AD7856KR-REEL7

Overview

The AD7856KR-REEL7 is a high-speed, low-power 14-bit analog-to-digital converter manufactured by Analog Devices Inc. It operates from a single 5 V supply and supports an input throughput rate of 285 kSPS. The device features eight single-ended or four pseudo-differential analog input channels. It incorporates self-calibration and system calibration capabilities with autocalibration on power-up to maintain accuracy over time and temperature variations. The component utilizes a flexible serial interface compatible with SPI, QSPI, 8051, and microprocessor systems. Power management includes automatic power-down after conversion, reducing typical dissipation to 2.5 mW.

Feature Summary

• Supports eight single-ended or four pseudo-differential input channels for versatile signal acquisition.
• Integrates self-calibration and system calibration functions with automatic initialization upon power-up.
• Features flexible serial I/O port compatibility with standard protocols including SPI, QSPI, and 8051 interfaces.
• Provides multiple power-down modes including automatic shutdown after conversion to minimize energy consumption.

Applications

• Battery-powered systems such as personal digital assistants and mobile communications devices
• Pen computers requiring portable data acquisition capabilities
• Instrumentation and control systems needing precise analog signal digitization
• High-speed modems utilizing fast sampling rates

Procurement Notes

Verify the specific K grade designation ensures compliance with the commercial temperature range of 0°C to +105°C. Confirm that the REEL7 suffix indicates tape-and-reel packaging suitable for automated assembly processes. Cross-reference the manufacturer part number with official Analog Devices documentation to ensure authenticity and correct revision level before integration into production designs.

Selection Notes

Select this component when a 14-bit resolution and 285 kSPS throughput are required within a single 5 V supply architecture. Ensure the application environment falls within the specified 0°C to +105°C operating temperature range for the K version. Verify that the serial interface requirements align with the supported SPI, QSPI, or 8051 modes. Consider the power-down features if battery life optimization is a critical design constraint.

Part Context

The AD7856 series comprises 14-bit successive approximation ADCs designed for low-power applications. The KR variant specifically denotes the SOIC-24 package option within the broader family. This model serves as a cost-effective solution for multi-channel data acquisition tasks where moderate speed and high accuracy are balanced against power constraints in industrial and consumer electronics.

Replacement Considerations

Direct substitutes include other models within the AD7856 family such as the AD7856AN or AD7856AR, depending on the required package type and temperature grade. Evaluate pin compatibility and electrical specifications when considering alternative manufacturers' components to ensure functional equivalence in existing circuit layouts.