Analog Devices Inc. AD7862AN-10

Overview

AD7862AN-10 from Analog Devices is a dual 12-bit simultaneous-sampling analog-to-digital converter (ADC) with four analog inputs grouped into two synchronized channels (A and B), ±10 V input range, 3.6 µs conversion time, and 250 kSPS throughput. It preserves phase coherence between channel pairs and is used in AC motor control systems requiring precise current/voltage sampling.

For engineers reviewing the AD7862AN-10 datasheet, AD7862AN-10 pinout, AD7862AN-10 application, or AD7862AN-10 equivalent, this page delivers verified specifications, package mapping, functional pin roles, real-world use cases, and validated alternative parts - all grounded in Analog Devices' official documentation for the AD7862-10 variant in N-28 plastic DIP packaging.

Technical Context

The AD7862AN-10 integrates two independent 4 µs successive approximation ADCs, each paired with a track-and-hold amplifier, enabling true simultaneous sampling of VA1/VA2 or VB1/VB2 on falling edge of CONVST. Its internal +2.5 V reference (±10 mV @ 25°C, 25 ppm/°C TC) feeds both converters, and overvoltage protection allows analog inputs to withstand ±17 V without damage.

It uses a high-speed parallel interface with 12-bit three-state TTL outputs (DB0–DB11), controlled by CS, RD, and A0 multiplexer select. Conversion results are read sequentially: first access returns VA1 or VB1; second access returns VA2 or VB2 depending on A0 state - preserving deterministic timing for real-time control loops.

Key Specifications

Pinout & Package

AD7862AN-10 is housed in a 28-pin plastic DIP (N-28) package with 0.6-inch body width and through-hole mounting. Pin 1 is top-left corner when notch faces upward; pins 1–14 on top row, 15–28 on bottom row.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7862AN-10, AD7863AR-10 offers direct upgrade path with identical pinout and timing, while ADS8364IPAG provides greater channel count and resolution at the cost of interface and mechanical compatibility - making AD7862AN-10 optimal for cost-sensitive, space-constrained dual-channel industrial control.

Availability

AD7862AN-10 is available at Aetrix Electronics and suitable for AC motor control, uninterruptible power supplies, and industrial data acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD7862AN-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.

The AD7862 belongs to Analog Devices' precision data acquisition IC product line, designed specifically for industrial automation and real-time control applications demanding synchronized multi-channel sampling with robust noise immunity and wide input voltage tolerance.

FAQ

What is the maximum analog input voltage the AD7862AN-10 can tolerate without damage?

The AD7862AN-10 features overvoltage protection allowing analog inputs (VA1, VA2, VB1, VB2) to withstand ±17 V relative to AGND without permanent damage. This exceeds its specified ±10 V operating range and protects against transients in industrial environments. The protection is inherent to the input structure and does not require external clamping components. Always reference inputs to AGND, not DGND, to maintain integrity of this protection.

How does the AD7862AN-10 achieve simultaneous sampling across two channels?

The AD7862AN-10 achieves true simultaneous sampling using two matched track-and-hold amplifiers triggered by the same CONVST falling edge - placing both into hold mode at precisely the same instant. Aperture delay matching is specified at 200 ps typical, ensuring phase coherence between sampled signals. This architecture preserves relative timing information critical for vector calculations in motor control or power quality analysis - unlike multiplexed single-ADC solutions.

What reference voltage options are supported by the AD7862AN-10?

The AD7862AN-10 supports both internal and external reference configurations via the VREF pin. Internally, it provides a buffered +2.5 V reference (±10 mV @ 25°C, 25 ppm/°C TC). Externally, it accepts a precision +2.5 V source (e.g., AD780 or REF43) with ±100 µA input current capability. Using an external reference improves gain accuracy and temperature stability but requires proper decoupling and layout isolation from noisy digital traces.

Can the AD7862AN-10 operate from a single +5 V supply?

Yes, the AD7862AN-10 operates exclusively from a single +5 V ±5% supply (VDD) - powering both analog and digital sections. No separate AVDD or DVDD rails are needed. Typical power dissipation is 60 mW in normal mode and drops to 75 µW in auto power-down mode. This simplifies power design and reduces component count compared to dual-supply ADCs, making it ideal for compact industrial controllers.

What is the function of the A0 pin on the AD7862AN-10?

The A0 pin on the AD7862AN-10 serves as the multiplexer select control for sequential data readout. When A0 is low and CS/RD are asserted, the first read accesses VA1 (Channel A, Input 1) or VB1 (Channel B, Input 1); when A0 is high, the first read accesses VA2 or VB2. This enables deterministic, software-controlled selection of which pair of inputs (A or B) is read first - essential for time-aligned dual-channel acquisition in real-time systems.