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LTC1064-2_15 Datasheet, PDF (1/12 Pages) Linear Technology – Low Noise, High Frequency, 8th Order Butterworth Lowpass Filter | |||
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LTC1064-2
Low Noise, High Frequency,
8th Order Butterworth Lowpass Filter
FEATURES
â 8th Order Filter in a 14-Pin Package
â 140kHz Maximum Corner Frequency
â No External Components
â 50:1 and 100:1 Clock to Cutoff Frequency Ratio
â 80µVRMS Total Wideband Noise
â 0.03% THD or Better
â Operates from ±2.37V to ±8V Power Supplies
U
APPLICATIO S
â Antialiasing Filters
â Smoothing Filters
â Tracking High Frequency Lowpass Filters
DESCRIPTIO
The LTC®1064-2 is a monolithic 8th order lowpass
Butterworth filter, which provides a maximally flat pass-
band. The attenuation slope is â48dB/octave and the
maximum attenuation is in excess of 80db. An external
TTL or CMOS clock programs the filterâs cutoff frequency.
The clock to cutoff frequency ratio is 100:1 (Pin 10 at
Vâ) or 50:1 (Pin 10 at V +). The maximum cutoff frequency
is 140kHz. No external components are needed.
The LTC1064-2 features low wideband noise and low
harmonic distortion even for input voltages up to 3VRMS.
In fact the LTC1064-2 overall performance competes with
equivalent multiple op amp RC active realizations. The
LTC1064-2 is available in a 14-pin DIP or 16-pin surface
mounted SW package. The LTC1064-2 is fabricated using
LTCâs enhanced analog CMOS Si-gate process.
The LTC1064-2 is pin compatible with the LTC1064-1.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
8th Order Clock Sweepable
Lowpass Butterworth Filter
1
NC
14
OUT C
2 LTC1064-2 13
VIN
NC
3
AGND
Vâ
12
â8V
8V 4 V+
fCLK 11 CLOCK = 5MHz
5
10
AGND 50/100
6
NC
9
VOUT
7
RIN A
8
NC
1064 TA01a
NOTE: THE POWER SUPPLIES SHOULD BE BYPASSED BY A 0.1µF
CAPACITOR CLOSE TO THE PACKAGE. THE NC PINS 1, 6, 8,
AND 13 SHOULD BE PREFERABLY GROUNDED.
Measured Frequency Response
0
VS = ±7.5V
â15
â30
â45
â60
â75
â90
â105
0 100 200 300 400 500 600 700
FREQUENCY (kHz)
1064-2 TA01b
10642fa
1
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