Features: 1. with a filter design software, with a microprocessor interface; 2. can control 64 different center frequency f0, 128 different quality factor Q and 4 kinds of work patterns; 3. the center frequency f0 and quality factor Q can be independently programmed; 4. can provide three clock input (external clock input, RC oscillator and crystal devices); 5. the central frequency f0 range of 1Hz ~ 140kHz, the maximum input clock 4MHz; 6. the filter circuit structure is simple, less external components, small size; 7. can achieve low-pass, high-pass, band-pass, band-stop and all-pass filter; 8. can be A, B single-stage input and output, but also AB cascade of two levels of input and output; 9. Product size: 50*50MM 10. Product weight: 22 grams The main chip pin description: V + - positive power input. V- -Negative power input. GND - Analog ground. CLKA - external crystal oscillator and filter A part of the clock input, within the filter, the clock frequency is divided by 2. CLKB - the clock input to filter B, also within the filter, the clock frequency is divided by 2. CLKOUT - Clock output for crystal oscillator and R-C oscillation. OSCOUT - Connects to a crystal or R-C oscillator for self-synchronization. INA, INB - The signal input of the filter. BPA, BPB - band-pass filter output. LPA, LPB - low-pass filter output. HPA, HPB - high-pass, with resistance, all-pass filter output. WR - Writing to the active input. When connected to V +, the data can be entered into a programmable memory through the logical interface to complete the filter mode, f0 and Q settings. In addition, it can receive TTL level signals, and the rising edge latch input data. A0, A1, A2, A3 - address input, can be used to complete the filter mode, f0 and Q of the corresponding settings. D0, D1 - Data input, can be used to set the corresponding bits f0 and Q. OP OUT - The amplifier output of the MAX262. OP IN - The inverting input of the MAX262 amplifier. Packing list: Program-controlled filter * 1

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