AD7859APZ

Overview

The AD7859APZ 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 throughput rates up to 200 kSPS. The device features a flexible parallel interface compatible with both 16-bit and 8-bit data widths. Key performance specifications include a signal-to-noise ratio of 72 dB, integral nonlinearity of ±1 LSB, and differential nonlinearity of ±1 LSB. Power consumption is typically 15 mW at 3 V in normal mode, with options for automatic power-down after conversion.

Feature Summary

• Integrated self-calibration and system calibration mechanisms ensure long-term accuracy across varying temperatures and time.
• Flexible parallel I/O architecture allows configuration for either 16-bit word or 8-bit byte data transfers via the W/B pin.
• Multiple power management states including full power-down and partial power-down modes optimize energy efficiency for battery-powered applications.

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 component authenticity through official manufacturer channels or authorized distributors. Confirm RoHS compliance status and check for moisture sensitivity level requirements prior to soldering. Ensure the PLCC-44 package variant matches the target PCB footprint design constraints.

Selection Notes

Select this model when eight single-ended or pseudo-differential inputs are required within a compact surface-mount package. Consider the AD7859L variant if lower power consumption is prioritized over maximum throughput speed. Verify that the system clock frequency aligns with the specified master clock limits for optimal dynamic performance.

Part Context

This component belongs to the AD7859 family of high-speed, low-power ADCs. The APZ suffix indicates the plastic lead chip carrier (PLCC) package option. It serves as a versatile solution for embedded data acquisition tasks where moderate resolution and multi-channel capability are essential.

Replacement Considerations

The AD7859BSZ is a documented alternative within the same series offering similar electrical characteristics but housed in a PQFP-44 package. Verify pinout compatibility and thermal impedance differences before substituting.