Design of Multi-function Programmable Filter With LTC1064

For overcoming the disadvantages that the center frequency and cut-off frequency can not be changed easily in a conventional filter, a design scheme of multi-function programmable filter with LTC1064 was proposed, in which the alteration of filter's central frequency and cut-off frequency can be done easily by using the single-chip processor to vary the clock frequency of LTC1064 from the output of AD9851, implementing the conversion of various filters by changing the connection of output pins.The test results show that the various indices of the filter all meet the demand of design.