Analog Devices Inc. AD7492ARUZ

Overview

AD7492ARUZ from Analog Devices is a 12-bit, 1 MSPS successive approximation ADC with internal 2.5 V reference, on-chip clock oscillator, and high-speed parallel interface. It operates from a single 2.7 V to 5.25 V supply, delivers 70 dB typical SNR at 100 kHz input, and supports flexible power management via partial/full sleep modes. It is used in high-speed data acquisition systems requiring low-latency, no-pipeline-delay conversion.

For engineers reviewing the AD7492ARUZ datasheet, AD7492ARUZ pinout, AD7492ARUZ application, or AD7492ARUZ equivalent, this page provides verified technical context, real-world interface timing, confirmed analog input range (0 V to 2.5 V), validated sleep-mode current specs (250 μA partial / 200 nA full), and precise parallel bus timing constraints including 880 ns max conversion time and 120 ns min acquisition time.

Technical Context

The AD7492ARUZ implements a capacitive DAC-based SAR architecture with track/hold amplifier bandwidth up to 10 MHz. Conversion is initiated on the falling edge of CONVST, with BUSY going high immediately and returning low after 880 ns - indicating completion without pipeline delay. The internal 2.5 V reference (±1.5% tolerance) is available at REF OUT and sets the full-scale analog input range.

Digital interface voltage levels are decoupled from AVDD/DVDD via VDRIVE (2.7 V–5.25 V), enabling 5 V analog performance while interfacing to 3 V logic. Sleep mode selection (partial or full) is hardware-controlled by PS/FS pin state, and wake-up occurs on rising edge of CONVST after sleep entry triggered by sustained low CONVST at BUSY deassertion.

Key Specifications

Pinout & Package

AD7492ARUZ is housed in a 24-lead TSSOP package (RUZ suffix), with exposed pad for thermal enhancement and standard JEDEC MO-153 footprint. Pin layout supports compact PCB routing with separate AGND/DGND and AVDD/DVDD/VDRIVE supplies.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7492ARUZ, AD7492BRUZ improves DC accuracy for calibration-critical use cases, while AD7492-5ARUZ increases speed for dynamic signal capture - both retain full software and hardware compatibility, enabling drop-in upgrades where performance margins permit.

Availability

AD7492ARUZ is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical instrumentation, automotive sensor interface, test & measurement equipment, and high-reliability data acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD7492ARUZ 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 series belongs to Analog Devices' precision SAR ADC product line, designed specifically for high-speed, low-power, single-supply data acquisition in space- and energy-constrained embedded systems.

FAQ

What is the maximum sampling rate supported by the AD7492ARUZ?

The AD7492ARUZ supports a maximum throughput rate of 1 MSPS, corresponding to a conversion time of 880 ns and minimum acquisition time of 120 ns. This allows reliable sampling of input signals up to 500 kHz under Nyquist criteria. The AD7492ARUZ does not support the 1.25 MSPS rate - that is exclusive to the AD7492-5ARUZ variant.

Does the AD7492ARUZ require an external reference voltage?

No, the AD7492ARUZ includes a precision 2.5 V internal reference with ±1.5% initial accuracy over temperature, available at the REF OUT pin. This reference sets the full-scale analog input range (0 V to 2.5 V) and eliminates the need for external reference components unless higher accuracy or adjustable range is required.

How does the PS/FS pin affect power consumption in the AD7492ARUZ?

The PS/FS pin selects between two low-power sleep modes in the AD7492ARUZ: logic high enables partial sleep (250 μA max), retaining internal reference and clock; logic low enables full sleep (1 μA max, 200 nA typical), powering down all analog blocks. Sleep is automatically entered when CONVST remains low after BUSY goes low.

Can the AD7492ARUZ interface directly with a 3 V microcontroller?

Yes - the AD7492ARUZ uses VDRIVE to decouple I/O voltage levels from AVDD/DVDD. By applying 3 V to VDRIVE, the digital outputs (DB0–DB11, BUSY, etc.) swing between 0 V and ~2.8 V, and input thresholds scale accordingly (VINH ≈ 2.1 V, VINL ≈ 0.9 V), ensuring reliable interfacing with 3 V logic without level shifters.

What is the purpose of separate AGND and DGND pins on the AD7492ARUZ?

The AD7492ARUZ features dedicated AGND and DGND pins to minimize noise coupling between analog and digital sections. They must be tied together at a single point near the device (not at the power supply) and kept within ±0.3 V potential difference. This separation preserves 70 dB SNR performance by preventing digital switching noise from modulating the analog signal path.