AD7808BR-REEL

Overview

The AD7808BR-REEL is an octal 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 integrates an on-chip bandgap reference outputting 1.23 V nominal. The device contains eight independent DAC channels with double-buffered data registers, allowing simultaneous updates via the LDAC input. Each channel includes control registers for individual standby and clear functions. The B-grade version guarantees ±4 LSB relative accuracy and monotonicity over the commercial temperature range of –40°C to +85°C.

Feature Summary

• Octal configuration with eight independent 10-bit DAC channels in a single package
• Serial interface utilizing FSIN, CLKIN, and SDIN lines for data and control input
• Integrated 1.23 V bandgap reference with dual external reference capability via REFIN
• Double-buffered DAC registers enabling simultaneous analog output updates

Applications

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

Procurement Notes

Verify the B-grade suffix indicates ±4 LSB relative accuracy. Confirm the REEL suffix corresponds to tape-and-reel packaging. Check current lifecycle status as older Analog Devices components may be discontinued or subject to obsolescence notices. Ensure ESD precautions are observed during handling due to CMOS construction sensitivity.

Selection Notes

Select this model when eight serially controlled analog outputs are required within a single footprint. Choose the BR package variant for surface-mount assembly. Verify that the +3.3 V to +5 V supply range aligns with system power rails. Consider the internal 1.23 V reference limitations; use the REFIN pin if higher precision or different reference voltages are needed for specific channel configurations.

Part Context

This component belongs to the AD780x family of low-power CMOS DACs. The AD7808 specifically provides the octal serial-loading variant, contrasting with the AD7804 (quad serial), AD7805 (quad parallel), and AD7809 (octal parallel). All variants share similar electrical characteristics and control logic structures but differ in channel count and data interface type.

Replacement Considerations

Direct functional substitutes include the AD7804 for reduced channel counts or the AD7809 for parallel interface requirements. Cross-vendor replacements require matching 10-bit resolution, serial SPI-like timing, and compatible SOIC-24 packaging. Verify pinout compatibility and register mapping before substitution.