AD7851ARSZ

Overview

The AD7851ARSZ 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 SSOP package.

Feature Summary

• Integrated self-calibration and system calibration mechanisms ensure long-term accuracy and stability across operating temperatures.
• Flexible serial interface supports multiple communication protocols including SPI, QSPI, and 8051 for versatile microprocessor integration.
• Pseudo-differential input structure provides two distinct input voltage ranges to accommodate various signal conditioning requirements.

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 and linearity specifications differ between versions. Confirm that the SSOP-24 package aligns with your PCB footprint constraints. Ensure proper ESD handling procedures are followed during assembly, as the device is sensitive to electrostatic discharge. Cross-reference the ordering guide to confirm availability of the Z suffix for lead-free compliance if required by regulatory standards.

Selection Notes

Select the A grade version if operation at 333 kSPS within the –40°C to +85°C range is necessary. Choose the K grade for applications requiring tighter linearity specifications (±1 LSB INL) within the 0°C to 85°C range. Both grades support extended temperature operation up to 125°C at a reduced throughput of 238 kSPS. Consider the power-down modes if low power consumption is a critical design constraint.

Part Context

The AD7851 belongs to the AD7851 family of 14-bit serial ADCs from Analog Devices. It is designed for applications requiring moderate speed and high resolution. The ARSZ variant specifically denotes the SOIC or SSOP package option with lead-free construction. It serves as a component in data acquisition systems where serial connectivity simplifies digital interface routing compared to parallel ADCs.

Replacement Considerations

Direct replacements include other parts within the AD7851 family such as the AD7851AN (PDIP), AD7851AR (SOIC), and their reel variants. For pin-compatible alternatives with different performance characteristics, consult Analog Devices' broader ADC portfolio, ensuring interface compatibility and resolution requirements are met.