AD7805BRSZ

Overview

The AD7805BRSZ 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 provides four buffered voltage outputs with a settling time of 4 µs maximum. Key static performance metrics include ±3 LSB relative accuracy and ±0.125 LSB differential nonlinearity for the main DAC. It supports double-buffered data inputs for simultaneous updates via the LDAC pin and includes control registers for individual channel standby, clear, and power-down modes.

Feature Summary

• Quad 10-bit resolution 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 Sub DAC for transfer function shifting around VBIAS

Applications

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

Procurement Notes

Verify the package designation 'R' corresponds to the 28-lead Small Outline IC (SOIC) as specified in the ordering guide. Confirm the suffix 'SZ' indicates RoHS compliance. Ensure the B grade accuracy specification matches the design requirements. Check current availability status through authorized distributors as stock levels fluctuate.

Selection Notes

Select the AD7805BRSZ when parallel loading is preferred over serial interfaces. Verify that the 10-bit resolution and ±3 LSB accuracy meet system precision needs. Ensure the operating temperature range of -40°C to +85°C is suitable for the environment. Consider the 2 kΩ minimum load resistance requirement for the buffered outputs.

Part Context

The AD7805 is part of the AD7804/AD7805/AD7808/AD7809 family of CMOS DACs. While the AD7804 offers serial loading, the AD7805 specifically provides parallel loading facilities. The 'B' grade denotes ±3 LSB relative accuracy, distinguishing it from the C grade which specifies ±4 LSB. The RS-28 package variant is the shrink small outline version.

Replacement Considerations

The AD7805BR is a direct equivalent without the RoHS suffix. For applications requiring serial input instead of parallel, the AD7804 series may be considered if interface timing allows. No other specific cross-model replacements are documented in the provided source material.