AD7790BRM

Overview

The AD7790BRM 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. The device features an internal clock oscillator and a programmable gain amplifier with selectable gains of 1, 2, 4, and 8. It supports software-programmable output data rates between 9.5 Hz and 120 Hz. At the minimum update rate of 9.5 Hz, the RMS noise is specified at 1.1 µV. The component provides simultaneous 50 Hz and 60 Hz line frequency rejection and includes a VDD monitor channel. 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 direct interfacing with high source impedance sensors without contributing gain errors.
• Internal clock oscillator eliminates the need for external clock sources, simplifying system design.
• Digital programmable gain amplifier enables flexible signal conditioning for varying input voltage ranges.
• Low power consumption modes allow current reduction through internal clock frequency division.

Applications

• Smart transmitters
• Battery-powered portable instrumentation
• Precision sensor measurement systems
• Weigh scales

Procurement Notes

Verify the specific suffix 'BRM' against the manufacturer's official ordering guide to confirm package type and tape/reel specifications. Confirm that the component meets RoHS compliance requirements for your target market. Check for any end-of-life notices or obsolescence warnings associated with this specific part number variant before finalizing procurement plans.

Selection Notes

Select the AD7790BRM when a complete analog front end with integrated buffering and low noise performance is required for low-frequency measurements. Ensure the application benefits from the internal clock to reduce external component count. Verify that the 16-bit resolution and available update rates meet the system's accuracy and speed requirements. Consider the power supply voltage range compatibility with the system architecture.

Part Context

The AD7790 belongs to a family of low-power Sigma-Delta ADCs designed for precision measurement applications. It shares functional similarities with other members like the AD7791 and AD7792 but offers specific integration levels such as the buffered input stage. This particular model focuses on providing a complete solution for single-channel differential inputs with onboard signal conditioning capabilities.

Replacement Considerations

Consult the official datasheet for cross-reference information. Potential substitutes may include other models within the same product family, such as the AD7791 or AD7792, depending on whether additional channels or different resolution are needed. Verify pinout compatibility and register mapping before substitution.