AD7890SQ-4

ADCs/DACs - Special Purpose Overview

The AD7890SQ-4 is an 8-channel, 12-bit data acquisition system fabricated in LC2MOS technology. It integrates a multiplexer, track/hold amplifier, ADC, and 2.5 V reference on a single chip. Operating from a single 5 V supply, this specific variant supports a unipolar input voltage range of 0 V to 4.096 V. The device features a high-speed serial interface and achieves a maximum conversion time of 5.9 µs. It is housed in a 24-lead plastic dual-in-line package (DIP) and operates within an extended temperature range of -55°C to +125°C.

ADCs/DACs - Special Purpose Feature Summary

• Integrated 8-channel multiplexer with separate access to MUX OUT for external signal conditioning
• On-chip 2.5 V reference and track/hold amplifier
• High-speed bidirectional serial interface compatible with microcontrollers and DSPs
• Low power consumption: 30 mW typical in normal mode, 75 µW typical in standby

ADCs/DACs - Special Purpose Applications

• Industrial process control systems requiring multi-channel data acquisition
• Data logging applications with moderate speed requirements
• Remote monitoring stations utilizing serial communication interfaces
• Battery-powered instrumentation benefiting from low standby power

ADCs/DACs - Special Purpose Procurement Notes

Verify the S suffix indicates the extended temperature grade (-55°C to +125°C). Confirm the -4 suffix specifies the 0 V to 4.096 V input range. Ensure the DIP-24 package matches the target PCB footprint. Check RoHS compliance status as older manufacturing runs may vary.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7890SQ-4 when an extended industrial temperature range is required alongside a unipolar 0–4.096 V input window. Compare against the AD7890ANZ-4 if a commercial temperature range (-40°C to +85°C) suffices. Consider the SOIC_W package variants if surface mount assembly is preferred over through-hole DIP mounting.

ADCs/DACs - Special Purpose Part Context

The AD7890 belongs to Analog Devices' specialized data acquisition family. The SQ-4 designation combines the S version's extended temperature rating with the -4 input range specification. This component serves as a complete system-on-a-chip solution, reducing board space compared to discrete multiplexer and ADC combinations.

ADCs/DACs - Special Purpose Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify pin compatibility and electrical specifications before considering alternative manufacturers or updated Analog Devices series.