AD7111UQ

Overview

The AD7111UQ is a monolithic multiplying digital-to-analog converter (DAC) belonging to the LOGDAC family, manufactured by Analog Devices Inc. It features an 8-bit decode logic that generates a 17-bit word for an internal R-2R ladder, enabling precise signal attenuation. The device operates on a single +5 V supply and provides a dynamic range of 88.5 dB with a resolution of 0.375 dB per step. It accepts parallel digital inputs and outputs an unbuffered current proportional to the analog input signal multiplied by the digital code.

Feature Summary

• Monolithic LC2MOS LOGDAC architecture with 88.5 dB dynamic range
• On-chip 8-bit decode logic generating 17-bit R-2R ladder control
• Single +5 V power supply operation
• Parallel data interface with onboard latches

Applications

• Audio attenuators and digitally controlled gain systems
• Sonar systems requiring precise amplitude control
• Function generators with logarithmic scaling
• Logarithmic D/A conversion applications

Part Context

The AD7111UQ is part of the AD7111 series, which includes variants such as the AD7111KNZ and AD7111ACN. These devices are designed for high-resolution logarithmic attenuation. The 'UQ' suffix typically denotes a specific package and temperature grade variant within the ADI portfolio, distinct from standard DIP or SOIC options like the AD7111ACN.

Replacement Considerations

The AD7111A is noted as pin-compatible with the AD7524. Designers replacing this component should verify if the AD7524 meets the required 17-bit effective resolution and logarithmic attenuation characteristics, as the AD7524 is a linear DAC.