Conventional analog filter is by changing the RLC parameter change filter frequency response characteristics of discrete component, its parameter adjustment is difficult, and this kind of filter usually can only achieve a filter function. Analog filter using RLC discrete component, not only large and difficult to guarantee accuracy. Obviously, often even in need real-time adjust the filter frequency response and filter function, the traditional analog filter is not very convenient.Switched Capacitor Filter (Switch Capacitor Filter, abbreviated SCF) using sampling system to simulate the characteristics of continuous Filter.The cut-off frequency of the switched capacitor filter center frequency or with an external clock input signal (sampling clock), may be changed by adjusting the frequency of the clock input signal filter center frequency or cut-off frequency, so as to realize the programmable.

Switched capacitor filter integration chip microprocessor can be divided into pin programmable and programmable two kinds.Pin programmable switch capacitor filter center frequency or cutoff frequency can be determined by the frequency of the clock signal or decided jointly by external resistance value and the clock signal frequency, Q value is decided by the external resistance;Microprocessor programmable switch capacitor filter through digital programming code control chip clock frequency and filter center frequency or cut-off frequency ratio and filter QValue. Therefore, the switched capacitor filter chip is very suitable for programmable filtering system, and the peripheral circuit is very simple and work to control.

Therefore, Ling Chi electronic portrait launch this active filter module is for everyone to save your design, layout, was debugging time.

The Active filter universal moduleMain characteristicsAs follows:

(1) achieve the high order, Low pass and BandpassFilter, amplitude frequency response is good, the as ofControllable frequencyProgram - controlledHigh accuracy;

(2) using the commonly used LTC1068seriesThe user can replace the chip model "according to the actual demand, the Default useLTC1068;LTC1068-200 the cut - off frequency range0.5 Hz ~ 25 KHZ.LTC1068-25 cut - off frequency range4Hz ~ 200 KHZ.LTC1068-50 cut - off frequency range2Hz ~ 50 KHZ.LTC1068Cut - off frequency range1Hz ~ 50 KHZ.

(3 module defaults. 5 vpower supply;

(4) modules gain by default to 0 dbmaximum undistortedInput range = 4.1 V.

(5) input/output interface using two forms, one is the pin interface, one is the SMA interface, the default Use pin interface;

(6) this module has designed the jackGNDFor inserting a multimeter, grounding pen, to facilitate the user testing.

(7 can be on the actual needs of the users, CustomizedAppropriate module. Because the was debugging process is very complicated, it needs to be added a certain amountCustomization fee.

Special explanation: The filter comes with The design tools, greatly facilitate The user to design company's types of filters, in The user manual will have a very perfect tutorial, easy to use. Buy this moduleDefault shipmentFor: 8 step lowpass filterIf you needOther types of filtersWe 'l l charge you a certain amountCustom feeds!