AD7862ARSZ-2

Overview

The AD7862ARSZ-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 integrated 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 throughput rate up to 250 kSPS, and typical power dissipation of 60 mW in normal mode. It includes an internal +2.5 V reference and provides overvoltage protection on analog inputs.

Feature Summary

• Simultaneous sampling and conversion of two channels preserves relative phase information between signals.
• Integrated automatic power-down mode reduces power 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 'RS' corresponds to the 28-lead Shrink Small Outline Package (SSOP) as documented in the manufacturer's ordering guide. Confirm that the '-2' suffix designates the 0 V to +2.5 V unipolar input range variant. Ensure compliance with the extended temperature specifications associated with this package type if operating conditions require it.

Selection Notes

Select the AD7862ARSZ-2 when a unipolar 0 V to +2.5 V input range is required alongside simultaneous dual-channel sampling. This model is suitable for applications needing straight binary output coding rather than two's complement. Consider the extended temperature range capabilities inherent to the 'S' version package if environmental conditions exceed standard commercial limits.

Part Context

The AD7862ARSZ-2 belongs to the AD7862 family of high-speed, low-power dual 12-bit ADCs. It shares the core architecture with the AD7862-10 and AD7862-3 variants but is specifically configured for unipolar input signals. The 'S' designation indicates availability in an extended temperature range package, distinguishing it from the standard commercial grade versions.

Replacement Considerations

The AD7863 serves as a pin-compatible upgrade offering 14-bit resolution. For unipolar applications requiring higher precision, verify compatibility with the AD7863's specific input range and timing characteristics against the original system requirements.