The AD7403 is a high performance, second-order, Σ-Δ modulator that converts an analog input signal into a high speed, single-bit data stream, with on-chip digital isolation based on Analog Devices, Inc., iCoupler® technology. The AD7403 operates from a 5 V (VDD1) power supply and accepts a differential input signal of ±250 mV (±320 mV full-scale). The differential input is ideally suited to shunt voltage monitoring in high voltage applications where galvanic isolation is required.
The analog input is continuously sampled by a high performance analog modulator, and converted to a ones density digital output stream with a data rate of up to 20 MHz. The original information can be reconstructed with an appropriate digital filter to achieve 88 dB signal to noise ratio (SNR) at 78.1 kSPS. The serial input/output can use a 5 V or a 3 V supply (VDD2).
The serial interface is digitally isolated. High speed complementary metal oxide semiconductor (CMOS) technology, combined with monolithic transformer technology, means the on-chip isolation provides outstanding performance characteristics, superior to alternatives such as optocoupler devices. The AD7403 device is offered in a 16-lead, wide-body SOIC package and has an operating temperature range of −40°C to +125°C.
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|AD7403: 16-Bit, Isolated Sigma-Delt Modulator Data Sheet (Rev A, 11/2014) (pdf, 364 kB)||Data Sheets|
Working with Digital Isolators in Motor Control Applications
This webcast will look at the considerations and challenges at key isolation nodes within the motor control signal chain. Choice of an isolation architecture can greatly affect the final system architecture complexity and cost. The isolation required by safety standards for motor drive electronics can be addressed in multiple ways. We will examine some of the tradeoffs involved in designing a system under IEC standards.
|UG-683: Evaluating the AD7403 16-Bit, Isolated Sigma-Delta ADC (pdf, 1847 kB)||User Guides|
|MS-2652: Measurement Techniques for Industrial Motion Control (pdf, 1855 kB)||Technical Articles|
|Highest Accuracy Isolated Sigma-Delta Modulator Increases Efficiency of Motor Drives and Power Inverters (22 May 2014)||Press Releases||HTML|
|Glossary of EE Terms||Glossary||HTML|
Recommended DC/DC Converters for the AD7403
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.