Analog Devices Inc. AD7492AR

Overview

AD7492AR from Analog Devices is a 12-bit successive approximation ADC with internal 2.5 V reference and on-chip clock oscillator, operating from 2.7 V to 5.25 V supply. It delivers 1 MSPS throughput, 70 dB typical SNR at 100 kHz input, and 880 ns conversion time, enabling high-fidelity data acquisition in space-constrained industrial sensor interfaces and portable instrumentation.

For engineers reviewing the AD7492AR datasheet, AD7492AR pinout, AD7492AR application, or AD7492AR equivalent, key selection considerations include its parallel interface timing (CS/RD-controlled), flexible VDRIVE logic level control, dual sleep modes (partial/full), no pipeline delay architecture, and integrated reference eliminating external components.

Technical Context

The AD7492AR implements a capacitive DAC-based SAR architecture with track/hold amplifier supporting up to 10 MHz full-power bandwidth. Conversion is triggered by falling edge of CONVST, with BUSY signal indicating completion after 880 ns - no pipeline latency exists between sampling and result availability.

Its digital interface uses CS and RD signals to gate three-state parallel outputs (DB0–DB11), while VDRIVE independently sets I/O voltage levels (2.7 V to 5.25 V) - decoupling analog supply (AVDD) and digital logic domains for mixed-signal system compatibility.

Key Specifications

Pinout & Package

AD7492AR is housed in a 24-lead SOIC package (width 7.5 mm), RoHS-compliant, with standard JEDEC MS-013AC footprint and thermal impedance θ_JA = 75°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7492BR, AD7492AR trades minor linearity tolerance (±1.5 LSB vs. ±1.25 LSB) for cost efficiency in standard industrial use cases; versus ADS7822U, it delivers 5× higher throughput and eliminates two external components (REF and CLK), simplifying layout and improving system-level SNR.

Availability

AD7492AR is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable data loggers, medical instrumentation, test & measurement equipment, and embedded control systems requiring stable component supply and long-term manufacturability.

Supply support for AD7492AR 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 AD7492 product line delivers high-speed, low-power 12-bit SAR ADCs optimized for precision data acquisition in space- and power-constrained industrial, medical, and instrumentation systems.

FAQ

What is the maximum sampling rate supported by the AD7492AR?

The AD7492AR supports a maximum throughput rate of 1 MSPS. This is achieved with a conversion time of 880 ns and a minimum track/hold acquisition time of 120 ns. The device does not use pipelining, so each conversion completes fully before the next begins - ensuring deterministic timing behavior critical for real-time control applications using the AD7492AR.

Does the AD7492AR require an external reference voltage?

No, the AD7492AR includes a precision 2.5 V internal reference with ±1% initial accuracy and low temperature drift. The REF OUT pin provides this voltage for use as a stable reference for external circuitry. While an external reference can be applied to the REFIN pin to override the internal one, most designs leverage the integrated reference to reduce component count and improve system-level accuracy consistency in the AD7492AR.

How does the VDRIVE pin function in the AD7492AR?

The VDRIVE pin on the AD7492AR supplies power to the digital I/O buffer circuitry, setting both input threshold voltages (VINH/VINL) and output high-level voltage (VOH). It operates independently from AVDD and DVDD (2.7 V to 5.25 V range), allowing the AD7492AR to interface directly with 3 V logic systems while AVDD runs at 5 V - preserving analog performance without level-shifting components.

What sleep modes are available on the AD7492AR and how are they selected?

AD7492AR supports two hardware-selectable sleep modes: partial sleep (250 µA max) and full sleep (1 µA max, typ 200 nA). The PS/FS pin determines mode - tied high for partial, low for full. Sleep is automatically entered when CONVST remains low after BUSY goes low. Wake-up occurs on the next rising edge of CONVST, with wake-up times of 203 µs (partial) or 500 µs (full), enabling ultra-low-power operation in battery-powered AD7492AR deployments.

Is the AD7492AR pin-compatible with other variants in the AD7492 family?

Yes, the AD7492AR is pin-compatible with AD7492BR and AD7492-4/-5 variants. All share identical 24-lead SOIC/TSSOP footprints and pin functions. Differences lie in performance grading (A vs. B grade), throughput (1 MSPS vs. 1.25 MSPS vs. 400 kSPS), and specified operating conditions - but PCB layout and firmware interface remain unchanged across the AD7492 family, including the AD7492AR.