AD7823YRMZ-REEL

Overview

The AD7823YRMZ-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 typical conversion time of 4 µs with a maximum throughput rate of 133 kSPS. The device incorporates inherent track-and-hold functionality and supports a pseudo-differential input configuration. It utilizes a high-speed serial interface compatible with standard microcontrollers, supporting SPI and I2C protocols. Key performance metrics include a signal-to-noise ratio of 48 dB minimum, differential nonlinearity of ±0.5 LSB, and integral nonlinearity of ±0.5 LSB. Power consumption varies significantly based on operation mode, reaching up to 17.5 mW in continuous sampling mode but dropping to as low as 5 µW in power-down mode.

Feature Summary

• Inherent track-and-hold functionality eliminates the need for external hold capacitors.
• Automatic power-down mode reduces average power consumption at lower throughput rates.
• Microcontroller-compatible serial interface requires no external logic for connection.
• Pseudo-differential input architecture allows for system offset removal.

Applications

• Battery-powered test equipment requiring 8-bit accuracy
• Hand-held portable applications needing space-saving ADC solutions
• Battery-powered communications systems

Procurement Notes

Verify the REEL suffix indicates tape-and-reel packaging rather than tube packaging when sourcing components. Confirm the Y version designation aligns with the specified linearity error and temperature range requirements for your specific design constraints. Ensure compatibility with the 8-lead microSOIC package dimensions during PCB layout planning.

Selection Notes

Select this component for designs prioritizing low power consumption in battery-operated environments. The automatic power-down feature makes it suitable for intermittent sampling applications where energy efficiency is critical. Consider the 8-bit resolution and 133 kSPS speed limits against your signal bandwidth requirements before finalizing the part choice.

Part Context

The AD7823 series represents a family of low-power, high-speed ADCs designed for space-constrained applications. The YRMZ variant specifically denotes the microSOIC package option within the AD7823 lineup. This family is often compared to higher-resolution counterparts like the AD7810 for upgrade paths while maintaining pin compatibility.

Replacement Considerations

The AD7810 is documented as a drop-in upgrade providing 10-bit resolution within the same package footprint. Verify electrical specifications and interface timing differences when substituting with other 8-bit SAR ADCs from different manufacturers.

FAQ

How does the automatic power-down mode function?

The device powers down automatically at the end of a conversion if the CONVST signal remains low. It wakes up upon the next rising edge of CONVST, significantly reducing power consumption at lower throughput rates.

What is the purpose of the pseudo-differential input?

The pseudo-differential input scheme allows the removal of system offsets. An offset can be applied to the VIN– pin to shift the input span, provided the reference voltage allows for the required headroom.

How is the serial interface synchronized?

The serial port is enabled by the rising edge of the CONVST signal. Data is shifted out on DOUT on subsequent SCLK rising edges, and the counter resets after eight clocks to ensure correct bit shifting.