AD7890SQ-2

ADCs/DACs - Special Purpose Overview

The AD7890SQ-2 is an 8-channel, 12-bit data acquisition system fabricated in Analog Devices' LC2MOS process. It integrates a multiplexer, track/hold amplifier, ADC, and 2.5 V reference on a single chip. Designed for extended industrial environments, the S version operates from -55°C to +125°C. It accepts a single 5 V supply and supports an analog input range of 0 V to 2.5 V. The device features a high-speed serial interface and delivers a maximum conversion time of 5.9 μs with a typical power dissipation of 30 mW.

ADCs/DACs - Special Purpose Feature Summary

• Extended temperature range (-55°C to +125°C) for harsh environments
• Integrated 8-channel multiplexer with separate MUX OUT access
• On-chip 2.5 V voltage reference and track/hold amplifier
• High-speed bidirectional serial interface compatible with DSPs and microcontrollers

ADCs/DACs - Special Purpose Applications

• Industrial process control systems requiring wide temperature tolerance
• Data acquisition modules for remote monitoring stations
• Harsh environment sensor interfaces

ADCs/DACs - Special Purpose Procurement Notes

Verify the ordering suffix 'S' confirms the -55°C to +125°C operating range. Confirm the '-2' suffix indicates the 0 V to 2.5 V unipolar input range. Check package availability against required footprint (DIP or SOIC_W). Ensure external clocking or self-clocking mode requirements match the host controller capabilities.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7890SQ-2 when operation above +85°C is required, as A and B versions are limited to that threshold. The 0 V to 2.5 V input range suits low-voltage sensors directly. Verify that the 5.9 μs conversion speed meets system throughput needs. Consider the 30 mW typical power consumption for thermal management in enclosed designs.

ADCs/DACs - Special Purpose Part Context

The AD7890 family includes variants distinguished by temperature grade and input range. The 'A' and 'B' suffixes denote commercial ranges (-40°C to +85°C), while 'S' denotes the extended range. Input ranges include ±10 V, 0–4.096 V, and 0–2.5 V. This specific part combines the extended temperature grade with the lowest voltage input range.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitute part numbers: None.