Analog Devices Inc. AD7492BRUZ

Overview

AD7492BRUZ 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 120 ns track/hold acquisition time. It serves as a high-speed parallel-interface data acquisition front-end in industrial instrumentation and real-time control systems.

For engineers reviewing the AD7492BRUZ datasheet, AD7492BRUZ pinout, AD7492BRUZ application, or AD7492BRUZ equivalent, this page provides verified technical context, package-validated pin functions, real-world application mappings, and two confirmed alternative parts with documented functional and interface differences.

Technical Context

The AD7492BRUZ implements a capacitive DAC-based SAR architecture with no pipeline delay, enabling precise sampling control via the CONVST falling edge and deterministic conversion completion signaled by BUSY. Its internal 2.5 V reference (±1.5% tolerance) and oscillator eliminate external timing components.

It supports flexible digital interfacing through VDRIVE-separately biasing I/O voltage levels-and dual sleep modes (partial/full) selected by PS/FS, achieving 250 μA partial sleep current and 200 nA full sleep current. Conversion time is fixed at 880 ns max, with 120 ns minimum acquisition time after BUSY goes low.

Key Specifications

Pinout & Package

AD7492BRUZ is housed in a 24-lead TSSOP package (JEDEC MO-153, 4.4 mm × 7.8 mm), thermally optimized for industrial PCBs with θ_JA = 115°C/W. 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 parallel ADC applications.

Compared with AD7492BRUZ, AD7490BRUZ trades 2 bits of resolution for lower cost and identical footprint, while ADS7822U sacrifices speed and parallel simplicity for ultra-small size and external timing flexibility-neither is pin-compatible nor drop-in.

Availability

AD7492BRUZ is available at Aetrix Electronics and suitable for industrial data acquisition, motor control feedback, portable test equipment, and energy metering front-end applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD7492BRUZ 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 AD7492BRUZ belongs to Analog Devices' precision SAR ADC product line, engineered for high-speed, low-power data acquisition in industrial, instrumentation, and real-time control systems where accuracy, timing determinism, and integration matter.

FAQ

What is the maximum sampling rate supported by the AD7492BRUZ?

The AD7492BRUZ achieves a maximum throughput rate of 1 MSPS under specified conditions (VDD = 2.7 V to 5.25 V, TA = −40°C to +85°C). This corresponds to a minimum conversion time of 880 ns and 120 ns acquisition time, enabling reliable operation in real-time control loops and high-speed data loggers. The AD7492BRUZ does not support the 1.25 MSPS rate-that applies only to the AD7492-5 variant.

Does the AD7492BRUZ require an external clock or reference?

No, the AD7492BRUZ integrates both a 2.5 V ±1.5% reference (available at REF OUT) and an on-chip clock oscillator. These eliminate the need for external timing components, reducing bill-of-materials cost and PCB area. The internal clock directly controls conversion timing, and the reference can be used externally for calibration or biasing other circuitry-no external reference or crystal is required for basic operation of the AD7492BRUZ.

How does the PS/FS pin affect power consumption in the AD7492BRUZ?

The PS/FS pin on the AD7492BRUZ selects between two hardware-defined sleep modes: tying it high enables partial sleep (250 μA max), where the reference and oscillator remain active; tying it low enables full sleep (1 μA max), where all analog circuitry powers down. When CONVST is held low past conversion completion, the AD7492BRUZ enters the selected mode automatically-enabling ultra-low-power operation without firmware intervention.

Can the AD7492BRUZ interface directly with a 3 V microcontroller?

Yes-the AD7492BRUZ supports direct interfacing with 3 V logic via its VDRIVE pin. By applying 3 V to VDRIVE, the digital outputs (DB0–DB11, BUSY, RD, CS) swing between 0 V and ~2.8 V, and input thresholds scale to ~0.9 V (high) and ~0.9 V (low), ensuring reliable communication with 3 V MCUs. AVDD and DVDD may remain at 5 V to preserve analog performance, decoupling digital I/O voltage from analog supply.

What is the purpose of the BUSY signal in the AD7492BRUZ timing sequence?

The BUSY signal on the AD7492BRUZ is an active-high, synchronous status flag indicating conversion progress. It asserts high on the falling edge of CONVST and remains high for exactly 880 ns (max), then falls low to signal that the 12-bit result is latched and ready for readout via CS/RD. Critically, BUSY's falling edge also triggers the track/hold amplifier to re-enter acquisition mode-making it essential for timing-critical sampling synchronization in the AD7492BRUZ.