AD9221ARS

Overview

The AD9221ARS is a monolithic 12-bit analog-to-digital converter operating at a maximum sampling rate of 1.5 MSPS. It utilizes a single 5 V analog supply and a digital supply ranging from 2.7 V to 5.25 V, consuming approximately 59 mW of power. The device features a differential or single-ended input structure with an on-chip sample-and-hold amplifier and programmable voltage reference. Key performance metrics include a Signal-to-Noise Ratio (SNR) of 70.2 dB typical, Integral Nonlinearity (INL) of ±0.4 LSB typical, and Differential Nonlinearity (DNL) of ±0.3 LSB typical. It is housed in a 28-lead SSOP package.

Feature Summary

• Monolithic 12-bit resolution with guaranteed no missing codes across the full operating temperature range.
• Flexible analog input configuration supporting both single-ended and differential modes with varying input spans.
• Integrated high-performance sample-and-hold amplifier and programmable internal voltage reference.
• Straight binary output data format with an out-of-range indicator for overflow detection.

Applications

• Imaging systems requiring low-power analog-to-digital conversion.
• Communications equipment utilizing direct-IF down conversion architectures.
• Medical instrumentation and portable diagnostic devices.
• Data-acquisition systems with multiplexed channel inputs.

Procurement Notes

Verify the specific ordering suffix ARS corresponds to the 28-lead SSOP package variant when sourcing components. Confirm that the required sampling rate aligns with the AD9221 specifications, as higher-speed variants within the family exist. Ensure electrostatic discharge precautions are observed during handling due to the sensitivity of the CMOS process. Check current availability status as component lifecycles may change.

Selection Notes

Select the AD9221ARS when a sampling rate of 1.5 MSPS is sufficient for the application, offering lower power consumption compared to the 3.0 MSPS and 10.0 MSPS family members. Consider the differential input flexibility if common-mode noise rejection is required. Verify that the 5 V single-supply operation fits the system power budget. Evaluate the thermal resistance characteristics if operating near the upper temperature limits.

Part Context

The AD9221ARS belongs to the AD9221/AD9223/AD9220 product family, which shares identical pinouts, packages, and interface options. This family allows designers to scale performance by selecting different sampling rates while maintaining board compatibility. The AD9221 represents the lowest speed and power option within this group, optimized for applications where energy efficiency is prioritized over maximum throughput.

Replacement Considerations

The AD9223ARS and AD9220ARS are pin-compatible replacements within the same package but offer higher sampling rates of 3.0 MSPS and 10.0 MSPS respectively. These alternatives consume more power and exhibit different dynamic performance characteristics. Downgrading to these parts requires verification that the increased speed does not introduce unnecessary power dissipation or cost without providing functional benefit.