Analog Devices Inc. AD7863AR-10

Overview

AD7863AR-10 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, ±10 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 AD7863AR-10 datasheet, AD7863AR-10 pinout, AD7863AR-10 application, or AD7863AR-10 equivalent, key selection criteria include simultaneous sampling capability, aperture delay matching (<350 ps), channel-to-channel isolation (−86 dB), and support for high-speed parallel microprocessor interfacing without external clocking.

Technical Context

The AD7863AR-10 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 control, preserving inter-channel phase integrity for synchronized waveform capture.

Conversion is initiated by a falling edge on CONVST, triggering both track/holds into hold mode and starting concurrent conversions. BUSY goes high at that edge and remains asserted for 5.2 μs, after which results are read sequentially over a 14-bit parallel bus using CS and RD - first access returns VA1/VB1, second returns VA2/VB2.

Key Specifications

Pinout & Package

AD7863AR-10 is housed in a 28-lead SOIC_W (Wide) package with 0.6 mm lead pitch and exposed thermal pad. Pin layout supports standard PCB routing for high-speed parallel data buses and separate analog/digital ground partitioning.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7863AR-10, AD7656ASTZ offers higher resolution and channel count but demands additional reference and interface circuitry, while ADS8556IPM provides greater speed and channel density at the cost of increased power and loss of integrated reference - making AD7863AR-10 optimal for compact, low-power, ±10 V dual-channel systems with minimal BOM.

Availability

AD7863AR-10 is available at Aetrix Electronics and suitable for industrial motor control, power quality analyzers, and portable test equipment requiring stable component supply and long-term obsolescence management.

Supply support for AD7863AR-10 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 data acquisition portfolio, designed specifically for applications demanding phase-coherent multi-channel sampling in industrial automation and energy systems.

FAQ

What is the maximum sampling rate supported by the AD7863AR-10?

The AD7863AR-10 supports a maximum sampling rate of 175 kSPS per channel in Mode 1 operation. This rate is sustained with guaranteed 14-bit performance, including SNR ≥77 dB and THD ≤−82 dB at 80 kHz input frequency. The 5.2 μs conversion time enables deterministic timing for real-time control loops in motor drives and power converters where jitter must remain below 50 ps.

Does the AD7863AR-10 require an external reference voltage?

No, the AD7863AR-10 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 - it can be left unconnected to use the internal reference or driven by an external precision source. When using the internal reference, two 0.1 μF ceramic capacitors must be placed from VREF to AGND to ensure stability and specified dynamic performance.

How does the AD7863AR-10 handle simultaneous sampling across its two channels?

The AD7863AR-10 uses two matched track-and-hold amplifiers triggered synchronously by the falling edge of CONVST. Both amplifiers enter hold mode at the same instant, capturing VA1/VA2 or VB1/VB2 simultaneously depending on A0 state. Aperture delay matching is guaranteed ≤350 ps, ensuring phase coherence between sampled signals - essential for vector control and power factor calculation where relative timing errors must be <0.1° at 50/60 Hz.

What are the power consumption characteristics of the AD7863AR-10 in active and power-down modes?

In normal operation (Mode 1), the AD7863AR-10 draws 18 mA max from a 5 V supply, resulting in 94.5 mW max power dissipation (70 mW typical). In power-down mode (Mode 2), supply current drops to 20 μA max (40 nA typical), reducing power to 105 μW max - ideal for battery-powered DAQ systems needing periodic wake-up sampling. Power-down is automatic after conversion completion and resumes before next CONVST pulse.

Can the AD7863AR-10 interface directly with common microcontrollers like the 80C196 or MC68000?

Yes, the AD7863AR-10 features a standard high-speed parallel interface compatible with 80C196, MC68000, ADSP-210x, and TMS320C25 processors. It uses asynchronous CS/RD handshaking with 14-bit three-state TTL outputs (DB0–DB13), requiring no external clock or FIFO. Timing parameters such as t5 (30 ns data access) and t6 (5 ns bus relinquish) are fully characterized for direct connection - eliminating need for wait-state generators in most implementations.