AD7111ACNZ

Overview

The AD7111ACNZ is a monolithic logarithmic multiplying digital-to-analog converter (DAC) from Analog Devices, part of the LOGDAC family. It features a 17-bit R-2R ladder architecture that translates an 8-bit binary input into precise attenuation steps. The device provides a dynamic range of 0 dB to 88.5 dB with a nominal resolution of 0.375 dB. Designed for +5 V operation, it includes on-chip data latches and fast microprocessor interfaces. The AC grade guarantees monotonicity up to 72 dB within an industrial temperature range of -40°C to +85°C.

Feature Summary

• 17-bit internal resolution providing 0.375 dB step size over an 88.5 dB dynamic range
• Industrial temperature range (-40°C to +85°C) with guaranteed monotonicity up to 72 dB
• Pin-compatible with industry standard AD7524 for easy design upgrades
• Fast interface with 25 ns data setup time and 57 ns write pulse width

Applications

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

Procurement Notes

Verify the specific AC grade accuracy requirements against the datasheet specifications for the -40°C to +85°C range. Confirm that the 16-pin Plastic DIP package aligns with the target PCB footprint. Ensure ESD precautions are observed during handling due to the CMOS construction.

Selection Notes

Select the AD7111ACNZ when an 8-bit control interface is required but high-resolution logarithmic attenuation is needed. Compare propagation delay and glitch impulse specifications against other grades if high-speed transient response is critical. Verify output amplifier compatibility to minimize offset errors caused by varying source impedance.

Part Context

This component belongs to the AD7111/AD7111A LOGDAC series, which utilizes LC2MOS technology to combine precision bipolar circuits with low-power CMOS logic. The AC grade specifically denotes the industrial temperature variant with extended monotonicity ranges compared to commercial grades.

Replacement Considerations

The AD7111A is pin-compatible with the AD7524, allowing for direct upgrades in existing designs requiring wider dynamic range.