AD7862ARZ-10REEL

Overview

The AD7862ARZ-10REEL is a dual 12-bit successive approximation analog-to-digital converter (ADC) from Analog Devices. It features two independent ADCs with simultaneous sampling capabilities across four single-ended input channels grouped into two selectable channels. The device operates on a single +5 V supply, consuming typically 60 mW in normal mode and 75 μW in standby. It includes an internal +2.5 V reference and offers overvoltage protection up to ±17 V for the ±10 V input range version. Data is accessed via a high-speed parallel interface.

Feature Summary

• Simultaneous sampling and conversion of two channels preserves relative phase information between inputs.
• Integrated track/hold amplifiers ensure accurate signal acquisition with tight aperture delay matching.
• High-speed parallel interface facilitates direct connection to microprocessors and DSPs.
• Automatic power-down mode reduces power consumption between conversion cycles.

Applications

• AC motor control systems
• Uninterrupted power supplies (UPS)
• Data acquisition systems

Procurement Notes

Verify that the REEL suffix indicates tape-and-reel packaging rather than tube packaging when sourcing components. Confirm the -10 designation corresponds to the ±10 V input voltage range specification. Ensure ESD precautions are observed during handling as the device is sensitive to electrostatic discharge.

Selection Notes

Select this component for applications requiring simultaneous sampling of two distinct signal paths with 12-bit resolution. The AD7862-10 variant is appropriate for standard industrial signals within the ±10 V range. Consider the AD7863 if a 14-bit upgrade path is needed, as it is pin-compatible.

Part Context

The AD7862 belongs to the AD7862 family of dual ADCs. It is fabricated using Analog Devices' LC2MOS process, combining precision bipolar circuits with low-power CMOS logic. The device is available in multiple packages including SOIC, SSOP, and DIP, with the ARZ-10REEL specifically denoting the SOIC package, commercial temperature grade, and reel packaging.

Replacement Considerations

The AD7863 is a 14-bit pin-compatible upgrade option for the AD7862 family.

FAQ

How does the AD7862 handle data reading for its four inputs?

The device groups four inputs into two channels (A and B). A single CONVST pulse initiates simultaneous conversion. The first read accesses the result from VA1 or VB1, and the second read accesses VA2 or VB2, controlled by the A0 multiplexer select input.

What is the function of the VREF pin?

The VREF pin provides access to the internal +2.5 V reference or allows connection of an external +2.5 V reference source. An internal capacitor connects this pin to AGND to utilize the on-chip reference.

What is the maximum throughput rate of the AD7862?

The AD7862 can operate at throughput rates up to 250 kSPS when operating in high sampling mode, provided read operations do not occur during conversion or the 300 ns prior to the next conversion.