LINEAR TECHNOLOGY - 1 LT5534 Data Sheet

LINEARITY ERROR (d B)

LT5534

50MHz to 3GHz RF Power Detector

with 60d B Dynamic Range

FEATURES DESCRIPTIO RF Frequency Range: 50MHz to 3GHz The LT®5534 is a 50MHz to 3GHz monolithic RF power Linear Dynamic Range: 60d B detector capable of measuring RF signals over a 60d B Exceptional Accuracy over Temperature dynamic range. The RF signal in a decibel scale is precisely and Power Supply converted into DC voltage on a linear scale. The 60d B input Fast Transient Response: dynamic range is achieved using cascaded RF detectors 38ns Full-Scale Settling Time and RF limiters. Their outputs are summed to generate an Single 2.7V to 5.25V Supply accurate log-linear DC voltage proportional to the input RF Low Supply Current: 7m A signal in d B. The output is buffered with a low output Shutdown Current: 0.1µA impedance driver. The LT5534 delivers superior tempera- Tiny 6-Lead SC70 Package ture stability (typical output variation within ±1d B over the

full temperature range). The output responds in less than 40ns to a large RF input signal.

APPLICATIO S

, LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

RF RSSI and ACC RF Power Control CATV Power Detection

UT (V

Optical Receiver Gain Control

TYPICAL APPLICATIO

50MHz to 3GHz RF Power Detector Output Voltage vs RF Input Power

VCC = 3V

AT 900MHz

LT5534 VCC

DETDETDETDETDET VOUT

1n F 1.2 RF RF

INPUT

ENABLE EN

GND 0.4 TA = 25°C –2

5534 TA01 TA = 85°C TA = –40C

–60 –50 –40 –30 –20 –10 RF INPUT POWER (d Bm)

5534fa