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LTC1064-7MJ Datasheet

  • LTC1064-7MJ

  • Linear Phase, 8th Order Lowpass Filter

  • 12頁

  • LINER

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LTC1064-7
Linear Phase, 8th Order
Lowpass Filter
FEATURES
s
s
s
s
s
DESCRIPTIO
s
s
s
Steeper Roll-Off Than 8th Order Bessel Filters
f
CUTOFF
up to 100kHz
Phase Equalized Filter in 14-Pin Package
Phase and Group Delay Response Fully Tested
Transient Response Exhibits 5% Overshoot and
No Ringing
Wide Dynamic Range
72dB THD or Better Throughout a 50kHz Passband
No External Components Needed
The LTC1064-7 is a clock-tunable monolithic 8th order
lowpass filter with linear passband phase and flat group
delay. The amplitude response approximates a maximally
flat passband whilte it exhibits steeper roll-off than an
equivalent 8th order Bessel filter. For instance, at twice the
cutoff frequency the filter attains 34dB attenuation (vs
12dB for Bessel), while at three times the cutoff frequency
the filter attains 68dB attenuation (vs 30dB for Bessel).
The cutoff frequency of the LTC1064-7 is tuned via an
external TTL or CMOS clock.
The LTC1064-7 features wide dynamic range. With single
5V supply, the S/N + THD is 76dB. Optimum 92dB S/N is
obtained with
鹵7.5V
supplies.
The clock-to-cutoff frequency ratio of the LTC1064-7 can
be set to 50:1 (pin 10 to V
+
) or 100:1 (pin 10 to V
鈥?/div>
).
When the filter operates at clock-to-cutoff frequency ratio
of 50:1, the input is double-sampled to lower the risk of
aliasing.
The LTC1064-7 is pin-compatible with the LTC1064-X
series, LTC1164-7 and LTC1264-7.
APPLICATI
s
s
s
S
Data Communication Filters
Time Delay Networks
Phase-Matched Filters
TYPICAL APPLICATI
1
V
IN
2
3
7.5V
4
5
6
7
LTC1064-7
80kHz Linear Phase Lowpass Filter
14
13
12
11
10
9
8
1064-7 TA01
鈥?.5V
CLK = 4MHz
V
OUT
NOTE: THE POWER SUPPLIES SHOULD BE BYPASSED BY A
0.1碌F CAPACITOR CLOSE TO THE PACKAGE AND ANY PRINTED
CIRCUIT BOARD ASSEMBLY SHOULD MAINTAIN A DISTANCE
OF AT LEAST 0.2 INCHES BETWEEN ANY OUTPUT OR INPUT
PIN AND THE f
CLK
LINE.
1V/DIV
7.5V
V
S
=
鹵7.5V
f
CLK
= 4MHz
RATIO = 50:1
U
Eye Diagram
1碌s/DIV
1064-7 TA02
UO
UO
1

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