AD7890AR-4REEL

ADCs/DACs - Special Purpose Overview

The AD7890AR-4REEL is an 8-channel, 12-bit serial data acquisition system manufactured by Analog Devices Inc. It integrates an input multiplexer, a track/hold amplifier, a high-speed ADC, and a 2.5 V reference on a single chip. Operating from a single 5 V supply, this specific variant supports an analog input range of 0 V to 4.096 V. The device features a conversion time of 5.9 μs maximum and operates within a temperature range of -40°C to +85°C. It utilizes a flexible serial interface for communication with microcontrollers and DSPs.

ADCs/DACs - Special Purpose Feature Summary

• Integrates 8 single-ended analog input channels with a 12-bit SAR ADC and 2.5 V internal reference.
• Supports unipolar input voltage range of 0 V to 4.096 V with straight binary output coding.
• Features separate access to the multiplexer output (MUX OUT) and ADC input (SHA IN) for external signal conditioning.
• Operates in self-clocking or external clocking modes via a high-speed serial interface.

ADCs/DACs - Special Purpose Applications

• Industrial process control systems requiring multi-channel data acquisition.
• Data logging applications with moderate speed requirements.
• Embedded sensor interfaces connecting to microcontrollers or DSPs.

ADCs/DACs - Special Purpose Procurement Notes

Verify that the required analog input range matches the 0 V to 4.096 V specification of the AD7890-4 variant. Confirm the package type corresponds to the SOIC_W form factor associated with the AR suffix. Ensure the design accounts for the specified operating temperature range of -40°C to +85°C.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7890AR-4REEL when an 8-channel multiplexed system with a 0 V to 4.096 V input range is needed. Choose this part over the AD7890-10 if bipolar inputs are not required, or over the AD7890-2 if a wider dynamic range up to 4.096 V is necessary. The REEL suffix indicates tape and reel packaging suitable for automated assembly.

ADCs/DACs - Special Purpose Part Context

The AD7890 belongs to a family of LC2MOS data acquisition systems fabricated using Linear Compatible CMOS technology. This process combines precision bipolar circuits with low-power CMOS logic. The AD7890AR-4REEL is the surface-mount, 0 V to 4.096 V version of the broader AD7890 series, which also includes variants for ±10 V and 0 V to 2.5 V ranges.

ADCs/DACs - Special Purpose Replacement Considerations

Direct pin-compatible replacements within the same family include the AD7890AR-10REEL for bipolar inputs and the AD7890AR-2REEL for lower voltage ranges. Verify that the input range and output coding (straight binary) match the system requirements before substitution.