AD9225AR

Overview

The AD9225 is a monolithic, single-supply, 12-bit analog-to-digital converter operating at a maximum conversion rate of 25 MSPS. It utilizes a multistage differential pipelined architecture with output error correction logic to guarantee no missing codes over the full operating temperature range. The device integrates a high-performance sample-and-hold amplifier and an on-chip voltage reference. It operates from a single 5 V analog supply (AVDD) and a separate digital driver supply (DRVDD) ranging from 2.85 V to 5.25 V. Key performance metrics include a Signal-to-Noise Ratio of 71 dB and a Spurious-Free Dynamic Range of –85 dB. Power consumption is typically 280 mW.

Feature Summary

• Monolithic integration of a 12-bit ADC, sample-and-hold amplifier, and voltage reference in a single chip.
• Multistage differential pipelined architecture providing 12-bit accuracy at 25 MSPS data rates.
• Flexible analog input structure supporting both differential and single-ended configurations.
• On-board programmable voltage reference with options for internal or external reference selection.

Applications

• Communications systems
• Imaging applications
• Medical ultrasound

Procurement Notes

Verify the specific package variant required, as the AD9225 is available in both 28-Lead SOIC and SSOP formats. Confirm that the DRVDD supply voltage aligns with the target logic family, as the device supports compatibility with both 3 V and 5 V logic levels. Ensure proper decoupling capacitors are placed near the CAPT and CAPB pins to maintain signal integrity and noise performance during operation.

Selection Notes

Select the AD9225 when a low-power, high-speed 12-bit solution is needed without the complexity of bipolar implementations. Consider the flexible input span options (1 V or 2 V modes via SENSE pin) to match the source signal amplitude. Evaluate the need for an external reference if enhanced DC accuracy or lower temperature drift is required compared to the internal bandgap reference.

Part Context

The AD9225 belongs to the AD922x series of monolithic A/D converters from Analog Devices. It shares pin compatibility with other members of this family, including the AD9220, AD9221, AD9223, and AD9224. This series is designed to offer resolution and speed comparable to older bipolar technologies but with significantly reduced power consumption and cost due to its CMOS fabrication process.

Replacement Considerations

The AD9225 is pin-compatible with the AD9220, AD9221, AD9223, and AD9224. When substituting these parts, verify that the sampling rate and dynamic performance specifications of the alternative component meet the system requirements, as these parameters may vary across the series.