Analog Devices Inc. AD7472BR

Overview

AD7472BR from Analog Devices is a 12-bit, 1.5 MSPS high-speed successive approximation 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, ±1 LSB max integral nonlinearity (B-grade), and 24-lead SOIC packaging - used in precision data acquisition systems requiring low-latency, no-pipeline-delay conversion.

For engineers reviewing the AD7472BR datasheet, AD7472BR pinout, AD7472BR application, or AD7472BR equivalent, key selection considerations include its 12-bit resolution, 1.5 MSPS throughput at 5 V, B-grade DC accuracy (±1 LSB INL), sleep-mode current of 1 µA, and compatibility with external 2.5 V reference and flexible VDRIVE for mixed-voltage interfacing.

Technical Context

The AD7472BR implements a track-and-hold amplifier followed by a 12-bit successive approximation register (SAR) core, with conversion initiated on the falling edge of CONVST and completed in exactly 14 CLK IN cycles. Its BUSY signal asserts for the full conversion duration and deasserts 531.66 ns after CONVST (at 26 MHz clock), enabling precise timing control without pipeline latency.

It supports dual-supply separation (AVDD/DVDD ≤ 0.3 V differential), independent VDRIVE (2.7–5.25 V) for output driver level setting, and auto-sleep mode triggered by sustained low CONVST - reducing average current to 124 µA at 100 kSPS/3 V. Reference is externally applied to REF IN (2.5 V ±1%), and analog input range is 0 V to REF IN.

Key Specifications

Pinout & Package

AD7472BR is housed in a 24-lead SOIC (R-24) package with standard JEDEC MS-013AC footprint, 0.3-inch body width, and 1.27 mm pitch. Thermal impedance θ_JA = 75°C/W enables operation up to +85°C ambient with minimal heatsinking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7472AR, the AD7472BR provides tighter DC accuracy for calibration-critical systems; compared with AD7472BRU, it offers higher thermal dissipation (θ_JA = 75°C/W vs. 115°C/W) and easier manual soldering - making AD7472BR optimal for thermally demanding or low-volume production environments.

Availability

AD7472BR is available at Aetrix Electronics and suitable for industrial process monitoring, motor control feedback, portable medical instrumentation, and test & measurement front-ends requiring stable component supply, long-term lifecycle support, and guaranteed B-grade specifications.

Supply support for AD7472BR 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 AD7472BR belongs to the AD7470/AD7472 family of low-power, high-speed parallel-output SAR ADCs designed for applications demanding deterministic latency, wide input bandwidth, and flexible power management in industrial and instrumentation systems.

FAQ

What is the maximum clock frequency supported by the AD7472BR?

The AD7472BR supports a maximum CLK IN frequency of 26 MHz at 5 V and 20 MHz at 3 V, as specified for B-grade operation. At 26 MHz, the 14-cycle conversion time yields a 1.5 MSPS throughput rate. Exceeding these frequencies may violate timing margins and degrade AC performance such as SINAD and SFDR. The AD7472BR datasheet explicitly defines these limits under "AD7472–SPECIFICATIONS" for B Version.

Does the AD7472BR require an external reference, and what voltage is required?

Yes, the AD7472BR requires an external reference applied to the REF IN pin. The specified reference voltage is 2.5 V ±1% for guaranteed DC accuracy and dynamic performance. Using a reference outside this tolerance - such as 3.3 V or 5 V - invalidates all published specifications including INL, SNR, and THD. The AD7472BR does not include an internal reference; reference stability and noise directly impact overall system accuracy.

How does the auto-sleep mode function on the AD7472BR?

The AD7472BR enters auto-sleep mode automatically when the CONVST pin remains low after conversion completes and BUSY goes low. In this state, quiescent current drops to 1 µA max. A rising edge on CONVST wakes the device within 1 µs typical, after which it resumes normal operation. This behavior is inherent to the AD7472BR's control logic and requires no software configuration - ideal for burst-mode acquisition in energy-constrained systems.

What is the purpose of the VDRIVE pin on the AD7472BR?

The VDRIVE pin on the AD7472BR sets the high-level output voltage (VOH = VDRIVE – 0.2 V) for the DB0–DB11 parallel data outputs. It allows independent scaling of digital output levels - for example, running AVDD/DVDD at 5 V for optimal analog performance while interfacing to a 3.3 V FPGA or microcontroller via VDRIVE = 3.3 V. This decoupling prevents level-shifter components and simplifies mixed-voltage system design.

Is the AD7472BR pin-compatible with other members of the AD7470/AD7472 family?

Yes, the AD7472BR is pin-compatible with all AD7472 variants (e.g., AD7472AR, AD7472BRU, AD7472YR) in the same package type (R-24 SOIC). It shares identical pin functions, timing, and electrical characteristics with those variants. However, it is not pin-compatible with AD7470-series parts (10-bit), as they feature DB0–DB9 outputs only and different internal timing - attempting substitution would cause bus contention and incorrect data reads.