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¡¡¡¡The AD7401A1 is a second-order£¬ sigma-delta £¨¦²-¦¤£© modulator that converts an analog input signal into a high speed£¬ 1-bit data stream with on-chip digital isolation based on Analog Devices£¬ Inc.£¬ iCoupler? technology. The AD7401A operates from a 5 V power supply and accepts a differential input signal of ¡À250 mV £¨¡À320 mV full scale£©¡£ The analog input is continuously sampled by the analog modulator£¬ eliminating the need for external sample-and-hold circuitry. The input information is contained in the output stream as a density of ones with a data rate up to 20 MHz. The original information can be reconstructed with an appropriate digital filter. The serial I/O can use a 5 V or a 3 V supply £¨VDD2£©¡£ The serial interface is digitally isolated. High speed CMOS£¬ combined with Analog Devices£¬ Inc.£¬ iCoupler? technology £¬ means the on-chip isolation provides outstanding performance characteristics£¬ superior to alternatives such as optocoupler devices. The part contains an on-chip reference. The AD7401A is offered in a 16-lead SOIC and has an operating temperature range of ?40¡ãC to +125¡ãC.