Analog Devices Inc. AD7492BRU

Overview

AD7492BRU 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 real-time data acquisition systems requiring low-latency, no-pipeline-delay conversion.

For engineers reviewing the AD7492BRU datasheet, AD7492BRU pinout, AD7492BRU application, or AD7492BRU equivalent, key selection criteria include its 1 MSPS throughput, 2.5 V internal reference accuracy (±1.5%), 880 ns max conversion time, 12-bit no-missed-codes performance, and 24-lead TSSOP package compatibility with microprocessor/DSP parallel bus interfacing.

Technical Context

The AD7492BRU implements a capacitive DAC-based SAR architecture with track/hold amplifier capable of 10 MHz full-power bandwidth. 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.

Its digital interface uses CS and RD to enable three-state parallel output (DB0–DB11), with logic levels referenced to VDRIVE (independent of AVDD/DVDD). The PS/FS pin selects between partial sleep (250 μA typ) and full sleep (200 nA typ), enabling dynamic power scaling across throughput rates from idle to 1 MSPS.

Key Specifications

Pinout & Package

AD7492BRU is housed in a 24-lead TSSOP package (JEDEC MO-153, 7.8 mm × 4.4 mm), pin-compatible with the SOIC variant (AD7492BRZ) and optimized for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7492BRZ, AD7492BRU offers identical electrical performance in a smaller, thermally optimized TSSOP package - ideal for space-constrained designs - while ADS7822U trades speed and integration for interface flexibility and lower pin count, requiring external support components that increase total solution size and calibration complexity.

Availability

AD7492BRU is available at Aetrix Electronics and suitable for industrial process monitoring, medical vital sign acquisition, automotive battery management, test equipment, and portable instrumentation requiring stable component supply, long-lifecycle availability, and consistent parametric performance.

Supply support for AD7492BRU 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, with design and manufacturing operations worldwide.

The AD7492BRU belongs to Analog Devices' precision SAR ADC product line, engineered for applications demanding high speed, low power, and minimal external component count - especially in space- and power-sensitive embedded data acquisition systems.

FAQ

What is the maximum sampling rate supported by the AD7492BRU?

The AD7492BRU supports 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 maximum conversion time of 880 ns and a minimum acquisition time of 120 ns, enabling real-time digitization of signals with up to 500 kHz bandwidth. The AD7492BRU datasheet confirms this rating in Table 2 under "AD7492/AD7492-4" specifications.

Does the AD7492BRU require an external reference voltage?

No, the AD7492BRU does not require an external reference voltage. It integrates a precision 2.5 V reference with ±1.5% initial accuracy over temperature, available at the REF OUT pin. This internal reference sets the full-scale analog input range (0 V to 2.5 V) and eliminates the need for external reference components - a key feature confirmed in the General Description, Product Highlights, and Electrical Specifications sections of the AD7492BRU datasheet.

How does the PS/FS pin affect power consumption in the AD7492BRU?

The PS/FS pin on the AD7492BRU selects between two hardware-defined sleep modes: tying it high enables partial sleep (250 μA max quiescent current), retaining internal reference and clock stability; tying it low enables full sleep (1 μA max, 200 nA typical), powering down all analog circuitry. This configuration occurs automatically when CONVST remains low after conversion completion, as detailed in the Pin Function Descriptions and Operating Modes sections of the AD7492BRU datasheet.

Can the AD7492BRU interface directly with a 3 V microcontroller?

Yes, the AD7492BRU can interface directly with a 3 V microcontroller using its VDRIVE pin. By supplying 3 V to VDRIVE, the digital I/O thresholds (VINH/VINL) and output high level (VOH) are scaled accordingly - ensuring compatible logic levels while allowing AVDD/DVDD to remain at 5 V for optimal ADC dynamic performance. This dual-supply flexibility is explicitly documented in the Logic Inputs/Outputs specifications and Functional Block Diagram of the AD7492BRU datasheet.

What package type is used for the AD7492BRU, and is it RoHS compliant?

The AD7492BRU is packaged in a 24-lead TSSOP (Thin Shrink Small Outline Package) with JEDEC MO-153 outline, measuring 7.8 mm × 4.4 mm. It is RoHS compliant and lead-free, as confirmed in Analog Devices' official ordering guide and packaging information for the AD7492 family. The "BRU" suffix specifically denotes the TSSOP package variant, distinct from "BRZ" (SOIC) and "BCP" (chip-scale) options.