Analog Devices Inc. AD7863ARS-3REEL7

Overview

AD7863ARS-3REEL7 from Analog Devices is a dual-channel, simultaneous-sampling 14-bit analog-to-digital converter (ADC) operating from a single 5 V supply. It delivers 175 kSPS throughput per channel with 5.2 μs conversion time, ±2.5 V input range, and integrated 2.5 V reference - enabling precise phase-coherent acquisition in motor control and power quality monitoring systems.

For engineers reviewing the AD7863ARS-3REEL7 datasheet, AD7863ARS-3REEL7 pinout, AD7863ARS-3REEL7 application, or AD7863ARS-3REEL7 equivalent, key selection criteria include simultaneous dual-channel sampling, aperture delay matching ≤350 ps, 77 dB SNR at 80 kHz, 14-bit no-missing-codes performance, and SOIC_W-28 package compatibility with industrial signal conditioning designs.

Technical Context

The AD7863ARS-3REEL7 integrates two independent successive approximation ADCs, each paired with a track-and-hold amplifier and sharing a laser-trimmed internal clock. Its dual-channel architecture supports simultaneous sampling of VA1/VA2 or VB1/VB2 via A0 multiplexer select, preserving inter-channel phase integrity for vector-controlled drives and synchronized sensor arrays.

It operates in Mode 1 (high-speed) with 5.2 μs conversion and 0.5 μs track/hold acquisition, or Mode 2 (auto-sleep) with 10.0 μs effective conversion. Input overvoltage protection tolerates ±7 V on analog pins, and the 2.5 V reference output exhibits ±20 mV max error over temperature with 25 ppm/°C drift.

Key Specifications

Pinout & Package

AD7863ARS-3REEL7 is housed in a 28-lead SOIC_W (Wide-body Small Outline Integrated Circuit) package, 10.3 mm × 7.5 mm body size, 1.27 mm pitch, RoHS-compliant, tape-and-reel format (REEL7 = 1000-piece reel).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7863ARS-3REEL7, AD7656ASTZ offers higher resolution and channel count but lacks native ±2.5 V support and parallel interface simplicity, while ADS8588SIPM provides greater flexibility and speed at the cost of increased system integration effort and external reference dependency.

Availability

AD7863ARS-3REEL7 is available at Aetrix Electronics and suitable for motor control systems, power quality analyzers, industrial data acquisition, and test & measurement equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for AD7863ARS-3REEL7 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, with design centers worldwide and ISO 9001-certified manufacturing.

The AD7863 belongs to Analog Devices' precision data acquisition product line, engineered specifically for industrial automation and energy systems demanding simultaneous sampling, robust overvoltage tolerance, and deterministic timing in harsh environments.

FAQ

What is the maximum analog input voltage the AD7863ARS-3REEL7 can withstand without damage?

The AD7863ARS-3REEL7 features overvoltage protection rated at ±7 V on all analog inputs (VA1, VA2, VB1, VB2) when configured for the ±2.5 V range. This allows transient excursions beyond the specified input range without latch-up or permanent damage, supporting robust operation in electrically noisy industrial environments. The protection remains active regardless of power state, and no external components are required to enable this feature. Always verify that AGND remains the reference for all analog signals to maintain protection integrity.

Does the AD7863ARS-3REEL7 support true simultaneous sampling across both channels?

Yes, the AD7863ARS-3REEL7 performs true simultaneous sampling: a single CONVST falling edge places both on-chip track-and-hold amplifiers into hold mode at the same instant, capturing VA1/VA2 or VB1/VB2 with aperture delay matching ≤350 ps. This preserves relative phase information between channels - a requirement verified in production test and documented in the Rev. B datasheet's "Aperture Delay Matching" specification. No external synchronization circuitry is needed to achieve this behavior.

What is the reference configuration for the AD7863ARS-3REEL7, and can it be overdriven?

The AD7863ARS-3REEL7 includes an internal 2.5 V bandgap reference accessible at the VREF pin, specified with ±20 mV max error over temperature and 25 ppm/°C drift. The pin functions as both output and input: connecting an external 2.5 V reference (e.g., ADR4525) overrides the internal source, improving gain accuracy and stability. When overdriven, the internal reference is disabled, and the external source must drive ≤5.5 kΩ load impedance. Decoupling with two 0.1 μF ceramic capacitors to AGND is mandatory for either configuration.

How does the AD7863ARS-3REEL7 handle data readout for dual-channel results?

The AD7863ARS-3REEL7 uses a sequential 14-bit parallel readout: after conversion completes and BUSY goes low, the first RD pulse (with CS low) outputs the result from VA1 or VB1 (depending on A0 state), and the second RD pulse outputs VA2 or VB2. This two-read sequence is hardwired and deterministic - no internal register addressing or command protocol is required. The DB0–DB13 bus remains valid for 30 ns after RD rising edge, and consecutive reads must be spaced ≥10 ns apart per timing specification t7.

Is the AD7863ARS-3REEL7 pin-compatible with earlier AD7862 variants?

Yes, the AD7863ARS-3REEL7 is a 14-bit lead-compatible upgrade to the AD7862, sharing identical SOIC_W-28 pinout, power supply requirements (5 V), and parallel interface signaling (CS, RD, BUSY, CONVST). However, it adds simultaneous sampling capability, improved SNR (77 dB vs. 74 dB), tighter aperture matching (350 ps vs. 500 ps), and enhanced overvoltage protection. Firmware and PCB layouts designed for AD7862 can be reused with AD7863ARS-3REEL7 without modification, though updated timing margins should be verified.