AD7730BRZ-REEL

Overview

The AD7730BRZ-REEL is a CMOS, 24-bit Sigma-Delta analog-to-digital converter (ADC) designed for bridge transducer applications. It operates from a single +5 V supply and features two buffered differential programmable gain inputs with ranges of ±10 mV to ±80 mV. The device integrates a 6-bit DAC for offset removal and provides serial interface compatibility with microcontrollers. Key performance metrics include an integral nonlinearity of 18 ppm, offset drift of 5 nV/°C, and gain drift of 2 ppm/°C. It supports update rates up to 1.2 kS/s 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 TARE voltage removal
• Low drift specifications: 5 nV/°C offset, 2 ppm/°C gain

Applications

• Weigh scales
• Pressure measurement systems

Procurement Notes

Verify the B version designation indicates industrial temperature range operation (-40°C to +85°C). Confirm the REEL suffix corresponds to tape-and-reel packaging containing 1000 units per factory pack. Ensure external reference voltages are within the specified 1 V to 5 V range for proper functionality.

Selection Notes

Select this component for high-precision bridge sensor interfaces requiring low drift over time and temperature. The AD7730 is suitable where input spans are limited to ±10 mV–±80 mV. For applications requiring higher throughput or different channel counts, consider the AD7731 or AD7734 families. Verify that the required master clock frequency matches the 4.9152 MHz specification for optimal performance.

Part Context

The AD7730 belongs to Analog Devices' dedicated bridge transducer ADC family. It is functionally similar to the AD7730L but differs in specific electrical parameters such as clock frequency requirements and power consumption profiles. The BRZ suffix denotes a lead-free, RoHS-compliant SOIC-24 package variant.

Replacement Considerations

The AD7730L serves as a functional alternative within the same series, though it requires a different master clock frequency (2.4576 MHz vs. 4.9152 MHz) and exhibits distinct power characteristics. Direct pin-compatible substitution requires verification of clock source compatibility and power budget constraints.