LT1568 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LT1568' PDF : 16 Pages View PDF
LT1568
U
DUAL 2nd ORDER LOWPASS FILTER DESIG S
Dual 2nd Order Lowpass Filter,
Dual Supply Operation
Dual 2nd Order Lowpass Filter,
Single Supply Operation
5V
2.7V ≤ V+ ≤ 10V
0.1µF
R11 R31
VIN1
BAT54S
R21
VOUTA
VOUTA
0.1µF
1 V+
V+ 16
2
INVA
15
INVB
3
LT1568 14
SA
SB
4
13
OUTA OUTB
5
12
OUTA OUTB
6
11
GNDA GNDB
7
NC
10
EN
8 V–
V– 9
–5V
1568 TA03
R32 R12
VIN2
R22
VOUTB
VOUTB
0.1µF
R11
VIN1
VOUTA
VOUTA
R11 = R21 = R31 = R = 128Ω • 10MHz
fC = fCUTOFF
fC
1 V+
V+ 16
R31
2
15 R32
INVA INVB
3
LT1568 14
SA
SB
R21
4
13 R22
OUTA OUTB
5
12
OUTA OUTB
6
11
GNDA GNDB
0.1µF 7
NC
10
EN
8 V–
V– 9
1568 TA04
Table 1. Resistor Values in Ohms, Dual 2nd Order
Butterworth, Gain = 1, R12 = R11, R22 = R21, R32 = R31
fCUTOFF (MHz)
0.2
R11 = R21 = R31
6340Ω
0.5
2550Ω
1
1270Ω
2
634Ω
3
422Ω
4
324Ω
5
255Ω
6
210Ω
7
182Ω
8
162Ω
9
143Ω
10
127Ω
R12
VIN2
VOUTB
VOUTB
Amplitude Response
2nd Order Butterworth, fCUTOFF = 1MHz
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
0.1
1
FREQUENCY (MHz)
10 20
1568 TA07
12
Transient Response
2nd Order Butterworth, fCUTOFF = 1MHz
INPUT
500mV/DIV
OUTPUT
200mV/DIV
1µs/DIV
1568 TA08
1568f
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