LTC1264 High Speed, Quad Universal Filter Building Block FEATURES DESCRIPTIO High Speed, Up to 250kHz Center Frequency The LTC 1264 consists of four identical, high speed 2nd Four Identical Filters in a 0.3 Wide Package order switched-capacitor filter building blocks designed Clock-to-Center Frequency Ratio of 20:1 for center frequencies up to 250kHz. Each building block, Double-Sampling, Improved Aliasing together with three to five resistors, can provide 2nd order Operates from 2.37V to 8V Power Supplies functions like lowpass, highpass, bandpass and notch. Customized Version with Internal Resistors Available The center frequency of each 2nd order section is tuned via Low Noise an external clock. The clock-to-center frequency ratio is Low Harmonic Distortion internally set to 20:1, but it can be modified via external Available in 24-Pin DIP and SO Wide Packages resistors. U The aliasing performance of the LTC1264 is improved by APPLICATIO S double-sampling each 2nd order section. Input signal frequencies can reach up to twice the clock frequency Digital Communications before any alias products will be detectable. Spread Spectrum Communications Spectral Analysis For Q 5 and for T < 85C, the maximum center A Loran Receivers frequency is 160kHz. For Q 2, the maximum center Instrumentation frequency is 250kHz. Up to 8th order filters can be realized by cascading all four 2nd order sections. , 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. TYPICAL APPLICATIO Clock-Tunable 8th Order Bandpass Filter, f = f /20 CENTER CLK 50k Gain vs Frequency 50k 100kHz Bandpass, f Bandwidth = f /10 3dB CENTER IN INV B INV C 10k 10k HPB/NB HPC/NC 10 50k 50k BPB BPC 0 MAXIMUM POWER LPB LPC 10 f SUPPLY CENTER SB SC 20 160kHz 7.5V LTC1264 120kHz 5V AGND V 30 60kHz Single 5V 0.1F + f V CLK CLK 40 0.1F SA SD 50 LPA LPD 60 OUT 50k BPA BPD 70 50k 10k HPA/NA HPD/ND 80 10k 10k 100k 1M INV A INV D FREQUENCY (Hz) 1264 TA02 50k 50k 1264 TA01 1264fb 1 GAIN (dB) U ULTC1264 /O ABSOLUTEXAI U RATI GS PACKAGE RDER I FOR ATIO (Note 1) TOP VIEW ORDER PART + INV B 1 24 INV C Total Supply Voltage (V to V ) .............................. 16V NUMBER HPB/NB 2 23 HPC/NC + Input Voltage (Note 2) ........... (V + 0.3V) to (V 0.3V) BPB 3 BPC 22 LPB 4 21 LPC Output Short-Circuit Duration .......................... Indefinite LTC1264CN SB 5 20 SC Power Dissipation............................................. 400mW LTC1264CSW AGND 6 19 V + Burn-In Voltage ...................................................... 16V V 7 18 CLK SA 8 17 SD Operating Temperature Range ............... 40C to 85C LPA 9 16 LPD Storage Temperature Range ................ 65C to 150C BPA 10 15 BPD HPA/NA 11 14 HPD/ND Lead Temperature (Soldering, 10 sec).................. 300C INV A 12 13 INV D N PACKAGE SW PACKAGE 24-LEAD PLASTIC DIP 24-LEAD PLASTIC SO (WIDE) T = 110C, = 65C/W (N) JMAX JA T = 110C, = 85C/W (S) JMAX JA Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: