AD7862ARSZ-3

Overview

The AD7862ARSZ-3 is a dual 12-bit successive approximation analog-to-digital converter (ADC) from Analog Devices, housed in a 28-lead Shrink Small Outline Package (SSOP). It features two simultaneous sampling channels with a throughput rate of 250 kSPS and a conversion time of 3.6 μs. The device operates on a single +5 V supply, consuming typically 60 mW in normal mode and 50 mW in power-saving mode. It supports an analog input range of ±2.5 V with overvoltage protection up to ±7 V. Key specifications include a signal-to-noise ratio of 70 dB minimum, differential nonlinearity of ±1 LSB, and integral nonlinearity of ±1 LSB.

Feature Summary

• Simultaneous sampling and conversion of two independent channels preserves relative phase information between inputs.
• Integrated internal +2.5 V reference eliminates the need for external voltage references in standard applications.
• High-speed parallel interface allows 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 requiring precise phase tracking
• Uninterrupted power supplies (UPS) monitoring
• Data acquisition systems
• Communications equipment

Procurement Notes

Verify the specific suffix 'S' indicates the extended temperature range (-55°C to +125°C) compared to commercial variants. Confirm package type is SSOP-28. Check RoHS compliance status as manufacturing processes may update. Ensure ordering documentation matches the exact part number AD7862ARSZ-3 to avoid confusion with DIP or SOIC packages.

Selection Notes

Select this component when simultaneous sampling of two channels is required within a single package. Choose the -3 version specifically for bipolar ±2.5 V input ranges. Consider the AD7863 if 14-bit resolution is needed, noting it is pin-compatible but has lower throughput. Verify that the parallel interface logic levels match the target system's requirements.

Part Context

The AD7862 belongs to a family of high-speed dual ADCs designed for applications needing phase-coherent sampling. It is fabricated using Linear Compatible CMOS (LC2MOS) process technology. The device offers a cost-effective solution compared to discrete track/hold and ADC combinations, integrating all necessary functions into one compact IC.

Replacement Considerations

The AD7863 is a 14-bit pin-compatible upgrade offering higher resolution but reduced throughput. Other versions like AD7862AR-3 provide identical electrical performance but differ in package type (SOIC vs. SSOP) and operating temperature range.