Datasheet

LTC1068 Series
19
1068fc
TYPICAL APPLICATIONS
LTC1068-200 8th Order Linear Phase Lowpass, f
CUTOFF
= f
CLK
/400
for Ultralow Frequency Applications
FilterCAD Custom Inputs for f
C
= 1Hz
2nd ORDER SECTION f
0
(kHz) Q Q
N
TYPE MODE
B 1.7947 0.7347 LP 3
C 1.6002 0.5195 LP 1b
A 1.7961 1.1369 1.0159 LPBP 3s
D 1.6070 0.5217 LP 1b
Gain and Group Delay
vs Frequency
INV B
HPB/NB
BPB
LPB
SB
NC
AGND
V
+
NC
SA
LPA
BPA
HPA/NA
INV A
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
INV C
HPC/NC
BPC
LPC
SC
V
–
NC
CLK
NC
SD
LPD
BPD
HPD/ND
INV D
LTC1068-200
R
L1
23.2k
R
L2
14.3k
R21 12.4k
R22 15.4k
R32 10k
R52 5.11k
R34 10k
R24 15.4k
R54 5.11k
R64 9.09k
R62 9.09k
R31 10k
R11
14.3k
R41 15.4k
R23 10k
R33 12.4k
R43 12.4k
R
B3
23.2k
R
L3
23.2k
0.1µF
5V
–5V
400kHz
V
OUT
1068 TA09
0.1µF
V
IN
FREQUENCY (Hz)
0.1
–90
GAIN (dB)
GROUP DELAY (SEC)
–70
–50
–30
–10
1 10
1068 TA10
10
–80
–60
–40
–20
0
0
0.2
0.4
0.6
0.8
1.0
0.1
0.3
0.5
0.7
0.9
GAIN
GROUP
DELAY