AD7569JR

ADCs/DACs - Special Purpose Overview

The AD7569JR is an 8-bit analog I/O system on a single monolithic chip, fabricated in Linear-Compatible CMOS (LC2MOS). It integrates a high-speed successive approximation ADC with a 2 µs conversion time and a track/hold with 200 kHz bandwidth. The device also includes an 8-bit DAC with an output buffer amplifier featuring a 1 µs settling time. A temperature-compensated 1.25 V bandgap reference provides precision for both converters. It operates on single or dual 5 V supplies, supporting unipolar (0 to +1.25 V/+2.5 V) or bipolar (±1.25 V/±2.5 V) ranges via the RANGE pin. Digital interfacing uses an 8-bit parallel port compatible with standard microprocessor control lines.

ADCs/DACs - Special Purpose Feature Summary

• Complete 8-bit Analog I/O System: Integrates SAR ADC, Track/Hold, DAC, and Output Amplifier on one chip.
• Fast Bus Interface: Bus access and relinquish times less than 75 ns; write pulse width less than 80 ns.
• On-Chip Bandgap Reference: Provides a stable 1.25 V reference for ADC and DAC without external components.
• Flexible Power Supply Options: Operates from single +5 V or dual ±5 V supplies to support various input/output voltage ranges.

ADCs/DACs - Special Purpose Applications

• Microprocessor-based data acquisition systems requiring integrated analog I/O.
• Industrial process control applications needing fast sampling and precise digital-to-analog conversion.
• Test and measurement equipment utilizing DSP-friendly dynamic specifications.

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'JR' corresponds to the SOIC-24 package and commercial temperature range (0°C to +70°C) as defined in the ordering guide. Confirm that the required interface timing meets the minimum WR pulse width of 80 ns and data access times specified for this grade. Ensure ESD precautions are observed during handling due to the sensitivity of the LC2MOS process.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7569JR when a single-chip solution for 8-bit analog input and output is required with fast microprocessor interfacing. Choose this model over the AD7669 if only a single DAC output is needed. Verify that the ±1 LSB relative accuracy and 2 µs conversion time meet system requirements. Consider the SOIC-24 package constraints for PCB layout and thermal dissipation limits of 450 mW.

ADCs/DACs - Special Purpose Part Context

The AD7569JR belongs to the AD7569/AD7669 family of complete analog I/O systems. The AD7569 variant features a single DAC, whereas the AD7669 includes two DACs. The 'J' suffix indicates the commercial temperature range (0°C to +70°C), and 'R' denotes the Small Outline SOIC package. This family eliminates the need for external component trimming by providing tightly specified overall system accuracy.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should verify compatibility with existing microprocessor bus timing and voltage levels if considering alternative 8-bit analog I/O chips.