AD7865ASZ-1

Overview

The AD7865ASZ-1 is a four-channel, simultaneous sampling, 14-bit analog-to-digital converter (ADC) from Analog Devices. It operates on a single +5 V supply and features a successive approximation architecture with a conversion time of 2.4 µs per channel. The device includes four track/hold amplifiers for simultaneous signal acquisition, preserving relative phase information across channels. It supports input ranges of ±5 V and ±10 V, with overvoltage protection up to ±9 V or ±18 V respectively. The part utilizes a high-speed parallel interface compatible with 3 V processors and offers a typical power consumption of 115 mW in normal mode.

Feature Summary

• Four simultaneously sampled inputs with dedicated track/hold amplifiers
• Hardware or software selectable channel conversion sequences
• High-speed parallel interface allowing interfacing to 3 V processors
• Overvoltage protection on analog inputs

Applications

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

Procurement Notes

Verify the specific suffix 'A' indicates the commercial temperature range (-40°C to +85°C) and '1' denotes the ±5 V/±10 V input range configuration. Confirm package type is PQFP-44. Check RoHS compliance status as specified in the ordering guide. Ensure voltage supplies match the 5 V nominal requirement for optimal performance.

Selection Notes

Select this model when bipolar input signals within ±5 V or ±10 V ranges are required. Choose the AD7865ASZ-1 over other variants if simultaneous sampling of four channels is necessary for phase-sensitive applications. Consider the parallel interface requirements and ensure the host system can handle the 14-bit data bus timing constraints.

Part Context

The AD7865 series comprises three main versions differentiated by input voltage ranges: -1 for ±5 V/±10 V, -2 for unipolar 0 V to 2.5 V/5 V, and -3 for ±2.5 V. The ASZ-1 variant specifically targets industrial applications requiring standard bipolar ranges. It belongs to the fast, low-power ADC family designed for multi-channel data acquisition systems.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.