AD7863ARS-10REEL7

Overview

The AD7863ARS-10REEL7 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 and conversion channels with four analog inputs grouped into Channel A and Channel B. The device provides a high-speed parallel interface and includes an internal 2.5 V reference. Key specifications include a maximum conversion time of 5.2 μs, a typical power consumption of 70 mW in normal mode, and a maximum power dissipation of 94.5 mW for the ±10 V input range version. It supports an operating temperature range from -40°C to +85°C.

Feature Summary

• Simultaneous sampling and conversion of two independent channels to preserve relative phase information between signals.
• Integrated internal 2.5 V voltage reference with provision for external reference connection.
• High-speed parallel data interface compatible with standard microprocessor control logic.
• Automatic power-down mode that minimizes energy consumption between conversion cycles.

Applications

• Vector motor control systems requiring precise phase measurement.
• Battery-powered or portable instrumentation due to low power operation.
• Industrial signal processing applications utilizing standard ±10 V input ranges.

Procurement Notes

Verify the specific suffix 'ARS-10REEL7' against the manufacturer's current ordering guide to confirm package type and reel configuration. Ensure the selected variant matches the required analog input range specification for your application design.

Selection Notes

Select this component when simultaneous channel sampling is critical for maintaining signal phase relationships. Consider the ±10 V input range capability if interfacing directly with standard industrial sensors without additional attenuation circuitry.

Part Context

This part belongs to the AD7863 family, which serves as a 14-bit upgrade to the AD7862 series. It utilizes Linear Compatible CMOS (LC2MOS) technology to combine precision bipolar circuits with low-power CMOS logic, offering improved performance over previous generations.

Replacement Considerations

The AD7862 is a related predecessor model. Verify pin compatibility and check if the lower resolution or different sampling characteristics of alternative parts meet the system requirements before substitution.

FAQ

How does the device handle simultaneous sampling?

A single CONVST signal places both track-and-hold amplifiers into hold mode simultaneously, initiating conversion on both channels at the same time to preserve phase information.

What is the function of the A0 input pin?

The A0 multiplexer select input determines which pair of channels is converted. If A0 is low, Channel A (VA1/VA2) is selected; if high, Channel B (VB1/VB2) is selected.

Can the internal reference be used externally?

Yes, the internal 2.5 V reference is available at the VREF pin, but it should be buffered externally because the output has a nominal source impedance of 5.5 kΩ.