AD7805BR

Overview

The AD7805BR 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 supply and incorporates an on-chip bandgap reference outputting typically 1.23 V. The device includes four buffered voltage outputs with double-buffered data registers for simultaneous updates via the LDAC input. Key electrical parameters include a maximum settling time of 4 ms, a typical slew rate of 2.5 V/ms, and a power dissipation of 66 mW in normal mode. It supports both internal and external reference inputs.

Feature Summary

• Quad 10-bit resolution with parallel loading interface
• On-chip 1.23 V bandgap reference with dual external reference capability
• Double-buffered DAC registers allowing simultaneous analog output updates
• Integrated 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 specific package variant, as the AD7805BR designation corresponds to the 28-lead Small Outline IC (SOIC). Confirm that the design requires parallel data inputs rather than serial interfaces found in the AD7804 series. Ensure the system power supply remains within the specified +3.3 V to +5.5 V range to maintain performance specifications.

Selection Notes

Select this component when a quad-channel DAC with parallel interface is required. The B-grade accuracy offers ±3 LSB relative accuracy and ±3% FSR gain error. Consider the AD7809 if octal channels are needed, or the AD7804/AD7808 if serial loading is preferred. Verify that the 4 ms settling time meets the application's speed requirements.

Part Context

The AD7805BR belongs to the AD7804/AD7805/AD7808/AD7809 family of CMOS DACs. While the AD7804 and AD7808 utilize serial interfaces, the AD7805 and AD7809 are designed for parallel data loading. This family shares common features such as low power consumption, power-down modes, and on-chip reference options, differing primarily in channel count and data interface type.

Replacement Considerations

The AD7805BRS is a shrink small outline package (SSOP) alternative with identical electrical characteristics. For applications requiring fewer channels, the AD7804BR provides a quad-channel serial-loaded option.