AD7730BR-REEL7

Overview

The AD7730BR-REEL7 is a complete analog front end for weigh-scale and pressure measurement applications, manufactured by Analog Devices Inc. It features a 24-bit Sigma-Delta ADC with two buffered differential programmable gain inputs. The device accepts low-level signals directly from transducers and outputs serial digital words via a three-wire interface compatible with microcontrollers. Key specifications include an offset drift of 5 nV/°C, gain drift of 2 ppm/°C, and a peak-to-peak resolution of 230,000 counts. It operates on a single +5 V supply and includes an on-chip 6-bit DAC for offset removal.

Feature Summary

• 24-bit resolution with 230,000 counts peak-to-peak
• Two-channel buffered differential programmable gain front end
• On-chip 6-bit DAC for TARE voltage removal
• Three-wire serial interface compatible with SPI/DSP

Applications

• Weigh scales
• Pressure measurement

Procurement Notes

Verify the specific suffix 'BR' indicates the industrial temperature range (-40°C to +85°C) as defined in the datasheet. Confirm the package type matches the required PCB footprint, as the AD7730 is available in DIP, SOIC, and TSSOP packages. Ensure the reel quantity aligns with production needs.

Selection Notes

Select this component for high-precision applications requiring low drift and high resolution. Consider the input voltage ranges (±10 mV to ±80 mV) and the need for external reference voltages between 1 V and 5 V. Evaluate power consumption requirements, noting the standby mode current is typically 10 μA.

Part Context

The AD7730 is part of Analog Devices' bridge transducer ADC family. It is designed specifically for interfacing with low-level sensor signals. The 'BR' suffix denotes the commercial/industrial grade version, distinct from the AD7730L which may have different clock frequency specifications.

Replacement Considerations

Check pin compatibility if substituting with other AD773x variants. Verify that the replacement supports the required input ranges and serial interface timing. Ensure the thermal performance meets the application's operating temperature constraints.