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LTC1264CS Datasheet

  • LTC1264CS

  • Linear Technology [High Speed, Quad Universal Filter Buildi...

  • LINER

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LTC1264
High Speed, Quad Universal
Filter Building Block
FEATURES
s
s
s
s
s
s
s
s
DESCRIPTIO
High Speed, Up to 250kHz Center Frequency
Four Identical Filters in a 0.3" Wide Package
Clock-to-Center Frequency Ratio of 20:1
Double-Sampling, Improved Aliasing
Operates from
鹵2.37V
to
鹵8V
Power Supplies
Customized Version with Internal Resistors Available
Low Noise
Low Harmonic Distortion
The LTC
廬
1264 consists of four identical, high speed 2nd
order switched-capacitor filter building blocks designed
for center frequencies up to 250kHz. Each building block,
together with three to five resistors, can provide 2nd order
functions like lowpass, highpass, bandpass and notch.
The center frequency of each 2nd order section is tuned via
an external clock. The clock-to-center frequency ratio is
internally set to 20:1, but it can be modified via external
resistors.
The aliasing performance of the LTC1264 is improved by
double-sampling each 2nd order section. Input signal
frequencies can reach up to twice the clock frequency
before any alias products will be detectable.
For Q
鈮?/div>
5 and for T
A
< 85擄C, the maximum center
frequency is 160kHz. For Q
鈮?/div>
2, the maximum center
frequency is 250kHz. Up to 8th order filters can be realized
by cascading all four 2nd order sections.
A customized monolithic version of the LTC1264 includ-
ing internal thin film resistors can be obtained.
APPLICATI
s
s
s
s
s
S
Digital Communications
Spread Spectrum Communications
Spectral Analysis
Loran Receivers
Instrumentation
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATI
50k
IN
10k
HPB/NB
50k
BPB
MAXIMUM POWER
f
CENTER
SUPPLY
160kHz
鹵7.5V
120kHz
鹵5V
60kHz
Single 5V
0.1碌F
LPB
SB
AGND
V
+
SA
LPA
50k
BPA
10k
HPA/NA
INV A
50k
INV B
Clock-Tunable 8th Order Bandpass Filter, f
CENTER
= f
CLK
/20
50k
INV C
10k
HPC/NC
50k
BPC
LPC
LTC1264
SC
V
鈥?/div>
CLK
SD
LPD
BPD
HPD/ND
10k
INV D
50k
1264 TA01
Gain vs Frequency
100kHz Bandpass, f
鈥?dB
Bandwidth = f
CENTER
/10
10
0
鈥?0
鈥?0
GAIN (dB)
鈥?0
鈥?0
鈥?0
f
CLK
0.1碌F
OUT
50k
鈥?0
鈥?0
鈥?0
10k
100k
FREQUENCY (Hz)
1M
1264 TA02
U
UO
UO
1

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