AD7790BRMZ-REEL

Overview

The AD7790BRMZ-REEL 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, eliminating the need for external clock sources. 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 is housed in a 10-lead MSOP package and supports 3-wire serial, SPI, QSPI, Microwire, and DSP compatible interfaces.

Feature Summary

• Integrated rail-to-rail input buffer allows connection to high source impedances without contributing gain errors.
• Internal clock oscillator provides self-contained timing, removing the requirement for external clock generation circuitry.
• Digital programmable gain amplifier enables flexible signal conditioning for varying input voltage ranges.
• Software-selectable output data rates optimize the trade-off between measurement speed and noise performance.

Applications

• Smart transmitters
• Battery-powered portable instrumentation
• Sensor measurement systems
• Temperature and pressure measurement
• Weigh scales

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm packaging type and reel specifications. Confirm that the component meets all required environmental and electrical standards for the intended application before finalizing procurement decisions.

Selection Notes

Select this component for applications requiring high resolution at low frequencies with minimal power consumption. Ensure the system design accommodates the differential input requirements and provides a stable external reference voltage within the specified range for optimal accuracy.

Part Context

This part belongs to the AD7790 series of low-power ADCs manufactured by Analog Devices Inc. It is designed specifically for complete analog front-end solutions in low-frequency measurement applications, integrating the modulator, buffer, PGA, and digital filtering into a single compact package.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing system designs if considering alternative components from other manufacturers or different product lines.

FAQ

Does the AD7790 require an external clock source?

No, the AD7790 contains an internal clock oscillator, so no external clock source is required for operation.

What is the maximum power consumption in normal mode?

The maximum power supply current in normal mode is 75 µA, depending on the supply voltage and operating configuration.

Can the analog input be unbuffered to reduce power consumption?

Yes, the ADC can be configured for unbuffered mode via the Mode Register, which lowers power consumption but limits the allowable source impedance.