LTC5509

1

5509f

s

Multimode Mobile Phone Products

s

Optical Data Links

s

Wireless Data Modems

s

Wireless and Cable Infrastructure

s

RF Power Alarm

s

Envelope Detector

s

Temperature Compensated Internal Schottky Diode

RF Detector

s

Wide Input Frequency Range: 300MHz to 3GHz

s

Wide Input Power Range: –30dBm to 6dBm

s

Buffered Detector Output

s

s

Low Operating Current: 600

µA

s

Low Shutdown Current: <2

µA

s

SC70 Package

300MHz to 3GHz

RF Power Detector

in SC70 Package

The LTC

operating in the 300MHz to 3GHz range. A temperature

compensated Schottky diode peak detector and buffer

amplifier are combined in a small SC70 package. The

supply voltage range is optimized for operation from a

single lithium-ion cell or 3xNiMH.

The RF input voltage is peak detected using an on-chip

Schottky diode. The detected voltage is buffered and

sequently, the output voltage is linearly proportional to the

RF input voltage. A power saving shutdown mode reduces

supply current to less than 2

µA.

The LTC5509 operates with input power levels from

–30dBm to 6dBm.

300MHz to 3GHz RF Power Detector

Output Voltage vs RF Input Power

, LTC and LT are registered trademarks of Linear Technology Corporation.

LTC5509

6

2

1

4

5

3

100pF

0.1

µF

GND

SHDN

DISABLE ENABLE

33pF

5509 TA01

RF

INPUT

GND

RF INPUT POWER (dBm)

–30

0

500

1000

1500

2000

–20

–10

0

10

5509 TA02

2500

3000

–25

–15

–5

5

850MHz

1.85GHz

3GHz

DESCRIPTIO

FEATURES

APPLICATIO S

TYPICAL APPLICATIO