AD7730BRUZ

Overview

The AD7730BRUZ is a complete analog front end for weigh-scale and pressure measurement applications, housed in a 24-lead TSSOP package. It features a Sigma-Delta architecture with 24-bit resolution (no missing codes) and two buffered differential programmable gain inputs. The device operates from a single +5 V analog supply and a 2.7 V to 5.25 V digital supply. Key static performance parameters include an offset drift of 5 nV/°C, gain drift of 2 ppm/°C, and integral nonlinearity of 18 ppm of FSR. It supports input ranges from ±10 mV to ±80 mV and offers update rates up to 1.2 kS/s.

Feature Summary

• Two-channel programmable gain front end with buffered differential inputs
• On-chip 6-bit DAC for offset and tare removal
• Serial interface compatible with SPI and DSP protocols
• Internal clock generation or external master clock support

Applications

• Weigh scales
• Pressure measurement

Procurement Notes

Verify the specific suffix 'BRUZ' corresponds to the industrial temperature range (-40°C to +85°C) and TSSOP-24 packaging as defined in the Analog Devices datasheet. Confirm that the component matches the B-version specifications regarding drift and noise performance. Ensure compatibility with the required reference voltage configuration (2.5 V or 5 V) during integration.

Selection Notes

Select this component when high precision is required for bridge transducers. The AD7730 supports both AC and DC excitation modes. Consider the FASTStep mode for applications requiring rapid settling times after input changes. Verify that the system power budget accommodates the maximum power dissipation of 65 mW in normal mode for standard input ranges.

Part Context

The AD7730 is part of the AD7730 family, which also includes the AD7730L variant. The AD7730L differs primarily in its specified master clock frequency (2.4576 MHz vs. 4.9152 MHz for the AD7730). Both variants share similar functional block diagrams and pin configurations but have distinct electrical specifications detailed in their respective data sheets.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify pinout and specification compatibility if considering alternative ADCs from other manufacturers.