AD7851ARZ

Overview

The AD7851ARZ is a high-speed, 14-bit successive approximation register (SAR) analog-to-digital converter manufactured by Analog Devices. It operates from a single 5 V supply and supports throughput rates of up to 333 kSPS in the A grade and 285 kSPS in the K grade. The device features a pseudo-differential input architecture with two selectable voltage ranges: 0 V to VREF and ±VREF/2. It incorporates internal self-calibration and system calibration capabilities 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

• Integrated self-calibration and system calibration mechanisms ensure long-term stability and precision across operating temperatures.
• Flexible serial communication interface supports multiple standard protocols including SPI, QSPI, and 8051 compatibility.
• Pseudo-differential input structure provides two distinct input voltage ranges for versatile signal conditioning applications.

Applications

• Digital Signal Processing
• Speech Recognition and Synthesis
• Spectrum Analysis
• DSP Servo Control
• Instrumentation and Control Systems

Procurement Notes

Verify the specific grade (A or K) required for your application, as throughput rates differ between versions. Confirm that the 24-lead SOIC package aligns with your PCB footprint requirements. Ensure power supply rails are stable within the 4.75 V to 5.25 V range to meet specified performance metrics. Check for RoHS compliance status if environmental regulations apply to your manufacturing process.

Selection Notes

Select the AD7851ARZ when a 14-bit resolution and high sampling rate are necessary for single-channel acquisition. Consider the A grade for maximum throughput at 333 kSPS or the K grade if operation within a commercial temperature range suffices. Evaluate the need for on-chip calibration to simplify external circuitry. Ensure the host microcontroller supports the desired serial interface mode for efficient data transfer.

Part Context

The AD7851 belongs to Analog Devices' family of high-speed serial ADCs designed for precision data acquisition. It complements other SAR converters by offering integrated calibration and a robust serial interface. The ARZ suffix indicates a lead-free, RoHS-compliant variant packaged in a standard 24-lead SOIC format, suitable for surface-mount assembly processes.

Replacement Considerations

Direct pin-compatible alternatives within the same series include the AD7851AR and AD7851ARS. Verify that substitute parts match the required linearity specifications and throughput rates for your specific design constraints.