AD7789BRMZ

Overview

The AD7789BRMZ is a low-power, 24-bit Sigma-Delta analog-to-digital converter (ADC) from Analog Devices. It features one differential input and operates on a single supply voltage ranging from 2.5 V to 5.25 V. The device incorporates an internal clock oscillator and provides an output update rate of 16.6 Hz, enabling simultaneous 50 Hz and 60 Hz rejection. Power consumption is 75 µA maximum in normal mode and 1 µA maximum in power-down mode. It utilizes a 3-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP standards. The component is housed in a 10-lead MSOP package.

Feature Summary

• Integrated Sigma-Delta modulator with digital filtering for high-resolution measurements
• Internal clock oscillator eliminates the need for external clock sources
• Simultaneous 50 Hz and 60 Hz line frequency rejection at 16.6 Hz data rate
• Low power operation suitable for battery-powered applications

Applications

• Smart transmitters
• Battery-powered portable instrumentation
• Weigh scales
• Temperature measurement systems
• Pressure measurement sensors

Procurement Notes

Verify the specific ordering suffix 'BRMZ' against the manufacturer's current documentation to confirm the package type and temperature grade. Confirm availability status as distribution channels may indicate discontinuation or limited stock. Ensure the required reference voltage range aligns with system design constraints before procurement.

Selection Notes

Select this component when high resolution and low noise are critical for low-frequency signal acquisition. The internal oscillator simplifies board layout by removing external clock requirements. Consider the 16.6 Hz update rate limitation if higher speed is needed. Verify that the differential input configuration matches the sensor interface requirements.

Part Context

The AD7789 is part of the AD7788/AD7789 family of low-power, low-noise analog front ends designed for precision measurement applications. The AD7789 offers 24-bit resolution, while the AD7788 provides 16-bit resolution. Both share similar pinouts and functional characteristics, differing primarily in resolution and nonlinearity specifications.

Replacement Considerations

The AD7788 is a related component within the same family offering 16-bit resolution. Direct substitution requires verifying if the reduced resolution meets application accuracy requirements. Other members of the low-power ADC family may offer different channel counts or interfaces.