AD7890BN-4

ADCs/DACs - Special Purpose Overview

The AD7890BN-4 is an 8-channel, 12-bit serial data acquisition system fabricated in LC2MOS technology. It integrates an input multiplexer, track/hold amplifier, ADC, and a 2.5 V reference on a single chip. Operating from a single 5 V supply, the AD7890-4 variant accepts unipolar analog inputs ranging from 0 V to 4.096 V. The device features a high-speed serial interface for microcontroller connectivity and supports separate access to the multiplexer output for external signal conditioning. Maximum power dissipation is 50 mW, with a typical standby current of 15 μA.

ADCs/DACs - Special Purpose Feature Summary

• Monolithic 12-bit ADC with 8 single-ended channels and 5.9 μs conversion time
• Unipolar input range of 0 V to 4.096 V (AD7890-4)
• Separate MUX OUT pin allows connection of a single external antialiasing filter
• On-chip 2.5 V reference with external reference input capability
• High-speed bidirectional serial interface compatible with DSPs and microcontrollers

ADCs/DACs - Special Purpose Applications

• Industrial process control systems requiring multi-channel data acquisition
• Data logging equipment with moderate speed requirements
• Remote monitoring stations utilizing low-power serial interfaces
• Test and measurement instrumentation

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'BN' against the manufacturer's ordering guide to confirm package type and temperature grade. Ensure the '-4' suffix matches the required 0 V to 4.096 V input range. Confirm RoHS compliance status as specifications may vary by manufacturing revision. Cross-reference the datasheet revision date to ensure timing parameters align with the design requirements.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7890BN-4 when an 8-channel multiplexed system is needed with a unipolar input range up to 4.096 V. The part is suitable for designs requiring a single external antialiasing filter due to the accessible MUX OUT pin. Consider the 5.9 μs conversion time and 100 kHz maximum sample rate for bandwidth limitations. Verify that the serial interface mode (self-clocking or external clocking) matches the host processor capabilities.

ADCs/DACs - Special Purpose Part Context

The AD7890 belongs to Analog Devices' specialized data acquisition family, combining precision bipolar circuits with CMOS logic in the LC2MOS process. The -4 designation specifically defines the unipolar voltage range, distinguishing it from the ±10 V (AD7890-10) and 0 V to 2.5 V (AD7890-2) variants within the same series.

ADCs/DACs - Special Purpose Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.