View lt12647 datasheet:

LTC1264-7 Linear Phase, Group Delay Equalized, 8th Order Lowpass Filter DESCRIPTIO FEATURES Steeper Roll-Off Than Bessel Filters The LTC1264-7 is a clock-tunable monolithic 8th order High Speed: fC ? 200kHz lowpass filter with linear passband phase and flat group Phase Equalized Filter in a 14-Pin Package delay. The amplitude response approximates a maximally Phase and Group Delay Response Fully Tested flat passband and exhibits steeper roll-off than an equiva- Transient Response Exhibits 5% Overshoot and lent 8th order Bessel filter. For instance, at twice the cutoff No Ringing frequency the filter attains 28dB attenuation (vs 12dB for 65dB THD or Better Throughout a 100kHz Passband Bessel), while at three times the cutoff frequency the filter No External Components Needed at