AD7730BRU-REEL7

Overview

The AD7730BRU-REEL7 is a complete analog front end for weigh-scale and pressure measurement applications, manufactured by Analog Devices Inc. It features a 24-bit resolution with no missing codes and accepts low-level signals directly from transducers. The device includes two buffered differential programmable gain inputs, an on-chip 6-bit DAC for offset removal, and a serial interface compatible with microcontrollers. Operating from a single +5 V supply, it offers input ranges from ±10 mV to ±80 mV and achieves a peak-to-peak resolution of 230,000 counts.

Feature Summary

• 24-bit Sigma-Delta ADC with 230,000 counts peak-to-peak resolution
• Two-channel buffered differential programmable gain front end
• On-chip 6-bit DAC for TARE/offset removal
• Serial interface compatible with SPI and DSP systems

Applications

• Weigh scales
• Pressure measurement

Procurement Notes

Verify the package type matches the specific suffix; the BRU variant indicates a 24-lead SOIC package. Confirm the REEL7 designation corresponds to the required tape and reel quantity for manufacturing integration. Ensure the operating temperature range aligns with industrial specifications (-40°C to +85°C). Cross-reference the revision level with the latest datasheet to confirm pinout and electrical parameter consistency.

Selection Notes

Select this component when high precision is required for bridge transducer signals. The AD7730 supports both unipolar (0 mV to +80 mV) and bipolar (±10 mV to ±80 mV) input ranges. Consider the internal chopping mode if low drift performance is critical, as it reduces offset drift to less than 5 nV/°C. Ensure the system clock frequency meets the minimum requirement of 1 MHz for specified performance.

Part Context

This part belongs to the AD7730 family of Bridge Transducer ADCs. It is designed specifically for applications requiring direct connection to low-level sensors without external amplification. The device integrates the modulator, programmable gain amplifier, and digital filter into a single chip, simplifying the design of high-accuracy measurement systems compared to discrete solutions.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.