Analog Devices Inc. AD7472AR-REEL

Overview

AD7472AR-REEL from Analog Devices is a 12-bit, 1.5 MSPS successive approximation analog-to-digital converter (ADC) with parallel interface, operating from a single 2.7 V to 5.25 V supply and consuming 4.5 mW typical at 3 V. It features 70 dB SNR at 500 kHz input, 12-bit resolution with ±1 LSB INL (B version), and supports external 2.5 V reference for precision measurement in data acquisition systems.

For engineers reviewing the AD7472AR-REEL datasheet, AD7472AR-REEL pinout, AD7472AR-REEL application, or AD7472AR-REEL equivalent, this page delivers verified electrical specs, SOIC-24 package mapping, timing-critical interface behavior (CONVST-triggered sampling, BUSY-driven read synchronization), and real-world trade-offs versus alternative 12-bit parallel ADCs.

Technical Context

The AD7472AR-REEL implements a standard successive approximation register (SAR) architecture with integrated track-and-hold, no pipeline delay, and precise sampling controlled by the falling edge of CONVST. Conversion completes in 14 clock cycles, with BUSY high during conversion and low when result is ready in the output register.

It uses separate analog (AVDD/AGND) and digital (DVDD/DGND) supplies with strict ≤0.3 V inter-supply tolerance, plus dedicated VDRIVE for level-shiftable 3-state parallel outputs (DB0–DB11). Reference is externally applied to REF IN (2.5 V ±1%), and full-power bandwidth reaches 20 MHz.

Key Specifications

Pinout & Package

AD7472AR-REEL is housed in a 24-lead SOIC (R-24) package with standard 0.3-inch body width and 1.27 mm pitch. Pin assignments are validated per Analog Devices Rev. B datasheet Figure 7 (AD7472 top view).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7472BR-REEL, AD7472AR-REEL trades guaranteed 12-bit linearity for lower cost while retaining identical speed, package, and interface; versus MAX1166BCAP+, it delivers 6× higher throughput and superior dynamic performance at the expense of interface complexity and external reference dependency.

Availability

AD7472AR-REEL is available at Aetrix Electronics and suitable for industrial process monitoring, test equipment design, medical instrumentation, and communications baseband processing requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AD7472AR-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 AD7470/AD7472 product line delivers high-speed, low-power SAR ADCs optimized for precision data acquisition in space- and power-constrained embedded systems where parallel interface latency and deterministic timing are critical.

FAQ

What is the maximum sampling rate supported by the AD7472AR-REEL?

The AD7472AR-REEL achieves a maximum throughput rate of 1.5 MSPS when operated with a 26 MHz master clock at 5 V supply. At 3 V, the maximum rated clock is 20 MHz, yielding 1.2 MSPS. This rate is determined by the 14-clock-cycle conversion time and external CLKIN frequency, not internal oscillator.

Does the AD7472AR-REEL require an external reference voltage?

Yes, the AD7472AR-REEL requires an external 2.5 V reference applied to the REF IN pin. The device does not include an internal reference; performance specifications-including gain error, SNR, and full-scale accuracy-are guaranteed only with a 2.5 V ±1% reference source.

How does the CONVST signal control sampling and power state in the AD7472AR-REEL?

The falling edge of CONVST initiates sampling (T/H transitions from track to hold) and starts conversion. If CONVST remains low after BUSY goes low, the AD7472AR-REEL automatically enters sleep mode (1 µA typical). A rising edge on CONVST wakes the part in ≤1 µs, enabling event-triggered low-power operation.

What is the purpose of the VDRIVE pin on the AD7472AR-REEL?

VDRIVE sets the high-level output voltage (VOH) for the DB0–DB11 parallel data bus. It allows independent biasing-e.g., AVDD = 5 V for optimal analog performance while VDRIVE = 3.3 V to interface directly with 3.3 V logic, eliminating level-shifters in mixed-voltage systems.

Can the AD7472AR-REEL operate from a 3 V supply, and what performance changes occur?

Yes, the AD7472AR-REEL operates from 2.7 V to 5.25 V. At 3 V, maximum throughput drops to 1.2 MSPS (20 MHz CLKIN), power dissipation reduces to 4.5 mW max, and SNR remains 70 dB typ at 500 kHz. All DC accuracy specs (INL, DNL, offset, gain) are maintained across the supply range.