AD7856AR-REEL

Overview

The AD7856AR-REEL 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 a throughput rate of 285 kSPS. The device features eight single-ended or four pseudo-differential input channels with a flexible serial interface compatible with SPI, QSPI, and 8051 protocols. Key electrical parameters include a typical power dissipation of 60 mW in normal mode and 2.5 µW in automatic power-down. The unit utilizes a successive approximation register (SAR) architecture and includes self-calibration capabilities to maintain accuracy over temperature variations.

Feature Summary

• Supports eight single-ended or four pseudo-differential analog input channels.
• Includes self-calibration and system calibration options for long-term accuracy.
• Features automatic power-down after conversion to minimize energy consumption.
• Offers a versatile serial I/O port compatible with multiple standard interfaces.

Applications

• Battery-powered systems such as personal digital assistants and mobile communications devices.
• Medical instruments requiring precise signal acquisition.
• Instrumentation and control systems.
• High-speed modems.

Procurement Notes

Verify the specific grade version (A or K) required for your operating temperature range before ordering. Confirm that the REEL suffix matches your automated assembly equipment specifications. Ensure the component meets RoHS compliance requirements for your region. Check for any obsolescence notices from the manufacturer regarding this specific part number revision.

Selection Notes

Select the A version for operation between -40°C and +105°C, or the K version for 0°C to +105°C. Ensure the external reference voltage falls within the functional range of 1.2 V to VDD. Verify that the host microcontroller logic levels are compatible with the 5 V supply requirements. Consider the package type availability if using the reel format for surface mount assembly.

Part Context

This component belongs to the AD7856 series of 14-bit sampling ADCs. It is designed for applications requiring moderate speed and high resolution with low power consumption. The device integrates an internal reference and track-and-hold amplifier, reducing external component count compared to discrete solutions.

Replacement Considerations

Direct pin-compatible replacements within the same family include the AD7856AN, AD7856AR, and AD7856ARS. Note that the AD7851 offers similar performance but with only one channel. Verify thermal characteristics and interface timing compatibility when substituting with other SAR ADCs.