AD9221ARZ

Overview

The AD9221ARZ is a monolithic 12-bit analog-to-digital converter manufactured by Analog Devices Inc. It features a maximum conversion rate of 1.5 MSPS and operates on a single 5 V analog supply with a digital supply range of 2.7 V to 5.25 V. The device utilizes a multistage differential pipelined architecture with digital output error correction logic, ensuring no missing codes over the full operating temperature range. Key electrical specifications include a typical Signal-to-Noise Ratio (SNR) of 70.2 dB, a Spurious-Free Dynamic Range (SFDR) of 86.0 dB, and an Effective Number of Bits (ENOB) of 11.3 bits. Integral Nonlinearity (INL) is typically ±0.4 LSB, while Differential Nonlinearity (DNL) is typically ±0.3 LSB. The input referred noise is 0.09 LSB rms at a 2.5 V reference. Power consumption is typically 59 mW. The component is housed in a 28-lead SOIC package.

Feature Summary

• Multistage differential pipelined architecture with digital output error correction logic for guaranteed 12-bit accuracy.
• Integrated high-performance sample-and-hold amplifier and programmable voltage reference supporting internal or external references.
• Flexible analog input structure allowing configuration for both single-ended and differential interfaces.
• Straight binary output data format with an out-of-range indicator signal.

Applications

• Imaging systems
• Communications systems employing Direct-IF down conversion
• Medical equipment
• Data-acquisition systems

Procurement Notes

Verify the specific ordering suffix 'ARZ' against current manufacturer documentation to confirm package type and RoHS compliance status. Confirm availability as the product may be subject to discontinuation notices. Ensure that the selected variant matches the required sampling rate and power dissipation constraints for the target application environment.

Selection Notes

Select the AD9221ARZ when a 1.5 MSPS sampling rate is sufficient for the application requirements. Consider the AD9223 or AD9220 variants if higher sampling rates of 3.0 MSPS or 10.0 MSPS are needed, noting the associated increase in power consumption. Evaluate the need for external versus internal voltage references based on required temperature drift performance and DC accuracy specifications.

Part Context

The AD9221ARZ belongs to the AD9221/AD9223/AD9220 product family from Analog Devices. These devices share identical pinouts, interface options, and packages, providing a scalable solution for system designers. The family allows for upward or downward selection based on dynamic performance, sampling rate, and power consumption trade-offs while maintaining compatibility across the series.

Replacement Considerations

The AD9223ARSZ and AD9220ARSZ are pin-compatible members of the same family offering higher sampling rates. Verify if the increased bandwidth and power consumption of these alternatives align with the design requirements before substitution.

FAQ

What is the pipeline latency of the AD9221ARZ?

The AD9221ARZ has a fixed pipeline delay or latency of three clock cycles.

How does the AD9221ARZ handle input polarity inversion?

Reversing the connections to the VINA and VINB pins results in a polarity inversion of the output data.

What is the typical aperture jitter specification?

The typical aperture jitter for the AD9221ARZ is 4 ps rms.