AD7859BSZ

Overview

The AD7859BSZ is an 8-channel, 12-bit successive approximation register (SAR) analog-to-digital converter manufactured by Analog Devices Inc. It operates from a single 3 V to 5.5 V supply and supports throughput rates up to 200 kSPS. The device features a flexible parallel interface supporting both 16-bit word and 8-bit byte transfers. Key electrical specifications include a signal-to-noise ratio of 71 dB, integral nonlinearity of ±0.5 LSB, and differential nonlinearity of ±1 LSB. Power consumption is typically 15 mW at 3 V in normal mode. It is housed in a 44-pin PQFP package and operates within a temperature range of -40°C to +85°C.

Feature Summary

• Integrated self-calibration and system calibration mechanisms ensure long-term accuracy across varying temperatures and time.
• Flexible power management architecture includes automatic power-down after conversion for optimized energy efficiency.
• Supports versatile parallel I/O with selectable 16-bit or 8-bit data transfer modes via the W/B pin.

Applications

• Battery-powered systems such as personal digital assistants and mobile communications devices
• Medical instruments requiring precise low-power data acquisition
• Instrumentation and control systems

Procurement Notes

Verify component authenticity through official manufacturer channels or authorized distributors. Confirm that the specific ordering suffix matches the required package type and temperature grade. Check current lifecycle status as manufacturing schedules may change. Ensure compliance with relevant environmental directives applicable to your region before integration.

Selection Notes

Select this model when eight analog input channels are required alongside high-speed sampling capabilities. Consider the AD7859L variant if lower power consumption is prioritized over maximum throughput speed. Verify that the system design accommodates the parallel interface requirements and the specified voltage levels for logic inputs and outputs.

Part Context

This component belongs to the AD7859 family of high-speed, low-power ADCs. The 'B' suffix indicates a specific performance grade regarding linearity error compared to other variants like the 'A' version. The 'SZ' designation identifies the plastic quad flatpack (PQFP) surface-mount package configuration used for board integration.

Replacement Considerations

The AD7859APZ serves as a functional equivalent offering identical electrical characteristics but utilizes a PLCC-44 package instead of PQFP. Designers must verify pinout compatibility and physical footprint differences when substituting between these package types.