AD7805CRZ

Overview

The AD7805CRZ is a quad 10-bit digital-to-analog converter (DAC) from Analog Devices, featuring parallel data loading capabilities. It operates on a single +3.3 V to +5 V power supply and includes an integrated bandgap reference outputting approximately 1.23 V. The device contains four independent DAC channels with double-buffered data registers, allowing simultaneous updates via the LDAC input. Key performance specifications include a maximum settling time of 4 ms and a typical differential nonlinearity of 0.125 LSB. The component supports both internal and external reference configurations through the REFIN pin.

Feature Summary

• Quad 10-bit resolution with parallel interface for high-speed data loading
• Integrated system and channel control registers for individual or global configuration
• On-chip Sub-DAC allows shifting the transfer function around the VBIAS point
• Dual reference capability supporting both internal bandgap and external REFIN inputs

Applications

• Optical disk drives
• Instrumentation and communication systems
• Process control and voltage setpoint control
• Trim potentiometer replacement
• Automatic calibration circuits

Procurement Notes

Verify the C-grade accuracy specification, which indicates a relative accuracy of 3 LSB maximum, against design requirements. Confirm that the 28-lead SOIC package dimensions align with the PCB footprint. Ensure ESD precautions are observed during handling due to the CMOS construction sensitivity.

Selection Notes

Select this model over the AD7804BNZ if a parallel interface is required instead of serial loading. Verify that the 3 LSB accuracy meets the application tolerance, as the B-grade variant offers tighter specifications. Ensure the +3.3 V to +5 V supply range matches the system power architecture.

Part Context

The AD7805CRZ belongs to the AD7804/AD7805/AD7808/AD7809 family of 10-bit DACs. While the AD7804 and AD7808 utilize serial interfaces, the AD7805 and AD7809 variants support parallel data loading. The 'C' suffix denotes the commercial temperature grade (-40°C to +85°C) and specific accuracy class within the product line.

Replacement Considerations

The AD7805BRZ is a parameter-equivalent alternative offering improved accuracy (3 LSB max vs. unspecified in source for C-grade, though B-grade is typically tighter). The AD7805BNZ provides the same functionality in a PDIP-28 package.