LTC1066-1
20
10661fa
FREQUENCY (Hz)
10k
GAIN (dB)
100k 1M 10M
1066-1 TA08b
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
1066-1 TA08a
8V
–8V
OUTPUT CLOCK
FEEDTHROUGH
FILTER
8V
2ND ORDER BUTTERWORTH INPUT
ANTI-ALIASING FILTER PROVIDES
–68dB ATTENUATION TO INPUTS AT 2f
CLK
.
f
–3dB
= 200kHz
–8V
V
OUT
V
IN
f
CLK
C1
51pF
C2
510pF
20pF
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
OUT A
–IN A
+IN A
V
–
V
+
CONNECT 1
FILTER
OUT
50/100
CLK
V
+
OUT B
+IN B
GND
FILTER
IN
COMP 2
CONNECT 2
COMP 1
V
–
0.1µF
0.1µF
0.1µF
LTC1066-1
100Ω
30k
2.49k
2.49k
10k
0.1µF
1000pF
f
–3dB
= 2•f
CUTOFF
f
CUTOFF
=
C1 =
C2 = µF (f
–3dB
IN Hz)
f
CLK
50
C2
10
100
f
–3dB
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 1994
LT/LT 0905 REV A • PRINTED IN USA
TYPICAL APPLICATIONS
U
100kHz Elliptic Lowpass Filter with Input Anti-Aliasing and Output Clock Feedthrough Filters
(Not DC Accurate)
Gain vs Frequency
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
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LTC1566-1 Low Noise, 2.3MHz Lowpass Filter Continuous Time, Fully Diff In/Out
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LT1568 Low Noise, 10MHz 4th Order Building Block Lowpass or Bandpass, Diff Outputs
LT6600-2.5 Low Noise Differential Amp and 10MHz Lowpass 55µV
RMS
Noise 100kHz to 10MHz, 3V Supply
LT6600-10 Low Noise Differential Amp and 20MHz Lowpass 86µV
RMS
Noise 100kHz to 20MHz, 3V Supply
