lt1568 Linear Technology Corporation, lt1568 Datasheet - Page 14

• Manufacturer Part Number: lt1568
• Description: Very Low Noise, High Frequency Active Rc, Filter Building Block
• Manufacturer: Linear Technology Corporation

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