AD7890BN-2

ADCs/DACs - Special Purpose Overview

The AD7890BN-2 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, the AD7890-2 variant accepts unipolar analog input voltages ranging from 0 V to 2.5 V. The device features a high-speed serial interface for microcontroller connectivity and supports both self-clocking and external clocking modes. Maximum power dissipation is 50 mW in normal operation, with a typical standby power of 75 μW.

ADCs/DACs - Special Purpose Feature Summary

• 8 single-ended analog input channels with 0 V to 2.5 V input range
• 12-bit resolution with 5.9 μs maximum conversion time
• Integrated 2.5 V voltage reference and track/hold amplifier
• High-speed bidirectional serial interface compatible with DSPs and microcontrollers

ADCs/DACs - Special Purpose Applications

• Industrial process control systems requiring multi-channel signal acquisition
• Data logging equipment with low-power requirements
• Remote monitoring stations utilizing serial communication interfaces

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'BN' against official Analog Devices documentation to confirm package type and temperature grade. Ensure the '-2' designation matches the required 0 V to 2.5 V input range for the application. Confirm RoHS compliance status if environmental regulations apply to the manufacturing site.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7890BN-2 when a unipolar 0 V to 2.5 V input range is required. Choose this part over the -4 or -10 variants if the signal levels do not exceed 2.5 V. Consider the serial interface compatibility with the host processor's clocking capabilities, as the device supports both internal and external clock generation modes.

ADCs/DACs - Special Purpose Part Context

The AD7890 belongs to a family of monolithic data acquisition systems that combine multiplexing, conversion, and reference functions. The -2 suffix specifically denotes the unipolar input scaling configuration. This integration reduces board space and component count compared to discrete solutions using separate MUX, ADC, and reference ICs.

ADCs/DACs - Special Purpose Replacement Considerations

Direct pin-compatible replacements within the same family include AD7890ARZ-10 (±10 V range) and AD7890ANZ-4 (0–4.096 V range), provided the input voltage constraints are adjusted. Verify that the replacement part's input range matches the system design before substitution.