AD7863AR-2

Overview

The AD7863AR-2 is a dual 14-bit successive approximation analog-to-digital converter (ADC) from Analog Devices, operating on a single 5 V supply. It features two simultaneous sampling channels with four input terminals grouped into Channel A and Channel B. The device supports an unipolar input voltage range of 0 V to 2.5 V and includes overvoltage protection up to +7 V. Key electrical parameters include a maximum conversion time of 5.2 μs, a typical power consumption of 45 mW in normal mode, and a maximum power dissipation of 57.75 mW at 5.25 V. It utilizes a high-speed parallel interface for data transfer.

Feature Summary

• Simultaneous sampling and conversion of two independent channels to preserve relative phase information between input signals.
• Integrated internal 2.5 V reference voltage source with the option to accept an external reference input.
• Automatic power-down mode that minimizes energy consumption by entering standby after each conversion cycle.
• Built-in overvoltage protection on analog inputs to prevent damage during signal excursions beyond the operational range.

Applications

• Battery-powered or portable instrumentation requiring low power consumption.
• Data acquisition systems needing precise phase relationship preservation between multiple analog signals.
• Industrial control applications interfacing with microprocessors via high-speed parallel buses.

Procurement Notes

Verify the specific suffix 'AR-2' corresponds to the unipolar 0 V to 2.5 V input range variant when sourcing. Confirm package availability in SOIC_W or SSOP formats as required by the design. Ensure the ordering documentation matches the manufacturer's current revision to avoid discrepancies in pinout or specifications.

Selection Notes

Select this component when a dual-channel ADC with simultaneous sampling capability is required for 14-bit resolution applications. The unipolar input range makes it suitable for single-supply sensor interfaces. Consider the parallel interface requirements and ensure the host system can manage the CONVST, CS, and RD control signals effectively.

Part Context

The AD7863 serves as a 14-bit upgrade to the earlier AD7862 series while maintaining lead compatibility. It belongs to the AD7863 family, which offers different input ranges including ±10 V and ±2.5 V variants. This specific model addresses applications requiring unipolar signal processing with high throughput and low power characteristics.

Replacement Considerations

The AD7862 is a compatible predecessor offering similar functionality but with 12-bit resolution. Verify that the lower resolution of the AD7862 meets the application's accuracy requirements before substitution.