AD7890SQ-10

ADCs/DACs - Special Purpose Overview

The AD7890SQ-10 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, it operates from a single 5 V supply with a maximum power dissipation of 50 mW. The device supports an analog input range of ±10 V and features a high-speed serial interface. Key electrical parameters include a maximum conversion time of 5.9 µs, a signal-to-noise ratio of 70 dB, and an operating temperature range of -55°C to +125°C.

ADCs/DACs - Special Purpose Feature Summary

• Extended temperature operation (-55°C to +125°C) suitable for harsh environments
• Integrated 8-channel multiplexer with separate access to MUX OUT for external filtering
• High-speed serial interface compatible with microcontrollers and DSPs
• Low power consumption: 30 mW typical in normal mode, 75 µW in standby

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 S suffix indicates the extended temperature grade (-55°C to +125°C). Confirm package availability (DIP or SOIC_W) matches the target design constraints. Check RoHS compliance status as older manufacturing runs may vary. Ensure the specific revision level meets long-term supply requirements.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7890SQ-10 when bipolar ±10 V inputs are required alongside extended temperature stability. Compare against the SQ-4 variant if unipolar 0–4.096 V ranges suffice, as they share the same package and interface characteristics. Verify that the 12-bit resolution and 100 kS/s sampling rate meet the application bandwidth needs.

ADCs/DACs - Special Purpose Part Context

The AD7890 series serves as a complete monolithic data acquisition solution. The 'S' designation specifically denotes the military/extended grade version, distinguishing it from the commercial A and B grades which operate between -40°C and +85°C. This part number represents the bipolar input variant within the family.

ADCs/DACs - Special Purpose Replacement Considerations

Direct replacements must match the S suffix for temperature rating. Consider AD7890BRZ-10 for commercial grade applications where lower cost is prioritized over extended temperature performance. Verify pin compatibility for DIP-24 or SOIC-24 packages.