AD7804BRZ

Overview

The AD7804BRZ is a quad 10-bit digital-to-analog converter (DAC) manufactured by Analog Devices Inc. It operates from a single +3.3 V to +5 V power supply and features serial loading capabilities via an SPI-compatible interface. The device incorporates an on-chip bandgap reference outputting approximately 1.23 V, though it supports dual external references. Key electrical specifications include a maximum settling time of 4 ms (typically 1.5 ms), a gain error of ±3% FSR, and a differential nonlinearity of ±0.125 LSB. It provides four buffered voltage outputs with double-buffered data registers for simultaneous updates.

Feature Summary

• Quad 10-bit resolution with serial input interface
• Integrated 1.23 V bandgap reference and dual external reference capability
• Double-buffered DAC registers allowing simultaneous analog output updates
• On-chip control registers for individual channel standby, clear, and power-down modes

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 BRZ suffix indicates a 16-lead Small Outline IC (SOIC). Confirm that the serial interface timing requirements, specifically FSIN setup and hold times, align with the host microcontroller's clock speeds. Ensure power supply decoupling is adequate given the internal reference characteristics.

Selection Notes

Select the AD7804BRZ when a quad-channel configuration with serial connectivity is required. Compare against the AD7805BRZ if parallel loading is preferred instead of serial. Verify that the 10-bit resolution and ±3% FSR gain error meet the system accuracy requirements. Check that the operating temperature range of -40°C to +85°C covers the application environment.

Part Context

The AD7804BRZ belongs to the AD7804/AD7805/AD7808/AD7809 family of 10-bit DACs. The AD7804 variant specifically denotes the quad-channel version with serial loading. Other family members include the octal versions (AD7808/AD7809) and the parallel-loading variants (AD7805/AD7809). All share similar internal architectures and control logic but differ in channel count and data input methods.

Replacement Considerations

The AD7805BRZ is a direct functional substitute if parallel loading is acceptable instead of serial. For octal configurations, the AD7808BRZ offers eight channels with serial loading. No other specific cross-model replacements are documented in the provided datasheet.