AD7805CR-REEL7

Overview

The AD7805CR-REEL7 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 1.23 V bandgap reference. The device features double-buffered data inputs for simultaneous analog output updates via the LDAC pin. Each DAC channel includes a Sub DAC for transfer function shifting around the VBIAS point. Static performance specifications include a maximum relative accuracy of 3 LSBs and a gain error of 3% FSR. Power consumption is 12 mA max in normal mode, reducing to 0.8 mA in power-down mode.

Feature Summary

• Quad 10-bit resolution with parallel interface
• Integrated 1.23 V on-chip reference
• Dual external reference capability via REFIN
• Individual channel control registers for standby and clear functions

Applications

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

Procurement Notes

Verify the package type matches the required footprint, as the AD7805 series is available in PDIP, SOIC, SSOP, and TQFP configurations. Confirm that the 'C' grade designation meets the specific accuracy requirements, noting it shares the same static performance limits as the 'B' grade. Ensure ESD precautions are observed during handling due to the CMOS construction.

Selection Notes

Select the AD7805 over the AD7804 when a parallel interface is preferred over serial loading. Verify that the system can accommodate the 28-pin package size if using the SOIC or PDIP variants. Consider the internal reference's -100 ppm/°C temperature coefficient; if higher precision is needed, utilize the REFIN pin with an external reference source.

Part Context

The AD7805 is part of a family of low-power CMOS DACs that also includes the serial-loaded AD7804, the octal serial AD7808, and the octal parallel AD7809. All devices share similar electrical characteristics and control logic structures but differ in channel count and input interface method.

Replacement Considerations

Public confirmed substitute part numbers: None.