Analog Devices Inc. AD7863AR-2REEL7

Overview

AD7863AR-2REEL7 from Analog Devices is a dual-channel, simultaneous-sampling 14-bit analog-to-digital converter (ADC) with 175 kSPS throughput per channel, ±2.5 V input range, and internal 2.5 V reference. It features two independent track-and-hold amplifiers, high-speed parallel interface (14-bit TTL), and operates from a single 5 V supply. Used in motor control feedback loops where phase coherence between voltage and current sensing is critical.

For engineers reviewing the AD7863AR-2REEL7 datasheet, AD7863AR-2REEL7 pinout, AD7863AR-2REEL7 application, or AD7863AR-2REEL7 equivalent, key selection criteria include simultaneous sampling capability, aperture delay matching (<350 ps), 5.2 μs conversion time, bipolar ±2.5 V input compatibility, and SOIC_W 28-lead package compatibility with industrial PCB layouts.

Technical Context

The AD7863AR-2REEL7 implements two independent successive approximation register (SAR) ADC cores sharing a single internal 2.5 V reference and synchronized by a common CONVST signal. Each core includes dedicated track-and-hold circuitry with matched aperture delay (≤350 ps) to preserve inter-channel phase integrity during simultaneous sampling of VA1/VA2 or VB1/VB2 pairs.

It supports Mode 1 (high-speed, 5.2 μs conversion) and Mode 2 (auto-power-down, 10.0 μs effective conversion), with TTL-compatible parallel data bus (DB0–DB13), CS/RD handshaking, and BUSY status signaling. Input scaling is fixed for ±2.5 V full-scale range, and output coding is straight binary.

Key Specifications

Pinout & Package

AD7863AR-2REEL7 is housed in a 28-lead SOIC_W (Wide-body Small Outline Integrated Circuit) package, 17.9 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 AD7863AR-2REEL7, AD7656ASTZ offers higher resolution and channel count but adds SPI protocol complexity and external reference dependency, while ADS8556IPMR delivers greater speed and input range at the cost of power, size, and cost-making AD7863AR-2REEL7 optimal for compact, cost-sensitive ±2.5 V simultaneous-sampling designs.

Availability

AD7863AR-2REEL7 is available at Aetrix Electronics and suitable for motor control feedback, industrial data acquisition, and power quality monitoring requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for AD7863AR-2REEL7 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 belongs to Analog Devices' precision high-speed SAR ADC product line, designed specifically for applications demanding simultaneous multi-channel sampling with tight inter-channel timing alignment and low power consumption.

FAQ

What input voltage range does the AD7863AR-2REEL7 support?

The AD7863AR-2REEL7 supports a bipolar ±2.5 V analog input range, with overvoltage protection up to ±7 V on all analog inputs (VA1, VA2, VB1, VB2). This range is factory-configured and cannot be reconfigured in-circuit; it differs from the ±10 V (AD7863-10) and 0 V to 2.5 V (AD7863-2) variants. The ±2.5 V range aligns with standard signal processing levels in motor control and instrumentation systems.

Does the AD7863AR-2REEL7 require an external reference?

No, the AD7863AR-2REEL7 includes an internal 2.5 V reference with ±10 mV initial error at 25°C and 25 ppm/°C temperature coefficient. It is fully functional with only two 0.1 μF ceramic capacitors from VREF to AGND. An external reference may be applied to the VREF pin if tighter accuracy or lower drift is required, but it is not necessary for baseline operation of the AD7863AR-2REEL7.

How does simultaneous sampling work on the AD7863AR-2REEL7?

Simultaneous sampling on the AD7863AR-2REEL7 is achieved via two independent track-and-hold amplifiers triggered by the falling edge of the CONVST signal. When CONVST goes low, both amplifiers enter hold mode at the same instant, freezing the analog values on either VA1/VA2 (if A0 = low) or VB1/VB2 (if A0 = high). This preserves relative phase information between the two sampled signals, with aperture delay matching guaranteed ≤350 ps.

What is the conversion time and maximum throughput of the AD7863AR-2REEL7?

The AD7863AR-2REEL7 has a conversion time of 5.2 μs in Mode 1 (high-speed mode), enabling a maximum throughput of 175 kSPS per channel. In Mode 2 (auto power-down), the effective conversion time is 10.0 μs due to wake-up latency. To sustain 175 kSPS, the system must observe a 400 ns quiet time before the next CONVST pulse and ensure read operations occur only after BUSY deasserts.

Which package and packaging format does AD7863AR-2REEL7 use?

The AD7863AR-2REEL7 uses a 28-lead SOIC_W (Wide-body Small Outline IC) package, measuring 17.9 mm × 7.5 mm with 1.27 mm lead pitch. The "REEL7" suffix indicates it is supplied in a 1000-piece tape-and-reel format compliant with EIA-481-D standards, suitable for automated SMT assembly in industrial manufacturing environments.