Analog Devices Inc. AD7472ARZ

Overview

AD7472ARZ 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 just 4.5 mW at 3 V. It features 70 dB typical SNR at 500 kHz input frequency, 20 MHz full-power bandwidth, and integrated track-and-hold amplifier - used in high-speed data acquisition systems for industrial instrumentation and real-time signal monitoring.

For engineers reviewing the AD7472ARZ datasheet, AD7472ARZ pinout, AD7472ARZ application, or AD7472ARZ equivalent, key selection considerations include its 12-bit resolution with ±2 LSB integral nonlinearity, 14-cycle conversion time, external 2.5 V reference requirement, and SOIC-24 package compatibility with standard PCB layouts for precision ADCs.

Technical Context

The AD7472ARZ implements a standard successive approximation register (SAR) architecture without pipeline delays, using a falling-edge-triggered CONVST input to initiate sampling and conversion. Its track-and-hold amplifier supports input frequencies up to 1 MHz, and conversion timing is fully determined by an externally applied clock (up to 26 MHz at 5 V).

It employs separate analog (AVDD/AGND) and digital (DVDD/DGND) supplies with strict ≤0.3 V inter-rail tolerance, plus independent VDRIVE for output driver level-shifting. The BUSY signal provides precise end-of-conversion indication (531.66 ns after CONVST fall at 26 MHz), enabling deterministic microprocessor or DSP interfacing via CS/RD handshaking.

Key Specifications

Pinout & Package

AD7472ARZ is housed in a 24-lead SOIC (R-24) package with standard 0.3-inch body width and 1.27 mm pitch. Pin 1 is marked with a notch or dot; pins are numbered counterclockwise from top-left corner when viewed from top.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7472BRU, AD7472ARZ offers higher production volume availability in SOIC and relaxed DC specs for cost-optimized industrial use; versus ADS7822U, it delivers 6× faster throughput and superior noise performance at the expense of interface complexity and supply partitioning requirements.

Availability

AD7472ARZ is available at Aetrix Electronics and suitable for industrial data acquisition, motor control feedback, and portable test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for AD7472ARZ 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 Wilmington, MA.

The AD7472ARZ belongs to Analog Devices' precision SAR ADC product line, designed specifically for high-speed, low-power data acquisition in industrial, instrumentation, and medical applications where deterministic timing and DC accuracy are critical.

FAQ

What is the maximum clock frequency supported by AD7472ARZ?

The AD7472ARZ supports up to 26 MHz clock input at 5 V supply and 20 MHz at 3 V supply. At 26 MHz, the device achieves its rated 1.5 MSPS throughput with a fixed 14-cycle conversion time. Exceeding these frequencies violates timing specifications and may cause data corruption or increased INL due to insufficient internal settling.

Does AD7472ARZ include an internal voltage reference?

No, AD7472ARZ requires an external 2.5 V ±1% reference applied to the REF IN pin. The device does not integrate any reference circuitry. Performance specifications - including SNR, INL, and THD - are guaranteed only when a stable, low-noise 2.5 V reference is used; deviation beyond ±1% degrades DC accuracy and dynamic performance.

Can AD7472ARZ operate with AVDD and DVDD at different voltages?

No - AVDD and DVDD must remain within ±0.3 V of each other at all times, even during transients. This strict rail matching prevents latch-up and ensures specified INL and THD performance. The datasheet explicitly prohibits sustained voltage differences exceeding this limit, and thermal stress testing confirms reliability degradation above ±0.3 V.

What is the purpose of the VDRIVE pin on AD7472ARZ?

VDRIVE sets the high-level output voltage (VOH = VDRIVE – 0.2 V) for the DB0–DB11 parallel data bus. It allows independent control of logic swing - e.g., AVDD = 5 V for optimal analog performance while VDRIVE = 3.3 V to interface directly with 3.3 V FPGA or microcontroller I/O banks - eliminating level-shifters in mixed-voltage systems.

Is AD7472ARZ pin-compatible with AD7470ARZ?

No - AD7472ARZ and AD7470ARZ share the same SOIC-24 package and pinout, but differ in data bus width: AD7472ARZ uses DB0–DB11 (12-bit), while AD7470ARZ uses DB0–DB9 (10-bit). Pins 21 and 22 on AD7472ARZ (DB10, DB11) are No Connect on AD7470ARZ. Interchangeability requires firmware and PCB netlist verification for unused pins.