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LTC1264_05 PDF预览

LTC1264_05

更新时间: 2024-11-11 05:00:43
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
16页 227K
描述
High Speed, Quad Universal Filter Building Block

LTC1264_05 数据手册

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LTC1264  
High Speed, Quad Universal  
Filter Building Block  
U
FEATURES  
DESCRIPTIO  
High Speed, Up to 250kHz Center Frequency  
The LTC®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.  
Thecenterfrequencyofeach2ndordersectionistunedvia  
an external clock. The clock-to-center frequency ratio is  
internally set to 20:1, but it can be modified via external  
resistors.  
Four Identical Filters in a 0.3" Wide Package  
Clock-to-Center Frequency Ratio of 20:1  
Double-Sampling, Improved Aliasing  
Operates from ±2.37V to ±8V Power Supplies  
Customized Version with Internal Resistors Available  
Low Noise  
Low Harmonic Distortion  
Available in 24-Pin DIP and SO Wide Packages  
U
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.  
APPLICATIO S  
Digital Communications  
Spread Spectrum Communications  
Spectral Analysis  
For Q 5 and for TA < 85°C, the maximum center  
frequency is 160kHz. For Q 2, the maximum center  
frequency is 250kHz. Up to 8th order filters can be realized  
by cascading all four 2nd order sections.  
Loran Receivers  
Instrumentation  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
A customized monolithic version of the LTC1264 includ-  
ing internal thin film resistors can be obtained.  
U
TYPICAL APPLICATIO  
Clock-Tunable 8th Order Bandpass Filter, f  
= f /20  
CLK  
CENTER  
50k  
Gain vs Frequency  
50k  
100kHz Bandpass, f  
Bandwidth = f  
/10  
–3dB  
CENTER  
IN  
INV B  
HPB/NB  
BPB  
INV C  
HPC/NC  
BPC  
10k  
50k  
10k  
50k  
10  
0
MAXIMUM POWER  
CENTER  
LPB  
LPC  
–10  
–20  
–30  
–40  
–50  
–60  
–70  
f
SUPPLY  
SB  
SC  
160kHz  
120kHz  
60kHz  
±7.5V  
±5V  
Single 5V  
LTC1264  
AGND  
V
0.1µF  
+
f
V
CLK  
SD  
CLK  
0.1µF  
SA  
LPA  
LPD  
OUT  
50k  
10k  
BPA  
BPD  
50k  
10k  
HPA/NA  
INV A  
HPD/ND  
INV D  
–80  
10k  
100k  
FREQUENCY (Hz)  
1M  
1264 TA02  
50k  
50k  
1264 TA01  
1264fb  
1

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