AD9225ARSZ

Overview

The AD9225ARSZ is a monolithic, single-supply, 12-bit, 25 MSPS analog-to-digital converter featuring an on-chip sample-and-hold amplifier and voltage reference. It utilizes a multistage differential pipelined architecture with output error correction logic to ensure no missing codes over the full operating temperature range. The device operates on a single 5 V analog supply (AVDD) and a separate digital driver supply (DRVDD) ranging from 2.85 V to 5.25 V, allowing compatibility with 3 V or 5 V logic families. Key performance metrics include a Signal-to-Noise Ratio of 71 dB, Spurious-Free Dynamic Range of –85 dB, and low power dissipation of 280 mW.

Feature Summary

• Multistage differential pipelined architecture with digital error correction for high accuracy
• Integrated wideband sample-and-hold amplifier supporting flexible single-ended or differential inputs
• On-board programmable voltage reference with options for external reference input
• Out-of-range indicator bit for overflow detection alongside straight binary output data

Applications

• Communications systems requiring high-speed signal digitization
• Imaging applications utilizing the versatile input structure
• Medical ultrasound equipment benefiting from low power consumption

Procurement Notes

Verify the specific package variant upon ordering, as the AD9225 series includes both SSOP and SOIC footprints. Confirm that the 'ARSZ' suffix corresponds to the 28-lead SSOP package with RoHS compliance. Ensure the design accounts for the separate AVDD and DRVDD power domains to maintain signal integrity and logic compatibility.

Selection Notes

Select this component when a single-supply solution is required for 12-bit resolution at 25 MSPS. Consider the internal reference capabilities if system cost and board space are constraints; otherwise, utilize the external reference pin for enhanced DC accuracy. Evaluate the input drive requirements carefully due to the dynamic switched-capacitor nature of the SHA input stage.

Part Context

The AD9225 is part of a family of monolithic ADCs fabricated on a cost-effective CMOS process. It shares pin compatibility with the AD9220, AD9221, AD9223, and AD9224 models, facilitating design upgrades or changes in resolution and speed within the same footprint. This integration allows for reduced system complexity compared to discrete bipolar implementations.

Replacement Considerations

The AD9225ARZ serves as a direct replacement offering the same electrical specifications but housed in a 28-lead SOIC package instead of the SSOP format. Designers must verify PCB footprint compatibility when substituting between these package types.