AD7783BRUZ

Overview

The AD7783BRUZ is a single-channel, 24-bit sigma-delta analog-to-digital converter (ADC) from Analog Devices. It features a fixed output update rate of 19.79 Hz and simultaneous 50 Hz and 60 Hz rejection. The device operates on a single 3 V or 5 V supply with typical power dissipation of 3.9 mW at 3 V. It includes two integrated 200 mA excitation current sources and a rail-to-rail input buffer with programmable gain amplifier (PGA). Input ranges are pin-configurable to ±160 mV or ±2.56 V. The digital interface supports master or slave modes via SPI, Microwire, QSPI, or DSP-compatible protocols.

Feature Summary

• Pin-configurable input range selection without programmable registers
• Integrated dual 200 mA excitation current sources for sensor biasing
• Read-only digital interface supporting multiple serial communication protocols
• On-chip PLL utilizing a 32.768 kHz crystal for stable clock generation

Applications

• Weigh scales
• Industrial process control
• Temperature measurement
• Pressure measurement
• Portable instrumentation

Procurement Notes

Verify the specific package variant when ordering, as the BRU suffix denotes tube packaging while REEL variants indicate tape and reel options. Confirm RoHS compliance status, indicated by the Z suffix in related part numbers, against project requirements. Ensure the selected revision matches the design specifications, as the datasheet indicates Rev C updates regarding timing diagrams and ordering guides.

Selection Notes

Select this component for low-frequency applications requiring high resolution and simple hardware configuration. The fixed 19.79 Hz data rate provides inherent line frequency rejection, simplifying filter design. Consider the integrated current sources if driving resistive sensors like RTDs or strain gauges, which eliminates external biasing components. Verify that the required input voltage range aligns with the available pin-configurable options of ±160 mV or ±2.56 V.

Part Context

The AD7783 belongs to the AD778x family of precision ADCs. It is functionally similar to the AD7782 but differs by including integrated excitation current sources and having only one differential input channel compared to the AD7782's two channels. Both devices share the same read-only interface architecture and sigma-delta conversion principles designed for industrial sensor interfaces.

Replacement Considerations

The AD7782 is a related part within the same family but lacks the integrated excitation current sources and offers two differential input channels instead of one. Direct substitution requires verifying if the additional channel or missing current sources impact the specific circuit design.