Analog Devices, Inc. (NASDAQ: ADI), a global leader in high-performance signal processing solutions, has launched the **AD7403**, the most accurate isolated sigma-delta modulator available in the industry, designed for precise current and voltage measurements in DC/AC power conversion applications. The **AD7403** delivers an impressive 81 dB signal-to-noise ratio (SNR) and a minimum SINAD of 78 dB at 78 KSPS under operating temperatures ranging from -40°C to +125°C — a performance level that is 11 times higher than competing devices. This enhanced signal-to-noise ratio allows for more accurate current and voltage readings, which can significantly reduce torque ripple in motor shafts, improving overall motor drive performance. Additionally, the improved SINAD contributes to higher efficiency in DC/AC inverter systems such as motor drives, solar inverters, and wind energy converters. ![AD7403](http://i.bosscdn.com/blog/20/17/11/2716310801004.png) The **AD7403** integrates Analog Devices’ **iCoupler™** digital isolation technology, offering a single-chip solution that converts analog signals into 1-bit data streams with a maximum clock frequency of up to 20 MHz. It enables precise voltage measurement across a shunt resistor, making it ideal for high-voltage DC bus applications and motor drives. Engineers can now replace less accurate and more expensive Hall effect sensors with this device, which supports higher isolation voltages (up to 1250 V peak). You can view the full datasheet here: [AD7403 Datasheet](http://datasheet.eepw.com.cn/datasheet/show/id/3121156) Thanks to its high performance, the **AD7403** allows for the use of smaller shunt resistors, reducing heat dissipation while maintaining measurement accuracy. This makes it a highly efficient and cost-effective choice for precision applications. ### Key Features of the AD7403 Isolated Sigma-Delta Modulator: - External clock input range: 5 MHz to 20 MHz - 16-bit no missing code - Typical offset drift: 1.5 μV/°C - On-chip digital isolator - On-chip reference - True bipolar analog input range: ±320 mV - High common-mode transient immunity: >25 kV/μs ![AD7403 Applications](http://i.bosscdn.com/blog/20/17/11/2716312601754.png) The **AD7403** is well-suited for integration with other Analog Devices products used in motor control and power conversion systems, including the **ADSP-CM40x** mixed-signal control processor, the **ADuM6000** isolated 5 kV DC/DC converter, and the **ADP2441** 36 V, 1 A synchronous step-down DC/DC regulator. This compatibility ensures seamless system design and improved performance in a wide range of industrial and renewable energy applications.

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