AD7865ASZ-2REEL

Overview

The AD7865ASZ-2REEL is a four-channel, simultaneous sampling, 14-bit analog-to-digital converter (ADC) manufactured by Analog Devices. It operates from 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, an internal 2.5 V reference, and a high-speed parallel interface compatible with 3 V processors. It supports unipolar input ranges of 0 V to 2.5 V or 0 V to 5 V. Key performance metrics include a maximum throughput of 350 kSPS for a single channel and 100 kSPS for all four channels. Typical power consumption is 100 mW in normal mode and 15 µW in standby mode.

Feature Summary

• Four simultaneously sampled inputs preserve relative phase information across channels.
• Hardware or software selectable channel sequences allow flexible subset conversion.
• Integrated overvoltage protection on analog inputs prevents damage during fault conditions.
• Low power operation with a dedicated standby mode for energy conservation.

Applications

• AC motor control systems
• Uninterruptible power supplies
• Industrial power meters and monitors
• Data acquisition systems

Procurement Notes

Verify the specific suffix 'REEL' indicates tape-and-reel packaging when sourcing this component. Confirm that the ASZ variant meets RoHS compliance requirements for your region. Ensure the ordering code matches the unipolar input range specification of the AD7865-2 version. Cross-reference the manufacturer's latest datasheet revision to confirm pinout and electrical characteristics remain unchanged.

Selection Notes

Select the AD7865ASZ-2REEL when simultaneous sampling of four channels is required to maintain signal phase integrity. Choose this part if the application demands a single +5 V supply and unipolar input voltage ranges. Consider the parallel interface for direct connection to microprocessors or DSPs without serial protocol overhead. Evaluate the 14-bit resolution against system accuracy requirements before finalizing the design.

Part Context

The AD7865 series comprises fast, low-power, four-channel simultaneous sampling ADCs. The AD7865-2 variant specifically targets applications requiring unipolar input ranges of 0 V to 2.5 V or 0 V to 5 V. It shares the core architecture of the series, including the SAR converter and track/hold amplifiers, but differs in input scaling and output coding compared to bipolar variants.

Replacement Considerations

Direct replacements within the same family include the AD7865BSZ-2REEL, which offers improved linearity specifications while maintaining identical pinouts and functionality. Other variants like the AD7865ASZ-1 or AD7865ASZ-3 differ in input voltage ranges and should only be considered if the circuit allows for hardware modifications to accommodate different signal scaling.