ADL5501

www.DataSheet4U.com PRELIMINARY TECHNICAL DATA FEATURES True rms response Excellent temperature stability Up to 30 dB input dynamic range at 4 GHz 50 Ω input impedance 1.25 V rms, +15 dBm, maximum input Single-supply operation: 2.7 V to 5.5 V Low power: 3 mW at 3 V supply RoHS Compliant 50 MHz to 4 GHz TruPwr™ Detector ADL5501 FUNCTIONAL BLOCK DIAGRAM ADL5501 RFIN x2 i INTERNAL FILTER CAPACITOR VPOS FLTR TRANSCONDUCTANCE CELLS x2 i ERROR AMP BUFFER 100 Ω VRMS APPLICATIONS Measurement of CDMA, CDMA2000, W-CDMA, and QPSK/QAM-based OFDM, and other complex modulation waveforms RF transmitter or receiver power measurement BAND-GAP REFERENCE ENBL COMM Figure 1. GENERAL DESCRIPTION The ADL5501 is a mean-responding power detector for use in high frequency receiver and transmitter signal chains from 50 MHz to 4 GHz. It is easy to apply, requiring only a single supply between 2.7 V and 5.5 V and a power supply decoupling capacitor. The input is internally ac-coupled and has a nominal input impedance of 50 Ω. The output is a linear-responding dc voltage with a conversion gain of 6.6 V/V rms at 900 MHz. The ADL5501 is intended for true power measurement of simple and complex waveforms. The device is particularly useful for measuring high crest factor (high peak-to-rms ratio) signals, such as CDMA, CDMA2000, W-CDMA, and QPSK/QAM-based OFDM waveforms. The on-chip modulation filter provides adequate averaging for most waveforms. The on-chip, 100 Ω series resistance at the output...