Analog Devices Inc. AD7863BR-3

Overview

AD7863BR-3 from Analog Devices is a dual-channel, simultaneous-sampling 14-bit analog-to-digital converter optimized for phase-critical signal acquisition in motor control and power quality monitoring. It delivers 175 kSPS throughput per channel, ±2.5 V input range, 5.2 μs conversion time, and integrated 2.5 V reference - enabling accurate capture of synchronized voltage/current waveforms in real-time embedded systems.

For engineers reviewing the AD7863BR-3 datasheet, AD7863BR-3 pinout, AD7863BR-3 application, or AD7863BR-3 equivalent, key selection criteria include simultaneous sampling capability, aperture delay matching (<350 ps), bipolar ±2.5 V input compliance, parallel interface timing (t_CONV = 5.2 μs), and low-power operation (70 mW typical) in industrial temperature range (−40°C to +85°C).

Technical Context

The AD7863BR-3 integrates two independent successive-approximation ADCs with matched track-and-hold amplifiers, enabling true simultaneous sampling across VA1/VA2 or VB1/VB2 pairs. Its internal 2.5 V reference (±10 mV at 25°C, 25 ppm/°C TC) directly supports the ±2.5 V input range without external scaling.

Conversion is triggered by a single CONVST falling edge, initiating hold and conversion on both channels concurrently; BUSY goes high and remains asserted for 5.2 μs before data becomes available via 14-bit parallel bus (DB0–DB13). Data read sequence depends on A0 state: first RD fetches VA1/VB1, second fetches VA2/VB2.

Key Specifications

Pinout & Package

AD7863BR-3 is housed in a 28-lead SOIC_W (Wide-body Small Outline IC) package, RoHS-compliant, with 1.27 mm lead pitch and exposed thermal pad option per manufacturer documentation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7863BR-3, AD7656ASTZ offers higher resolution and channel density but lacks native ±2.5 V support and adds SPI protocol overhead, while ADS8588SIPM provides more channels but sacrifices true simultaneity and bipolar input capability - making AD7863BR-3 uniquely suited for cost-sensitive, phase-critical dual-input industrial control.

Availability

AD7863BR-3 is available at Aetrix Electronics and suitable for motor control systems, power quality analyzers, industrial PLC analog input modules, and portable energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7863BR-3 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.

The AD7863 product line was developed specifically for high-fidelity, phase-coherent data acquisition in industrial automation and energy systems - emphasizing simultaneous sampling, robust input protection, and low-power operation in harsh environments.

FAQ

What is the maximum analog input voltage the AD7863BR-3 can tolerate without damage?

The AD7863BR-3 features overvoltage protection rated to ±7 V on all analog inputs (VA1, VA2, VB1, VB2) relative to AGND. This allows transient surges common in industrial motor drive and grid-monitoring applications to be absorbed without latch-up or permanent damage, provided supply voltages remain within absolute maximum ratings.

Does the AD7863BR-3 require an external reference, or does it include an internal one?

The AD7863BR-3 includes a precision internal 2.5 V reference (±10 mV at 25°C, ±20 mV over temperature) that directly supports its ±2.5 V input range. The VREF pin serves as both output and input - users may bypass the internal reference by applying a 2.375–2.625 V external source for tighter accuracy, but it is not required for basic operation of AD7863BR-3.

How does the AD7863BR-3 achieve simultaneous sampling across two channels?

The AD7863BR-3 achieves true simultaneous sampling using two matched track-and-hold amplifiers, both triggered by the same falling edge of the CONVST signal. Aperture delay matching is guaranteed ≤350 ps, ensuring phase information between VA1/VA2 or VB1/VB2 is preserved - a critical requirement for vector control and power measurement where relative timing determines accuracy.

What is the function of the A0 pin on the AD7863BR-3, and how does it affect data reading?

The A0 pin selects the active analog channel pair: low selects VA1/VA2, high selects VB1/VB2. This selection is latched at the CONVST falling edge and determines read order - the first RD cycle after conversion returns the result from VA1 or VB1, and the second RD returns VA2 or VB2. A0 must remain stable during conversion; changing it mid-sequence invalidates data alignment in AD7863BR-3.

Can the AD7863BR-3 operate from a single 5 V supply, and what are its power consumption characteristics?

Yes, the AD7863BR-3 operates from a single 5 V ±5% supply (VDD). In normal Mode 1 operation, it draws 16 mA max (84 mW max), with typical dissipation of 70 mW. In auto-sleep Mode 2, supply current drops to 20 μA max (105 μW max), making AD7863BR-3 suitable for battery-backed or energy-conscious industrial instrumentation.