Datasheet

LTC1068 Series
20
1068fc
TYPICAL APPLICATIONS
LTC1068-50 8th Order Linear Phase Lowpass, f
CUTOFF
= f
CLK
/50
for Single Supply Low Power Applications. Maximum f
CUTOFF
is
20kHz with a 3.3V Supply and 40kHz with a 5V Supply
FilterCAD Custom Inputs for f
C
= 10kHz
2nd ORDER SECTION f
0
(kHz) Q f
N
(kHz) Q
N
TYPE MODE
B 9.5241 0.5248 0.5248 AP 4a3
C 11.0472 1.1258 21.7724 LPN 2n
A 11.0441 1.3392 1.5781 LPBP 2s
D 6.9687 0.6082 LP 3
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
LTC1068-50
R
B1
13.3k
R
H2
34k
R
L2
9.09k
R
A1
56.2k
R21 20.5k
R22 43.2k
R32 43.2k
R42 196k
R34 14.3k
R44 34.8k
R24 16.9k
R31 10k
R11
22.6k
R41 22.6k
R23 10.7k
R33 12.7k
R43 48.7k
R
B3
24.9k
R
L3
26.7k
0.1µF
1µF
3.3V
500kHz
V
OUT
1068 TA11
V
IN
FREQUENCY (kHz)
1
GAIN (dB)
GROUP DELAY (µs)
–70
–50
–30
–10
10 100
1068 TA12
10
–80
–60
–40
–20
0
60
80
100
130
150
70
90
110
120
140
GAIN
GROUP
DELAY