AD7790BRMZ

Overview

The AD7790BRMZ is a low-power, 16-bit buffered Sigma-Delta analog-to-digital converter (ADC) from Analog Devices Inc. It operates on a single supply voltage ranging from 2.5 V to 5.25 V and features an internal clock oscillator. The device includes a programmable gain amplifier with selectable gains of 1, 2, 4, and 8, and supports software-programmable output data rates between 9.5 Hz and 120 Hz. At the lowest update rate of 9.5 Hz, it achieves an RMS noise of 1.1 μV. The component utilizes a 3-wire serial interface compatible with SPI, QSPI, Microwire, and DSP standards. It is housed in a 10-lead MSOP package and functions within a temperature range of –40°C to +105°C.

Feature Summary

• Integrated rail-to-rail input buffer allows for high source impedance applications without contributing gain errors.
• Internal clock oscillator eliminates the need for external clock sources, simplifying system design.
• Digital programmable gain amplifier provides flexible signal conditioning for varying input ranges.
• Simultaneous 50 Hz and 60 Hz line frequency rejection optimizes performance in noisy environments.

Applications

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

Procurement Notes

Verify the specific ordering suffix BRMZ corresponds to the MSOP-10 package and industrial temperature grade when sourcing components. Confirm that the manufacturer's documentation aligns with the required specifications for your application. Ensure compatibility with existing inventory management systems regarding part identification codes. Cross-reference datasheet revisions to confirm feature consistency across production batches.

Selection Notes

Select this component for low-frequency measurement applications requiring high resolution and low power consumption. The integrated buffer is suitable for sensors with high output impedance. Consider the available gain settings and update rates to match the specific noise and bandwidth requirements of the target sensor interface. Verify that the external reference voltage range meets the system's accuracy needs.

Part Context

The AD7790 belongs to a family of complete analog front ends designed for precision measurement. It integrates a Sigma-Delta modulator, digital filter, and PGA into a single chip. This integration reduces the component count and board space required for signal conditioning compared to discrete solutions. The device is optimized for applications where power efficiency and measurement accuracy are critical constraints.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the verified source material. Consult official manufacturer documentation for potential cross-references or updated product lines.