鈻?/div>
Antialiasing Filters
Telecom Filters
Spectral Analysis
Loop Filters
For Fixed Lowpass Filter Requirements use the
LTC1164-XX Series
The LTC
廬
1164 consists of four low power, low noise
2nd order switched capacitor filter building blocks. Each
building block typically consumes 850碌A supply current.
Low power is achieved without sacrificing noise and
distortion. Each building block, together with 3 to 5
resistors, can provide 2nd order functions like lowpass,
highpass, bandpass, and notch. The center frequency of
each 2nd order section can be tuned with an external clock,
or a clock and resistor ratio. For Q < 5, the center frequency
range is from 0.1Hz to 20kHz. Up to 8th order filters can
be realized by cascading all four 2nd order sections. Any
classical filter realization (such as Butterworth, Cauer,
Bessel, and Chebyshev) can be formed.
A customized monolithic version of the LTC1164
including internal thin film resistors can be obtained.
Consult LTC Marketing for details.
The LTC1164 is manufactured using Linear Technology鈥檚
enhanced LTCMOS
鈩?/div>
silicon gate process.
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTCMOS trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
Dual 5th Order Linear Phase Filter with Stopband Notch
549k
63.4k
210k
V
IN1
102k
133k
174k
1
2
3
4
24
23
22
21
78.7k
8.66k
V
OUT1
5
6
V
+
0.1碌F
174k
7
8
9
133k 10
102k
V
IN2
210k
11
12
LTC1164
20
19
18
17
16
15
14
13
63.4k
549k
49.9k
78.7k
36.5k
f
CLK
8.66k
V
OUT2
C2
0.1碌F
C1
V
鈥?/div>
49.9k
GAIN (dB)
Dual 5th Order Linear Phase Filter with
Stopband Notch, f
CLK
= 500kHz
10.00
0.0
鈥?0.00
鈥?0.00
V
OUT2
V
OUT1
36.5k
鈥?0.00
鈥?0.00
鈥?0.00
鈥?0.00
鈥?0.00
鈥?0.00
鈥?0.00
1k
SUPPLY
VOLTAGE
V
IN
C1 = 0.0033碌F
C2 = 0.0068碌F
f
CLK
= 500kHz
WIDEBAND NOISE = 50碌V
RMS
TOTAL SUPPLY CURRENT = 3mA
ALL RESISTORS ARE 1% METAL FILM
鹵2.5
鹵5.0
鹵7.5
1V
RMS
2V
RMS
4V
RMS
LTC1164 鈥?TA01
U
10k
FREQUENCY (Hz)
100k
LTC1164 鈥?TA02
U
U
TOTAL
HARMONIC DISTORTION
SIGNAL/NOISE
0.015% (鈥?6dB)
0.025% (鈥?2dB)
0.04% (鈥?8dB)
86dB
92dB
98dB
1164fa
1
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