AD7805BNZ

Overview

The AD7805BNZ is a quad 10-bit digital-to-analog converter (DAC) with parallel loading capabilities, manufactured by Analog Devices Inc. It operates from a +3.3 V to +5 V power supply and incorporates an on-chip bandgap reference outputting typically 1.23 V. The device features four independent DAC channels with double-buffered data inputs for simultaneous updates via the LDAC pin. Key electrical parameters include a maximum settling time of 4 ms (typically 1.5 ms), a gain error of ±3% FSR, and a relative accuracy of ±3 LSBs. It supports both two's complement and offset binary input coding schemes.

Feature Summary

• Quad 10-bit resolution with parallel data interface
• Integrated 1.23 V bandgap reference and internal voltage divider
• Double-buffered DAC registers allowing simultaneous analog output updates
• On-chip control registers for individual channel standby, clear, and VBIAS selection

Applications

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

Procurement Notes

Verify the package type matches the N-28 designation for the 28-Lead Plastic DIP configuration. Confirm that the B grade accuracy specifications meet the design requirements, as other grades like C exist with different accuracy tolerances. Ensure the system logic levels are compatible with the specified VIH and VIL thresholds for the selected supply voltage.

Selection Notes

Select this component when a quad-channel DAC with parallel interface is required. The AD7805 differs from the AD7804, which utilizes serial loading. Consider the AD7809 if octal (eight-channel) capacity is needed instead of quad. Verify that the load resistance meets the minimum requirement of 2 kΩ to ensure proper operation and accuracy specifications.

Part Context

The AD7805 belongs to the AD7804/AD7805/AD7808/AD7809 family of CMOS 10-bit DACs. While the AD7804 and AD7808 offer serial interfaces, the AD7805 and AD7809 provide parallel loading facilities. This specific part number represents the quad-channel variant in a plastic DIP package, sharing core architecture with the octal AD7809 but limited to four output channels.

Replacement Considerations

The AD7805BR serves as a surface-mount equivalent in the 28-Lead Small Outline IC package. For applications requiring higher accuracy, the AD7805CR offers improved specifications within the same parallel interface architecture.