ltc1065csw-trpbf Linear Technology Corporation, ltc1065csw-trpbf Datasheet - Page 11

• Manufacturer Part Number: ltc1065csw-trpbf
• Description: Dc Accurate, Clock-tunable Linear Phase 5th Order Bessel Lowpass Filter
• Manufacturer: Linear Technology Corporation

A
Table 4. Aliasing Data
INPUT FREQUENCY
PPLICATI
0.9995 f
0.995 f
0.99
0.9875 f
0.985 f
0.9825 f
0.98
0.975 f
0.97
0.965 f
0.96
0.955 f
0.95
0.94
0.93
0.9
f
f
f
f
f
f
f
f
CLK
CLK
CLK
CLK
CLK
CLK
CLK
CLK
CLK
CLK
CLK
CLK
CLK
CLK
CLK
CLK
O
OUTPUT FREQUENCY
U
S
0.0005 f
0.005 f
0.01
0.0125 f
0.015 f
0.0175 f
0.02
0.025 f
0.03
0.035 f
0.04
0.045 f
0.05
0.06
0.07
0.1
I FOR ATIO
U
f
f
f
f
f
f
f
f
CLK
CLK
CLK
CLK
CLK
CLK
CLK
CLK
CLK
CLK
CLK
CLK
CLK
CLK
CLK
CLK
W
OUTPUT AMPLITUDE
REFERENCED TO
INPUT SIGNAL
– 10.43 dB
– 14.14 dB
– 21.84 dB
– 28.98 dB
– 35.31 dB
– 40.94 dB
– 45.96 dB
– 50.46 dB
– 58.29 dB
– 64.90 dB
– 80.20 dB
– 7.21 dB
– 3.13 dB
– 0.01 dB
– 0.98 dB
– 4.79 dB
U
An input RC can be used to attenuate incoming signals
close to the filter clock frequency (Figure 10). A Bessel
passband response will be maintained if the value of the
input resistor follows Table 1.
V
IN
V
Figure 10. Adding an Input Anti-Aliasing RC
–
R
C
0.1µF
1
2
3
4
f
20
CLK
≤
LTC1065
2πRC
1
≤
f
CLK
10
8
7
6
5
f
V
CLK
OUT
LTC1065
1065 F10
0.1µF
V
11
+
1065fb