Analog Devices Inc. AD7863ARS-10

Overview

AD7863ARS-10 from Analog Devices is a dual-channel, simultaneous-sampling 14-bit analog-to-digital converter (ADC) with ±10 V input range, 5.2 μs conversion time, and single 5 V supply operation. It integrates two track/hold amplifiers, internal 2.5 V reference, and high-speed parallel interface - designed for precision phase-coherent acquisition in motor control, power quality monitoring, and industrial data acquisition systems.

For engineers reviewing the AD7863ARS-10 datasheet, AD7863ARS-10 pinout, AD7863ARS-10 application, or AD7863ARS-10 equivalent, key selection criteria include simultaneous sampling capability, aperture delay matching (<350 ps), channel-to-channel isolation (−86 dB), and support for ±17 V overvoltage protection on analog inputs.

Technical Context

The AD7863ARS-10 implements two independent successive approximation register (SAR) ADCs sharing a common CONVST trigger to enforce strict simultaneity. Each channel (A/B) comprises two analog inputs (VA1/VA2 or VB1/VB2) selected via A0, enabling synchronized sampling of differential or complementary signal pairs.

Its internal 2.5 V reference drives both ADCs with ±10 mV error at 25°C and 25 ppm/°C tempco; analog inputs feature 9 kΩ input resistance and ±17 V absolute maximum rating. Conversion results are output via 14-bit parallel bus (DB0–DB13) with TTL-compatible timing, requiring CS/RD handshaking and BUSY status polling.

Key Specifications

Pinout & Package

AD7863ARS-10 is housed in a 28-lead SOIC_W (Wide) package with 0.3 inch body width and standard 1.27 mm pitch. Pin layout supports compact PCB routing with separate AGND/DGND planes and dedicated VREF decoupling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7863ARS-10, AD7865-10 offers more channels but sacrifices speed and interface flexibility, while ADS8556IPM delivers superior resolution and throughput at the cost of power efficiency and package size - making AD7863ARS-10 optimal for space-constrained, 175 kSPS dual-channel industrial systems.

Availability

AD7863ARS-10 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 AD7863ARS-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 SAR ADC product line, engineered for applications demanding phase-coherent multichannel acquisition in industrial automation, energy metering, and test instrumentation.

FAQ

What is the maximum sampling rate supported by the AD7863ARS-10?

The AD7863ARS-10 achieves a sustained throughput of 175 kSPS per channel in Mode 1 operation. This is enabled by its 5.2 μs conversion time and 400 ns quiet time requirement between conversions. The part maintains full 14-bit DC and dynamic specifications (e.g., 77 dB SNR, −82 dB THD) at this rate when operated within specified supply (5 V ±5%) and temperature (−40°C to +85°C) conditions. AD7863ARS-10 does not support oversampling modes or variable-rate sequencing.

Does the AD7863ARS-10 require an external reference voltage?

No, the AD7863ARS-10 includes a laser-trimmed internal 2.5 V reference with ±10 mV error at 25°C and ±20 mV max over temperature. It is fully functional with this reference when two 0.1 μF ceramic capacitors are placed from VREF to AGND. However, the VREF pin accepts external references (2.375 V to 2.625 V) for applications needing tighter initial accuracy or lower drift - AD7863ARS-10's gain error scales linearly with reference voltage deviation.

How does the AD7863ARS-10 handle simultaneous sampling of two input pairs?

The AD7863ARS-10 uses two physically separate track/hold amplifiers, each with matched aperture delay (<350 ps max mismatch), triggered identically by the falling edge of CONVST. When A0 is low, VA1 and VA2 are sampled; when A0 is high, VB1 and VB2 are sampled. Both conversions complete in 5.2 μs, and results are read sequentially via the 14-bit parallel bus - first read returns VA1/VB1, second read returns VA2/VB2. AD7863ARS-10 ensures phase coherence critical for vector control and spectral analysis.

What packaging and thermal specifications apply to the AD7863ARS-10?

The AD7863ARS-10 is supplied in a 28-lead SOIC_W package (width: 7.5 mm) with θJA = 71.4°C/W and θJC = 23.0°C/W. Its maximum power dissipation is 94.5 mW, resulting in a worst-case junction temperature rise of ~7.1°C above ambient at full load. The package supports standard IR reflow (220°C peak, 15 sec) and vapor-phase soldering (215°C, 60 sec). AD7863ARS-10 operates reliably from −40°C to +85°C with no derating required up to 450 mW package power limit.

Can the AD7863ARS-10 interface directly with common microcontrollers?

Yes, the AD7863ARS-10 features a standard 14-bit parallel TTL interface compatible with 80C196, TMS320C25, ADSP-210x, and MC68000 families. It uses active-low CS and RD strobes with BUSY status indication, requiring no level-shifting for 5 V logic systems. Timing parameters (e.g., 30 ns data access, 400 ns quiet time) are met using standard microcontroller wait-state configurations. AD7863ARS-10 has been validated in reference designs with these processors, including timing diagrams and interface code examples in its datasheet.