AD7890ARZ-4REEL

ADCs/DACs - Special Purpose Overview

The AD7890ARZ-4REEL is an LC2MOS 8-channel, 12-bit serial data acquisition system manufactured by Analog Devices. It integrates an input multiplexer, track/hold amplifier, high-speed ADC, and a 2.5 V reference on a single chip. Operating from a single 5 V supply, it supports an analog input range of 0 V to 4.096 V. The device features a maximum conversion time of 5.9 μs and a typical power dissipation of 30 mW in normal mode, with a standby power consumption of 75 μW. It utilizes a high-speed bidirectional serial interface for communication.

ADCs/DACs - Special Purpose Feature Summary

• Complete 12-bit data acquisition system-on-a-chip with 8 single-ended analog input channels
• On-chip 2.5 V reference and track/hold amplifier with separate access to the multiplexer output
• High-speed serial interface compatible with microcontrollers and DSP processors
• 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 monitoring unipolar sensor signals
• Embedded systems interfacing with DSP or microcontroller serial ports

ADCs/DACs - Special Purpose Procurement Notes

Verify that the specific suffix '4' corresponds to the 0 V to 4.096 V input range variant. Confirm the 'REEL' designation indicates tape-and-reel packaging suitable for automated assembly. Ensure the 'A' version meets the required -40°C to +85°C operating temperature range for the application environment.

ADCs/DACs - Special Purpose Selection Notes

Select this component when an 8-channel multiplexed input is required with a unipolar voltage range up to 4.096 V. The AD7890-4 variant is appropriate for applications where the input signal does not exceed the internal reference voltage. Consider the external clocking capability if precise synchronization with a master system clock is necessary.

ADCs/DACs - Special Purpose Part Context

The AD7890 belongs to the AD7890 family of data acquisition systems. The ARZ-4REEL designation specifies the SOIC-24 surface-mount package, the commercial temperature grade (A version), the 0 V to 4.096 V input range, and reel packaging. Other variants include the AD7890-10 for bipolar ±10 V inputs and the AD7890-2 for 0 V to 2.5 V inputs.

ADCs/DACs - Special Purpose Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify pin compatibility and electrical specifications against other 8-channel SAR ADCs if cross-referencing is required.

ADCs/DACs - Special Purpose FAQ

What is the analog input voltage range for the AD7890-4?

The AD7890-4 variant accepts a unipolar analog input range of 0 V to 4.096 V.

How is the multiplexer output accessed?

The multiplexer output is available at Pin 13 (MUX OUT), allowing users to insert an external antialiasing filter between the multiplexer and the track/hold amplifier.

What is the maximum conversion time?

The maximum conversion time is 5.9 μs when the external clock frequency is 2.5 MHz.