LTC1064-7 Datasheet | Linear Technology

LTC1064-7 Linear Phase, 8th Order Lowpass Filter Features s s s s s DESCRIPTIO s s s Steeper Roll-Off Than 8th Order Bessel Filters f CUTOFF up to 100k Hz Phase Equalized Filter in 14-Pin Package Phase and Group Delay Response Fully Tested Transient Response Exhibits 5% Overshoot and No Ringing Wide Dynamic Range 72d B THD or Better Throughout a 50k Hz Passband No External ponents Needed The LTC1064-7 is a clock-tunable monolithic 8th order lowpass filter with linear passband phase and flat group delay. The amplitude response approximates a maximally flat passband whilte it exhibits steeper roll-off than an equivalent 8th order Bessel filter. For instance, at twice the cutoff frequency the filter attains 34d B attenuation (vs 12d B for Bessel), while at three times the cutoff frequency the filter attains 68d B attenuation (vs 30d B for Bessel). The cutoff frequency of the LTC1064-7 is tuned via an external TTL or CMOS clock. The LTC1064-7 Features wide dynamic range. With single 5V supply, the S/N + THD is 76d B. Optimum 92d B S/N is obtained with ±7.5V supplies. The clock-to-cutoff frequency ratio of the LTC1064-7 can be set to 50:1 (pin 10 to V +) or 100:1 (pin 10 to V - ). When the filter operates at clock-to-cutoff frequency ratio of 50:1, the input is double-sampled to lower the risk of aliasing. The LTC1064-7 is pin-patible with the LTC1064-X series, LTC1164-7 and LTC1264-7. APPLICATI s s s Data munication Filters Time Delay Networks Phase-Matched Filters TYPICAL APPLICATI 1 VIN 2 3 7.5V 4 5 6 7 LTC1064-7 80k Hz Linear Phase Lowpass Filter 14 13 12 11 10 9 8 1064-7 TA01 - 7.5V CLK = 4MHz VOUT NOTE: THE POWER SUPPLIES SHOULD BE BYPASSED BY A 0.1µF CAPACITOR CLOSE TO THE PACKAGE AND ANY PRINTED CIRCUIT BOARD ASSEMBLY SHOULD MAINTAIN A DISTANCE OF AT LEAST 0.2 INCHES BETWEEN ANY OUTPUT OR INPUT PIN AND THE f CLK LINE. 1V/DIV 7.5V VS = ± 7.5V f CLK = 4MHz RATIO = 50:1 Eye Diagram 1µs/DIV 1064-7 TA02 LTC1064-7 ABSOLUTE AXI U RATI...