AD7400A

Preliminary Technical Data Isolated Sigma-Delta Modulator AD7400A FEATURES 10 MHz clock rate Second-order modulator 16 bits no missing codes ±2 LSB INL typical at 16 bits 3.5 µV/°C maximum offset drift On-board digital isolator On-board reference Low power operation: 18 mA maximum at 5.25 V −40°C to +125°C operating range 16-lead SOIC, 8-lead gull-wing surface mount DIP packages AD7401A, external clock version Safety and regulatory approvals UL recognition 3750 V rms 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 = 891 V peak APPLICATIONS GENERAL DESCRIPTION The AD7400A1 is a second-order, Σ-Δ 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 AD7400A operates from a 5 V power supply and accepts a differential input signal of ±200 mV (±320 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 of 10 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 monolithic air core transf...