LTC1264 Datasheet | Linear Technology

LTC1264 High Speed, Quad Universal Filter Building Block Features s s s s s s s s DESCRIPTIO High Speed, Up to 250k Hz 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 ± 2.37V to ± 8V Power Supplies Customized Version with Internal Resistors Available Low Noise Low Harmonic Distortion The LTC ®1264 consists of four identical, high speed 2nd order switched-capacitor filter building blocks designed for center frequencies up to 250k Hz. 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 ≤ 5 and for TA < 85°C, the maximum center frequency is 160k Hz. For Q ≤ 2, the maximum center frequency is 250k Hz. Up to 8th order filters can be realized by cascading all four 2nd order sections. A customized monolithic version of the LTC1264 including internal thin film resistors can be obtained. APPLICATI s s s s s Digital munications Spread Spectrum munications 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 160k Hz ±7.5V 120k Hz ±5V 60k Hz Single 5V 0.1µF 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- CLK SD LPD BPD HPD/ND 10k INV D 50k 1264 TA01 Gain vs Frequency 100k Hz Bandpass, f - 3d B Bandwidth = f CENTER/10 10 0 - 10 - 20 GAIN...