AD7730LBRU-REEL

Overview

The AD7730LBRU-REEL is a 24-bit sigma-delta analog-to-digital converter (ADC) designed for weigh scale and pressure measurement applications. It features two buffered differential programmable gain inputs, supporting unipolar ranges of 0 mV to +80 mV and bipolar ranges of ±10 mV to ±80 mV. The device operates from a single +5 V supply with a specified master clock frequency of 2.4576 MHz. Key performance metrics include an offset drift of 5 nV/°C, a gain drift of 2 ppm/°C, and integral nonlinearity of 18 ppm of full-scale range. It incorporates an on-chip 6-bit DAC for offset removal and supports serial interface communication.

Feature Summary

• 24-bit resolution with 230,000 peak-to-peak counts
• Low drift specifications: 5 nV/°C offset drift and 2 ppm/°C gain drift
• Two-channel programmable gain front end with buffered differential inputs
• On-chip 6-bit DAC for TARE voltage removal

Applications

• Weigh scales
• Pressure measurement

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current product lifecycle status. Confirm that the package type matches the required board layout, as the AD7730L series is available in SOIC and TSSOP packages. Ensure the master clock input requirements align with the 2.4576 MHz specification unique to the L version.

Selection Notes

Select the AD7730L over the standard AD7730 when a lower master clock frequency of 2.4576 MHz is required. Verify that the application utilizes the specified unipolar or bipolar input ranges compatible with the programmable gain amplifier. Check if the industrial temperature range of -40°C to +85°C meets the operational environment requirements.

Part Context

The AD7730L is part of the AD7730 family of bridge transducer ADCs. While functionally similar to the AD7730, the L variant is specifically characterized for operation with a 2.4576 MHz master clock. It shares the same core architecture, including the sigma-delta modulator and digital filter, but differs in timing specifications and certain electrical characteristics defined in the datasheet appendices.

Replacement Considerations

The standard AD7730 is a related component within the same family. However, substitution requires verification of clock frequency compatibility, as the AD7730 specifies a 4.9152 MHz master clock. Direct replacement may necessitate adjustments to the system clock generation circuitry.