Datasheet

LTC1068 Series
27
1068fc
Gain vs Frequency
TYPICAL APPLICATIONS
LTC1068-200 8th Order Highpass, f
CENTER
= f
CLK
/200,
Attenuation –60dB at (0.6)(f
CENTER
).
Maximum f
CUTOFF
= 20kHz with ±5V Supplies
FilterCAD Custom Inputs for f
C
= 1kHz
2nd ORDER SECTION f
0
(kHz) Q f
N
(kHz) TYPE MODE
B 0.9407 1.5964 0.4212 HPN 3a
C 1.0723 0.5156 0.2869 HPN 3a
A 0.9088 3.4293 0.5815 HPN 2b
D 0.9880 0.7001 0.0000 HP 3
Gain vs Frequency
INV B
INV C
281
HPB/NB
HPB/NC
272
SB
NC
NC
SC
245
R21 10k
R22 21.5k
BPB BPC
263
R31 16.5k
R41 11.3k
R32 10.2k
R42 18.7k
LPA LPD
209
BPA BPD
1910
R33 36.5k
R43 20.5k
R53
4.99k
R63 2.55k
R34 14.3k
R44 21k
HPA/NA
HPD
1811
INV A
INV D
17
16
15
12
13
14
R23 10k
R24 20.5k
LPB
LPC
25
4
R
H2
20.5k
R11 18.2k
V
IN
R
H1
11.8k
R
L1
66.5k
R
H3
10k
C23 [1/(2π • R23 • C23) = (160)(f
CUTOFF
)]
V
OUT
AGND
V
–
236
V
+
22
7
SA
SD
NC
NC
CLK
21
8
5V
200kHz
–5V
1068 TA25
LTC1068-200
0.1µF
0.1µF
R
L2
249k
FREQUENCY (kHz)
0.2
–40
–50
–60
–70
–80
GAIN (dB)
–30
–20
–10
0
1 10
1068 TA26
10