Analog Devices Inc. AD7472ARUZ

Overview

AD7472ARUZ from Analog Devices is a 12-bit, 1.5 MSPS high-speed successive approximation ADC with parallel interface, 2.7 V to 5.25 V single-supply operation, and external 2.5 V reference input. It features 70 dB typical SNR at 500 kHz input frequency, 14-cycle conversion time, and sleep mode consuming just 1 µA (5 V) or 2 µA (3 V). It is used in real-time data acquisition systems requiring low-latency, no-pipeline-delay digitization of analog sensor or signal chain outputs.

For engineers reviewing the AD7472ARUZ datasheet, AD7472ARUZ pinout, AD7472ARUZ application, or AD7472ARUZ equivalent, this page delivers verified technical context, exact package mapping (TSSOP-24), confirmed timing behavior (BUSY delay = 531.66 ns @ 26 MHz), and validated alternative options for industrial and embedded measurement designs.

Technical Context

The AD7472ARUZ implements a standard SAR architecture with track-and-hold amplifier, externally clocked conversion (14 CLK IN cycles), and asynchronous control via CONVST, CS, and RD. Its BUSY output asserts high on falling CONVST edge and deasserts 531.66 ns later at 26 MHz - enabling precise timing synchronization without pipeline latency.

All digital outputs (DB0–DB11) are three-state, driven by VDRIVE (2.7 V to 5.25 V), allowing independent logic-level interfacing (e.g., 5 V AVDD/DVDD with 3 V microcontroller I/O). The part supports auto-sleep mode: if CONVST remains low after BUSY falls, it enters sleep; rising CONVST wakes it in ≤1 µs.

Key Specifications

Pinout & Package

AD7472ARUZ is housed in a 24-lead TSSOP (RU-24) package with exposed pad (thermal pad not electrically connected). Pin 1 is marked by a dot; pins are numbered counterclockwise. AGND and DGND must be kept within ±0.3 V; AVDD and DVDD must be decoupled separately to respective grounds.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7472ARUZ, AD7472BRU offers tighter DC accuracy for precision measurement, while AD7472YRU provides extended thermal reliability - neither requires PCB changes, but selection depends on whether accuracy grade or temperature rating is the dominant design constraint.

Availability

AD7472ARUZ is available at Aetrix Electronics and suitable for industrial process monitoring, medical instrumentation, test equipment, and motor control applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD7472ARUZ 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, with design and manufacturing expertise spanning precision data conversion, power management, and RF technologies.

The AD7472ARUZ belongs to Analog Devices' high-speed SAR ADC product line, designed specifically for applications demanding low-latency, pipeline-free digitization with flexible power management and robust parallel interfacing in industrial and embedded systems.

FAQ

What is the maximum clock frequency supported by AD7472ARUZ?

The AD7472ARUZ supports a maximum CLK IN frequency of 26 MHz at 5 V and 20 MHz at 3 V. At 26 MHz, the conversion time is fixed at 14 clock cycles (538.5 ns), enabling its rated 1.5 MSPS throughput. Exceeding 26 MHz may cause timing violations and invalid conversion results, as confirmed in the Absolute Maximum Ratings and Timing Specifications sections of the datasheet.

Does AD7472ARUZ require an external reference voltage?

Yes, AD7472ARUZ requires an external 2.5 V reference applied to the REF IN pin. The device does not include an internal reference. Performance specifications - including INL, SNR, and gain error - are guaranteed only when REF IN is 2.5 V ±1%. Deviations outside this range degrade DC accuracy and dynamic performance, as explicitly stated in the REF IN Input Voltage Range specification.

Can AD7472ARUZ interface directly with a 3.3 V microcontroller?

Yes, AD7472ARUZ can interface directly with a 3.3 V microcontroller using the VDRIVE pin. By supplying 3.3 V to VDRIVE, the DB0–DB11 outputs swing to VOH = VDRIVE – 0.2 V (≥3.1 V) and VOL ≤0.4 V - meeting 3.3 V CMOS logic thresholds. AVDD and DVDD may remain at 5 V for optimal analog performance, as confirmed in the LOGIC OUTPUTS and VDRIVE function descriptions.

What is the purpose of the BUSY signal in AD7472ARUZ?

The BUSY signal in AD7472ARUZ is a hardware status indicator that goes high on the falling edge of CONVST and returns low 531.66 ns later (at 26 MHz) to signal completion of conversion and availability of the result in the output register. It enables synchronous, zero-wait-state data capture without polling, and its timing is fully characterized - making it essential for deterministic real-time interfacing with FPGAs or fast microcontrollers.

How does auto-sleep mode work in AD7472ARUZ?

In auto-sleep mode, AD7472ARUZ automatically enters low-power sleep (1 µA max at 5 V) when CONVST remains low after BUSY falls. A rising edge on CONVST wakes the device in ≤1 µs, after which it performs the next conversion. This behavior is intrinsic to the silicon design - no configuration register or command is needed - and is verified in the General Description and CONVST pin function description.