AD7400

Isolated Sigma-Delta Modulator Preliminary Technical Data FEATURES Up to 20 MHz Data Rate (AD7401) 10 MHz Data Rate (AD7400) 2nd Order Modulator ±4 LSB INL @16 Bits Onboard Digital Isolator Onboard Reference Low Power Operation: 15 mA @ 5 V -40ЊC to +105Њ C Operating Range 16-ld SOIC Package Safety and Regulatory Approvals UL Recognition 3750 VRMS for 1 minute per UL 1577 CSA Component Acceptance Notice ~5A VDE Certificate of Conformity DIN EN 60747-5-2 (VDE 0884 Part 2):2003-01 DIN EN 60950 (VDE 0805): 2001-12; EN 60950:2000 VIORM = 840VPEAK AD7400/AD7401 APPLICATIONS AC Motor Control Data Acquisition Systems A/D + Opto-Isolator Replacement GENERAL DESCRIPTION The AD7400/AD7401 are 2nd order sigma-delta modulators that convert an analog input signal into a high speed 1-bit data stream with onboard digital isolation based on Analog Devices’ iCoupler® technology. The AD7400/AD7401 operate from a 5 V power supply and accept a differential input signal of ±200 mV. 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 data rates up to 20MHz. The original information can be reconstructed with an appropriate digital filter. The serial I/O may use a 5V or 3V supply (VDD2). The serial interface is digitally isolated. High-speed CMOS, FUNCTIONAL BLOCK DIAGRAM VDD1 VDD2 VIN+ VIN- T/H Σ-∆ ADC UPDATE ENCODE CONTROL LOGIC REF ENC...