LT5534

1

5534fc

TYPICAL APPLICATION

DESCRIPTION

50MHz to 3GHz

RF Power Detector

with 60dB Dynamic Range

detector capable of measuring RF signals over a 60dB

dynamic range. The RF signal in a decibel scale is pre-

cisely converted into DC voltage on a linear scale. The

60dB input dynamic range is achieved using cascaded RF

detectors and RF limiters. Their outputs are summed to

generate an accurate log-linear DC voltage proportional

to the input RF signal in dB. The output is buffered with a

lowoutputimpedancedriver.TheLT5534deliverssuperior

temperature stability (typical output variation within ±1dB

over the full temperature range). The output responds in

less than 40ns to a large RF input signal.

FEATURES

APPLICATIONS

n

RF Frequency Range: 50MHz to 3GHz

n

Linear Dynamic Range: 60dB

n

Exceptional Accuracy over Temperature

and Power Supply

n

Fast Transient Response:

38ns Full-Scale Settling Time

n

Single 2.7V to 5.25V Supply

n

Low Supply Current: 7mA

n

Shutdown Current: 0.1µA

n

Tiny 6-Lead SC70 Package

n

RF RSSI and ACC

n

RF Power Control

n

CATV Power Detection

n

Optical Receiver Gain Control

50MHz to 3GHz RF Power Detector

Output Voltage

vs RF Input Power

DET

DET

DET

DET

DET

RF

1nF

EN

47

ENABLE

RF

INPUT

GND

100pF

3V

LT5534

0.1µF

5534 TA01

RF INPUT POWER (dBm)

–60

0

0.4

0.8

1.2

1.6

2.4

–50

–40

–30

–20

5534 TA01b

–10

0

2.0

–3

–2

–1

0

1

3

2

AT 900MHz

L

, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.