Datasheet
9
LTC1062
1062fd
Cascading Two LTC1062s to Form a Very
Selective Clock Sweepable Bandpass Filter
FB
AGND
V
–
DIVIDER
RATIO
B
OUT
OUT
V
+
C
OSC
1
2
3
4
8
7
6
5
LTC1062
1062 TA07
V
IN
R1
10k
f
CLK
V
OUT
5V
–5V 5V
FB
AGND
V
–
DIVIDER
RATIO
B
OUT
OUT
V
+
C
OSC
1
2
3
4
8
7
6
5
LTC1062
–5V
R2
10k
R′1
10k
R′2
12.5k
FB
AGND
V
–
DIVIDER
RATIO
B
OUT
OUT
V
+
C
OSC
1
2
3
4
8
7
6
5
LTC1062
1062 TA08
V
IN
R1
–5V
f
CLK
V
OUT
5V
R2 R3
Clock Tunable Notch Filter
For Simplicity Use R3 = R4 = R5 = 10k;
–
+
R5R4
R5
R2
= 1.234, =
79.3
1
f
CLK
f
NOTCH
Frequency Response of the Bandpass Filter
(kHz)
0.5
(dB)
–80
–60
–40
–20
1
1.5 2 2.5
1062 TA09
3 3.5 4 4.5
0
–90
–70
–50
–30
10
20
–10
V
S
= ±5V
V
IN
= 100mV
RMS
= 1
R1
R2
= 0.8
R′1
R′2
Frequency Response of the Notch Filter
(Hz)
100
(dB)
–10
0
10
20
30
40
50
60
70
900
1062 TA10
300 500 700 1100
TYPICAL APPLICATIO S
U