AD7782BRU-REEL

Overview

The AD7782BRU-REEL is a read-only, pin-configured 24-bit sigma-delta analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It features two fully differential analog input channels with an on-chip programmable gain amplifier (PGA). The device operates from a single 3 V or 5 V supply and achieves a fixed output update rate of 19.79 Hz via a 32.768 kHz crystal oscillator. Key electrical specifications include a maximum integral nonlinearity of ±10 ppm of full-scale range, typical offset error drift of ±10 nV/°C, and power dissipation of 3.9 mW at 3 V. It provides simultaneous 50 Hz and 60 Hz rejection and supports SPI, QSPI, Microwire, and DSP-compatible serial interfaces.

Feature Summary

• Pin-configurable architecture eliminates the need for programmable registers, allowing direct hardware selection of input channels and voltage ranges.
• Integrated digital filter provides simultaneous rejection of 50 Hz and 60 Hz line frequencies to minimize noise interference.
• On-chip rail-rail input buffer and programmable gain amplifier accommodate high source impedances and support dual bipolar input ranges.
• Read-only digital interface simplifies system design by removing register programming requirements while supporting master and slave operation modes.

Applications

• Sensor measurement systems
• Industrial process control instrumentation
• Temperature measurement applications
• Pressure measurements
• Weigh scales

Procurement Notes

Verify component authenticity through authorized distribution channels due to potential counterfeit risks. Confirm package integrity upon receipt, as the TSSOP-16 form factor requires careful handling during inspection. Ensure that the ordering suffix matches the required reel packaging configuration for automated assembly processes. Cross-reference the manufacturer part number against official documentation to validate revision levels before integration into production workflows.

Selection Notes

Select this component when designing low-frequency measurement circuits requiring high resolution without complex digital configuration. The fixed 19.79 Hz update rate suits applications needing precise 50 Hz and 60 Hz noise rejection. Consider the external reference requirement and crystal oscillator dependencies during schematic design. Evaluate the pin-configurable nature against systems requiring dynamic channel switching, as software reconfiguration is not supported.

Part Context

This device belongs to the AD778x family of precision analog front ends designed for low-frequency signal conditioning. It shares architectural similarities with other members like the AD7783 but differs in channel count and integrated current sources. The AD7782 specifically targets applications requiring two differential inputs with hardware-defined configurations, distinguishing it from programmable counterparts in the broader data converter portfolio.

Replacement Considerations

Public confirmed substitute part numbers: AD7782BRUZ, AD7782BRUZ-REEL7.