AD7890BRZ-4

ADCs/DACs - Special Purpose Overview

The AD7890BRZ-4 is an 8-channel, 12-bit serial data acquisition system fabricated in LC2MOS technology. 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, the AD7890-4 variant accepts analog input ranges 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. Power consumption is typically 30 mW in normal mode and drops to 75 μW in standby.

ADCs/DACs - Special Purpose Feature Summary

• Integrated 8-channel multiplexer with separate access to MUX OUT for external antialiasing filtering
• On-chip 2.5 V voltage reference with external input capability
• High-speed bidirectional serial interface compatible with microcontrollers and DSPs
• Low power operation: 50 mW max (normal) and 75 μW typ (standby)

ADCs/DACs - Special Purpose Applications

• Industrial process control systems requiring multi-channel signal acquisition
• Data logging equipment with serial communication interfaces
• Battery-powered instrumentation utilizing low-power standby modes

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix '4' confirms the 0 V to 4.096 V unipolar input range. Confirm the 'B' version meets the -40°C to +85°C commercial temperature requirement. Ensure the package type matches the design constraints, as the BRZ designation indicates a surface-mount SOIC package.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7890BRZ-4 when a unipolar 0 V to 4.096 V input range is required. Choose this part over the AD7890-10 or AD7890-2 if the application signals do not exceed 4.096 V. Verify that the serial interface timing requirements align with the host processor's clock capabilities.

ADCs/DACs - Special Purpose Part Context

The AD7890 series includes variants with different input ranges: AD7890-10 for ±10 V, AD7890-4 for 0 V to 4.096 V, and AD7890-2 for 0 V to 2.5 V. All variants share the same core architecture, including the 12-bit SAR ADC and serial interface. The BRZ suffix denotes the RoHS-compliant SOIC_W package.

ADCs/DACs - Special Purpose Replacement Considerations

Direct pin-compatible replacements within the AD7890 family include AD7890ARZ-4 and AD7890ANZ-4, differing primarily in package style (SOIC vs. DIP). Cross-family replacements require verification of serial protocol compatibility and input voltage ranges.