AD7118KP

Overview

The AD7118KP is a CMOS logarithmic digital-to-analog converter (DAC) belonging to the LOGDAC family. It attenuates an analog input signal over a dynamic range of 85.5 dB in 1.5 dB steps, determined by a six-bit digital code. The device supports a full ±25 V input range and operates from a single 5 V to 15 V supply. Designed for military specifications, it functions within a temperature range of –55°C to +125°C. Key electrical characteristics include low distortion, latch-proof operation without requiring external Schottky diodes, and an operating frequency range extending from DC to several hundred kHz.

Feature Summary

• 85.5 dB dynamic range with 1.5 dB resolution
• Full ±25 V analog input voltage range
• Military temperature rating: –55°C to +125°C
• Latch-proof operation

Applications

• Digitally controlled automatic gain control (AGC) systems
• Audio attenuators
• Wide dynamic range A/D converters
• Sonar systems
• Function generators

Part Context

The AD7118KP is part of the Analog Devices LOGDAC series, which provides digitally controlled attenuation. While many LOGDAC variants are discontinued or limited to commercial/industrial grades, the KP suffix denotes a military-grade package and extended temperature capability. This distinguishes it from standard commercial versions like the AD7118AR or AD7118AK.

Replacement Considerations

Verify if the specific military grade and temperature range are required. Commercial equivalents such as the AD7118AR or AD7118AK offer similar functionality but lack the –55°C to +125°C rating and military packaging. Ensure the application can tolerate the lower temperature limits if substituting with non-military parts.