AD7890AN-2

ADCs/DACs - Special Purpose Overview

The AD7890AN-2 is an 8-channel, 12-bit serial data acquisition system from Analog Devices. It integrates a multiplexer, track/hold amplifier, SAR ADC, and 2.5 V reference on a single chip. Designed for commercial temperature ranges (-40°C to +85°C), it operates from a single 5 V supply with a maximum power dissipation of 50 mW. The device features a 5.9 μs conversion time and supports an analog input range of 0 V to 2.5 V. It utilizes a high-speed serial interface for communication with microcontrollers and DSPs.

ADCs/DACs - Special Purpose Feature Summary

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

ADCs/DACs - Special Purpose Applications

• Industrial process control systems requiring multi-channel signal acquisition
• Data acquisition modules for factory automation
• Embedded measurement systems interfacing with digital signal processors

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'AN' against the manufacturer's current ordering guide to confirm package type (typically PDIP or SOIC) and lead-free status. Check availability as legacy components may have limited stock or be subject to discontinuation notices. Ensure the selected variant matches the required -40°C to +85°C commercial temperature rating.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7890AN-2 specifically when the application requires a unipolar input range of 0 V to 2.5 V. For bipolar ±10 V inputs, use the AD7890-10 variant; for 0 V to 4.096 V, use the AD7890-4. Confirm that the serial interface timing requirements align with the host microcontroller or DSP capabilities, particularly regarding self-clocking versus external clocking modes.

ADCs/DACs - Special Purpose Part Context

The AD7890 belongs to a family of monolithic data acquisition systems fabricated using Linear Compatible CMOS (LC2MOS) technology. This process combines precision bipolar circuits with low-power CMOS logic. The device is part of a broader series differentiated by input voltage ranges and temperature grades, serving as a complete System-on-a-Chip solution for 12-bit acquisition tasks.

ADCs/DACs - Special Purpose Replacement Considerations

Direct pin-compatible replacements within the same family include AD7890AN-4 (0–4.096 V range) and AD7890AN-10 (±10 V range). Verify that the replacement variant's input range matches the signal conditioning circuitry to prevent damage or saturation.