AD7864ASZ-3REEL

Overview

The AD7864ASZ-3REEL is a high-speed, low-power, 4-channel simultaneous sampling analog-to-digital converter (ADC) from Analog Devices. It features a 12-bit successive approximation architecture with a maximum throughput of 520 kSPS per channel and 130 kSPS for all four channels. The device operates on a single 5 V supply, consuming typically 90 mW in normal mode and 20 μW in standby. It includes an internal 2.5 V reference, track-and-hold amplifiers, and a parallel interface compatible with 3 V processors. The AD7864-3 variant supports a ±2.5 V bipolar input range.

Feature Summary

• Four simultaneously sampled inputs preserve relative phase information across channels.
• Hardware or software selectable conversion sequences allow flexible channel subset selection.
• Integrated overvoltage protection on analog inputs prevents damage from voltage excursions.
• Low power consumption with a dedicated standby mode for energy-efficient operation.

Applications

• AC motor control systems requiring precise multi-phase signal acquisition.
• Uninterrupted power supplies (UPS) for real-time monitoring and control.
• High-speed data acquisition systems in industrial and scientific instruments.
• Communications equipment utilizing simultaneous multi-channel sampling.

Procurement Notes

Verify the specific suffix 'REEL' indicates tape-and-reel packaging rather than tray packaging when ordering. Confirm the '-3' designation matches the required ±2.5 V input range for your application. Ensure the MQFP-44 package footprint aligns with your PCB design constraints. Check for RoHS compliance status if environmental regulations apply to your manufacturing process.

Selection Notes

Select the AD7864-3 variant specifically for applications requiring a ±2.5 V bipolar input range. Consider the AD7864-1 if ±10 V or ±5 V ranges are needed, or the AD7864-2 for unipolar 0 V to 5 V inputs. Evaluate the need for simultaneous sampling versus sequential sampling to determine if this device meets your phase coherence requirements compared to lower-cost alternatives.

Part Context

The AD7864 belongs to Analog Devices' family of high-speed, multi-channel SAR ADCs. It is designed for applications demanding precise timing relationships between multiple analog signals. The device integrates essential functions like references and clocks, reducing external component count. It serves as a bridge between analog sensor signals and digital processing units in complex embedded systems.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing system interfaces before considering alternative devices. Consult Analog Devices technical support for cross-reference recommendations based on specific performance criteria.