AD7851KRZ-REEL

Overview

The AD7851KRZ-REEL is a 14-bit, serial sampling Analog-to-Digital Converter (ADC) manufactured by Analog Devices Inc. It operates from a single 5 V supply and supports a throughput rate of 285 kSPS at the K grade. The device features a pseudo-differential input 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 ADC utilizes a flexible serial interface compatible with SPI, QSPI, and 8051 protocols. It is housed in a 24-lead SSOP package and is designed for low-power applications, consuming typically 60 mW in normal mode.

Feature Summary

• Integrated self-calibration and system calibration mechanisms ensure long-term accuracy and temperature stability.
• Flexible serial interface supports multiple communication protocols including SPI, QSPI, and 8051 compatibility.
• Pseudo-differential analog input architecture provides two distinct input voltage range options.
• Low power consumption design includes a dedicated sleep mode for energy-efficient operation.

Applications

• Digital Signal Processing systems
• Speech Recognition and Synthesis equipment
• Spectrum Analysis instruments
• DSP Servo Control loops
• Instrumentation and Control Systems

Procurement Notes

Verify the specific ordering suffix REEL indicates tape-and-reel packaging when sourcing this component. Confirm that the KRZ designation corresponds to the K grade performance specifications and lead-free construction. Ensure the supplier documentation matches the 24-lead SSOP package outline dimensions provided in the official datasheet to guarantee mechanical compatibility during assembly.

Selection Notes

Select the AD7851KRZ-REEL when a 285 kSPS throughput rate is sufficient for the application requirements. This model is appropriate for environments operating between 0°C and 85°C. Consider the K grade linearity specifications if tighter integral nonlinearity tolerances are required compared to the A grade variant. Evaluate the power-down modes if system energy efficiency is a critical design constraint.

Part Context

The AD7851 series represents a family of high-speed, 14-bit serial ADCs from Analog Devices. The KRZ-REEL variant specifically denotes the K grade version packaged in a 24-lead SSOP format and supplied in a reel configuration. This part belongs to the broader AD7851 product line which also includes PDIP and SOIC package options with varying thermal grades and throughput capabilities.

Replacement Considerations

The AD7851ARZ-REEL serves as a direct functional replacement offering identical pinout and interface characteristics but with an extended temperature range and higher throughput rate. Designers should verify that the increased speed and thermal tolerance of the ARZ variant do not introduce unintended power or timing implications in the existing circuit design.