DESCRIPTION
The LT®5570 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 amplifi er capable of driving a high capacitance load.

FEATURES
■ 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

APPLICATIONS
■ RMS Power Measurement
■ RF Power Control
■ Receive and Transmit Gain Control
■ W-CDMA, CDMA2000, TD-SCDMA, WiMAX
■ RF Instrumentation