LTC1164-5 - Low Power 8th Order Pin Selectable Butterworth Or Bessel Lowpass Filter
Low power operation is achieved without compromising noise or distortion performance. With 5V supplies and 10kHz cutoff frequency, the operating signal-to-noise ratio is 86dB and the THD throughout the passband is 0.015%. Under the same conditions, a 77dB signal-to-noise ratio and distortion is obtained with a single 5V supply while the Clock feedthrough is kept below the noise level. The maximum signal-to-noise ratio is 92dB.
The LTC1164-5 approximates an 8th order Butterworth response with a clock-to-cutoff frequency ratio of 100:1 (Pin 10 to V) or 50:1 double-sampled (Pin 10 to V+ and Pin 1 shorted to Pin 13). Double-sampling allows the input signal frequency to reach the Clock frequency before any aliasing occurrence. An 8th order Bessel response CAN also be approximated with a clock-to-cutoff frequency ratio of 140:1 (Pin 10 to ground). With 7.5V supply, 5V supply and single 5V supply, the maximum Clock frequency of the LTC1164-5 is 1.5MHz, 1MHz, and 1MHz respectively. The LTC1164-5 is pin-compatible with the LTC1064-2 and LTC-1064-3.
By Linear Technology Corporation
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