AD7730LBRUZ

Overview

The AD7730LBRUZ is a 24-bit, two-channel Sigma-Delta analog-to-digital converter (ADC) designed for weigh scale and pressure measurement applications. It operates from a single +5 V supply and features a proprietary programmable gain front end with input ranges of ±10 mV to ±80 mV. The device integrates a 6-bit DAC for offset removal, on-chip clock generation, and a serial interface compatible 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 is housed in a 24-lead TSSOP package.

Feature Summary

• 24-bit resolution with no missing codes and 230,000 peak-to-peak counts
• Two buffered differential inputs with programmable gain amplifier (PGA)
• Integrated 6-bit DAC for tare voltage removal
• Low drift specifications: 5 nV/°C offset drift and 2 ppm/°C gain drift

Applications

• Weigh scales
• Pressure measurement

Procurement Notes

Verify the component revision against the datasheet specification sheet. Confirm that the operating temperature range meets the industrial requirement of -40°C to +85°C. Ensure the master clock frequency matches the AD7730L requirement of 2.4576 MHz, as this differs from the standard AD7730. Check for ESD sensitivity precautions during handling.

Selection Notes

Select the AD7730LBRUZ when a lower master clock frequency of 2.4576 MHz is required compared to the standard AD7730. This part is suitable for applications requiring high precision with low drift, such as industrial weighing systems. Ensure the design accommodates the 24-lead TSSOP package dimensions and provides adequate power supply decoupling for the AVDD and DVDD pins.

Part Context

The AD7730L is a variant of the AD7730 series, distinguished primarily by its specified master clock input frequency of 2.4576 MHz, whereas the standard AD7730 uses 4.9152 MHz. Both parts share identical pinouts, functional blocks, and electrical characteristics except for the clock specification. The BRUZ suffix indicates a lead-free, RoHS-compliant 24-lead TSSOP package.

Replacement Considerations

The standard AD7730BRUZ can be used as a replacement if the system clock can support 4.9152 MHz or if the clock divider settings are adjusted accordingly. Verify that any substitute maintains the 24-lead TSSOP footprint and the same electrical performance regarding drift and linearity.