Datasheet

LTC1068 Series
26
1068fc
TYPICAL APPLICATIONS
LTC1068-25 8th Order Order Bandpass, f
CENTER
= f
CLK
/32,
Passband –3dB at (0.965)(f
CENTER
) and (1.35)(f
CENTER
).
Maximum f
CENTER
= 80kHz with ±5V Supplies
FilterCAD Custom Inputs for f
C
= 10kHz
2nd ORDER SECTION f
0
(kHz) Q TYPE MODE
B 10.2398 15.6469 BP 1b
C 10.3699 21.1060 BP 1b
A 9.6241 18.6841 LP 1b
D 9.7744 15.6092 LP 1b
Gain vs Frequency
INV B
INV C
281
HPB/NB
HPC/NC
272
SB
NC
NC
SC
245
R21 4.99k
R22 4.99k
BPB BPC
263
R31 97.6k
R32 130k
LPA LPD
209
R63 6.49k
BPA BPD
1910
R33 124k
R34 102k
HPA/NA
HPD/ND
1811
INV A
INV D
17
16
15
12
13
14
R23 4.99k
R24 4.99k
LPB
LPC
25
4
R51
4.99k
R11 121k
V
IN
R64 6.98k
R62 9.53k
R
H1
118k
V
OUT
AGND
V
–
236
V
+
227
SA
SD
NC
NC
CLK
218
5V
–5V
320kHz
1068 TA23
LTC1068-25
0.1µF
0.1µF
R53
4.99k
R54
4.99k
R52
4.99k
R
L3
78.7K
R61
8.87k
R
B2
47.5k
FREQUENCY (kHz)
7.5
GAIN (dB)
10
0
–10
–20
–30
–40
–50
–60
–70
11.5
1068 TA24
8.5 9.5 10.5 12.5118 9 10 12