AD7851KR

Overview

The AD7851KR is a 14-bit, high-speed serial 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 at 0°C to 85°C, with guaranteed performance up to 238 kSPS at 125°C. The device features a pseudo-differential input architecture with two selectable voltage ranges: 0 V to VREF and ±VREF/2. It incorporates system and self-calibration capabilities, including autocalibration on power-up, to maintain accuracy over temperature variations. The part utilizes a flexible serial interface compatible with SPI, QSPI, and 8051 protocols, housed in a 24-lead SOIC package.

Feature Summary

• Features integrated system and self-calibration mechanisms with automatic initialization upon power-up to ensure long-term accuracy.
• Supports multiple flexible serial communication interfaces including SPI, QSPI, and 8051 compatibility for versatile microprocessor integration.
• Provides dual pseudo-differential analog input ranges allowing selection between unipolar (0 V to VREF) and bipolar (±VREF/2) configurations.

Applications

• Digital signal processing systems requiring high-speed data acquisition
• Speech recognition and synthesis hardware
• Spectrum analysis equipment
• DSP servo control loops
• Instrumentation and industrial control systems

Procurement Notes

Verify the specific ordering suffix to confirm the package type and lead-free status. The 'KR' designation indicates the SOIC package and K grade temperature range. Confirm RoHS compliance if required by checking for the 'Z' suffix in the full part number. Ensure the procurement source provides valid manufacturer documentation to verify authenticity and revision level.

Selection Notes

Select the AD7851KR when a 14-bit resolution and 285 kSPS sampling rate are required within the commercial temperature range. Consider this component for applications needing pseudo-differential inputs and onboard calibration to minimize external precision components. Evaluate the serial interface requirements against available microcontroller protocols before finalizing the design.

Part Context

The AD7851KR belongs to the AD7851 family of 14-bit serial ADCs from Analog Devices. This series includes variants with different packages such as PDIP and SSOP, and grades A and K offering varying throughput rates and linearity specifications. The KR variant specifically denotes the K grade performance metrics packaged in a standard 24-lead small outline integrated circuit format.

Replacement Considerations

Direct replacements include other AD7851 variants such as AD7851AR or AD7851ARS depending on the required package style. Cross-brand alternatives must be evaluated for pin compatibility, serial interface timing, and calibration functionality to ensure seamless integration without schematic modifications.