Analog Devices Inc. AD9221AR-REEL

Overview

AD9221AR-REEL from Analog Devices is a monolithic 12-bit analog-to-digital converter with 1.5 MSPS sampling rate, ±0.4 LSB typical integral nonlinearity, 70 dB SINAD, and on-chip sample-and-hold amplifier and voltage reference. It operates from a single 5 V analog supply and 2.7–5.25 V digital supply, consuming 59 mW typical power, and targets precision data acquisition in medical instrumentation and imaging systems.

For engineers reviewing the AD9221AR-REEL datasheet, AD9221AR-REEL pinout, AD9221AR-REEL application, or AD9221AR-REEL equivalent, key selection considerations include its 28-lead SOIC package, straight binary output format, out-of-range (OTR) flag, differential/single-ended input flexibility, and guaranteed no missing codes over –40°C to +85°C.

Technical Context

The AD9221AR-REEL implements a 4-stage differential pipelined ADC architecture with digital error correction logic, enabling true 12-bit accuracy and guaranteed no missing codes across temperature. Its sample-and-hold amplifier supports both single-ended and differential inputs with programmable common-mode level via VINA/VINB and configurable input spans of 2 V or 5 V p-p.

Internal timing uses the rising edge of CLK for sampling; pipeline latency is fixed at 3 clock cycles. The device accepts an internal 1 V or 2.5 V reference (selected via SENSE pin) or an external reference, with input referred noise specified at 0.09 LSB rms (VREF = 2.5 V) and aperture jitter of 4 ps rms.

Key Specifications

Pinout & Package

AD9221AR-REEL is housed in a 28-lead Small Outline Integrated Circuit (SOIC) package with standard JEDEC MS-013AC footprint (body width 7.5 mm, lead pitch 1.27 mm), rated for operation from –40°C to +85°C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit ADC applications.

Compared with AD9223AR-REEL, the AD9221AR-REEL trades 2× lower sampling rate for 41% lower power and better low-frequency linearity; versus ADS8325IPW, it offers pipeline latency tolerance and superior AC performance at the cost of resolution and static accuracy.

Availability

AD9221AR-REEL is available at Aetrix Electronics and suitable for medical imaging, industrial process monitoring, and test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AD9221AR-REEL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD9221AR-REEL belongs to the AD922x family of monolithic 12-bit pipelined ADCs designed for cost-sensitive, low-power precision data acquisition in medical, industrial, and communications systems.

FAQ

What is the maximum sampling rate supported by the AD9221AR-REEL?

The AD9221AR-REEL supports a maximum conversion rate of 1.5 MSPS, as confirmed in the Absolute Maximum Ratings and DC/AC Specifications tables. This rate is maintained across the full operating temperature range (–40°C to +85°C) with specified performance including 70 dB SINAD and ±0.4 LSB INL. Exceeding this rate degrades dynamic performance and may cause missing codes.

Does the AD9221AR-REEL require an external voltage reference?

No, the AD9221AR-REEL includes an internal programmable voltage reference that can be configured for either 1 V or 2.5 V output via the SENSE pin. External reference operation is optional and supported through the VREF pin, but not required. The internal reference has ±35 mV tolerance (2.5 V mode) and load regulation of ≤2.0 mV with 1 mA load.

What package type is used for the AD9221AR-REEL?

The AD9221AR-REEL is supplied in a 28-lead Small Outline Integrated Circuit (SOIC) package, designated R-28 in the Analog Devices ordering guide. It features a standard JEDEC MS-013AC outline with 1.27 mm lead pitch and is rated for industrial temperature operation (–40°C to +85°C).

How does the out-of-range (OTR) signal function in the AD9221AR-REEL?

The OTR signal on the AD9221AR-REEL is an active-high indicator that asserts when the analog input exceeds the valid range defined by ±VREF. Used in conjunction with the MSB (BIT 1), it distinguishes between high overflow (MSB = 1, OTR = 1) and low overflow (MSB = 0, OTR = 1), enabling robust saturation detection in real-time signal processing chains.

Can the AD9221AR-REEL interface directly with 3.3 V logic systems?

Yes, the AD9221AR-REEL supports 3.3 V digital interfacing: its DVDD supply accepts 2.7–5.25 V, and logic output levels meet 3.3 V CMOS thresholds (VOH ≥ 2.80 V at IOH = 0.5 mA; VOL ≤ 0.4 V at IOL = 1.6 mA). No level-shifting circuitry is required when connecting to 3.3 V FPGAs or microcontrollers.