LT1568 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LT1568' PDF : 16 Pages View PDF
LT1568
U
4th ORDER LOWPASS FILTER DESIG S
4th Order Lowpass Filter,
Dual Supply Operation
5V
0.1µF
1 V+
V+ 16
VIN
R11
R31
2
INVA
15 R32
INVB
R12
BAT54S
3
LT1568 14
SA
SB
R21 4
13 R22
OUTA OUTB
5
12
OUTA OUTB
6
11
GNDA GNDB
7 NC
10
EN
8 V–
V– 9
0.1µF
–5V
1568 TA05
VOUT
VOUT
0.1µF
R11
VIN
4th Order Lowpass Filter,
Single Supply Operation
V+
1 V+
V+ 16
R31
2
15 R32 R12
INVA INVB
3
LT1568 14
SA
SB
R21
4
13 R22
OUTA OUTB
5
12
OUTA OUTB
6 GNDA
11
GNDB
VOUT
VOUT
0.1µF 7
NC
10
EN
8 V–
V– 9
1568 TA06
Table 4. Resistor Values in Ohms, 4th Order Lowpass
Butterworth, Gain = 1
fCUTOFF (MHz)
1
R11, R21
1.05k
R31
1.58k
R12, R22
1.82k
2
523Ω
787Ω
909Ω
3
348Ω
523Ω
590Ω
4
255Ω
383Ω
432Ω
5
205Ω
309Ω
348Ω
6
169Ω
255Ω
280Ω
7
143Ω
221Ω
232Ω
8
124Ω
196Ω
196Ω
9
107Ω
174Ω
169Ω
10
97.6Ω
158Ω
143Ω
R32
887Ω
432Ω
294Ω
215Ω
174Ω
143Ω
124Ω
107Ω
97.6Ω
88.7Ω
Amplitude Response
4th Order Lowpass Butterworth Lowpass, fCUTOFF = 1MHz
12
0
–12
–24
–36
–48
–60
–72
–84
–96
–108
0.1
1
FREQUENCY (MHz)
10 20
1568 TA13
14
Transient Response
4th Order Lowpass Butterworth Lowpass, fCUTOFF = 1MHz
INPUT
500mV/DIV
OUTPUT
200mV/DIV
1µs/DIV
1568 TA14
1568f
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