AD7863BR-10

Overview

The AD7863BR-10 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 inputs grouped into two channels (A and B), selectable via the A0 pin, with an input voltage range of ±10 V for the -10 suffix variant. It includes an internal 2.5 V reference, overvoltage protection up to ±17 V, and a high-speed parallel interface. Typical power consumption is 70 mW in normal mode, reducing to 105 μW maximum in power-down mode.

Feature Summary

• Simultaneous sampling and conversion of two independent channels to preserve relative phase information.
• Integrated track-and-hold amplifiers with tight aperture delay matching between channels.
• Internal 2.5 V reference with option for external reference connection.
• High-speed parallel data interface compatible with standard microprocessor control signals.

Applications

• Vector motor control systems requiring precise phase measurement.
• Industrial process control applications utilizing standard ±10 V signal ranges.
• Portable or battery-powered instrumentation benefiting from low-power operation.

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to confirm the exact input voltage range and package type. Ensure that the procurement documentation matches the required temperature grade and revision level. Cross-reference the part number with official distributor catalogs to validate availability and authenticity before finalizing orders.

Selection Notes

Select the AD7863BR-10 when a ±10 V input range is required alongside simultaneous dual-channel sampling. Compare performance metrics such as SNR and THD against alternative ADCs if higher resolution or faster throughput is needed. Consider the parallel interface requirements and ensure the host system can accommodate the 14-bit data bus width and timing constraints specified in the datasheet.

Part Context

The AD7863 series serves as a 14-bit lead-compatible upgrade to the AD7862 family. It utilizes Linear Compatible CMOS (LC2MOS) technology to combine precision bipolar circuits with low-power CMOS logic. The device is available in 28-lead SOIC_W and SSOP packages, designed for applications demanding high accuracy and speed in a compact form factor.

Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the source material. Verify compatibility with existing designs by comparing pinouts, electrical specifications, and interface protocols before considering alternative components.

FAQ

How does the AD7863 handle simultaneous sampling?

A single CONVST signal simultaneously places both track-and-hold amplifiers into hold mode and initiates conversion on both channels, preserving the relative phase information of the input signals.

What is the function of the A0 input pin?

The A0 pin acts as a multiplexer select input. When low, it selects channels VA1 and VA2; when high, it selects VB1 and VB2, determining which pair of inputs undergoes conversion.

Can an external reference be used instead of the internal one?

Yes, an external 2.5 V reference can be connected to the VREF pin. This effectively overdrives the internal reference, providing the reference source for the ADC.