AD7823YR-REEL

Overview

The AD7823YR-REEL is an 8-bit successive approximation analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates on a single supply voltage ranging from 2.7 V to 5.5 V and features a pseudo-differential analog input with inherent track-and-hold functionality. The device utilizes a high-speed serial interface compatible with standard microcontrollers, requiring no external logic for connection. Key electrical specifications include a maximum throughput rate of 133 kSPS, a typical conversion time of 4 µs, and a signal-to-noise ratio of 48 dB. It supports automatic power-down modes to minimize energy consumption in battery-powered applications.

Feature Summary

• Inherent track-and-hold functionality eliminates the need for external sampling capacitors.
• Microcontroller-compatible serial interface allows direct connection without additional glue logic.
• Automatic power-down mode significantly reduces average power consumption at lower throughput rates.

Applications

• Battery-powered test equipment requiring low-power analog-to-digital conversion.
• Portable hand-held devices necessitating space-saving ADC solutions.
• Battery-powered communications systems utilizing 8-bit accuracy requirements.

Procurement Notes

Verify that the ordering suffix REEL indicates tape-and-reel packaging rather than tube packaging when sourcing this specific variant. Confirm the Y version linearity error specification matches system requirements. Ensure the SOIC-8 package footprint aligns with the printed circuit board design constraints before finalizing procurement orders.

Selection Notes

Select this component when an 8-bit resolution with a 4 µs conversion time is sufficient for the application. Consider the AD7823 for designs requiring a pseudo-differential input structure to reject common-mode offsets. Evaluate the automatic power-down feature if the system operates at throughput rates below 50 kSPS to optimize battery life.

Part Context

The AD7823 belongs to the Analog Devices AD7823 series of low-power, high-speed ADCs. It serves as a compact solution for embedded systems where board space is limited. The part is functionally similar to the AD7810 but offers 8-bit resolution instead of 10 bits. It is designed to replace older parallel ADCs in modern microcontroller-based architectures.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing PCB footprints and software drivers if considering alternative manufacturers' 8-bit SAR ADCs with serial interfaces.

FAQ

How does the AD7823 achieve low power consumption?

The AD7823 achieves low power consumption through an automatic power-down mode. In this mode, the device powers down immediately after a conversion completes and wakes up only when a new conversion is initiated via the CONVST pin.

What is the purpose of the pseudo-differential input?

The pseudo-differential input allows the removal of system offsets. By applying an offset voltage to the VIN– pin, the input span can be shifted, which is useful for measuring signals that do not start from ground potential.

Can the AD7823 operate without an external reference voltage?

Yes, the AD7823 can operate without an external reference. The VREF pin can be connected directly to the VDD supply pin, allowing the analog input range to span from 0 V to VDD.