AD7400 Datasheet | Analog Devices

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 m A maximum at 5.25 V - - 40°C to +105°C operating range - 16-lead SOIC package - 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 APPLICATIONS - AC motor controls - Data acquisition systems - A/D + opto-isolator replacements FUNCTIONAL BLOCK DIAGRAM Data Sheet AD7400 Isolated Sigma-Delta Modulator GENERAL DESCRIPTION The AD7400 is a second-order, sigma-delta (Σ-Δ) modulator that converts an analog input signal to a high speed, 1-bit data stream with on-chip digital isolation based on Analog Devices, Inc. i Coupler® technology. The AD7400 operates from a 5 V power supply and accepts a differential input signal of ±200 m V (±320 m V 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, bined with monolithic air core transformer 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 AD7400 is offered in a 16-lead SOIC and has an operating temperature range of - 40°C to +105°C. An external clock version, AD7401, is also available. Figure 1. 1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329. Rev. I DOCUMENT FEEDBACK TECHNICAL SUPPORT Information furnished by Analog Devices is believed to be accurate and...