AD7863ARZ-2

Overview

The AD7863ARZ-2 is a dual-channel, 14-bit successive approximation analog-to-digital converter (ADC) from Analog Devices. It operates on a single 5 V supply and provides simultaneous sampling and conversion at a throughput rate of 175 kSPS. The device features four analog inputs grouped into two channels with an input range of 0 V to 2.5 V. Key specifications include a typical power consumption of 45 mW in normal mode, a maximum power dissipation of 57.75 mW, and a signal-to-noise ratio of 86.04 dB. It utilizes a high-speed parallel interface and includes overvoltage protection up to +7 V.

Feature Summary

• Simultaneous sampling and conversion across two channels preserves relative phase information between signals.
• Integrated internal 2.5 V reference voltage source eliminates the need for external components.
• Automatic power-down mode reduces power consumption significantly after each conversion cycle completes.
• Analog inputs feature overvoltage protection allowing operation beyond standard supply limits without damage.

Applications

• Battery-powered or portable applications requiring low power consumption
• Vector motor control systems
• Industrial data acquisition systems

Procurement Notes

Verify that the specific suffix '2' corresponds to the required 0 V to 2.5 V unipolar input range. Confirm package type availability matches the SOIC-28 requirement. Ensure the operating temperature range aligns with the specified -40°C to +85°C commercial grade. Check for moisture sensitivity levels if reflow soldering is planned.

Selection Notes

Select this component when simultaneous sampling of two channels is critical for phase-sensitive measurements. Choose the AD7863ARZ-2 specifically for unipolar 0 V to 2.5 V signal ranges; other variants exist for bipolar inputs. Consider the parallel interface requirements against available microprocessor or DSP resources. Evaluate the 175 kSPS throughput against system timing constraints.

Part Context

The AD7863 series serves as a 14-bit lead-compatible upgrade to the AD7862. It is fabricated using Linear Compatible CMOS (LC2MOS) technology, combining precision bipolar circuits with low-power CMOS logic. The device is designed to interface directly with various microprocessors and digital signal processors via its high-speed parallel bus.

Replacement Considerations

The AD7863ARZ-3 is a direct pin-compatible alternative offering a ±2.5 V bipolar input range instead of the unipolar range found in the AD7863ARZ-2. Both share identical packaging and core ADC architecture.