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LTC1064-1

Description
Low Noise, 8th Order, Clock Sweepable Elliptic Lowpass Filter
File Size169KB,8 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC1064-1 Overview

Low Noise, 8th Order, Clock Sweepable Elliptic Lowpass Filter

LTC1064-1
Low Noise, 8th Order, Clock
Sweepable Elliptic Lowpass Filter
FEATURES
DESCRIPTIO
8th Order Filter in a 14-Pin Package
No External Components
100:1 Clock to Center Ratio
150µV
RMS
Total Wideband Noise
0.03% THD or Better
50kHz Maximum Corner Frequency
Operates from
±2.37V
to
±8V
Power Supplies
Passband Ripple Guaranteed Over Full Military
Temperature Range
The LTC
®
1064-1 is an 8th order, clock sweepable elliptic
(Cauer) lowpass switched capacitor filter. The passband
ripple is typically
±0.15dB,
and the stopband attenuation
at 1.5 times the cutoff frequency is 68dB or more.
An external TTL or CMOS clock programs the value of the
filter’s cutoff frequency. The clock to cutoff frequency ratio
is 100:1.
No external components are needed for cutoff frequencies
up to 20kHz. For cutoff frequencies over 20kHz two low
value capacitors are required to maintain passband flatness.
The LTC1064-1 features low wideband noise and low
harmonic distortion even for input voltages up to 3V
RMS
.
In fact the LTC1064-1 overall performance completes with
equivalent multiple op amp RC active realizations.
The LTC1064-1 is available in a 14-pin DIP or 16-pin
surface mounted SW package.
The LTC1064-1 is pin compatible with the LTC1064-2.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
Antialiasing Filters
Telecom PCM Filters
TYPICAL APPLICATIO
1
V
IN
2
3
8V
0.1µF
14
13
8th Order Clock Sweepable Lowpass
Elliptic Antialiasing Filter
15
0
–15
INV C
V
IN
R(h, I)
COMP2*
V
OUT
/V
IN
(dB)
AGND
4
+
LTC1064-1
11
CLOCK
f
CLK
V
(TTL,
≤5MHz)
5
10
NC
AGND
6
7
COMP1*
INV A
V
OUT
NC
9
8
V
OUT
12
V
–8V
0.1µF
–30
–45
–60
–75
–90
–105
0
5
10
15 20 25 30
FREQUENCY (kHz)
35
40
1064 TA01
NOTE: THE POWER SUPPLIES SHOULD BE BYPASSED BY A 0.1µF
CAPACITOR CLOSE TO THE PACKAGE.
FOR SERVO OFFSET NULLING APPLICATIONS, PIN 1 IS THE 2ND
STAGE SUMMING JUNCTION.
*FOR CUTOFF FREQUENCY ABOVE 20kHz, USE COMPENSATION
CAPACITORS (5pF TO 56pF) BETWEEN PIN 13 AND PIN 1
AND PIN 6 AND PIN 7.
8th ORDER CLOCK SWEEPABLE LOWPASS ELLIPTIC ANTIALIASING
FILTER MAINTAINS, FOR 0.1Hz
f
CUTOFF
10kHz, A
±0.15dB
PASSBAND
RIPPLE AND 72dB STOPBAND ATTENUATION AT 1.5
×
f
CUTOFF
.
TOTAL WIDEBAND NOISE = 150µV
RMS
, THD = 0.03% FOR V
IN
= 1V
RMS
10641fa
U
Frequency Response
1064 TA02
U
U
1

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LTC1064-1 LTC1064-1CN LTC1064-1ACN LTC1064-1_09
Description Low Noise, 8th Order, Clock Sweepable Elliptic Lowpass Filter Low Noise, 8th Order, Clock Sweepable Elliptic Lowpass Filter Low Noise, 8th Order, Clock Sweepable Elliptic Lowpass Filter Low Noise, 8th Order, Clock Sweepable Elliptic Lowpass Filter
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