AD7865AS-2

Overview

The AD7865AS-2 is a four-channel, simultaneous sampling, 14-bit successive approximation analog-to-digital converter (ADC) operating from a single +5 V supply. It features four track/hold amplifiers with an acquisition time of 0.35 µs and a conversion time of 2.4 µs per channel. The device supports input ranges of 0 V to 2.5 V or 0 V to 5 V, utilizing straight binary output coding. Maximum throughput rates are 350 kSPS for a single channel and 100 kSPS across all four channels. It includes an internal 2.5 V reference, on-chip clock oscillator, and overvoltage protection on analog inputs.

Feature Summary

• Four simultaneously sampled inputs preserve relative phase information across channels.
• Hardware or software selectable channel sequences allow flexible subset conversion.
• High-speed parallel interface facilitates connection to microprocessors and DSPs.
• Analog inputs feature overvoltage protection against damage during excessive voltage conditions.

Applications

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

Procurement Notes

Verify the specific suffix 'AS' indicates the commercial temperature range (-40°C to +85°C) and plastic lead quad flatpack package. Confirm that the '-2' designation matches the required unipolar input voltage ranges (0 V to 2.5 V or 0 V to 5 V). Ensure the ordering documentation specifies the correct accuracy grade corresponding to the 'A' version parameters.

Selection Notes

Select this component when simultaneous multi-channel sampling is required to maintain signal phase relationships. Choose the AD7865AS-2 specifically for applications requiring unipolar input signals within the 0 V to 5 V range. Consider the 14-bit resolution and 350 kSPS throughput rate for high-speed data acquisition needs. Verify compatibility with 5 V logic levels or utilize the VDRIVE pin for 3 V processor interfacing.

Part Context

The AD7865AS-2 belongs to the AD7865 family of fast, low-power, four-channel ADCs. This family differentiates models based on analog input ranges: the -1 variant handles bipolar ±10 V/±5 V, the -3 handles ±2.5 V, and the -2 handles unipolar 0 V to 5 V/2.5 V ranges. All variants share the same SAR architecture, 44-lead PQFP package, and core performance specifications.

Replacement Considerations

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