Analog Devices Inc. AD7862ARSZ-10

Overview

AD7862ARSZ-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 high-speed parallel interface. It preserves phase coherence between channels for AC motor control and power quality monitoring.

For engineers reviewing the AD7862ARSZ-10 datasheet, AD7862ARSZ-10 pinout, AD7862ARSZ-10 application, or AD7862ARSZ-10 equivalent, this device supports real-time dual-channel acquisition in industrial automation, UPS systems, and data acquisition where timing alignment and ±10 V signal fidelity are critical.

Technical Context

The AD7862ARSZ-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 on falling edge of CONVST. Aperture delay matching is 200 ps typ, ensuring sub-degree phase error at 100 kHz.

It uses an internal +2.5 V reference (±10 mV @ +25°C, 25 ppm/°C TC) and operates from a single +5 V supply. Conversion control is fully synchronous via CS, RD, and A0, with BUSY signaling completion and 12-bit twos-complement output coding.

Key Specifications

Pinout & Package

AD7862ARSZ-10 is housed in a 28-lead Shrink Small Outline Package (SSOP), RoHS-compliant, with 0.65 mm lead pitch and exposed pad for thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7862ARSZ-10, AD7863ARSZ-10 offers higher resolution but identical timing and package compatibility, while ADS8364IPAG trades parallel simplicity for channel count and interface flexibility - neither is pin-compatible, and all require board-level validation for signal integrity and power delivery.

Availability

AD7862ARSZ-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 guaranteed traceable sourcing.

Supply support for AD7862ARSZ-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, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD7862ARSZ-10 belongs to Analog Devices' precision data acquisition product line, designed specifically for applications demanding synchronized dual-channel sampling, robust industrial input ranges, and deterministic conversion timing in harsh electrical environments.

FAQ

What is the maximum analog input voltage the AD7862ARSZ-10 can tolerate without damage?

The AD7862ARSZ-10 features overvoltage protection allowing analog inputs (VA1, VA2, VB1, VB2) to withstand up to ±17 V relative to AGND without permanent damage. This rating applies specifically to the AD7862-10 variant and is confirmed in the Absolute Maximum Ratings table. Operation beyond ±10 V is not functional - it is purely fault-tolerant - and the device continues normal conversion only within its specified ±10 V range. Always maintain proper input filtering and transient suppression in industrial settings.

Does the AD7862ARSZ-10 require an external reference, or does it include one internally?

The AD7862ARSZ-10 includes an internal +2.5 V reference with ±10 mV accuracy at +25°C and ±25 mV error over temperature. The VREF pin serves as both output (when using internal reference) and input (to accept external +2.5 V references like AD780). For most applications, connecting a 0.1 µF ceramic capacitor from VREF to AGND suffices. External references are recommended only when tighter initial tolerance (<±2 mV) or lower drift (<5 ppm/°C) is required.

How does the AD7862ARSZ-10 handle simultaneous sampling of two channels?

The AD7862ARSZ-10 achieves true simultaneous sampling by using two independent track-and-hold amplifiers triggered identically on the falling edge of the CONVST signal. Both amplifiers enter hold mode within 20 ns aperture delay (matched to 200 ps), then feed their sampled voltages to separate 12-bit SAR ADCs. This architecture preserves phase coherence between Channel A and Channel B - critical for vector-based control and power calculations - and is verified by the 200 ps aperture delay matching specification.

What is the function of the A0 pin on the AD7862ARSZ-10, and how does it affect data reading?

The A0 pin on the AD7862ARSZ-10 selects which pair of conversion results appears on the DB11–DB0 bus during a read cycle. When A0 is low and CS/RD are asserted, the first read returns VA1 (Channel A, Input 1) or VB1 (Channel B, Input 1); the second read returns VA2 or VB2. When A0 is high, the order reverses: first read yields VA2/VB2, second yields VA1/VB1. This multiplexed read scheme enables compact memory mapping without additional address lines.

Is the AD7862ARSZ-10 compatible with 3.3 V logic systems?

No - the AD7862ARSZ-10 is a 5 V-only device: VDD must be +5 V ±5%, and its digital interface (CS, RD, CONVST, A0, BUSY, DB11–DB0) operates at TTL levels (VIH ≥ 2.4 V, VIL ≤ 0.8 V). Direct connection to 3.3 V microcontrollers requires level translation on all control and data lines. The datasheet explicitly specifies VDD = +5 V ±5% and does not support mixed-supply or 3.3 V I/O operation. Using it with 3.3 V logic without translation risks undefined behavior or latch-up.