AD7863ARZ-2REEL

Overview

The AD7863ARZ-2REEL is a dual-channel, 14-bit successive approximation register (SAR) analog-to-digital converter manufactured by Analog Devices. It operates from a single 5 V supply and features simultaneous sampling and conversion at a throughput rate of 175 kSPS. The device includes two track-and-hold amplifiers, an internal 2.5 V reference, and a high-speed parallel interface. Designed for the AD7863-2 variant, it supports a unipolar input voltage range of 0 V to 2.5 V with straight binary output coding. Key electrical specifications include a typical power dissipation of 45 mW in normal mode and a maximum of 105 μW in power-down mode.

Feature Summary

• Simultaneous sampling and conversion on two channels preserves relative phase information between inputs.
• Integrated internal 2.5 V reference allows for simplified system design without external components.
• Automatic power-down mode reduces average power consumption for battery-operated applications.
• Analog inputs feature overvoltage protection to prevent damage during fault conditions.

Applications

• Vector motor control systems requiring precise phase data.
• Portable instrumentation utilizing low-power SAR ADCs.
• Industrial signal processing with unipolar input requirements.

Procurement Notes

Verify that the REEL suffix indicates tape-and-reel packaging rather than tube packaging when sourcing this specific part number. Confirm the -2 suffix matches the required 0 V to 2.5 V unipolar input range for your application. Ensure compatibility with standard 5 V logic levels for the parallel interface signals.

Selection Notes

Select the AD7863ARZ-2REEL specifically for applications requiring a 0 V to 2.5 V input range. Choose this part over the -10 or -3 variants if bipolar inputs are not needed. Consider the 175 kSPS throughput and 5.2 μs conversion time against system timing requirements. Verify that the parallel interface fits the available microprocessor or DSP resources.

Part Context

The AD7863 series serves as a 14-bit upgrade to the AD7862 family. The AD7863ARZ-2REEL belongs to the B version temperature range (-40°C to +85°C). It utilizes Linear Compatible CMOS (LC2MOS) technology to combine precision bipolar circuits with low-power CMOS logic. The device is housed in a 28-lead SOIC_W package.

Replacement Considerations

The AD7862 is a compatible predecessor but offers lower resolution. For pin-compatible upgrades within the same family, consider the AD7863ARZ-3 for ±2.5 V ranges or the AD7863ARZ-10 for ±10 V ranges, provided the input voltage requirements match.