AD7581BQ

ADCs/DACs - Special Purpose Overview

The AD7581BQ 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 with a single +5V power supply and supports an external reference voltage. Key electrical parameters include a maximum sampling rate of 1.5 kS/s, a maximum linear error of 0.731%, and a differential nonlinearity (DNL) of +/- 0.875 LSB. The component is housed in a 28-pin ceramic dual in-line package (CDIP) and is rated for operation within the military temperature range of -55°C to +125°C.

ADCs/DACs - Special Purpose Feature Summary

• 8-Bit Resolution with 8 Single-Ended Input Channels
• Successive Approximation (SAR) Architecture
• Military Temperature Range (-55°C to +125°C)
• CMOS uP-Compatible Parallel Interface

ADCs/DACs - Special Purpose Applications

• High-reliability data acquisition systems
• Military instrumentation and control
• Aerospace sensor interfaces

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'BQ' indicates the military grade variant with extended temperature range and ceramic packaging. Confirm RoHS compliance status as older military parts may not be compliant. Check for lead-free alternatives if required by current manufacturing standards. Ensure the external reference circuitry matches the ADC's input requirements for optimal accuracy.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7581BQ when high reliability and wide temperature operation are critical. Compare against the commercial AD7581KNZ for cost-sensitive applications where military specs are unnecessary. Consider the parallel interface complexity versus serial options like the AD7582 if pin count is constrained. Verify that the 1.5 kS/s sampling rate meets system bandwidth requirements.

ADCs/DACs - Special Purpose Part Context

The AD7581 series represents a family of multiplexed ADCs from Analog Devices. The 'BQ' suffix typically denotes the military-grade version packaged in a hermetic ceramic DIP, distinguishing it from the plastic DIP or surface-mount variants. This part shares architectural similarities with other SAR ADCs but is optimized for rugged environments.

ADCs/DACs - Special Purpose Replacement Considerations

Direct replacements include the AD7581KNZ for commercial grade use, though environmental ratings differ. The MX7581CQ+ from Maxim Integrated offers similar specifications but may require interface adjustments. Verify pin compatibility and thermal characteristics before substituting.