Welcome Here  Shenzhen Mingjiada Electronics Co., Ltd.

ADI High Performance AD7400AYRWZ 1-Channel Second-Order Isolated Sigma-Delta Modulator

Shenzhen Mingjiada Electronics Co., Ltd., as a globally renowned distributor of electronic components, supplies ADI's high-performance AD7400AYRWZ isolated Σ-Δ modulator. This 16-bit modulator plays a crucial role in industrial motor control, sensing detection, and data analysis systems, owing to its exceptional isolation performance and precise data conversion capabilities. The AD7400AYRWZ operates from a 5V supply, supporting differential input signals of ±200mV (±320mV full-scale) without requiring external sample-and-hold circuitry. With appropriate digital filtering, the original high-precision information can be reconstructed from its 10MHz output data stream.

【Product Overview】

The AD7400AYRWZ distinguishes itself among analogue-to-digital converters through its exceptional performance metrics. Employing Sigma-Delta (Σ-Δ) modulation technology, it delivers outstanding noise performance and linearity.

The AD7400AYRWZ features 16-bit resolution and a 10 MSPS sampling rate. At 16-bit resolution, its integral non-linearity (INL) is typically only ±2 LSB, ensuring high-precision conversion.

The AD7400AYRWZ integrates on-chip digital isolation based on ADI's iCoupler® technology, combining high-speed CMOS process with monolithic air-core transformer technology. This design delivers performance characteristics superior to traditional optocouplers.

The AD7400AYRWZ also exhibits low power consumption, typically drawing only 15.5mA at a 5.5V supply voltage. Its wide operating temperature range, spanning -40°C to +125°C, makes it suitable for applications in diverse harsh environments.

【Internal Architecture and Operating Principle】

The AD7400AYRWZ is a second-order Σ-Δ modulator, centred around a highly integrated analogue modulator that continuously samples the input signal.

The analogue input signal is converted by the modulator into a high-speed 1-bit data stream with a data rate up to 10MHz. This data stream traverses the digital isolation barrier, achieving electrical isolation between input and output.

The AD7400AYRWZ incorporates an on-chip reference voltage source, simplifying system design and reducing external component requirements. The digital interface section can be powered by either a 5V or 3V supply (VDD2), offering design flexibility.

The Σ-Δ architecture achieves high-resolution conversion through oversampling and noise shaping techniques. The analogue signal is sampled at high speed, quantisation noise is pushed into the high-frequency region, and subsequently filtered out by a digital filter, yielding a high-precision digital output.

【Key Technical Specifications】

The technical specifications of the AD7400AYRWZ demonstrate its high performance and reliability:

Resolution: 16 bits (no missing codes)

Sampling Rate: 10 MSPS (million samples per second)

Analogue Input Range: ±250mV (differential input)

Supply Voltage: Single supply 4.5V to 5.5V

Power Consumption: Typical 15.5mA (at 5.5V), approximately 95mW

Interface: Serial interface

Isolation characteristics: Integrated on-chip digital isolator compliant with safety and regulatory certifications including UL 1577, CSA, and VDE V 0884-10, with isolation withstand voltage of 5000V rms/min

Operating temperature range: -40°C to +125°C

Package: 16-pin SOIC wide-body package

The AD7400AYRWZ offers exceptional DC accuracy with typical integral non-linearity (INL) of ±2 LSB and extremely low offset drift, typically 1.5μV/°C. Its differential input structure effectively suppresses common-mode interference, enhancing signal integrity in noisy industrial environments.

The AD7400AYRWZ also boasts comprehensive safety and regulatory certifications, including UL certification (5000V rms for 1 minute, compliant with UL 1577), CSA Component Acceptance Notice #5A, and VDE Certificate of Conformity DIN V VDE V 0884-10 (VDE V 0884-10).

【Application Areas】

The AD7400AYRWZ is an ideal choice for numerous demanding applications due to its high precision, isolation characteristics, and robust immunity to interference:

Industrial Automation

Within industrial automation systems, the AD7400AYRWZ facilitates precision sensor data acquisition, such as the digital processing of pressure, temperature, and flow signals. Its high accuracy and isolation ensure reliable operation in harsh industrial environments.

Motor Control

The AD7400AYRWZ is suitable for AC motor control systems, particularly where high-precision current measurement is required. It accurately measures motor phase currents, providing critical data for efficient motor control.

Medical Equipment

Within medical equipment, the AD7400AYRWZ modulator is suitable for biomedical signal monitoring applications such as electrocardiograms (ECG) and electroencephalograms (EEG). Its high resolution and isolation capability meet the stringent safety and accuracy requirements of medical devices.

Test and Measurement

The AD7400AYRWZ is also extensively employed in high-precision data acquisition systems, such as portable instruments and environmental monitoring systems. In these applications, it can replace traditional ADC plus optical isolator solutions, simplifying system design.

Sensing and Precision Instruments

The AD7400AYRWZ is utilised for signal digitisation in data acquisition systems, precision sensors (such as pressure, temperature, and flow sensors), and test and measurement equipment.