The LTC1064-4 is an 8th order, clock sweepable Cauer lowpass switched capacitor filter. An external TTL or CMOS clock programs the value of the filter's cutoff frequency. With Pin 10 at V +, the fCLK to fCUTOFF ratio is 50:1; the filter has a Cauer response and with compensation the passband ripple is 0.1dB. The stopband attenuation is 80dB at 2 x fCUTOFF. Cutoff frequencies up to 100kHz can be achieved. With Pin 10 at V , the fCLK to f 3dB ratio is 100:1, the filter has a transitional ButterworthCauer response with lower noise and lower delay nonlinearity than the Cauer response. The stopband attenuation at 2.5 x f 3dB is 92dB. Cutoff frequencies up to 50kHz can be achieved.