LTC1164-7 Datasheet | Linear Technology

LTC1164-7 Low Power, Linear Phase 8th Order Lowpass Filter Features s s s s s s s s DESCRIPTIO Better Than Bessel Roll-Off f CUTOFF up to 20k Hz, Single 5V Supply ISUPPLY = 2.5m A (Typ), Single 5V Supply 75d B THD + Noise with Single 5V Supply Phase and Group Delay Response Fully Tested Transient Response with No Ringing Wide Dynamic Range No External ponents Needed APPLICATI s s s The LTC1164-7 is a low power, clock-tunable monolithic 8th order lowpass filter with linear passband phase and flat group delay. The amplitude response approximates a maximally flat passband and exhibits steeper roll-off than an equivalent 8th order Bessel filter. For instance, at twice the cutoff frequency the filter attains 34d B attenuation (vs12d 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 LTC1164-7 is tuned via an external TTL or CMOS clock. Low power is achieved without sacrificing dynamic range. With single 5V supply, the S/N + THD is up to 75d B. Optimum 91d B S/N is obtained with ± 7.5V supplies. The clock-to-cutoff frequency ratio of the LTC1164-7 can be set to 50:1 (pin 10 to V +) or 100:1 (pin 10 to V - ). When the filter operates at the clock-to-cutoff frequency ratio of 50:1, the input is double-sampled to lower the risk of aliasing. The LTC1164-7 is pin-patible with the LTC1064-X series and LTC1264-7. Data munication Filters Time Delay Networks Phase Matched Filters TYPICAL APPLICATI 1 VIN 2 3 5V 4 5 6 7 LTC1164-7 10k Hz Linear Phase Lowpass Filter 14 13 12 11 10 9 8 - 5V CLK = 500k Hz 5V VOUT - 10 - 20 GAIN (d B) - 30 - 40 - 50 - 60 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. 1164-7 TA01 - 70 - 80 1 10 FREQUENCY (k Hz) Frequency Response GAIN 150 140 130 DELAY 120 110 100 90 80 70...