Analog Devices Inc. AD7863ARS-2REEL7

Overview

AD7863ARS-2REEL7 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, ±2.5 V input range (AD7863-3 variant), and integrated 2.5 V reference - used in motor control feedback loops requiring phase-coherent sampling of current and voltage waveforms.

For engineers reviewing the AD7863ARS-2REEL7 datasheet, AD7863ARS-2REEL7 pinout, AD7863ARS-2REEL7 application, or AD7863ARS-2REEL7 equivalent, key selection criteria include simultaneous dual-channel acquisition timing, aperture delay matching (<350 ps), parallel interface timing compliance, and bipolar ±2.5 V input range support with overvoltage tolerance up to ±7 V.

Technical Context

The AD7863ARS-2REEL7 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 power quality analyzers.

Conversion is initiated by a falling edge on CONVST, which places both track-and-holds into hold mode and starts conversion concurrently. BUSY remains high for 5.2 μs (Mode 1), after which results are read sequentially via 14-bit parallel bus (DB0–DB13) using CS and RD strobes - supporting direct interfacing with ADSP-210x, TMS320C25, and MC68000 processors.

Key Specifications

Pinout & Package

AD7863ARS-2REEL7 is housed in a 28-lead SOIC_W (Wide) package (body width 7.5 mm), RoHS-compliant and rated for −40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7863ARS-2REEL7, AD7865-3ARSZ trades speed and interface flexibility for resolution, while ADS8364IPAG increases channel count but sacrifices guaranteed inter-pair aperture matching - making AD7863ARS-2REEL7 uniquely suited for phase-critical dual-input applications like motor control.

Availability

AD7863ARS-2REEL7 is available at Aetrix Electronics and suitable for industrial motor control, power quality monitoring, and high-precision data acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD7863ARS-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 data acquisition product line, engineered specifically for applications demanding simultaneous multi-channel sampling with minimal inter-channel timing skew and robust industrial operating margins.

FAQ

What is the input voltage range supported by AD7863ARS-2REEL7?

The AD7863ARS-2REEL7 is the AD7863-3 variant, configured for a bipolar ±2.5 V analog input range. This range is optimized for signal processing applications where full-scale signals align with common op-amp output levels. Overvoltage protection allows inputs to reach ±7 V without damage, enhancing robustness in noisy industrial environments. The part's internal scaling circuitry ensures accurate digitization across this range with specified relative accuracy of ±2 LSB.

How does AD7863ARS-2REEL7 achieve simultaneous sampling across two channels?

AD7863ARS-2REEL7 achieves true simultaneous sampling using two independent track-and-hold amplifiers that respond identically to the falling edge of the CONVST signal. Both amplifiers enter hold mode at the same instant, freezing their respective input voltages (e.g., VA1 and VA2) with aperture delay matching ≤350 ps. This hardware-level synchronization preserves phase relationships between sampled signals - a requirement not met by time-interleaved or sequentially triggered dual-ADC architectures.

Can AD7863ARS-2REEL7 operate with an external reference?

Yes, AD7863ARS-2REEL7 supports external reference configuration via the VREF pin. While it includes an internal 2.5 V reference (±10 mV @ 25°C, 25 ppm/°C tempco), connecting a higher-precision external reference (e.g., ADR441) to VREF overrides the internal source. The pin accepts 2.375 V to 2.625 V inputs and draws ≤±100 μA. Using an external reference improves full-scale accuracy but requires careful decoupling and layout to avoid noise injection into the analog signal path.

What is the function of the A0 pin on AD7863ARS-2REEL7?

The A0 pin on AD7863ARS-2REEL7 is a static multiplexer select input that determines which pair of analog inputs is sampled during the next conversion cycle. When A0 is low at the time of CONVST assertion, the device samples VA1 and VA2; when A0 is high, it samples VB1 and VB2. This allows flexible routing of four analog inputs across two simultaneously sampled channels without reconfiguring hardware connections - essential for applications like dual-axis motion control or differential sensor pairs.

Does AD7863ARS-2REEL7 support power-down mode, and how is it activated?

Yes, AD7863ARS-2REEL7 supports automatic power-down mode (Mode 2), reducing supply current to 20 μA max at 25°C. This mode activates automatically after conversion completion when no further RD or CS activity occurs - eliminating need for explicit control signals. Wake-up occurs on the rising edge of CONVST, with total effective conversion time increasing to 10.0 μs (including wake-up). This feature significantly lowers average power in burst-mode acquisition systems such as portable power analyzers.