AD7865ASZ-3REEL

Overview

The AD7865ASZ-3REEL is a four-channel, simultaneous sampling, fast, 14-bit analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates from a single +5 V supply and features a 2.4 µs successive approximation ADC architecture with four track/hold amplifiers. The device accepts bipolar analog input ranges of ±2.5 V and includes an internal 2.5 V reference. It provides a high-speed parallel interface compatible with 3 V processors and supports hardware or software selection of the channel conversion sequence. Maximum throughput rates are 350 kSPS for a single channel and 100 kSPS across all four channels.

Feature Summary

• Four simultaneously sampled inputs preserve relative phase information among analog signals.
• Integrated signal conditioning circuitry allows direct interfacing to industrial voltage levels without external scaling components.
• Analog inputs feature overvoltage protection to prevent damage during fault conditions.
• Configurable channel selection enables optimized throughput by converting only required subsets of the four channels.

Applications

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

Procurement Notes

Verify that the ordering suffix matches the required package type and temperature range specifications. Confirm the specific model variant corresponds to the intended analog input voltage range before procurement. Ensure compatibility with system power supply requirements and logic voltage levels.

Selection Notes

Select this component when simultaneous multi-channel sampling is required to maintain signal phase relationships. Choose the AD7865ASZ-3REEL specifically for applications requiring a ±2.5 V bipolar input range. Consider the parallel interface requirements and ensure the host processor can accommodate the 14-bit data bus width and timing constraints.

Part Context

This part belongs to the AD7865 family of four-channel simultaneous sampling ADCs. Variants within the family differ primarily in their supported analog input voltage ranges and accuracy grades. The AD7865ASZ-3REEL represents the A-grade version configured for the ±2.5 V input range.

Replacement Considerations

Direct replacements include other variants within the AD7865 series such as the AD7865BSZ-3REEL, which offers improved accuracy specifications while maintaining the same pinout and functionality.

FAQ

How does the AD7865 handle channel selection?

Channel selection can be performed via hardware using the SL1-SL4 pins or via software by programming the channel select register through the DB0-DB3 data lines.

What is the maximum throughput rate for all four channels?

The maximum throughput rate for all four channels operating simultaneously is 100 kSPS.

Can the AD7865 interface with 3 V processors?

Yes, the high-speed parallel interface allows interfacing to 3 V processors by adjusting the VDRIVE supply voltage.