LTC1062
TYPICAL APPLICATIO S
Cascading Two LTC1062s to Form a Very
Selective Clock Sweepable Bandpass Filter
R1
10k
V
IN
R2
10k 1
2
R′1
10k
R′2
12.5k 1
2
R1
V
IN
FB
AGND
V
–
B
OUT
OUT
V
+
2
7
LTC1062
–5V
3
4
6
5
5V
f
CLK
1062 TA08
DIVIDER C
OSC
RATIO
Frequency Response of the Bandpass Filter
20
10
0
–10
–20
(dB)
–30
–40
–50
–60
–70
–80
–90
0.5
1
1.5
2
2.5
(kHz)
3
3.5
4
4.5
V
S
=
±5V
R1 = 1
R2
R′1 = 0.8
R′2
V
IN
= 100mV
RMS
(dB)
Frequency Response of the Notch Filter
–10
0
10
20
30
40
50
60
70
100
300
500
(Hz)
700
900
1100
1062 TA10
1062 TA09
+
–
U
FB
AGND
–
B
OUT
OUT
+
8
7
FB
AGND
–
B
OUT
OUT
V
+
8
7
V
OUT
LTC1062
–5V
3
4
V
V
6
5
5V
–5V
3
4
V
LTC1062
6
5
5V
DIVIDER C
OSC
RATIO
DIVIDER C
OSC
RATIO
f
CLK
1062 TA07
Clock Tunable Notch Filter
For Simplicity Use R3 = R4 = R5 = 10k;
R5 = 1.234, f
CLK
= 79.3
f
NOTCH
R2
1
R4
R5
R2 1
8
R3
V
OUT
1062fd
9
LINER [ LINEAR TECHNOLOGY ]
