AD7862ARZ-3

Overview

The AD7862ARZ-3 is a dual 12-bit successive approximation analog-to-digital converter (ADC) operating from a single +5 V supply. It features two simultaneous sampling channels with a throughput rate of 250 kSPS and a conversion time of 3.6 μs. The device provides four analog inputs grouped into two channels, accepting an input voltage range of ±2.5 V. Key electrical specifications include a typical signal-to-noise ratio of 71 dB, differential nonlinearity of ±1 LSB, and integral nonlinearity of ±1 LSB. Power consumption is typically 60 mW in normal mode and 75 μW in standby.

Feature Summary

• Simultaneous sampling and conversion of two independent channels to preserve relative phase information.
• Integrated internal +2.5 V reference with overvoltage protection on analog inputs.
• High-speed parallel interface compatible with standard microprocessor control logic.
• Automatic power-down mode for reduced energy consumption between conversions.

Applications

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

Procurement Notes

Verify the specific suffix '3' confirms the ±2.5 V input voltage range requirement for your application. Confirm the package type matches the design footprint, as this part number corresponds to the SOIC-28 variant. Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS process. Cross-reference the revision level if strict historical compliance is required.

Selection Notes

Select the AD7862ARZ-3 when a ±2.5 V input range is required rather than the ±10 V or unipolar options. Consider the AD7863 if 14-bit resolution is needed for pin-compatible upgrades. Evaluate the 250 kSPS throughput against system bandwidth requirements. Verify that the parallel interface timing meets the host processor's setup and hold constraints.

Part Context

This component belongs to the AD7862 family of high-speed, low-power dual ADCs fabricated using Linear Compatible CMOS technology. It serves as a bridge between analog signals and digital processing units. The 'AR' designation indicates the commercial temperature range and SOIC package, while the '-3' suffix specifies the ±2.5 V input scaling configuration.

Replacement Considerations

The AD7862BRZ-3 is a direct replacement offering the same specifications within the commercial temperature range but potentially different manufacturing lot characteristics. For higher resolution needs, the AD7863 series provides a 14-bit pin-compatible upgrade.