AD7890AR-10

ADCs/DACs - Special Purpose Overview

The AD7890AR-10 is an 8-channel, 12-bit data acquisition system fabricated in LC2MOS technology. It integrates an input multiplexer, track/hold amplifier, SAR ADC, and a 2.5 V reference on a single chip. Operating from a single 5 V supply, the AD7890-10 variant accepts ±10 V analog inputs. The device features a high-speed serial interface and allows separate access to the multiplexer output for external signal conditioning. Key electrical parameters include a maximum conversion time of 5.9 μs, a typical power dissipation of 30 mW in normal mode, and a standby power consumption of 75 μW.

ADCs/DACs - Special Purpose Feature Summary

• Complete 12-bit Data Acquisition System-on-a-Chip with 8 single-ended channels
• Separate access to multiplexer output (MUX OUT) for external antialiasing filters
• High-speed bidirectional serial interface compatible with microcontrollers and DSPs
• On-chip 2.5 V reference and track/hold amplifier

ADCs/DACs - Special Purpose Applications

• Industrial process control systems requiring multi-channel signal acquisition
• Data logging applications with moderate speed requirements
• Embedded measurement systems interfacing with serial digital processors

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'AR' against the manufacturer's current ordering guide to confirm package type and temperature range. Confirm RoHS compliance status as legacy documentation may vary. Ensure the required input voltage range matches the -10 variant specifications before procurement.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7890AR-10 when bipolar ±10 V input ranges are required. Compare performance against the AD7890-4 or AD7890-2 if unipolar inputs suffice, as these offer different input resistances. Verify that the serial interface timing meets the host processor's clock requirements, specifically the self-clocking versus external clocking modes.

ADCs/DACs - Special Purpose Part Context

The AD7890 belongs to Analog Devices' LC2MOS family of data acquisition systems. It is part of a series that includes variants with different input ranges (-2, -4, -10) and packaging options (PDIP, SOIC). The AR suffix typically denotes a plastic small outline package with commercial temperature grading, distinct from ceramic or extended temperature versions.

ADCs/DACs - Special Purpose Replacement Considerations

Direct pin-compatible replacements within the same family include the AD7890ANZ-4 or AD7890BR-10REEL, depending on the required input range and packaging preference. Verify that any substitute maintains the 12-bit resolution and serial interface compatibility.