AD7862AR-3REEL

Overview

The AD7862AR-3REEL is a dual 12-bit successive approximation analog-to-digital converter manufactured by Analog Devices. It operates from a single +5 V supply and features two simultaneous sampling channels with four total analog inputs (VA1, VA2, VB1, VB2). The device supports an input voltage range of ±2.5 V and includes an internal +2.5 V reference. Key electrical parameters include a maximum conversion time of 3.6 μs, a throughput rate of 250 kSPS, and a typical power dissipation of 60 mW in normal mode. It utilizes a high-speed parallel interface for data transfer.

Feature Summary

• Simultaneous sampling and conversion of two independent channels to preserve relative phase information.
• Integrated track/hold amplifiers with tight aperture delay matching between channels.
• Internal +2.5 V voltage reference with the option for external reference connection.
• Automatic power-down mode that activates after conversion completion to minimize power consumption.

Applications

• AC motor control systems
• Uninterrupted power supplies
• Data acquisition systems
• Communications equipment

Procurement Notes

Verify the specific REEL suffix indicates tape-and-reel packaging rather than tube packaging when sourcing components. Confirm the -3 designation corresponds to the ±2.5 V input range variant. Ensure compatibility with standard 5V logic levels for the parallel interface connections during integration.

Selection Notes

Select this component for applications requiring simultaneous sampling of multiple signals with minimal phase skew. The ±2.5 V input range suits low-voltage signal processing tasks. Consider the 60 mW power consumption for battery-operated designs utilizing the automatic power-down feature. Verify that the 250 kSPS throughput meets system bandwidth requirements.

Part Context

The AD7862 belongs to a family of high-speed, low-power dual ADCs from Analog Devices. It is pin-compatible with the 14-bit AD7863, allowing for potential upgrades in resolution without changing the PCB layout. The device is fabricated using Linear Compatible CMOS (LC2MOS) technology, combining precision bipolar circuits with low-power CMOS logic.

Replacement Considerations

The AD7863 offers 14-bit resolution with similar pinout but lower throughput. The AD7862-10 provides a ±10 V input range instead of ±2.5 V. The AD7862-2 supports unipolar 0 V to 2.5 V inputs. Check datasheet specifications for timing and accuracy differences before substitution.