AD7111ABNZ

Overview

The AD7111ABNZ is a monolithic multiplying D/A converter from the LOGDAC family, featuring a 17-bit R-2R architecture. It attenuates analog input signals over an 88.5 dB dynamic range in 0.375 dB steps using an onboard 8-bit decode logic. The device operates on a single +5 V supply and provides unbuffered current output. It utilizes a parallel interface with edge-triggered write control for data loading into internal latches.

Feature Summary

• 17-bit resolution providing 0.375 dB step size across 88.5 dB dynamic range
• On-chip decode logic translates 8-bit inputs to 17-bit DAC codes
• +5 V single supply operation with low power consumption
• Transparent latch operation capability via level-triggered WR input

Applications

• Audio Attenuators
• Sonar Systems
• Function Generators
• Digitally Controlled AGC Systems

Procurement Notes

Verify component authenticity through authorized Analog Devices channels or certified distributors. Confirm package integrity and pin alignment against the 16-pin DIP specification before integration. Ensure handling procedures account for ESD sensitivity during storage and assembly.

Selection Notes

Select this model for applications requiring fine logarithmic attenuation steps within a -40°C to +85°C temperature range. Ensure the design accommodates unbuffered current output by integrating a suitable transimpedance amplifier. Verify that the microprocessor interface supports the required setup and hold times for reliable data transfer.

Part Context

This component belongs to the AD7111/AD7111A LOGDAC series, which combines precision bipolar circuits with CMOS logic. The AB grade specifies industrial temperature performance. It serves as a high-resolution alternative to standard 8-bit multiplying DACs, offering superior dynamic range in a compact form factor.

Replacement Considerations

The AD7111A is pin-compatible with the industry-standard AD7524. Designs originally utilizing the AD7524 can be upgraded to the AD7111ABNZ to benefit from wider dynamic range and finer step resolution without modifying the physical footprint.