AD9225ARS

Overview

The AD9225ARS is a monolithic, single-supply, 12-bit analog-to-digital converter operating at a maximum sampling rate of 25 MSPS. It utilizes a multistage differential pipelined architecture with output error correction logic to guarantee no missing codes across the full operating temperature range. The device integrates a high-performance sample-and-hold amplifier and an on-chip voltage reference. It accepts differential or single-ended analog inputs and provides straight binary digital output data compatible with 3 V logic families. Power consumption is specified at 280 mW with a single 5 V supply.

Feature Summary

• Integrates a complete 12-bit, 25 MSPS conversion function within a single chip using a cost-effective CMOS process.
• Features a versatile sample-and-hold amplifier input configurable for either single-ended or differential signal sources.
• Includes an out-of-range indicator bit to signal overflow conditions relative to the input range.
• Operates from a single 5 V analog supply while supporting separate digital driver supplies for 3 V or 5 V logic compatibility.

Applications

• Communications systems requiring high-speed data acquisition
• Imaging applications utilizing multiplexed channels
• Medical ultrasound equipment

Procurement Notes

Verify the specific package variant when ordering, as the base model number covers both SOIC and SSOP footprints. Confirm that the SENSE pin configuration matches the required internal reference voltage setting (1 V or 2 V) for the target application. Ensure proper decoupling capacitors are placed on the CAPT and CAPB pins to maintain stability and noise performance during operation.

Selection Notes

Select this component for designs requiring a balance between high speed and low power dissipation in a single-supply environment. Consider the 28-lead SOIC or SSOP package availability based on PCB layout constraints. Evaluate the input span requirements against the available internal reference options or external reference capabilities to ensure optimal dynamic performance.

Part Context

The AD9225 belongs to the Analog Devices AD922x family of monolithic ADCs. It shares pin compatibility with the AD9220, AD9221, AD9223, and AD9224 models, facilitating design upgrades or changes in resolution and speed without altering the board footprint. This family utilizes a similar pipeline architecture optimized for CMOS efficiency.

Replacement Considerations

The AD9225ARZ serves as the lead-free equivalent of the AD9225AR. For different packaging, the AD9225ARSZ corresponds to the SSOP variant. Other members of the AD922x family such as the AD9220, AD9221, AD9223, and AD9224 are pin-compatible but offer varying resolutions or sampling rates.