AD7805BN

Overview

The AD7805BN 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 (typically 1.5 ms), a typical differential nonlinearity of ±0.125 LSB, and a normal mode current consumption of 12 mA. It supports both two's complement and offset binary input coding.

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 multi-channel updates
• On-chip control registers for individual channel standby, clear, and power-down modes

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 specific suffix 'BN' corresponds to the 28-lead Plastic DIP (N-28) package as defined in the ordering guide. Confirm that the B-grade accuracy specification of ±3 LSB relative accuracy meets the design requirements. Check current availability status, as older CMOS components may have limited production runs or end-of-life notifications.

Selection Notes

Select the AD7805BN when a parallel interface is preferred over serial options like the AD7804. Ensure the system requires four independent 10-bit outputs within a single package. Verify that the ±3.3 V to 5 V supply range aligns with the target application's power architecture. Consider the 2 kΩ minimum load resistance requirement for the analog outputs during circuit design.

Part Context

The AD7805BN belongs to the AD780x family of low-power CMOS DACs manufactured by Analog Devices. This family distinguishes between serial loading (AD7804/AD7808) and parallel loading (AD7805/AD7809) variants, as well as quad (AD7804/AD7805) and octal (AD7808/AD7809) channel counts. The 'B' grade indicates a relative accuracy of ±3 LSB, while the 'N' suffix denotes the plastic DIP package style.

Replacement Considerations

The AD7805BR serves as a surface-mount alternative using the 28-lead SOIC package. For applications requiring fewer channels, the AD7804BN provides a quad 10-bit serial-loaded equivalent. If higher accuracy is required, the C-grade versions offer improved linearity specifications but maintain the same pinout and functionality.