The AD7401A is a second-order, sigma-delta (Σ-Δ) modulator that converts an analog input signal into a high speed, 1-bit data stream with on-chip digital isolation based on the Analog Devices, Inc., iCoupler® technology. The AD7401A operates from a 5 V power supply and accepts a pseudo-differential input signal of ±250 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 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 3.3 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 device contains an on-chip reference. The AD7401A is offered in a 16-lead SOIC and has an operating temperature range of −40°C to +125°C. Applications * AC motor controls * Shunt current monitoring * Data acquisition systems * Analog-to-digital and opto-isolator replacements * 20 MHz maximum external clock rate * Second-order modulator * 16 bits, no missing codes * ±2 LSB INL typical at 16 bits * 1 µV/°C typical offset drift * On-board digital isolator * On-board reference * ±250 mV analog input range * Low power operation: 17 mA typical at 5.5 V * −40°C to +125°C operating range * 16-lead SOIC package * Internal clock version: AD7400A * Safety and regulatory approvals * UL 1577 * VISO = 5000 V rms for 1 minute * IEC / CSA 62368-1 * IEC / CSA 61010-1 * DIN EN IEC 60747-17 (VDE 0884-17) * VIORM = 645 V peak * Qualified for Automotive Applications https://elecena.pl/product/757113/isolated-sigma-delta-modulator 2008-11-17 https://elecena.pl/product/757113/isolated-sigma-delta-modulator 2018-03-28 https://elecena.pl/product/757113/isolated-sigma-delta-modulator 2025-01-18