Datasheet

LT1568
12
1568f
Table 1. Resistor Values in Ohms, Dual 2nd Order
Butterworth, Gain = 1, R12 = R11, R22 = R21, R32 = R31
f
CUTOFF
(MHz) R11 = R21 = R31
0.2 6340Ω
0.5 2550Ω
1 1270Ω
2 634Ω
3 422Ω
4 324Ω
5 255Ω
6 210Ω
7 182Ω
8 162Ω
9 143Ω
10 127Ω
FREQUENCY (MHz)
0.1
–50
GAIN (dB)
–40
–30
–20
–10
11020
1568 TA07
–60
–70
–80
–90
0
10
Amplitude Response
2nd Order Butterworth, f
CUTOFF
= 1MHz
Transient Response
2nd Order Butterworth, f
CUTOFF
= 1MHz
INPUT
500mV/DIV
OUTPUT
200mV/DIV
1µs/DIV
1568 TA08
Dual 2nd Order Lowpass Filter,
Dual Supply Operation
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
+
INVA
SA
OUTA
OUTA
GNDA
NC
V
–
V
+
INVB
SB
OUTB
OUTB
GNDB
EN
V
–
0.1µF
BAT54S
V
IN1
V
OUTA
V
OUTA
V
IN2
V
OUTB
V
OUTB
R11 R31
R22
R32 R12
R21
0.1µF
–5V
1568 TA03
5V
LT1568
Dual 2nd Order Lowpass Filter,
Single Supply Operation
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
+
INVA
SA
OUTA
OUTA
GNDA
NC
V
–
V
+
INVB
SB
OUTB
OUTB
GNDB
EN
V
–
0.1µF
V
IN1
V
OUTA
V
OUTA
V
IN2
V
OUTB
V
OUTB
R11 R31
R22
R32 R12
R21
0.1µF
1568 TA04
2.7V ≤ V
+
≤ 10V
LT1568
R
ff
C CUTOFF
11=R21= R31=R = 128 •
10MHz
f
C
Ω
=
DUAL 2nd ORDER LOWPASS FILTER DESIG S
U