Analog Devices Inc. AD7862ARZ-10

Overview

AD7862ARZ-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 on-chip +2.5 V reference. It preserves phase coherence between channels for AC motor control and power quality monitoring.

For engineers reviewing the AD7862ARZ-10 datasheet, AD7862ARZ-10 pinout, AD7862ARZ-10 application, or AD7862ARZ-10 equivalent, this page delivers verified specifications, real-world timing behavior, channel-isolation performance, aperture delay matching, and parallel interface timing constraints critical for high-fidelity data acquisition system design.

Technical Context

The AD7862ARZ-10 integrates two independent successive-approximation ADCs, each paired with a track-and-hold amplifier, enabling true simultaneous sampling of VA1/VA2 or VB1/VB2. Its internal laser-trimmed clock eliminates external timing components and ensures 250 kSPS throughput with 3.6 µs conversion time per dual-channel cycle.

It uses a single +5 V supply and features twos-complement output coding, 12-bit resolution with no missing codes guaranteed, ±1 LSB relative accuracy, and 70 dB SNR at 100 kHz input. Aperture delay matching of 200 ps and channel-to-channel isolation of –80 dB support precise multi-signal phase analysis in industrial control systems.

Key Specifications

Pinout & Package

AD7862ARZ-10 is housed in a 28-lead SOIC (Small Outline Integrated Circuit) package with gull-wing leads, RoHS-compliant matte tin finish, and JEDEC MS-012AC footprint (body width 7.6 mm, lead pitch 1.27 mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7862ARZ-10, AD7863ARZ-10 delivers 2 extra bits of resolution at identical timing and packaging-ideal for metrology-grade upgrades-while ADS8327IPWR trades parallel simplicity and simultaneity for higher resolution and smaller size in non-synchronous use cases.

Availability

AD7862ARZ-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 assurance, and traceable sourcing.

Supply support for AD7862ARZ-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 product line was engineered specifically for industrial real-time control and power electronics applications demanding deterministic, phase-coherent dual-channel digitization without external timing complexity.

FAQ

What is the maximum sampling rate supported by the AD7862ARZ-10?

The AD7862ARZ-10 achieves a maximum throughput rate of 250 kSPS for dual-channel simultaneous sampling. This is enabled by its 3.6 µs conversion time and optimized track/hold acquisition time of 0.3 µs. To sustain this rate, the read operation must complete before the next CONVST pulse, respecting timing parameters t7 (40 ns minimum interval between consecutive reads) and avoiding overlap with BUSY assertion. The AD7862ARZ-10 does not support interleaved or pipelined modes beyond this spec.

Does the AD7862ARZ-10 require an external reference voltage?

No, the AD7862ARZ-10 includes an internal +2.5 V reference with ±10 mV initial error and 25 ppm/°C temperature coefficient, fully adequate for most industrial applications. The VREF pin can be used as an output (with 0.1 µF AGND bypass) or accept an external +2.5 V reference like the AD780 for tighter accuracy. Using the internal reference eliminates BOM cost and layout complexity while maintaining ±1 LSB relative accuracy across –40°C to +85°C.

How does the AD7862ARZ-10 handle simultaneous sampling of four inputs?

The AD7862ARZ-10 groups its four analog inputs (VA1, VA2, VB1, VB2) into two synchronized channels: Channel A (VA1/VA2) and Channel B (VB1/VB2). A single CONVST falling edge places both on-chip track/hold amplifiers into hold mode simultaneously, capturing instantaneous voltage values with 200 ps aperture delay matching. Conversion proceeds in parallel, and results are read sequentially via the 12-bit bus using A0 and RD control-ensuring phase coherence essential for vector calculations.

What is the overvoltage tolerance on the analog inputs of the AD7862ARZ-10?

The AD7862ARZ-10 analog inputs tolerate up to ±17 V continuously without damage, exceeding its ±10 V specified input range. This robustness stems from integrated input protection circuitry designed for industrial environments with relay switching, inductive kickback, and ESD events. Operation outside ±10 V will saturate the ADC but will not degrade performance or reliability when returned within range, making it suitable for systems with unpredictable transient exposure.

Can the AD7862ARZ-10 interface directly with a microcontroller's parallel bus?

Yes, the AD7862ARZ-10 features a standard TTL-compatible 12-bit parallel interface with active-low CS and RD control signals, designed for direct connection to microcontrollers including 8051, ARM Cortex-M3/M4, and TI C2000 series. Its timing parameters (e.g., t5 = 60 ns data access, t6 = 30 ns bus relinquish) align with common MCU bus cycles. No level-shifting or timing glue logic is required when VDD = +5 V and MCU I/O tolerates 5 V inputs.