AD7865YS-3

Overview

The AD7865YS-3 is a four-channel, simultaneous sampling, 14-bit analog-to-digital converter (ADC) operating from a single +5 V supply. It features four track/hold amplifiers and a successive approximation ADC with a conversion time of 2.4 µs per channel. The device supports input ranges of ±2.5 V and includes an internal 2.5 V reference and on-chip clock oscillator. It offers a high-speed parallel interface compatible with 3 V processors and provides overvoltage protection on analog inputs up to ±18 V. The Y version operates within a temperature range of -40°C to +105°C.

Feature Summary

• Four simultaneously sampled inputs preserve relative phase information across channels.
• Hardware or software selectable channel sequence allows conversion of any subset of the four channels.
• High-speed parallel interface facilitates direct connection to microprocessors and DSPs.
• Analog inputs feature overvoltage protection allowing voltages up to ±18 V without damage.

Applications

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

Procurement Notes

Verify the specific suffix 'Y' indicates the extended industrial temperature range (-40°C to +105°C) compared to commercial variants. Confirm the '-3' designation corresponds to the ±2.5 V bipolar input range. Ensure the package type matches the required PCB footprint for the 44-lead PQFP. Check for RoHS compliance status if required by local regulations.

Selection Notes

Select this model when simultaneous sampling of four channels is required to maintain phase coherence. Choose the AD7865YS-3 specifically for applications requiring a ±2.5 V input range and operation in environments up to +105°C. Consider the AD7865BS-3 if a lower integral nonlinearity error is needed but the commercial temperature range suffices. Evaluate power consumption requirements against the typical 115 mW normal mode dissipation.

Part Context

The AD7865 belongs to Analog Devices' family of fast, low-power, multi-channel ADCs. The AD7865YS-3 is the automotive-grade variant of the AD7865-3, distinguished by its extended temperature rating. It shares the same functional architecture as the AS-3 and BS-3 models but is qualified for higher thermal stress environments.

Replacement Considerations

Public confirmed substitutes include AD7865BS-3 for commercial temperature range applications and AD7865AS-3 for standard industrial use. Direct pin-compatible replacements with different input ranges are not suitable without hardware modification.