Datasheet

9
LTC1264
1264fb
ODES OF OPERATIO
W
U
Figure 9. Mode 2n, 2nd Order Filter Providing a Lowpass Notch Output
–
+
Σ
∫ ∫
AGND
R1
HP
BP
LP
V
IN
1264 G09
+
–
S
R2
R3
R4
C
C
–
+
EXTERNAL OP AMP OR
INPUT OP AMP OF THE
LTC1264, SIDES A, B, C, D
LOWPASS
NOTCH
OUTPUT
R
G
R
L
R
H
f
i
= ; f
n
= f
i
f
O
= f
i
H
OLPn
(f = 0)= +
f
CLK
20
√
R
H
R
L
1 +
R2
R1
R
G
R
L
R
G
R
H
()
1
R2
R4
1 +
( )
( )
√
R2
R4
1 +
Q = 1.005
R3
6.42•R4
( )
1
1 –
R3
R2
( )
√
R2
R4
1 +
1/4 LTC1264
W
IDAGRA
B
L
O
C
K
–
+
+
∫
+
∫
+
∫
+
∫
+
∫
+
∫
CLK
HPC/NC
BPC
LPC
HPB/NB
BPB
LPB
BPA
LPA
INV A
AGND
INV C
1264 BD
HPA/NA
+
Σ
SA
–
+
–
+
–
+
–
+
INV D
INV B
HPD/ND
Σ
–
SB
Σ
–
SC
Σ
–
SD
+
+
+
∫
BPD
+
∫
LPD
V
+
V
–
12
6
1
24
13
17
15 16
20
14
23
5
22 21
3
8
2
11 10 9 7
18
19
4