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LT5581 - 6GHz RMS Power Detector with 40dB Dynamic Range

The LT5581 is a 10MHz to 6GHz, low power monolithic precision RMS power detector. The RMS detector uses a proprietary technique to accurately measure the RF power from –34dBm to +6dBm (at 2.14GHz) of modulated signals with a crest factor as high as 12dB. It outputs a DC voltage in linear scale proportional to an RF input signal power in dBm. The LT5581 is suitable for precision power measurement and control for a wide variety of RF standards, including GSM/EDGE, CDMA, CDMA2000, W-CDMA, TD-SCDMA, UMTS, LTE and WiMAX, etc. The final DC output is connected in series with an on-chip 300Ω resistor, which enables further filtering of the output modulation ripple with just a single off-chip capacitor.

Features Frequency Range: 10MHz to 6GHz Accurate Power Measurement of High Crest Factor (Up to 12dB) Waveforms 40dB Log Linear Dynamic Range Exceptional Accuracy Over Temperature Fast Response Time: 1μs Rise, 8μs Fall Low Power: 1.4mA at 3.3V Log-Linear DC Output vs Input RF Power in dBm Small 3mm × 2mm 8-Pin DFN Package Single-Ended RF Input Typical Application

Applications GSM/EDGE, CMDA, CDMA2000, W-CDMA, LTE, WiMAX RF Power Control Pico-Cells, Femto-Cells RF Power Control Wireless Repeaters CATV/DVB Transmitters MIMO Wireless Access Points Portable RMS Power Measurement Instrumentation Packaging

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