Analog Devices Inc. AD7492BRU-REEL

Overview

AD7492BRU-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, operating from a single 4.75–5.25 V supply. It delivers 70 dB typical SNR at 100 kHz input, 680 ns conversion time, and supports high-speed parallel interface with VDRIVE-level flexibility for mixed-voltage systems. It is used in precision data acquisition systems requiring low-latency, no-pipeline-delay sampling.

For engineers reviewing the AD7492BRU-REEL datasheet, AD7492BRU-REEL pinout, AD7492BRU-REEL application, or AD7492BRU-REEL equivalent, key selection considerations include throughput vs. power trade-offs (16 mW @ 1.25 MSPS), sleep-mode management (full/partial), internal reference accuracy (±1.5%), track/hold bandwidth (10 MHz), and parallel bus timing (t_CONVERT = 680 ns, t_ACQ = 120 ns).

Technical Context

The AD7492BRU-REEL implements a capacitive DAC-based SAR architecture with a track/hold amplifier supporting up to 10 MHz full-power bandwidth. Conversion is triggered by the falling edge of CONVST, with BUSY signaling completion after 680 ns - no pipeline delay or latency between sample and result availability.

It features dual sleep modes selected via PS/FS: partial sleep retains reference and oscillator (250 μA), while full sleep powers down all analog circuitry (<1 μA). The VDRIVE pin independently sets I/O logic levels (2.7–5.25 V), enabling direct interfacing with 3 V microcontrollers while AVDD/DVDD run at 5 V for optimal dynamic performance.

Key Specifications

Pinout & Package

AD7492BRU-REEL is housed in a 24-lead TSSOP package (RU suffix), 4.4 mm × 7.8 mm body, 0.65 mm pitch, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MAX1166BCAP+, AD7492BRU-REEL uniquely combines 12-bit resolution, 1.25 MSPS throughput, internal clock, internal reference, and dual sleep modes in a single TSSOP package - making it the only option among the three for high-speed, self-contained, low-power parallel ADC applications.

Availability

AD7492BRU-REEL is available at Aetrix Electronics and suitable for industrial process monitoring, medical instrumentation, test & measurement equipment, and automotive sensor interface applications requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for AD7492BRU-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD7492 product line delivers high-speed, low-power, integrated SAR ADCs optimized for space-constrained, thermally sensitive, and power-aware embedded systems where external component reduction and deterministic timing are critical design requirements.

FAQ

What is the maximum sampling rate supported by the AD7492BRU-REEL?

The AD7492BRU-REEL supports a maximum throughput rate of 1.25 MSPS, achieved with VDD = 4.75–5.25 V and specified in the AD7492-5 variant. This corresponds to a minimum conversion time of 680 ns and an acquisition time of 120 ns, enabling reliable operation in high-speed data acquisition systems. The AD7492BRU-REEL datasheet confirms this rating under full temperature range (−40°C to +85°C) and specifies no pipeline delay.

Does the AD7492BRU-REEL require an external clock source?

No, the AD7492BRU-REEL does not require an external clock source. It integrates a precision on-chip clock oscillator that drives the conversion process, eliminating the need for external timing components. This feature is explicitly documented in the Product Highlights and Functional Block Diagram of the AD7492BRU-REEL datasheet, and contributes to its "fewer peripheral components" value proposition.

What is the function of the VDRIVE pin on the AD7492BRU-REEL?

The VDRIVE pin on the AD7492BRU-REEL sets the voltage level for all digital I/O pins (DB0–DB11, CS, RD, CONVST, BUSY, PS/FS), independent of AVDD and DVDD. It accepts 2.7–5.25 V and determines logic thresholds (VINH = VDRIVE × 0.7, VINL = VDRIVE × 0.3) and output high level (VOH = VDRIVE − 0.2 V). This allows the AD7492BRU-REEL to interface directly with 3 V microcontrollers while running analog circuitry at 5 V for optimal SNR.

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

The PS/FS pin on the AD7492BRU-REEL selects between two hardware-defined sleep modes: tying it to DVDD enables partial sleep (250 μA max), retaining internal reference and oscillator; tying it to GND enables full sleep (<1 μA max), powering down all analog circuitry. Both modes activate automatically when CONVST remains low after conversion completion. This dual-mode control is confirmed in the Pin Function Descriptions and Power Requirements tables of the AD7492BRU-REEL datasheet.

Is the AD7492BRU-REEL pin-compatible with other variants in the AD7492 family?

Yes, the AD7492BRU-REEL shares identical pinout and package (24-lead TSSOP) with AD7492, AD7492-4, and AD7492-5 variants. All share the same functional block diagram, pin configuration (Figure 3), and absolute maximum ratings. However, performance parameters differ: AD7492BRU-REEL is the AD7492-5 variant rated for 1.25 MSPS, whereas AD7492 operates at 1 MSPS and AD7492-4 at 400 kSPS - electrical compatibility is maintained, but speed grade is variant-specific.