Analog Devices Inc. AD7863AR-2

Overview

AD7863AR-2 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, and supports unipolar 0 V to 2.5 V input range with straight binary output coding-designed for precision motor control feedback and real-time power quality monitoring where phase coherence between voltage and current channels is critical.

For engineers reviewing the AD7863AR-2 datasheet, AD7863AR-2 pinout, AD7863AR-2 application, or AD7863AR-2 equivalent, key selection considerations include simultaneous sampling capability, aperture delay matching (<350 ps), ±14 LSB unipolar offset error match, 77 dB SNR at 80 kHz, and SOIC_W 28-lead package compatibility with industrial signal acquisition systems.

Technical Context

The AD7863AR-2 integrates two independent successive approximation ADCs, each paired with a track-and-hold amplifier and sharing a common internal 2.5 V reference. Its dual-channel architecture enables true simultaneous sampling of VA1/VA2 or VB1/VB2 via A0 multiplexer select, preserving inter-channel phase integrity for vector-controlled drives and synchronized waveform capture.

Conversion is initiated by a falling edge on CONVST, triggering both track-and-holds into hold mode and starting parallel 5.2 μs conversions. Data is read via 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-enabling deterministic timing in real-time control loops.

Key Specifications

Pinout & Package

AD7863AR-2 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 lead pitch, RoHS-compliant, with exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7863AR-3 and AD7656ASTZ, the AD7863AR-2 provides optimal balance of unipolar input compatibility, minimal power, and straightforward parallel bus integration-making it ideal for cost-sensitive, space-constrained dual-channel control applications where 14-bit resolution suffices.

Availability

AD7863AR-2 is available at Aetrix Electronics and suitable for motor control feedback, power quality monitoring, and industrial PLC analog input modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD7863AR-2 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 product line delivers high-speed, low-power, simultaneous-sampling ADCs for real-time control and measurement systems-designed specifically for applications demanding precise inter-channel timing, such as vector motor drives and synchronized waveform analysis.

FAQ

What input voltage range does the AD7863AR-2 support?

The AD7863AR-2 supports a unipolar 0 V to 2.5 V analog input range. This matches common sensor outputs and DAC references in single-supply systems. Overvoltage protection allows inputs up to +7 V without damage. The AD7863AR-2 uses straight (natural) binary output coding, unlike the two's complement format used in AD7863AR-10 and AD7863AR-3 variants.

How does simultaneous sampling work on the AD7863AR-2?

Simultaneous sampling on the AD7863AR-2 is achieved through two independent track-and-hold amplifiers triggered by the same CONVST falling edge. When CONVST goes low, both amplifiers freeze their respective input voltages (VA1/VA2 or VB1/VB2) at precisely the same instant-preserving phase coherence. Aperture delay matching is guaranteed ≤350 ps, ensuring sub-degree timing alignment at 100 kHz.

What is the conversion time and maximum sampling rate of the AD7863AR-2?

The AD7863AR-2 achieves a 5.2 μs conversion time in Mode 1 (high-speed mode), enabling a maximum sustained sampling rate of 175 kSPS per channel. This allows full-scale sine wave capture up to 87.5 kHz while meeting Nyquist criteria. The device also supports Mode 2 (auto-sleep), extending conversion time to 10.0 μs but reducing power consumption to 105 μW maximum.

Does the AD7863AR-2 require an external reference voltage?

No, the AD7863AR-2 includes an internal 2.5 V reference with ±10 mV accuracy at 25°C and 25 ppm/°C temperature coefficient. The VREF pin serves as both output and input-allowing use of the internal reference or replacement with a higher-precision external source. When using the internal reference, two 0.1 μF ceramic capacitors must be placed from VREF to AGND for stability.

Which package type is used for the AD7863AR-2?

The AD7863AR-2 is supplied in a 28-lead SOIC_W (Wide-body Small Outline IC) package, measuring 17.9 mm × 7.5 mm with 1.27 mm lead pitch. This surface-mount package supports automated assembly and provides adequate thermal dissipation for its 45 mW typical power dissipation. Pin compatibility is maintained across all AD7863 variants in this package option.