LTC1065

The LTC1065 is the first monolithic filter providing bothclock-tunability with low DC output offset and over 12-bitDC accuracy. The frequency response of the LTC1065closely approximates a 5th order Bessel polynomial. Withappropriate PCB layout techniques the output DC offset istypically 1mV and is constant over a wide range of clockfrequencies. With ±5V supplies and ±4V input voltagerange, the CMR of the device is typically 80dB.

The filter cutoff frequency is controlled either by an inter-nal or external clock. The clock-to-cutoff frequency ratio is100 : 1. The on-board clock is nearly power supply inde-pendent and it is programmed via an external RC. The50µVRMS clock feedthrough of the device is considerablylower than other existing monolithic filters.

The LTC1065 wideband noise is 80µVRMS and it canprocess large AC input signals with low distortion. With±7.5V supplies, for instance, the filter handles up to4VRMS (94dB S/N ratio) while the standard 1kHz THD isbelow 0.005%; 87dB dynamic range (S/N + THD) is ob-tained with input levels between 2VRMS and 2.5VRMS.

The LTC1065 is available in 8-pin miniDIP and 16-pin SOL.For a Butterworth response, see LTC1063 data sheet. TheLTC1065 is pin compatible with the LTC1063.