AD7805BRZ

Overview

The AD7805BRZ is a quad 10-bit digital-to-analog converter (DAC) manufactured by Analog Devices Inc., housed in a 28-lead SOIC package. It features parallel loading capabilities and operates from a +3.3 V to +5.5 V power supply with an on-chip reference. The device provides buffered voltage outputs centered around VBIAS, utilizing double-buffered data registers for simultaneous updates via the LDAC input. Key electrical parameters include a maximum relative accuracy of ±3 LSB, a settling time of 4 µs to 10 bits, and a typical glitch impulse of 1 nV-s. It supports both two's complement and offset binary coding schemes.

Feature Summary

• Quad 10-bit DAC architecture with parallel data interface
• Integrated 1.23 V bandgap reference and dual external reference capability
• Double-buffered DAC registers allowing simultaneous analog output updates
• On-chip control registers for individual channel standby, clear, and power-down modes

Applications

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

Procurement Notes

Verify the component authenticity through official Analog Devices channels or authorized distributors. Confirm the specific grade (B Grade) and package variant (SOIC-28) match the design requirements. Check for RoHS compliance status as indicated in current manufacturer documentation. Ensure ESD precautions are observed during handling due to the CMOS construction.

Selection Notes

Select the AD7805BRZ when a quad 10-bit resolution with parallel interface is required. Compare against the AD7804 if serial loading is preferred instead. Consider the B Grade specifications for accuracy requirements, noting the ±3 LSB relative accuracy limit. Verify that the 28-SOIC package dimensions fit the PCB layout constraints and that the operating temperature range of -40°C to +85°C meets environmental conditions.

Part Context

The AD7805BRZ belongs to the AD7804/AD7805/AD7808/AD7809 family of 10-bit DACs. The 'B' suffix denotes the commercial temperature grade (-40°C to +85°C), while 'RZ' indicates the lead-free 28-SOIC package. This model specifically offers parallel loading, distinguishing it from the serial-loaded AD7804 and octal variants like the AD7809.

Replacement Considerations

The AD7805CRZ is a verified alternative within the same family offering similar functionality but potentially different accuracy grades. Cross-reference pinouts and register maps to ensure compatibility before substitution.