AD7865ASZ-3

Overview

The AD7865ASZ-3 is a four-channel, simultaneous sampling, fast, 14-bit analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates from a single +5 V supply and features an internal 2.5 V reference, on-chip clock oscillator, signal conditioning circuitry, and a high-speed parallel interface. The device accepts analog input ranges of ±2.5 V for the -3 suffix variant. It provides four track/hold amplifiers to preserve relative phase information across inputs. Maximum throughput is 350 kSPS per channel or 100 kSPS for all four channels. The part is housed in a 44-lead Plastic Lead Quad Flatpack (PQFP) package.

Feature Summary

• Four simultaneously sampled inputs with dedicated track/hold amplifiers
• High-speed parallel interface compatible with 3 V processors
• Internal 2.5 V voltage reference and clock oscillator
• Hardware or software selectable channel conversion sequences

Applications

• AC Motor Control
• Uninterruptible Power Supplies
• Industrial Power Meters/Monitors
• Data Acquisition Systems
• Communications

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm pinout compatibility and electrical specifications. Ensure that the selected component matches the required input voltage range and operating temperature grade for the intended application environment before finalizing procurement.

Selection Notes

Select this component when simultaneous multi-channel sampling is required to maintain phase coherence between signals. Consider the -3 suffix specifically for bipolar ±2.5 V input applications. Evaluate the parallel interface requirements against the host processor capabilities and ensure adequate decoupling for the 5 V supply rails to meet dynamic performance specifications.

Part Context

This component belongs to the AD7865 family of four-channel ADCs. Variants within the series differ primarily in analog input voltage ranges: the -1 suffix supports ±5 V and ±10 V, the -2 suffix supports unipolar 0 V to 2.5 V and 0 V to 5 V, and the -3 suffix supports ±2.5 V. All variants share the same core architecture, package, and digital interface characteristics.

Replacement Considerations

Direct functional replacements within the same family include the AD7865BSZ-3 for improved accuracy specifications. Other variants such as the AD7865ASZ-1 or AD7865ASZ-2 are not electrically compatible due to different input voltage ranges.