AD7862ARS-3

Overview

The AD7862ARS-3 is a dual 12-bit successive approximation analog-to-digital converter (ADC) fabricated in the Linear Compatible CMOS process. It operates from a single +5 V supply and features two simultaneous sampling channels with four analog inputs grouped into Channel A and Channel B. The device includes an internal +2.5 V reference, track/hold amplifiers, and a high-speed parallel interface. Key electrical parameters include a maximum conversion time of 3.6 μs, a throughput rate of 250 kSPS, and a typical power dissipation of 60 mW. The input voltage range for this specific version is ±2.5 V, with overvoltage protection up to ±7 V.

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.
• Automatic power-down mode reduces power consumption significantly after each conversion cycle completes.
• Built-in overvoltage protection on analog inputs prevents damage during voltage excursions beyond the operating range.

Applications

• AC motor control systems requiring precise phase tracking
• Uninterrupted power supplies (UPS) monitoring
• Data acquisition systems needing multi-channel synchronization

Procurement Notes

Verify the ordering suffix 'S' confirms the extended temperature range of -55°C to +125°C and the shrink small outline package (RS-28). Confirm the '-3' suffix indicates the ±2.5 V input voltage range. Ensure compatibility with system requirements for single +5 V operation and parallel digital interfaces before finalizing procurement.

Selection Notes

Select the AD7862ARS-3 when simultaneous sampling of two channels is required within a ±2.5 V input range. Choose this variant over the AR or BR versions if the application demands an extended industrial temperature range (-55°C to +125°C). 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. It is designed for applications requiring precise timing relationships between multiple analog signals. The 'ARS' designation specifically denotes the Shrink Small Outline Package with extended temperature capabilities, distinguishing it from standard commercial grade variants.

Replacement Considerations

The AD7863 serves as a 14-bit pin-compatible upgrade option. Other members of the AD7862 family, such as AD7862AR-3 or AD7862BR-3, offer identical functionality but differ in temperature range or package type rather than electrical performance.