AD7859ASZ

Overview

The AD7859ASZ is an 8-channel, 12-bit successive approximation register (SAR) analog-to-digital converter manufactured by Analog Devices. It operates from a single 3 V to 5.5 V supply and supports a throughput rate of 200 kSPS. The device features a flexible parallel interface compatible with both 16-bit and 8-bit data buses. Key electrical specifications include a signal-to-noise ratio of 70 dB, integral nonlinearity of ±1 LSB, and differential nonlinearity of ±1 LSB. Normal mode power dissipation is typically 15 mW at 3 V. The component is housed in a 44-pin plastic quad flatpack (PQFP) package.

Feature Summary

• Integrated self-calibration and system calibration mechanisms ensure long-term accuracy across temperature variations.
• Flexible power management architecture includes automatic power-down after conversion for optimized energy efficiency.
• Versatile parallel I/O port supports configurable 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 utilizing multi-channel sampling

Procurement Notes

Verify the specific suffix 'ASZ' against current manufacturer documentation to confirm package type and RoHS compliance status. Confirm availability as the component may be subject to obsolescence notices. Ensure the ordering information matches the required PQFP package variant before finalizing procurement.

Selection Notes

Select this component when an 8-channel multiplexed input is required alongside high-speed 12-bit resolution. Consider the AD7859L variant if lower power consumption is prioritized over maximum throughput speed. Verify that the system clock frequency aligns with the 4 MHz master clock requirement for optimal performance.

Part Context

This part belongs to the AD7859 family of high-speed, low-power ADCs. The family includes variants optimized for different performance trade-offs, such as the AD7859L which targets reduced power dissipation. The AD7859ASZ specifically denotes the standard speed version packaged in a PQFP format.

Replacement Considerations

The AD7859L serves as the low-power alternative within the same family. Other members of the AD7859 series offer similar functionality with potential differences in linearity error or package options.