AD7730BRZ

Overview

The AD7730BRZ is a CMOS, 24-bit Sigma-Delta analog-to-digital converter (ADC) designed for bridge transducer applications. It features two buffered differential programmable gain inputs and operates from a single +5 V supply. The device accepts unipolar ranges of 0 mV to +10/20/40/80 mV and bipolar ranges of ±10/20/40/80 mV. Key static performance metrics include an integral nonlinearity of 18 ppm of full-scale range, offset drift of 5 nV/°C, and gain drift of 2 ppm/°C. It achieves a peak-to-peak resolution of 230,000 counts with line frequency rejection exceeding 150 dB.

Feature Summary

• 24-bit resolution with 230,000 peak-to-peak counts
• Two-channel buffered differential programmable gain front end
• On-chip 6-bit DAC for offset/TARE removal
• Programmable digital filter with FASTStep mode

Applications

• Weigh scales
• Pressure measurement

Procurement Notes

Verify the package type upon ordering, as the AD7730 series is available in 24-pin plastic DIP, SOIC, and TSSOP configurations. Confirm that the specific BRZ suffix corresponds to the required industrial temperature range (-40°C to +85°C). Ensure compatibility with the system's serial interface requirements, as the device supports three-wire operation compatible with microcontrollers and DSPs.

Selection Notes

Select the AD7730BRZ when high precision is required for low-level transducer signals. The device is suitable for applications requiring direct connection to bridge sensors without external amplification. Consider the on-chip DAC if tare voltage removal is needed. Verify that the system can provide the necessary master clock frequency, typically 4.9152 MHz, for specified performance.

Part Context

The AD7730BRZ belongs to the AD7730 family of bridge transducer ADCs manufactured by Analog Devices. It is part of a complete analog front-end solution for weigh-scale and pressure measurement systems. The 'B' suffix indicates the industrial temperature grade, while 'RZ' denotes the RoHS-compliant SOIC-24 package variant.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material.