AD7863AR-3

Overview

The AD7863AR-3 is a dual-channel, 14-bit successive approximation analog-to-digital converter (ADC) manufactured by Analog Devices. It operates from a single 5 V supply and supports simultaneous sampling at a throughput rate of 175 kSPS with a conversion time of 5.2 μs. The device features four analog input channels grouped into two selectable pairs via the A0 pin, accommodating an input voltage range of ±2.5 V. Key specifications include a typical signal-to-noise ratio of 78 dB, a maximum differential nonlinearity of ±1 LSB, and a typical power consumption of 70 mW in normal mode. It utilizes a high-speed parallel interface for data transfer.

Feature Summary

• Simultaneous sampling and conversion across two independent channels to preserve relative phase information between inputs.
• Integrated internal 2.5 V reference voltage source with provision for external reference connection.
• Automatic power-down mode that minimizes energy consumption between conversion cycles.
• Analog input overvoltage protection allowing tolerance up to ±7 V without damage.

Applications

• Vector motor control systems requiring precise phase tracking.
• Battery-powered or portable instrumentation due to low power operation.
• Industrial signal processing applications utilizing standard bipolar input ranges.

Procurement Notes

Verify the specific suffix AR-3 confirms the ±2.5 V input range variant before procurement. Confirm package type availability matches system requirements, as the component is offered in SOIC_W and SSOP formats. Ensure logic levels align with the host microprocessor interface. Check for RoHS compliance status if required by manufacturing standards.

Selection Notes

Select this component when simultaneous channel sampling is critical for phase-sensitive applications. Choose the AD7863AR-3 specifically for signals within the ±2.5 V range; use other variants for different voltage spans. Consider the parallel interface complexity versus serial alternatives if pin count is constrained. Evaluate the 175 kSPS throughput against system bandwidth requirements.

Part Context

The AD7863 serves as a 14-bit upgrade to the 12-bit AD7862 family while maintaining pin compatibility. It belongs to the AD7863 series, which includes variants with different input ranges such as the AD7863-10 for ±10 V and AD7863-2 for unipolar applications. This architecture allows designers to scale resolution without redesigning the PCB footprint.

Replacement Considerations

The AD7862 offers similar functionality but with 12-bit resolution. Verify interface compatibility and resolution requirements when substituting. No direct pin-for-pin replacements with higher performance are documented in the provided datasheet.