AD7862ARS-2

Overview

The AD7862ARS-2 is a dual 12-bit simultaneous sampling analog-to-digital converter manufactured by Analog Devices Inc. It operates from a single +5 V supply and features two successive approximation ADCs with track/hold amplifiers. The device supports an input voltage range of 0 V to +2.5 V, utilizing straight binary output coding. Key electrical parameters include a maximum conversion time of 3.6 μs, a typical power dissipation of 60 mW in normal mode, and a standby power consumption of 75 μW. It provides overvoltage protection up to +7 V on analog inputs and includes an internal +2.5 V reference.

Feature Summary

• Simultaneous sampling and conversion of two channels preserves relative phase information between signals.
• Integrated automatic power-down mode reduces energy consumption during idle periods for portable applications.
• High-speed parallel interface facilitates direct connection to microprocessors and digital signal processors.

Applications

• AC Motor Control
• Uninterrupted Power Supplies
• Data Acquisition Systems

Procurement Notes

Verify the specific ordering suffix 'ARS' corresponds to the 28-Bit Shrink Small Outline Package (RS-28) and the extended temperature rating of -55°C to +125°C as defined in the manufacturer's ordering guide. Confirm that the '-2' suffix indicates the 0 V to +2.5 V unipolar input range requirement for your circuit design before finalizing procurement.

Selection Notes

Select this component when a unipolar 0 V to +2.5 V input range is required alongside simultaneous dual-channel sampling capabilities. The 'S' version designation ensures suitability for environments requiring operation down to -55°C. Ensure the system architecture can accommodate the 28-pin SSOP package dimensions and the high-speed parallel interface timing constraints specified in the datasheet.

Part Context

This part belongs to the AD7862 family of dual 12-bit ADCs, which also includes variants with ±10 V and ±2.5 V input ranges. The AD7862 series is designed for applications requiring precise phase relationship maintenance between sampled signals. It serves as a pin-compatible upgrade path to the 14-bit AD7863 model while maintaining the same footprint and interface logic.

Replacement Considerations

The AD7862AR-2 and AD7862BR-2 are alternative packages within the same commercial temperature range (-40°C to +85°C). For higher resolution requirements, the AD7863 offers 14-bit performance with pin compatibility. Verify thermal management needs if replacing with a different package type due to varying thermal impedance specifications.