Analog Devices Inc. AD7862ARS-2

Overview

AD7862ARS-2 from Analog Devices is a dual 12-bit simultaneous-sampling analog-to-digital converter (ADC) with four analog inputs (VA1/VA2/VB1/VB2), unipolar 0 V to +2.5 V input range, 3.6 µs conversion time, and integrated +2.5 V reference. It preserves phase coherence between channel pairs and targets precision data acquisition in motor control and power monitoring systems.

For engineers reviewing the AD7862ARS-2 datasheet, AD7862ARS-2 pinout, AD7862ARS-2 application, or AD7862ARS-2 equivalent, this page delivers verified specifications, validated pin functions, confirmed unipolar operation mode, real-world timing constraints (tCONV = 3.6 µs, tACQ = 0.3 µs), and accurate alternative part comparisons for industrial embedded design.

Technical Context

The AD7862ARS-2 implements two independent successive-approximation ADCs with matched track-and-hold amplifiers, enabling true simultaneous sampling of two analog channels (A and B), each with two inputs. Aperture delay matching is ≤200 ps, ensuring sub-degree phase alignment for synchronized signal capture.

It uses an internal laser-trimmed clock oscillator and supports high-speed parallel readout via 12-bit TTL-compatible outputs (DB0–DB11), controlled by CONVST, RD, CS, and A0 signals. The device operates in single +5 V supply mode with automatic power-down after conversion, consuming 60 mW typical.

Key Specifications

Pinout & Package

AD7862ARS-2 is housed in a 28-pin Shrink Small Outline Package (SSOP, RS-28) with 0.65 mm lead pitch and exposed thermal pad (not electrically connected). Package dimensions: 10.2 mm × 5.3 mm × 1.75 mm (L × W × H).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7862ARS-2, AD7862AR-2 offers identical performance in a larger SOIC package suitable for prototyping or lower-density boards, while AD7863ARS-2 delivers 2 extra bits at the cost of increased layout sensitivity and reference dependency - making AD7862ARS-2 optimal for cost-sensitive, space-constrained industrial DAQ where 12-bit fidelity suffices.

Availability

AD7862ARS-2 is available at Aetrix Electronics and suitable for motor control systems, uninterruptible power supplies, and industrial data acquisition requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for AD7862ARS-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 Wilmington, MA.

The AD7862 product line was designed specifically for high-accuracy, simultaneous-sampling data acquisition in real-time industrial control systems - emphasizing aperture matching, integrated reference, and robust unipolar/bipolar input flexibility.

FAQ

What is the input voltage range supported by the AD7862ARS-2?

The AD7862ARS-2 supports a unipolar analog input range of 0 V to +2.5 V on all four inputs (VA1, VA2, VB1, VB2). This is distinct from the AD7862-10 (±10 V) and AD7862-3 (±2.5 V) variants. Input current is limited to 500 nA max, enabling direct connection to high-impedance sources without buffering.

Does the AD7862ARS-2 require an external reference voltage?

No, the AD7862ARS-2 includes an internal +2.5 V reference with ±10 mV accuracy at +25°C and ±25 mV over its full operating temperature range (–40°C to +85°C). A 0.1 µF ceramic capacitor from VREF to AGND is required for stability. An external reference may be used if tighter tolerance or system-level synchronization is needed.

How does the AD7862ARS-2 handle simultaneous sampling across its two channels?

The AD7862ARS-2 uses two matched track-and-hold amplifiers triggered simultaneously by the falling edge of CONVST. Aperture delay matching is ≤200 ps, ensuring phase coherence between sampled signals on Channel A (VA1/VA2) and Channel B (VB1/VB2). This allows accurate vector calculations in motor control and power quality analysis.

What is the data output coding format for the AD7862ARS-2?

The AD7862ARS-2 outputs straight (natural) binary code on DB11–DB0, unlike the two's complement format used by AD7862-10 and AD7862-3. For a 0 V input, the output is 0x000; for full-scale +2.5 V, it is 0xFFF (4095 decimal). This simplifies firmware interpretation in unipolar sensor applications.

Can the AD7862ARS-2 operate from a single +5 V supply?

Yes, the AD7862ARS-2 operates from a single +5 V ±5% supply (VDD) applied to pin 24. It integrates both analog and digital circuitry on one die, drawing 15 mA max in normal mode (75 mW max power dissipation) and entering auto-sleep mode between conversions to reduce average power to ~75 µW.