Datasheet LT5570 (Analog Devices)

LT5570 Fast Responding, 40MHz to 2.7GHz Mean-Squared Power Detector
FEATURES DESCRIPTION
n
Frequency Range: 40MHz to 2.7GHz
The LT®5570 is a 40MHz to 2.7GHz monolithic Logarithmic n
Accurate RMS Power Measurement of High Crest
Mean-Squared RF power detector. It is capable of RMS
Factor Modulated Waveforms
measurement of an AC signal with wide dynamic range, n
Linear DC Output vs Input Power in dBm
from –52dBm to 13dBm depending on frequency. The n
Linear Dynamic Range: Up to 60dB
power of the AC signal in an equivalent decibel-scaled n
Exceptional Accuracy over Temperature: ±0.3dB
value is precisely converted into DC voltage on a linear n
Fast Response Time: 0.5μs Rise Time,
scale, independent of the crest factor of the waveforms. The
8μs Fall Time
LT5570 is suitable for precision RF power measurement and n Low Supply Current: 26.5mA level control for a wide variety of RF standards, including n Low Impedance Output Buffer Capable of Driving CDMA, W-CDMA, CDMA2000, TD-SCDMA and WiMAX. High Capacitance Load The DC output is buffered with a low output impedance n Small 3mm × 3mm 10-Lead DFN Package amplifi er capable of driving a high capacitance load.
APPLICATIONS
, 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. n RMS Power Measurement n RF Power Control n Receive and Transmit Gain Control n W-CDMA, CDMA2000, TD-SCDMA, WiMAX n RF Instrumentation
TYPICAL APPLICATION 40MHz to 2.7GHz Mean-Squared Power Detector Output Voltage, Linearity Error vs Input Power, 25°C (2140 MHz)
2.4 3 5V 1MF 1nF 22nF 2.0 2 LINEARITY ERROR (dB) 1 10 RF VCC FLTR 1.6 1 INPUT 1:4 2 9 IN+ EN ENABLE (V) 1.2 0 3 8 OUT NC DEC LT5570 DNC V 4 7 IN– DNC 0.8 –1 5 6 GND OUT VOUT 0.4 CW –2 4CH WCDMA 5570 TA01a 3CH CDMA2000 0 –3 –45 –35 –25 –15 –5 5 15 RF INPUT POWER (dBm) 5570 TA01b 5570f 1