Analog Devices Inc. AD7863ARSZ-2REEL

Overview

AD7863ARSZ-2REEL 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, 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 AD7863ARSZ-2REEL datasheet, AD7863ARSZ-2REEL pinout, AD7863ARSZ-2REEL application, or AD7863ARSZ-2REEL equivalent, key selection criteria include simultaneous sampling capability, aperture delay matching (<350 ps), bipolar ±2.5 V input compliance, parallel 14-bit interface timing, and low-power operation (70 mW typical).

Technical Context

The AD7863ARSZ-2REEL integrates two independent successive approximation register (SAR) ADCs with matched track-and-hold amplifiers, enabling true simultaneous sampling across two channels (A and B), each with dual inputs (VA1/VA2, VB1/VB2). Its internal 2.5 V reference and laser-trimmed oscillator eliminate external clock dependencies.

Conversion is initiated by a falling edge on CONVST, triggering both track/holds into hold mode and starting concurrent conversions. Results are read via a 14-bit parallel bus (DB0–DB13) using CS and RD strobes, with BUSY indicating completion; first read returns VA1/VB1, second read returns VA2/VB2 based on A0 state.

Key Specifications

Pinout & Package

AD7863ARSZ-2REEL is housed in a 28-lead SOIC_W (Wide) package (body width 7.5 mm), RoHS-compliant, with exposed pad not electrically connected. Pin layout optimized for analog/digital ground separation and decoupling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7863ARSZ-2REEL, AD7656ASTZ offers greater resolution and channel density but demands SPI firmware integration and external reference design, whereas ADS8556IPMR provides faster sampling and more channels yet mandates ±10 V signal conditioning - making AD7863ARSZ-2REEL optimal for cost-sensitive, space-constrained ±2.5 V simultaneous-sampling applications.

Availability

AD7863ARSZ-2REEL is available at Aetrix Electronics and suitable for motor control feedback, power quality monitoring, and industrial data acquisition requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD7863ARSZ-2REEL 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 AD7863 product line delivers dual-channel simultaneous-sampling ADCs for precision industrial measurement where phase coherence, low power, and single-supply operation are critical - targeting motor control, energy metering, and automated test equipment.

FAQ

What is the input voltage range supported by the AD7863ARSZ-2REEL?

The AD7863ARSZ-2REEL supports a bipolar ±2.5 V analog input range, compliant with the AD7863-3 variant specification. This range is factory-configured and cannot be reconfigured in-circuit. Input overvoltage tolerance is ±7 V, protecting against transient spikes without damage. The device does not support ±10 V or 0 V to 2.5 V ranges - those require AD7863-10 or AD7863-2 variants respectively.

Does the AD7863ARSZ-2REEL include an internal voltage reference?

Yes, the AD7863ARSZ-2REEL integrates a 2.5 V internal reference with ±10 mV accuracy at 25°C and a 25 ppm/°C temperature coefficient. The VREF pin serves as both output and input: it sources the internal reference by default, but accepts an external 2.5 V reference if required. No external reference IC is needed for standard operation, simplifying layout and reducing BOM count.

How does simultaneous sampling work on the AD7863ARSZ-2REEL?

Simultaneous sampling on the AD7863ARSZ-2REEL is achieved via two matched track-and-hold amplifiers triggered by a single CONVST falling edge. Both amplifiers enter hold mode at the same instant, capturing VA1/VA2 or VB1/VB2 (selected by A0) with ≤350 ps aperture delay mismatch. This preserves relative phase information essential for vector calculations, unlike multiplexed ADCs that introduce time skew between channels.

What is the maximum achievable sampling rate per channel for the AD7863ARSZ-2REEL?

The AD7863ARSZ-2REEL achieves 175 kSPS per channel in Mode 1 (high-speed sampling), limited by its 5.2 μs conversion time and 400 ns quiet time before the next CONVST pulse. This rate is sustained continuously under specified conditions (VDD = 5 V ±5%, TA = −40°C to +85°C). In Mode 2 (auto-sleep), throughput drops to 100 kSPS due to 10.0 μs effective conversion time including wake-up latency.

Can the AD7863ARSZ-2REEL interface directly with a 3.3 V microcontroller?

No - the AD7863ARSZ-2REEL uses 5 V TTL-compatible logic levels: VIH = 2.4 V min, VIL = 0.8 V max, and VOH = 4.0 V min at 200 μA. Direct connection to a 3.3 V microcontroller risks violating the AD7863ARSZ-2REEL's absolute maximum input voltage (VDD + 0.3 V = 5.3 V) and may cause unreliable RD/CS recognition. A level-shifter or 5 V-tolerant MCU GPIO is required for safe interoperability.