Datasheet

LTC1068 Series
21
1068fc
TYPICAL APPLICATIONS
LTC1068-25 8th Order Lowpass, f
CUTOFF
= f
CLK
/32,
Attenuation –50dB at (1.25) (f
CUTOFF
) and –60dB at
(1.5)(f
CUTOFF
). Maximum f
CUTOFF
= 120kHz
FilterCAD Custom Inputs for f
C
= 100kHz
2nd ORDER SECTION f
0
(kHz) Q f
N
(kHz) TYPE MODE
B 70.9153 0.5540 127.2678 LPN 1bn
C 94.2154 2.3848 154.1187 LPN 1bn
A 101.4936 9.3564 230.5192 LPN 1bn
D 79.7030 0.9340 LP 1b
Gain vs Frequency
INV B
INV C
281
HPB/NB
HPC/NC
272
SB
NC
NC
SC
245
R21 10k
R22 10k
BPB BPC
263
R31 10k
R32 32.4k
LPA LPD
209
R63 8.45k
BPA BPD
1910
R33 118k
R34 15k
HPA/NA
HPD/ND
1811
INV A
INV D
17
16
15
12
13
14
R23 10k
R24 10k
LPB
LPC
25
4
R51
4.99k
R
H2
36.5k
R11 32.4k
V
IN
R64 3.16k
R62 5.9k
R
H1
18.2k
R
L1
26.7k
R
H3
53.6k
V
OUT
AGND
V
–
236
V
+
227
SA
SD
NC
NC
CLK
218
5V
–5V
3.2MHz
1068 TA13
LTC1068-25
0.1µF
0.1µF
R53
4.99k
R54
4.99k
R52
4.99k
R
L3
20.5K
R61
2.21k
R
L2
40.2k
FREQUENCY (kHz)
20
–80
GAIN (dB)
–70
–30
–10
100 500
1069 TA14
10
–40
–50
–60
–20
0