AD7805BRSZ-REEL7

Overview

The AD7805BRSZ-REEL7 is a quad 10-bit digital-to-analog converter (DAC) from Analog Devices, featuring parallel data loading capabilities. It operates on a single +3.3 V to +5 V power supply and incorporates an on-chip bandgap reference outputting approximately 1.23 V. The device includes double-buffered DAC registers allowing simultaneous analog updates via the LDAC input. Key electrical parameters include a typical settling time of 1.5 ms, a maximum power dissipation of 66 mW in normal mode, and an operating temperature range of -40°C to +85°C. It utilizes a 28-lead SSOP package.

Feature Summary

• Quad 10-bit resolution with parallel interface for high-speed data loading
• Integrated system and channel control registers for individual or global configuration
• On-chip Sub-DAC allows shifting the transfer function around the VBIAS point
• Supports Power-Down, System Standby, and Hardware Clear modes

Applications

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

Procurement Notes

Verify component authenticity through authorized distributors as counterfeit risks exist for legacy parts. Confirm the specific B-grade accuracy (-3 LSB max relative accuracy) matches design requirements. Check RoHS compliance status for current manufacturing batches. Ensure ESD precautions are observed during handling due to CMOS construction sensitivity.

Selection Notes

Select this model over serial variants (AD7804) when parallel bus availability is sufficient and faster update rates are needed. Consider the AD7809 if octal channels are required instead of quad. Verify that the 2 kΩ minimum load resistance constraint fits the application's output stage. Ensure the 1.23 V internal reference meets precision needs or plan for external REFIN usage if higher stability is required.

Part Context

This part belongs to the AD780x family of low-power CMOS DACs. The 'B' suffix indicates B-grade accuracy specifications. The 'R' in the package code denotes the Shrink Small Outline Package (SSOP). The '-REEL7' suffix specifies tape-and-reel packaging for automated assembly, distinct from cut-tape or tube options.

Replacement Considerations

Direct pin-compatible replacements within the same family include the AD7805BR (SOIC package) and AD7805BN (DIP package). For applications requiring octal channels, the AD7809 series is the functional equivalent. Serial-loading alternatives like the AD7804 offer similar performance but require different interface logic.