AD7862ARZ-3REEL

Overview

The AD7862ARZ-3REEL is a dual 12-bit successive approximation analog-to-digital converter (ADC) fabricated in Analog Devices' LC2MOS process. It operates from a single +5 V supply and features two simultaneous sampling channels with four analog inputs grouped into Channel A and Channel B. The device includes an internal +2.5 V reference, track/hold amplifiers, and a high-speed parallel interface. 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. The input voltage range for the -3 version is ±2.5 V, with overvoltage protection up to ±7 V.

Feature Summary

• Simultaneous sampling and conversion of two independent channels preserves relative phase information between signals.
• Integrated track/hold amplifiers ensure accurate acquisition of full-scale sine waves at maximum throughput rates.
• High-speed parallel data bus facilitates direct connection to microprocessors and digital signal processors.
• Automatic power-down mode reduces power consumption significantly after each conversion cycle.

Applications

• AC motor control systems
• Uninterrupted power supplies (UPS)
• Data acquisition systems

Procurement Notes

Verify that the specific suffix 'REEL' corresponds to tape-and-reel packaging rather than tube packaging when reviewing distributor listings. Confirm the '-3' designation indicates the ±2.5 V input range variant. Ensure the component meets the required operating temperature range of -40°C to +85°C for commercial applications. Cross-reference the datasheet revision to confirm pinout and timing specifications match your design requirements.

Selection Notes

Select this component when simultaneous sampling of two channels is required to maintain phase coherence. Choose the -3 suffix if the application demands a ±2.5 V input range. Consider the AD7863 if a 14-bit resolution upgrade is needed while maintaining pin compatibility. Evaluate the 60 mW power consumption against battery life requirements in portable designs.

Part Context

The AD7862 belongs to the AD7862 series of dual ADCs from Analog Devices. It is part of a family that includes variants with different input ranges (-10 for ±10 V, -2 for unipolar). The device serves as a bridge between high-speed analog signals and digital processing systems, offering a balance of speed, accuracy, and low power consumption suitable for industrial and communications applications.

Replacement Considerations

The AD7863 is a 14-bit pin-compatible upgrade option. Other variants within the same package include AD7862AR-10 and AD7862AR-2 for different input ranges.