AD7890ARZ-4

ADCs/DACs - Special Purpose Overview

The AD7890ARZ-4 is an 8-channel, 12-bit serial data acquisition system manufactured by Analog Devices. It integrates a multiplexer, track/hold amplifier, ADC, and 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. It utilizes a high-speed bidirectional serial interface for control and data output.

ADCs/DACs - Special Purpose Feature Summary

• 8 single-ended analog input channels with separate access to the multiplexer output
• Integrated 2.5 V voltage reference and track/hold amplifier
• High-speed serial interface compatible with microcontrollers and DSPs
• Low power consumption: 50 mW max (normal), 75 μW typ (standby)

ADCs/DACs - Special Purpose Applications

• Industrial process control systems requiring multi-channel signal acquisition
• Data logging applications with moderate speed requirements
• Embedded measurement systems interfacing via serial ports

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix '4' indicates the 0 V to 4.096 V input range variant. Confirm package type matches design requirements, as the ARZ suffix denotes SOIC_W packaging. Check current availability status through authorized distributors, as lead times may vary based on production schedules.

ADCs/DACs - Special Purpose Selection Notes

Select this component when an 8-channel multiplexed input is required with a unipolar 0–4.096 V range. Ensure the system clock frequency does not exceed 2.5 MHz for specified performance. Verify that the serial interface timing aligns with the host microcontroller or DSP capabilities.

ADCs/DACs - Special Purpose Part Context

The AD7890 belongs to a family of monolithic data acquisition systems available in different input ranges (-10, -4, -2) and packages (PDIP, SOIC). The ARZ-4 variant specifically combines the surface-mount SOIC package with the 0–4.096 V input scaling option.

ADCs/DACs - Special Purpose Replacement Considerations

Direct pin-compatible replacements within the same family include AD7890ARZ-10 (±10 V range) and AD7890ARZ-2 (0–2.5 V range). Cross-family replacements require verification of pinout compatibility and software register mapping.