Analog Devices Inc. AD7492ARU-5

Overview

AD7492ARU-5 from Analog Devices is a 12-bit, 1.25 MSPS successive approximation ADC with integrated 2.5 V reference and on-chip clock oscillator. It operates from a single 4.75–5.25 V supply, consumes 16 mW typical at full throughput, and delivers 69 dB SINAD at 500 kHz input - enabling high-fidelity data acquisition in space-constrained industrial and instrumentation systems.

For engineers reviewing the AD7492ARU-5 datasheet, AD7492ARU-5 pinout, AD7492ARU-5 application, or AD7492ARU-5 equivalent, key selection considerations include its no-pipeline-delay parallel interface, dual sleep modes (full/partial), VDRIVE-controlled I/O voltage flexibility, and guaranteed 12-bit no-missed-codes performance across −40°C to +85°C.

Technical Context

The AD7492ARU-5 implements a capacitive DAC-based SAR architecture with track/hold acquisition time of 120 ns and aperture jitter of 15 ps typ. Conversion is initiated on the falling edge of CONVST, with BUSY going low after 680 ns max - eliminating pipeline latency and enabling deterministic timing for real-time control loops.

Its analog front-end supports 0 V to 2.5 V unipolar input range referenced to internal REF OUT, while digital I/O levels are independently set by VDRIVE (2.7–5.25 V), allowing seamless interfacing with 3 V or 5 V microcontrollers without level shifters.

Key Specifications

Pinout & Package

AD7492ARU-5 is housed in a 24-lead TSSOP package (RU suffix), with exposed pad for thermal enhancement and compact footprint (7.8 mm × 4.4 mm). Pin functions are validated per Analog Devices Rev. A datasheet Figure 3 and Table 5.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MAX1166BCAP+, AD7492ARU-5 uniquely combines 1.25 MSPS parallel throughput, internal reference/clock, VDRIVE I/O flexibility, and sub-µA sleep current - making it optimal for deterministic, space-constrained, mixed-voltage industrial data loggers.

Availability

AD7492ARU-5 is available at Aetrix Electronics and suitable for laser rangefinders, industrial PLC analog input modules, portable medical ECG front-ends, and automated test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD7492ARU-5 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide.

The AD7492 family was designed for high-speed, low-power data acquisition in space- and power-constrained industrial, instrumentation, and medical systems - emphasizing integration (ref + clock), timing determinism, and robust operation across extended temperature ranges.

FAQ

What is the maximum sampling rate supported by the AD7492ARU-5?

The AD7492ARU-5 supports a maximum throughput rate of 1.25 MSPS, corresponding to a conversion time of 680 ns max and track/hold acquisition time of 120 ns min. This enables accurate digitization of input signals up to 10 MHz full-power bandwidth while maintaining 69 dB SINAD at 500 kHz. The AD7492ARU-5 achieves this performance with only 16.5 mW power dissipation at 5 V supply.

Does the AD7492ARU-5 require an external reference or clock source?

No, the AD7492ARU-5 integrates both a 2.5 V ±1.5% reference (available on REF OUT pin) and an on-chip clock oscillator. These eliminate the need for external reference ICs or crystals, reducing BOM count, PCB area, and system cost. The internal reference can be used directly or serve as a precision source for external circuitry, and the internal clock fully determines conversion rate without external timing components.

How does the VDRIVE pin affect digital interface operation of the AD7492ARU-5?

The VDRIVE pin sets the supply voltage for all digital I/O circuitry (DB0–DB11, CS, RD, CONVST, BUSY, PS/FS), defining input threshold levels (VINH = VDRIVE × 0.7, VINL = VDRIVE × 0.3) and output swing (VOH = VDRIVE − 0.2 V). This allows the AD7492ARU-5 to interface directly with 3 V or 5 V logic families without level shifters - even when AVDD/DVDD operate at 5 V for optimal analog performance.

What sleep modes are available on the AD7492ARU-5 and how are they selected?

The AD7492ARU-5 offers two hardware-selectable sleep modes: partial sleep (250 µA max, analog reference and clock active) and full sleep (1 µA max, all analog circuitry powered down). Selection is controlled by the PS/FS pin: logic high selects partial sleep, logic low selects full sleep. Sleep is automatically entered when CONVST remains low after BUSY goes low, and wake-up occurs on the next rising edge of CONVST.

Is the AD7492ARU-5 pin-compatible with other variants in the AD7492 family?

Yes, the AD7492ARU-5 shares identical pinout and package (24-lead TSSOP) with AD7492ARU and AD7492ARU-4. All variants use the same functional block diagram, timing structure, and interface protocol. Differences are limited to conversion speed (1.25 MSPS vs. 1 MSPS vs. 400 kSPS) and associated dynamic specifications - allowing drop-in replacement where throughput requirements permit.