AD7823YR

Overview

The AD7823YR is an 8-bit successive approximation analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates from a single supply voltage ranging from 2.7 V to 5.5 V and features a typical conversion time of 4 µs. The device incorporates inherent track-and-hold functionality with a pseudo-differential input structure. It utilizes a high-speed serial interface compatible with standard microcontrollers, requiring no external logic. Key performance metrics include a signal-to-noise ratio of 48 dB minimum, differential nonlinearity of ±0.5 LSB maximum, and integral nonlinearity of ±0.5 LSB maximum. The component is specified for operation across a temperature range of –40°C to +125°C and is housed in an 8-lead SOIC package.

Feature Summary

• Inherent track-and-hold functionality eliminates the need for external sampling capacitors or buffers.
• Automatic power-down mode significantly reduces average power consumption at lower throughput rates.
• Microcontroller-compatible serial interface allows direct connection without additional glue logic.
• Pseudo-differential input architecture enables offset cancellation within the system.

Applications

• Battery-powered test equipment requiring low power consumption.
• Hand-held portable applications needing space-saving ADC solutions.
• Battery-powered communications systems.

Procurement Notes

Verify the specific ordering suffix 'YR' corresponds to the SOIC-8 package variant when sourcing components. Confirm that the required temperature grade matches the Y version specifications (-40°C to +125°C). Ensure that the design accounts for the external reference requirements if VREF is not tied to VDD. Check for end-of-life status or obsolescence notices from the manufacturer prior to finalizing procurement plans.

Selection Notes

Select this component when an 8-bit resolution is sufficient for the application's accuracy requirements. Consider the automatic power-down feature if battery life is critical and throughput rates are variable. Ensure the source impedance driving the VIN+ pin is low enough to meet the 100 ns acquisition time specification. Verify that the microcontroller serial interface timing aligns with the SCLK and CONVST requirements defined in the datasheet.

Part Context

The AD7823 belongs to the AD7823 series of 8-bit ADCs from Analog Devices. It serves as a compact solution for applications requiring moderate speed and low power. The part is available in multiple packages including DIP, SOIC, and microSOIC. It offers a drop-in upgrade path to higher resolution devices like the AD7810 within the same family footprint.

Replacement Considerations

The AD7810 is documented as a drop-in upgrade option offering 10-bit resolution while maintaining similar package constraints. Verify pin compatibility and software adjustments for increased resolution before substituting.