View lt11647 datasheet:

LTC1164-7 Low Power, Linear Phase 8th Order Lowpass Filter DESCRIPTIO FEATURES Better Than Bessel Roll-Off The LTC1164-7 is a low power, clock-tunable monolithic fCUTOFF up to 20kHz, Single 5V Supply 8th order lowpass filter with linear passband phase and ISUPPLY = 2.5mA (Typ), Single 5V Supply flat group delay. The amplitude response approximates a 75dB THD + Noise with Single 5V Supply maximally flat passband and exhibits steeper roll-off than Phase and Group Delay Response Fully Tested an equivalent 8th order Bessel filter. For instance, at twice Transient Response with No Ringing the cutoff frequency the filter attains 34dB attenuation Wide Dynamic Range (vs12dB for Bessel), while at three times the cutoff fre- No External Components Needed quency the filter attains 68dB at