LT5570 Datasheet | Linear Technology

.. Features n n n n n n n n n LT5570 Fast Responding, 40MHz to 2.7GHz Mean-Squared Power Detector 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 - 52d Bm to 13d Bm 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 Wi MAX. The DC output is buffered with a low output impedance amplifier capable of driving a high capacitance load. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 7262661, 7259620, 7268608. Frequency Range: 40MHz to 2.7GHz Accurate RMS Power Measurement of High Crest Factor Modulated Waveforms Linear DC Output vs Input Power in d Bm Linear Dynamic Range: Up to 60d B Exceptional Accuracy over Temperature: ±0.3d B Fast Response Time: 0.5μs Rise Time, 8μs Fall Time Low Supply Current: 26.5m A Low Impedance Output Buffer Capable of Driving High Capacitance Load Small 3mm × 3mm 10-Lead DFN Package APPLICATIONS n n n n n RMS Power Measurement RF Power Control Receive and Transmit Gain Control W-CDMA, CDMA2000, TD-SCDMA, Wi MAX RF Instrumentation TYPICAL APPLICATION 40MHz to 2.7GHz Mean-Squared Power Detector 5V 1MF RF INPUT 1:4 NC 1n F 1 2 3 4 5 10 9 8 7 6 VOUT ENABLE VOUT (V) 22n F Output Voltage, Linearity Error vs Input Power, 25°C (2140 MHz) 2.4 2.0 1.6 1.2 0.8 0.4 0 - 45 CW 4CH WCDMA 3CH CDMA2000 - 35 - 15 5 - 25 - 5 RF INPUT POWER (d Bm) 15 3 2 LINEARITY ERROR (d B) 1 0 - 1 - 2 - 3 VCC IN+ DEC IN- GND LT5570 FLTR EN DNC DNC OUT 5570 TA01a 5570 TA01b 5570f .. (No...