The AD7712AAR is a complete analog front end for weigh scale or pressure transducer applications from Analog Devices. It's a high-resolution, sigma-delta ADC designed to interface directly with a transducer. It contains a programmable gain amplifier (PGA), an on-chip digital filter, and a calibration microcontroller interface. The ADC offers excellent noise performance and linearity.

Applications

• Weigh Scales
• Pressure Transducers
• Industrial Process Control
• Data Acquisition Systems
• Strain Gauge Measurements

Features

• High Resolution (Typically 24-bit)
• Sigma-Delta Architecture
• Programmable Gain Amplifier (PGA)
• On-Chip Digital Filter
• Low Noise
• Low Power Consumption
• 3-Wire Serial Interface
• Calibration Microcontroller Interface

Benefits

• High accuracy ensures precise measurement in weigh scale and pressure transducer applications.
• Low noise enables the detection of small changes in input signals.
• PGA allows direct interface to low-level transducer signals.
• Digital filtering reduces the need for external filtering components.
• Calibration interface simplifies system calibration.
• Low power consumption is suitable for battery-powered applications.

Additional Details

The AD7712AAR operates from a single supply. The PGA allows the ADC to handle a wide range of input signals. The digital filter provides excellent noise rejection. The 3-wire serial interface simplifies communication with microcontrollers. The ADC's performance is optimized for low-frequency applications, such as weigh scales and pressure transducers. It typically requires an external voltage reference. Operating temperature ranges are usually industrial grade. Careful layout and grounding are crucial for achieving the ADC's specified noise performance. The calibration microcontroller interface allows for easy system calibration and compensation for transducer errors.