LT5570

NOT RECOMMENDED FOR NEW DESIGNS

Fast Responding, 40MHz to 2.7GHz Mean-Squared Power Detector

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Overview

Frequency Range: 40MHz to 2.7GHz
Accurate RMS Power Measurement of High Crest Factor Modulated Waveforms
Linear DC Output vs Input Power in dBm
Linear Dynamic Range: Up to 60dB
Exceptional Accuracy over Temperature: ±0.3dB
Fast Response Time: 0.5μs Rise Time, 8μs Fall Time
Low Supply Current: 26.5mA
Low Impedance Output Buffer Capable of Driving High Capacitance Load
Small 3mm × 3mm 10-Lead DFN Package

The LT5570 is a 40MHz to 2.7GHz monolithic Logarithmic Mean-Squared RF power detector. It is capable of RMS measurement of an AC signal with wide dynamic range, from –52dBm to 13dBm depending on frequency. The power of the AC signal in an equivalent decibel-scaled value is precisely converted into DC voltage on a linear scale, independent of the crest factor of the waveforms. The LT5570 is suitable for precision RF power measurement and level control for a wide variety of RF standards, including CDMA, W-CDMA, CDMA2000, TD-SCDMA and WiMAX. The DC output is buffered with a low output impedance ampliﬁer capable of driving a high capacitance load.

Applications