AD7805CRZ-REEL

Overview

The AD7805CRZ-REEL is a quad 10-bit digital-to-analog converter (DAC) from Analog Devices, featuring parallel load capabilities. It operates on a single +3.3 V to +5 V power supply and incorporates an on-chip bandgap reference outputting typically 1.23 V. The device includes double-buffered data inputs for simultaneous analog updates via the LDAC pin. Key electrical specifications include a maximum settling time of 4 ms, a typical slew rate of 2.5 V/ms, and a normal mode current consumption of 18 mA. It supports both offset binary and two's complement input coding schemes.

Feature Summary

• Quad 10-bit resolution with parallel data interface
• Integrated 1.23 V internal reference with external REFIN capability
• Double-buffered DAC registers allowing simultaneous multi-channel updates
• On-chip control registers for individual channel standby, clear, and VBIAS selection

Applications

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

Procurement Notes

Verify the 'C' grade suffix indicates a relative accuracy of ±3 LSB max, distinct from the B grade. Confirm the REEL suffix denotes tape and reel packaging. Ensure the operating temperature range matches the commercial specification of -40°C to +85°C. Cross-reference the SOIC-28 package dimensions against the target PCB footprint.

Selection Notes

Select this model when parallel loading is required over serial interfaces. The C grade offers ±3 LSB relative accuracy. Consider the 18 mA normal mode current draw for power budgeting. The device supports dual external references if the internal 1.23 V reference is insufficient for specific swing requirements.

Part Context

This component belongs to the AD7804/AD7805/AD7808/AD7809 family of 10-bit DACs. The AD7805 variant specifically provides quad channels with parallel loading, whereas the AD7804 uses serial loading. The AD7808 and AD7809 variants offer octal configurations. All share similar internal architectures and control logic.

Replacement Considerations

The AD7805BRZ and AD7805BNZ are functionally equivalent parts within the same family but differ in accuracy grade (B grade: ±3 LSB vs. C grade: ±3 LSB) and packaging (SOIC vs. DIP). Verify that the accuracy specifications meet the application requirements before substituting.