AD7581CQ

ADCs/DACs - Special Purpose Overview

The AD7581CQ is an 8-bit, 8-channel Analog-to-Digital Converter (ADC) manufactured by Analog Devices Inc. It utilizes a Successive Approximation Register (SAR) architecture and features a CMOS microprocessor-compatible interface. The device operates on a single +5V power supply with a sampling rate of 1.5 kS/s. It accepts single-ended analog inputs within a range of -17 V to +17 V. Key electrical specifications include a maximum linear error of 0.731%, a differential nonlinearity (DNL) of +/- 0.875 LSB, and an integral nonlinearity (INL) of +/- 0.75 LSB. The component is housed in a 28-pin DIP package.

ADCs/DACs - Special Purpose Feature Summary

• 8-Bit Resolution with 8 Single-Ended Input Channels
• CMOS uP-Compatible Parallel Interface
• Wide Analog Input Voltage Range (-17 V to +17 V)
• Low Power Consumption (8 mW typical)

ADCs/DACs - Special Purpose Applications

• Data acquisition systems requiring multi-channel input
• Industrial process control instrumentation
• Portable battery-powered instruments

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'CQ' against the official Analog Devices datasheet to confirm the temperature grade and package variant. Ensure compatibility with existing PCB footprints for the 28-pin DIP configuration. Check for RoHS compliance status as older manufacturing runs may differ from current production standards.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7581CQ when an 8-bit resolution and 8-channel multiplexing capability are required at low sampling speeds. The wide input voltage range simplifies signal conditioning requirements compared to standard 0-5V ADCs. Consider the parallel interface complexity if interfacing with modern microcontrollers lacking sufficient GPIO lines.

ADCs/DACs - Special Purpose Part Context

The AD7581 belongs to the AD758x family of data-acquisition systems, which integrate an ADC, analog multiplexer, and reference driver. This family provides a complete solution for multi-channel monitoring applications, reducing the need for external switching components and reference voltage sources.

ADCs/DACs - Special Purpose Replacement Considerations

The MX7581CQ+ from Maxim Integrated is a pin-compatible alternative within the same functional family. Verify that the thermal characteristics and interface timing requirements of the substitute match the original design constraints.