LTC1068 Linear Technology, LTC1068 Datasheet - Page 18

• Manufacturer Part Number: LTC1068
• Description: Clock-Tunable/ Quad Second Order/ Filter Building Blocks
• Manufacturer: Linear Technology

LTC1068 Series
18
TYPICAL APPLICATIONS
V
5V
IN
14.3k
LTC1068-200 8th Order Linear Phase Lowpass, f
R11
R43 12.4k
R33 12.4k
R23 10k
R21 12.4k
R41 15.4k
23.2k
R31 10k
R
L3
0.1 F
for Ultralow Frequency Applications
10
11
12
13
14
1
2
3
4
5
6
7
8
9
INV B
HPB/NB
BPB
LPB
SB
NC
AGND
V
NC
SA
LPA
BPA
HPA/NA
INV A
+
FilterCAD Custom Inputs for f
LTC1068-200
2nd ORDER SECTION
R
23.2k
B3
R
L1
23.2k
HPD/ND
HPC/NC
INV C
INV D
BPD
BPC
LPC
CLK
LPD
NC
NC
SD
SC
V
D
U
B
C
A
–
28
27
26
25
24
23
22
21
20
19
18
17
16
15
R22 15.4k
R52 5.11k
R24 15.4k
R32 10k
R34 10k
R54 5.11k
1.7947
1.6002
1.7961
1.6070
f
O
CUTOFF
0.1 F
(Hz)
C
14.3k
R64 9.09k
= 1Hz
R
R62 9.09k
L2
= f
0.7347
0.5195
1.1369
0.5217
CLK
Q
1068 TA11a
/400
– 5V
400kHz
V
OUT
1.0159
Q
N
TYPE
LPBP
LP
LP
LP
– 80
– 90
–10
–20
–30
– 40
– 50
– 60
–70
10
0
0.1
MODE
1b
1b
3s
GROUP
DELAY
3
GAIN
Gain and Group Delay
vs Frequency
FREQUENCY (Hz)
1
1068 TA11b
10
1.0
0.9
0.8
0.7
0.2
0.1
0
0.6
0.5
0.4
0.3