AD9221ARS-REEL

Overview

The AD9221ARS-REEL is a monolithic 12-bit analog-to-digital converter from Analog Devices, operating at a maximum sampling rate of 1.5 MSPS. It features a single 5 V analog supply and consumes 59 mW typical power. The device integrates a high-performance sample-and-hold amplifier and a programmable voltage reference supporting 1 V or 2.5 V outputs. DC accuracy includes ±0.4 LSB typical INL and ±0.3 LSB typical DNL with guaranteed no missing codes. AC performance yields 70 dB SINAD and 86 dB SFDR at full scale. It utilizes a differential pipelined architecture with straight binary output and an out-of-range indicator.

Feature Summary

• Monolithic 12-bit resolution with true linearity across the full operating temperature range.
• Integrated on-chip sample-and-hold amplifier and programmable voltage reference.
• Flexible analog input structure supporting both single-ended and differential configurations.
• Straight binary digital output with an out-of-range (OTR) overflow detection signal.

Applications

• Imaging systems requiring low-power 12-bit digitization
• Medical instrumentation data acquisition
• Communications systems employing Direct-IF down conversion

Procurement Notes

Verify the specific ordering suffix to confirm package type and reel configuration. The AD9221ARS variant indicates a 28-lead SSOP package. Confirm that the REEL designation matches automated assembly requirements. Ensure compatibility with ESD handling protocols during installation.

Selection Notes

Select this component when a 1.5 MSPS sampling rate meets system bandwidth needs while minimizing power consumption compared to higher-speed family members like the AD9220. Verify that the 5 V single-supply requirement aligns with available power rails. Check if the integrated reference specifications satisfy thermal drift constraints for the application.

Part Context

This part belongs to the AD922x product family, which shares identical pinouts and interface options. The family includes the AD9223 (3.0 MSPS) and AD9220 (10.0 MSPS), allowing designers to scale performance and power dissipation without changing board layouts. All members utilize the same CMOS pipelined architecture.

Replacement Considerations

Direct substitutes within the same family include the AD9223ARS and AD9220ARS for higher speed requirements. For lower power needs, verify if the AD9221AR in SOIC packaging is acceptable if package changes are permitted.

FAQ

What is the pipeline latency of the AD9221?

The device has a fixed pipeline delay of three clock cycles between the input clock edge and the appearance of the corresponding digital output data.

How does the OTR pin function?

The Out-of-Range (OTR) pin provides a logic signal indicating an overflow condition. Combined with the Most Significant Bit (MSB), it allows the system to distinguish between high and low signal overflows.

Can the AD9221 operate with a 3.3 V digital supply?

Yes, the digital supply (DVDD) accepts voltages between 2.7 V and 5.25 V, allowing compatibility with 3.3 V logic families while maintaining a 5 V analog supply.