k
R1
500Ω R2
1k
–
A2
+1/2 LT1632
5V
R
1.62k
C
1000pF
+
A1
1/2 LT1632
–
R5
1k
R6
1k
C5
4.7µF
R8
5k
Figure 5. Tunable Q Notch Filter
VOUT
fO
=
1
2Ï€RC
R = 1.62k
C = 1000pF
R7
VO(DC)
=
5V R11
R11+ R10
=
2.5V
1k AV = 2
1632/33 F05
40
20
INCREASING R8
0
DECREASING R8
–20
–40
0 20 40 60 80 100 120 140 160 180 200
FREQUENCY (kHz)
13632/33 F06
Figure 6. Frequency Response
RELATED PARTS
PART NUMBER DESCRIPTON
LT1211/LT1212 Dual/Quad 14MHz, 7V/µs, Single Supply Precision Op Amps
LT1213/LT1214 Dual/Quad 28MHz, 12V/µs, Single Supply Precision Op Amps
LT1215/LT1216 Dual/Quad 23MHz, 50V/µs, Single Supply Precision Op Amps
LT1498/LT1499
LT1630/LT1631
Dual/Quad 10MHz, 6V/µs Rail-to-Rail Input and Output
C-LoadTM Op Amps
Dual/Quad 30MHz, 10V/µs Rail-to-Rail Input and Output Op Amps
C-Load is a trademark of Linear Technology Corporation.
COMMENTS
Input Common Mode Includes Ground, 275µV VOS(MAX),
6µV/°C Max Drift, Max Supply Current 1.8mA per Op Amp
Input Common Mode Includes Ground, 275µV VOS(MAX),
6µV/°C Max Drift, Max Supply Current 3.5mA per Op Amp
Input Common Mode Includes Ground, 450µV VOS(MAX),
6µV/°C Max Drift, Max Supply Current 6.6mA per Op Amp
High DC Accuracy, 475µV VOS(MAX), 4µV/°C Max Drift,
Max Supply Current 2.2mA per Amp
High DC Accuracy, 525µV VOS(MAX), 70mA Output Current,
Max Supply Current 4.4mA per Amp
16 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900q FAX:(408)434-0507 q www.linear-tech.com
16323f LT/TP 0998 4K • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 1998
Share Link: 
