Milpitas, CA — A broadband 6 GHz RMS detector, the LT5581 from Linear Technology features a 40dB dynamic range and a low operating supply current of 1.4 mA. The device is well suited for a wide range of power monitor and control applications in portable and battery-powered wireless systems, cellular basestations, picocells and femtocells, fiber optic transmitters and instrumentation.
The LT5581 outputs a DC voltage that is linearly proportional to the log input power, providing an easy-to-use, mV/dB scaling with exceptional linearity of better than ±1 dB across 40 dB range. Its RMS measurement capability provides accurate RF power readings to within ±0.2 dB regardless of waveforms that have high crest-factor modulated content, multi-carrier or multitone. Moreover, the IC offers accuracy of ±1dB over its operating temperature range of -40 to 85 degrees Celsius.
Operating over a wide supply voltage range of 2.7 V to 5.25 V, the LT5581's low power consumption makes it ideal for battery-powered communication and multimedia devices. Yet, it has the accuracy performance to meet the performance required by basestations, picocells and femtocells, cable infrastructure and optical communication systems. Additionally, the IC's wide frequency range extends to applications including WiMAX and wireless systems in the 5 GHz ISM bands. The single-ended RF input does not require an external RF transformer, thus simplifying the application design while reducing costs. Further, a fast response time of 1 µs rise time to a full power swing makes the device suitable for time-division duplexing systems.
The LT5581 also incorporates a shutdown feature. When its Enable input pin is pulled low, the chip draws a typical shutdown current of 0.2 µA, and a maximum of 6 µA. The device is offered in a tiny 8-lead, 3-mm x 2-mm DFN surface mount package.
A datasheet is available.
For further information visit www.linear.com.