Photocoupler

Analog Devices, Inc. (NASDAQ: ADI ), the world's leading provider of high-performance signal processing solutions, has introduced the AD7403 , the industry's most accurate isolated sigma-delta modulator , for precision currents in DC/AC power conversion applications. Voltage measurement. The isolated Σ-Δ modulator AD7403 achieves 81-dB signal-to-noise ratio and SINAD (min) at 78 KSPS and -40°C to +125C°, which is 11 times higher than competing devices. dB. Higher signal-to-noise ratios enable more accurate current and voltage measurements, improving motor drive performance by reducing torque ripple on the motor shaft. In addition, higher SINA can increase the power conversion efficiency of DC/AC power inverter applications, such as motor drives, solar and wind inverters.

The AD7403 Σ-Δ Modulator Integrates Analog Devices ' ADI 's iCouplerTM Digital Isolation Technology

The AD7403 isolated sigma-delta modulator incorporates Analog Devices' iCouplerTM digital isolation technology to create a single-chip solution that converts analog signals into 1-bit data streams with a maximum clock frequency of up to 20 MHz. A voltage measurement across the shunt resistor is achieved. In higher DC bus voltage power conversion and motor drive applications, designers can replace lower precision, higher cost Hall effect sensors with higher isolation operating voltages (1250 V peak).

The AD7403 data sheet link address is: http://datasheet.eepw.com.cn/datasheet/show/id/3121156

This isolated Σ-Δ modulator has high performance, so a smaller shunt resistor can be used to reduce heat loss in the shunt resistor while maintaining measurement accuracy.

Main characteristics of the AD7403 isolated Σ-Δ modulator

5 MHz to 20 MHz external clock input rate

16-bit no missing code

Offset drift typical: 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

Quotation and supply

The AD7403 modulator is ideal for use with other ADI products designed for 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 sync Step-down DC/DC regulator.