AD7804BR-REEL

Overview

The AD7804BR-REEL is a quad 10-bit digital-to-analog converter (DAC) from Analog Devices, featuring serial 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 for simultaneous analog updates via the LDAC input. Key electrical specifications include a typical settling time of 1.5 ms, a maximum relative accuracy of 3 LSBs, and a differential nonlinearity of ±0.125 LSB. Power consumption is 66 mW in normal mode, reducing to 4.4 mW in power-down mode.

Feature Summary

• Quad 10-bit resolution with integrated control registers for individual channel management
• Serial interface utilizing FSIN, CLKIN, and SDIN lines for data input
• On-chip 1.23 V reference with dual external reference capability via REFIN
• Double-buffered data registers allowing simultaneous multi-channel updates

Applications

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

Procurement Notes

Verify the 'REEL' suffix indicates tape-and-reel packaging rather than tube packaging when sourcing components. Confirm the B grade designation corresponds to the specified 3 LSB relative accuracy and -40°C to +85°C operating temperature range. Ensure compatibility with the required serial clock frequencies and logic levels for the specific system design.

Selection Notes

Select this component for designs requiring four independent 10-bit outputs with minimal pin count due to the serial interface. Consider the internal reference stability and the ability to shift transfer functions using the Sub DAC if precise offset adjustments are needed. Verify that the 2 kΩ minimum load resistance requirement aligns with the downstream circuit impedance.

Part Context

This part belongs to the AD7804/AD7805/AD7808/AD7809 family of CMOS DACs. While the AD7804 offers serial loading, the AD7805 provides parallel loading for the same quad configuration. Higher channel counts are available in the octal variants, the AD7808 (serial) and AD7809 (parallel), which share similar architectural features and performance characteristics.

Replacement Considerations

The AD7805BR serves as a functional alternative for designs requiring parallel data loading instead of serial interfaces. For applications needing higher channel density, the AD7808BR provides eight channels with identical serial control protocols.