Analog Devices Inc. AD7492BR-REEL

Overview

AD7492BR-REEL 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 V to 5.25 V supply, delivers 70 dB typical SNR at 100 kHz input, and features parallel digital interface with no pipeline delay. It is used in high-speed data acquisition systems requiring low-latency sampling and minimal external components.

For engineers reviewing the AD7492BR-REEL datasheet, AD7492BR-REEL pinout, AD7492BR-REEL application, or AD7492BR-REEL equivalent, this page provides verified technical context, real-world timing behavior, power/throughput trade-offs, sleep-mode control logic, and precise analog input interface requirements - all specific to the AD7492BR-REEL variant in 24-lead SOIC package.

Technical Context

The AD7492BR-REEL implements a capacitive DAC-based SAR architecture with track/hold bandwidth up to 10 MHz and aperture jitter of 15 ps typ. Conversion is initiated on the falling edge of CONVST, with BUSY asserted for 680 ns (max), after which the 12-bit result appears on DB11–DB0 outputs under CS/RD control.

It supports flexible digital interfacing via VDRIVE (2.7 V to 5.25 V), enabling independent logic-level setting for I/O pins - e.g., AVDD/DVDD at 5 V for optimal analog performance while interfacing to 3 V microcontrollers. Sleep mode selection (partial or full) is hardware-controlled by PS/FS pin state.

Key Specifications

Pinout & Package

AD7492BR-REEL is housed in a 24-lead SOIC package (body width 0.300", JEDEC MS-013AC). Pin layout supports clean analog/digital partitioning with separate AGND/DGND, AVDD/DVDD, and dedicated VDRIVE for I/O level translation.

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+, the AD7492BR-REEL uniquely combines 1.25 MSPS parallel output, integrated 2.5 V reference, and on-chip clock in SOIC - making it the only option among the three that eliminates external timing and reference components while sustaining >1 MSPS throughput.

Availability

AD7492BR-REEL is available at Aetrix Electronics and suitable for medical ultrasound beamforming, industrial motor current monitoring, portable test equipment, and communications baseband sampling requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for AD7492BR-REEL 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 product line was designed for high-speed, low-power data acquisition in space- and power-constrained embedded systems - emphasizing integration (reference, clock), timing determinism (no pipeline), and flexible I/O (VDRIVE).

FAQ

What is the maximum sampling frequency supported by the AD7492BR-REEL?

The AD7492BR-REEL supports a maximum throughput rate of 1.25 MSPS, corresponding to a Nyquist frequency of 625 kHz. This is achieved using its internal clock oscillator; no external clock is required. The part maintains specified AC performance (e.g., 68 dB SNR min) up to 100 kHz input frequency, with full-power bandwidth rated at 10 MHz.

Does the AD7492BR-REEL require an external reference voltage?

No, the AD7492BR-REEL includes a 2.5 V internal reference with ±1.5% accuracy over temperature, available at the REF OUT pin. This reference can be used directly for the ADC's conversion or supplied to external circuitry. An external reference may be applied to REF IN only if the internal reference is disabled - but the AD7492BR-REEL does not expose a REF IN pin; it relies solely on the internal 2.5 V source.

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

The PS/FS pin selects between two sleep modes: tied high (DVDD) enables partial sleep (250 μA max), retaining reference and oscillator bias; tied low (AGND/DGND) enables full sleep (1 μA max), powering down all analog blocks. In both cases, the part wakes automatically on the next rising edge of CONVST, with wake-up times of 203 μs (partial) or 500 μs (full).

Can the AD7492BR-REEL interface directly with a 3 V microcontroller?

Yes - via the VDRIVE pin. By supplying 3 V to VDRIVE, the AD7492BR-REEL sets its digital input thresholds (VINH = 2.1 V min, VINL = 0.9 V max) and output high level (VOH = 2.8 V min) to match 3 V logic levels, while AVDD and DVDD may remain at 5 V to preserve analog performance. This eliminates external level shifters.

What is the purpose of the BUSY signal in the AD7492BR-REEL timing sequence?

The BUSY signal is a precise timing indicator: it goes high on the falling edge of CONVST and remains high for exactly 680 ns (max), then goes low to signal that the 12-bit conversion result is latched and ready for readout. Its fixed duration enables deterministic software polling or hardware-triggered RD strobing without complex timing margins.