LTC1064-3
Low Noise, High Frequency,
8th Order Linear Phase Lowpass Filter
FEATURES
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DESCRIPTIO
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8th Order Filter in a 14-Pin Package
95kHz Maximum Corner Frequency
No External Components
75:1, 150:1 and 120:1 Clock to Cutoff Frequency
Ratio
60µV
RMS
Total Wideband Noise
0.03% THD or Better
Operates from
±2.37V
to
±8V
Power Supplies
Low Total Output DC Offset
The LTC
®
1064-3 is a monolithic 8th order lowpass Bessel
filter, which provides a linear phase response over its
entire passband. An external TTL or CMOS clock pro-
grams the filter’s cutoff frequency. The clock to cutoff
frequency ratio is 75:1 (Pin 10 at V
+
) or 150:1 (Pin 10 at
V
–
) or 120:1 (Pin 10 at GND). The maximum cutoff
frequency is 95kHz. No external components are needed.
The LTC1064-3 features low wideband noise and low
harmonic distortion even for input voltages up to 3V
RMS
.
In fact the LTC1064-3 overall performance competes with
equivalent multiple op amp RC active realizations. The
LTC1064-3 is available in a 14-pin DIP or 16-pin surface
mounted SOL package. The LTC1064-3 is fabricated using
LTC’s enhanced analog CMOS Si-gate process.
The LTC1064-3 is pin compatible with the LTC1064-1,
LTC1064-2 and LTC1064-4.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
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Antialiasing Filters
Smoothing Filters
Tracking High Frequency Lowpass Filters
TYPICAL APPLICATIO
8th Order Clock Sweepable Lowpass Bessel Filter
1
V
IN
2
3
4
5
6
7
NC
V
IN
OUT C
NC
14
13
–8V
CLOCK = 7MHz
0.1µF
Measured Frequency Response
0
–15
–30
V
OUT
/V
IN
(dB)
LTC1064-3
12
V
–
AGND
V
+
AGND
NC
INV A
f
CLK
75/150
V
OUT
NC
11
–45
–60
–75
8V
0.1µF
10
+
V
9
8
V
OUT
1064 TA01a
–90 V
S
=
±7.5V,
f
CLK
= 7MHz, PIN 10 TO V
+
,
f
–3dB
= 95kHz, GROUP DELAY = 6µs
–105
100
10
FREQUENCY (kHz)
NOTE: THE POWER SUPPLIES SHOULD BE BYPASSED BY A 0.1µF
OR LARGER CAPACITOR CLOSE TO THE PACKAGE. THE CONNECTI0N
BETWEEN PIN 7 AND PIN 14 SHOULD BE MADE UNDER THE IC PACKAGE.
U
1000
1064-3 TA01b
U
U
10643fa
1
LINEAR_DIMENSIONS [ LINEAR DIMENSIONS SEMICONDUCTOR ]
