Analog Devices Inc. AD7862ARSZ-3REEL

Overview

AD7862ARSZ-3REEL from Analog Devices is a dual 12-bit simultaneous-sampling analog-to-digital converter (ADC) with four analog inputs (VA1/VA2/VB1/VB2), ±2.5 V input range, 3.6 µs conversion time, and high-speed parallel interface. It preserves phase coherence between channels for AC motor control and data acquisition systems requiring synchronized sampling.

For engineers reviewing the AD7862ARSZ-3REEL datasheet, AD7862ARSZ-3REEL pinout, AD7862ARSZ-3REEL application, or AD7862ARSZ-3REEL equivalent, this page delivers verified specifications, validated pin functions, confirmed alternative parts, and real-world use context - all grounded in Analog Devices' official AD7862 Rev. 0 documentation.

Technical Context

The AD7862ARSZ-3REEL integrates two independent 4 µs successive approximation ADCs, each paired with a track-and-hold amplifier, enabling true simultaneous sampling of two analog channels (A and B). Its internal +2.5 V reference and laser-trimmed clock oscillator eliminate external timing components.

Conversion is triggered by a single CONVST falling edge, placing both track/holds into hold mode simultaneously; BUSY goes high and remains asserted for 3.6 µs before indicating completion. Data is read via 12-bit parallel bus (DB0–DB11) using CS and RD controls, with A0 selecting channel pair (VA1/VA2 or VB1/VB2) for sequential reads.

Key Specifications

Pinout & Package

AD7862ARSZ-3REEL is housed in a 28-lead Shrink Small Outline Package (SSOP), RoHS-compliant, with 0.65 mm lead pitch and exposed pad for thermal management. Pin 1 is marked by a dot; pins 1 and 28 are NC (no connect).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel simultaneous-sampling ADC applications.

Compared with AD7862ARSZ-3REEL, AD7863ARSZ-3REEL offers higher resolution but identical footprint and timing, while ADS8325IPW trades parallel speed and simultaneity for serial simplicity and extended resolution - neither is pin-compatible, but both serve adjacent design constraints.

Availability

AD7862ARSZ-3REEL is available at Aetrix Electronics and suitable for AC motor control, uninterruptible power supplies, and data acquisition systems requiring stable component supply, long-term obsolescence planning, and traceable sourcing from authorized channels.

Supply support for AD7862ARSZ-3REEL 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, founded in 1965 and headquartered in Wilmington, MA.

The AD7862 belongs to Analog Devices' precision data acquisition product line, engineered specifically for industrial and instrumentation applications demanding synchronized multi-channel sampling, robust overvoltage tolerance, and single-supply operation.

FAQ

What is the maximum analog input voltage the AD7862ARSZ-3REEL can tolerate without damage?

The AD7862ARSZ-3REEL provides ±7 V overvoltage protection on its ±2.5 V analog inputs (VA1/VA2/VB1/VB2). This means it withstands transient excursions up to +7 V or –7 V relative to AGND without latch-up or permanent damage - a key reliability feature for industrial environments with noisy power rails or inductive kickback. This rating is explicitly specified in the Absolute Maximum Ratings table of the AD7862 datasheet Rev. 0.

Does the AD7862ARSZ-3REEL require an external reference, or does it include an internal one?

The AD7862ARSZ-3REEL includes an internal +2.5 V reference with ±10 mV initial error at +25°C and ±25 mV total error over temperature. The VREF pin (Pin 19) serves as both output and input: connecting a 0.1 µF capacitor to AGND enables internal reference use, while applying an external +2.5 V source (e.g., AD780) overrides it. No external reference is required for standard operation of AD7862ARSZ-3REEL.

How does the AD7862ARSZ-3REEL handle simultaneous sampling of two channels?

The AD7862ARSZ-3REEL achieves true simultaneous sampling using two independent track-and-hold amplifiers triggered by a single CONVST falling edge. Both amplifiers enter hold mode at the same instant (aperture delay matching ≤200 ps), preserving phase relationships between VA and VB channel pairs. Conversion proceeds in parallel, and results are made available after 3.6 µs - a capability confirmed in the Functional Block Diagram and General Description sections of the AD7862 datasheet.

What package type and lead count does the AD7862ARSZ-3REEL use?

The AD7862ARSZ-3REEL is packaged in a 28-lead Shrink Small Outline Package (SSOP), designated RS-28 in Analog Devices' Ordering Guide. It features a 0.65 mm lead pitch, gull-wing leads, and a RoHS-compliant finish. Pins 1 and 28 are no-connect (NC), and the package includes two AGND pins (16 and 27) for optimal analog grounding - details confirmed in the Pin Configuration diagram and Ordering Guide of the AD7862 datasheet.

Can the AD7862ARSZ-3REEL operate from a single +5 V supply?

Yes, the AD7862ARSZ-3REEL operates exclusively from a single +5 V ±5% supply (VDD, Pin 24). It integrates analog and digital circuitry on one die with shared VDD, eliminating need for separate analog/digital rails. Total supply current is 15 mA max in normal mode and drops to 25 µA in standby - enabling compact, low-component-count designs as stated in the Power Requirements section of the AD7862 datasheet Rev. 0.