Analog Devices Inc. AD7492BR

Overview

AD7492BR from Analog Devices is a 12-bit, 1 MSPS successive approximation ADC with internal 2.5 V reference and on-chip clock oscillator, operating from a single 2.7 V to 5.25 V supply. It features no pipeline delay, 70 dB typical SNR at 100 kHz input, and 880 ns max conversion time - used in high-speed data acquisition systems requiring precise timing control and low power.

For engineers reviewing the AD7492BR datasheet, AD7492BR pinout, AD7492BR application, or AD7492BR equivalent, key selection criteria include guaranteed no-missed-codes performance, flexible VDRIVE-level digital interface, dual sleep modes (partial/full), parallel bus timing compatibility with microprocessors/DSPs, and internal reference elimination of external component dependencies.

Technical Context

The AD7492BR 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 signaling completion after 880 ns - enabling deterministic sampling without latency uncertainty.

Its digital interface uses CS and RD to gate three-state parallel outputs (DB0–DB11), with logic levels referenced to VDRIVE (2.7 V to 5.25 V), decoupling analog supply (AVDD) from I/O voltage requirements. Sleep mode selection (PS/FS pin) controls whether reference/oscillator remain active (partial) or fully powered down (full).

Key Specifications

Pinout & Package

AD7492BR 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 SAR ADC applications.

Compared with AD7492BCPZ-REEL7, AD7492BR offers identical analog performance in a larger, more manufacturable SOIC package with proven reflow compatibility; versus ADS7822U, AD7492BR provides 5× higher throughput, parallel interface, and integrated reference - eliminating two external components and enabling deterministic timing-critical designs.

Availability

AD7492BR is available at Aetrix Electronics and suitable for industrial process monitoring, medical instrumentation, and automotive sensor interface applications requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for AD7492BR 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 AD7492BR belongs to Analog Devices' precision SAR ADC product line, engineered for applications demanding high throughput, low power, and minimal external component count - especially where deterministic timing and internal reference integration are critical.

FAQ

What is the maximum throughput rate supported by the AD7492BR?

The AD7492BR supports a maximum throughput rate of 1 MSPS, corresponding to a conversion time of 880 ns and acquisition time of 120 ns. This rate is specified over the full operating temperature range (−40°C to +85°C) and supply voltage range (2.7 V to 5.25 V). The AD7492BR achieves this performance without pipeline delay, making it suitable for time-critical sampling applications where latency predictability is essential. Note that the AD7492-5 variant supports 1.25 MSPS, but AD7492BR is rated at 1 MSPS per its datasheet revision A specifications.

Does the AD7492BR require an external reference or clock source?

No, the AD7492BR does not require an external reference or clock source. It integrates a 2.5 V ±1.5% internal reference available on the REF OUT pin and an on-chip clock oscillator. These features eliminate the need for external reference ICs and crystal oscillators, reducing system component count and PCB area. The internal reference is trimmed at wafer test and remains stable over temperature and supply variations - a key differentiator from alternatives like the ADS7822U, which requires both external reference and clock.

How does the PS/FS pin affect power consumption in the AD7492BR?

The PS/FS pin on the AD7492BR selects between two hardware-defined sleep modes: tying PS/FS to DVDD enables partial sleep (250 μA max quiescent current), retaining the internal reference and oscillator; tying it to AGND enables full sleep (1 μA max), powering down all analog circuitry. In both modes, the part wakes automatically on the next rising edge of CONVST, with wake-up times of 203 μs (partial) or 500 μs (full). This feature allows dynamic power scaling based on sampling duty cycle - critical for battery-powered AD7492BR deployments.

Can the AD7492BR interface directly with a 3 V microcontroller while using a 5 V analog supply?

Yes, the AD7492BR supports mixed-voltage interfacing via the VDRIVE pin. By applying 3 V to VDRIVE, the digital I/O thresholds (VINH/VINL) and output high level (VOH) are set to 3 V-compatible levels, while AVDD can remain at 5 V to maximize analog performance (e.g., SNR, THD). This eliminates the need for external level shifters or bus buffers. The AD7492BR datasheet confirms VDRIVE operates from 2.7 V to 5.25 V independently of AVDD/DVDD, enabling robust interoperability with diverse logic families without compromising analog accuracy.

What is the meaning of "guaranteed no missing codes" for the AD7492BR?

"Guaranteed no missing codes" means the AD7492BR will produce every possible 12-bit output code (0 to 4095) across its full input range (0 V to 2.5 V) under all specified operating conditions - including worst-case temperature (−40°C to +85°C), supply voltage (2.7 V to 5.25 V), and process variation. This is verified by testing integral nonlinearity (INL) to ±1.5 LSB max and differential nonlinearity (DNL) to +1.5/−0.9 LSB max. The guarantee ensures monotonic behavior, which is essential for closed-loop control, servo positioning, and other applications where code dropout could cause instability or erroneous decisions.