AD9225ARZ

Overview

The AD9225ARZ 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 supply for analog circuits (AVDD) and supports digital driver supplies from 2.85 V to 5.25 V (DRVDD). Key performance metrics include a Signal-to-Noise Ratio of 71 dB, Spurious-Free Dynamic Range of –85 dB, and power dissipation of 280 mW. It is housed in a 28-lead SOIC package.

Feature Summary

• Monolithic integration of high-speed CMOS process with precision analog circuits and high-density logic.
• Flexible input structure supporting both single-ended and differential configurations via the wideband sample-and-hold amplifier.
• On-board programmable voltage reference allowing selection between internal 1 V or 2 V modes, or external reference input.
• Out-of-range indicator output bit to signal overflow conditions relative to the input range.

Applications

• Communications systems requiring high-speed data acquisition.
• Imaging applications utilizing multiplexed channels.
• Medical ultrasound equipment demanding precise analog-to-digital conversion.

Procurement Notes

Verify the specific ordering suffix 'ARZ' corresponds to the 28-lead SOIC package variant when sourcing components. Confirm that the manufacturer designation matches Analog Devices Inc. to ensure authenticity. Check RoHS compliance status against current regulatory requirements for the intended deployment region. Ensure the component meets the specified operating temperature range of -40°C to +85°C for your application environment.

Selection Notes

Select this component when a single-supply 12-bit resolution at 25 MSPS is required with low power consumption. Consider the flexible input span options (1 V or 2 V reference modes) to match source signal amplitudes. Evaluate the need for the out-of-range indicator if system protection against input saturation is necessary. Ensure the driving circuitry can handle the dynamic input impedance characteristics of the switched-capacitor sample-and-hold stage.

Part Context

The AD9225 belongs to a family of complete monolithic A/D converters that includes pin-compatible variants such as the AD9220, AD9221, AD9223, and AD9224. These devices share similar architectural features but may differ in resolution or sampling rates. The AD9225 specifically targets applications balancing speed and power efficiency using a cost-effective CMOS process compared to older bipolar implementations.

Replacement Considerations

The AD9225 is pin compatible with the AD9220, AD9221, AD9223, and AD9224 ADCs. Verify that the alternative part number matches the required resolution and sampling rate specifications before substitution.