Analog Devices Inc. AD7492ARUZ-4REEL7

Overview

AD7492ARUZ-4REEL7 from Analog Devices is a 12-bit, 400 kSPS successive approximation ADC with internal 2.5 V reference and on-chip clock oscillator. It operates from a single 2.7 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 power and minimal external components.

For engineers reviewing the AD7492ARUZ-4REEL7 datasheet, AD7492ARUZ-4REEL7 pinout, AD7492ARUZ-4REEL7 application, or AD7492ARUZ-4REEL7 equivalent, key selection considerations include throughput rate (400 kSPS), sleep-mode current (200 nA full-sleep), VDRIVE-level flexibility for mixed-voltage interfacing, and guaranteed no-missed-codes performance over −40°C to +85°C.

Technical Context

The AD7492ARUZ-4REEL7 implements a capacitive DAC-based SAR architecture with track/hold amplifier supporting up to 10 MHz full-power bandwidth. Conversion is initiated on the falling edge of CONVST, with BUSY signaling completion after 880 ns - no latency or pipelining affects timing determinism.

It supports three operating modes: normal (15 mW at 5 V), partial sleep (250 μA), and full sleep (1 μA), selected via PS/FS pin. The VDRIVE pin independently sets I/O voltage levels (2.7–5.25 V), enabling direct interfacing with 3 V logic while AVDD/DVDD run at 5 V for optimal analog performance.

Key Specifications

Pinout & Package

AD7492ARUZ-4REEL7 is housed in a 24-lead TSSOP package (RUZ suffix), 3.5 mm × 7.8 mm body, 0.65 mm pitch, RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7492BRUZ-4, the AD7492ARUZ-4REEL7 offers lower cost and adequate linearity for most industrial monitoring tasks; versus ADS7822U, it provides higher speed, parallel interface, and integrated reference - reducing design complexity but occupying more PCB area.

Availability

AD7492ARUZ-4REEL7 is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical instrumentation, automotive sensor interface, and test & measurement equipment requiring stable component supply and long-term manufacturability.

Supply support for AD7492ARUZ-4REEL7 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 family was designed specifically for high-speed, low-power data acquisition in space- and power-constrained systems where integration of reference and clock reduces bill-of-materials and improves reliability.

FAQ

What is the maximum sampling rate of the AD7492ARUZ-4REEL7?

The AD7492ARUZ-4REEL7 is the AD7492-4 variant and has a maximum throughput rate of 400 kSPS. This is fixed by its internal clock architecture and confirmed in Table 2 of the Rev. A datasheet. Conversion time is 880 ns, and acquisition time is 120 ns, yielding a deterministic cycle time of 1.0 μs per sample. It does not support the 1 MSPS (AD7492) or 1.25 MSPS (AD7492-5) rates.

Does the AD7492ARUZ-4REEL7 require an external reference voltage?

No, the AD7492ARUZ-4REEL7 includes a 2.5 V ±1.5% internal reference available at the REF OUT pin. This reference can serve as REFIN for the ADC itself or be used externally. No external reference is needed unless a different reference voltage or tighter tolerance is required - in which case REFIN must be driven externally and REF OUT left unconnected.

How does the PS/FS pin affect power consumption in the AD7492ARUZ-4REEL7?

The PS/FS pin selects between partial sleep (logic high) and full sleep (logic low) modes. In partial sleep, current draw is ≤250 μA with reference and oscillator active; in full sleep, it drops to ≤1 μA with all analog circuitry powered down. Both modes are entered automatically when CONVST remains low after conversion completes, and wake-up is triggered by the next rising edge of CONVST.

Can the AD7492ARUZ-4REEL7 interface directly with a 3.3 V microcontroller?

Yes - set VDRIVE = 3.3 V to configure digital I/O thresholds and output high levels for compatibility with 3.3 V logic. AVDD and DVDD may remain at 5 V to preserve analog performance (SNR, THD), as VDRIVE electrically isolates the interface voltage domain. This dual-supply flexibility is explicitly supported in the datasheet's Logic Inputs and Outputs sections.

What package type and footprint does the AD7492ARUZ-4REEL7 use?

The AD7492ARUZ-4REEL7 uses a 24-lead TSSOP package (RUZ suffix), with 0.65 mm lead pitch, 3.5 mm × 7.8 mm body size, and exposed pad (no thermal pad connection required). It is RoHS-compliant and moisture sensitivity level 3. Pin 1 marking is a dot; pin numbering follows standard TSSOP convention counterclockwise from the dot.