Analog Devices Inc. AD9225ARS

Overview

AD9225ARS from Analog Devices is a monolithic 12-bit, 25 MSPS analog-to-digital converter with integrated sample-and-hold amplifier and programmable voltage reference. It operates on a single 5 V supply, delivers 71 dB SNR and –85 dB SFDR, and guarantees no missing codes across temperature. It serves as the front-end digitizer in high-speed communications receivers and medical ultrasound beamformers.

For engineers reviewing the AD9225ARS datasheet, AD9225ARS pinout, AD9225ARS application, or AD9225ARS equivalent, key selection criteria include guaranteed 12-bit linearity at 25 MSPS, differential input flexibility (single-ended or true differential), out-of-range flag for overflow detection, and compatibility with both 3 V and 5 V digital logic families.

Technical Context

The AD9225ARS employs a four-stage differential pipelined architecture with digital error correction logic to achieve 12-bit accuracy at 25 MSPS. Its SHA supports full-scale switching between channels and sampling beyond Nyquist, with aperture jitter of 1 ps rms and acquisition time of 10 ns to full-scale step.

It features dual-reference operation: internal 1 V or 2 V bandgap reference selectable via SENSE pin, or external reference support. The analog core accepts differential inputs (VINA–VINB) spanning ±VREF, where VREF sets full-scale input range (2 × VREF), and common-mode level is set independently via CML pin.

Key Specifications

Pinout & Package

AD9225ARS is packaged in a 28-lead SOIC (Small Outline Integrated Circuit) with standard 0.3-inch body width and 1.27 mm pitch. Pin layout is identical to SSOP variant, enabling footprint interchangeability in board design.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed ADC applications.

Compared with AD9225ARS, AD9220ARS trades 2 bits of resolution and 5 MSPS speed for lower cost and power, while ADS5271IPFP offers higher speed and serial output at the expense of package incompatibility and increased system-level design effort.

Availability

AD9225ARS is available at Aetrix Electronics and suitable for communications infrastructure, medical imaging, industrial test equipment, and high-speed data acquisition requiring stable component supply and long-term obsolescence management.

Supply support for AD9225ARS 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 AD9225ARS belongs to Analog Devices' high-speed precision ADC product line, designed specifically for applications demanding 12-bit accuracy at multi-MSPS rates with integrated analog front-end functionality and low power consumption.

FAQ

What is the maximum sampling rate supported by the AD9225ARS?

The AD9225ARS supports a maximum conversion rate of 25 MSPS, as confirmed in its DC and AC specifications tables. This rate is achievable across the full industrial temperature range (–40°C to +85°C) with all specified performance parameters maintained, including SNR, SFDR, and linearity. The device uses a pipelined architecture with 3-clock-cycle latency, meaning new samples are accepted every 40 ns (1/25 MHz).

Does the AD9225ARS require an external voltage reference?

No, the AD9225ARS does not require an external voltage reference. It integrates a programmable bandgap reference that can be configured for either 1 V or 2 V output via the SENSE pin. When SENSE is tied to AVSS, VREF = 2.0 V; when shorted to VREF, VREF = 1.0 V. An external reference may be used by disabling the internal reference (tie SENSE to AVDD), but it is optional-not mandatory-for AD9225ARS operation.

What package type is used for the AD9225ARS?

The AD9225ARS is supplied in a 28-lead Small Outline Integrated Circuit (SOIC) package with standard 0.3-inch body width and 1.27 mm lead pitch. This package is identical in footprint and pinout to the 28-lead SSOP variant, allowing direct substitution in layouts supporting either package. The "ARS" suffix explicitly denotes the SOIC packaging option per Analog Devices' part numbering convention.

How does the OTR (Out-of-Range) pin function on the AD9225ARS?

The OTR pin on the AD9225ARS is an active-high digital output that asserts when the differential analog input (VINA – VINB) exceeds the valid range of ±VREF. It works in conjunction with the MSB (BIT 1) to distinguish between high overflow (OTR high, BIT 1 high) and low overflow (OTR high, BIT 1 low). This enables real-time signal integrity monitoring and supports automatic gain control (AGC) algorithms without requiring post-processing analysis of output data.

Is the AD9225ARS compatible with 3 V logic systems?

Yes, the AD9225ARS is fully compatible with 3 V logic systems. Its digital output drivers are powered by a separate supply pin (DRVDD), which accepts voltages from 2.85 V to 5.25 V. When DRVDD = 3.3 V, the VOH and VOL specifications meet standard 3 V CMOS logic thresholds (VOH ≥ 2.4 V, VOL ≤ 0.4 V at IOL = 1.6 mA), enabling direct connection to FPGAs, ASICs, or microcontrollers operating at 3.3 V without level-shifting circuitry.