AD7862AR-10

Overview

The AD7862AR-10 is a dual 12-bit successive approximation analog-to-digital converter (ADC) operating from a single +5 V supply. It features two simultaneous sampling and conversion channels with four analog inputs grouped into two selectable channels via the A0 pin. The device provides a throughput rate of 250 kSPS with a conversion time of 3.6 μs and an acquisition time of 0.3 μs. It includes an internal +2.5 V reference, high-speed parallel interface, and overvoltage protection allowing inputs up to ±17 V without damage. Typical power consumption is 60 mW in normal mode.

Feature Summary

• Simultaneous sampling and conversion of two independent channels preserves relative phase information between input signals.
• Integrated track/hold amplifiers ensure accurate digitization of full-scale sine waves at maximum throughput rates.
• Built-in overvoltage protection on analog inputs prevents device damage during voltage excursions beyond the selected range.
• Automatic power-down mode reduces power consumption significantly after each conversion cycle completes.

Applications

• AC motor control systems requiring precise phase data
• Uninterrupted power supplies (UPS)
• Data acquisition systems

Procurement Notes

Verify the specific suffix 'AR' corresponds to the 28-pin SOIC package and the '-10' indicates the ±10 V input range before ordering. Confirm that the required temperature grade matches the commercial specification (-40°C to +85°C). Ensure the design accommodates the parallel interface timing requirements for CS, RD, and CONVST signals.

Selection Notes

Select this component when simultaneous sampling of two channels is critical for maintaining signal phase relationships. Choose the -10 variant specifically for applications requiring a standard industrial ±10 V input range. Consider the AD7863 if a 14-bit resolution upgrade is needed while maintaining pin compatibility.

Part Context

The AD7862 belongs to Analog Devices' family of high-speed, low-power dual ADCs fabricated using LC2MOS technology. This series integrates precision bipolar circuits with low-power CMOS logic to achieve fast conversion speeds within a compact footprint. The AR-10 designation identifies the specific package and input range configuration within this product line.

Replacement Considerations

The AD7863 serves as a pin-compatible 14-bit upgrade option. Other variants within the AD7862 family include the AD7862-3 for ±2.5 V ranges and the AD7862-2 for unipolar 0 V to 2.5 V applications.