LT5538

1

5538f

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

40MHz to 3.8GHz

RF Power Detector with

75dB Dynamic Range

mic RF power detector, capable of measuring RF signals

over a wide dynamic range, from –75dBm to 10dBm. The

RF signal in an equivalent decibel-scaled value is precisely

converted into DC voltage on a linear scale. The wide linear

dynamic range is achieved by measuring the RF signal us-

ing cascaded RF limiters and RF detectors. Their outputs

are summed to generate an accurate linear DC voltage

proportional to the input RF signal in dBm. The LT5538

delivers superior temperature stable output (within ±1dB

over full temperature range) from 40MHz to 3.8GHz. The

output is buffered with a low impedance driver.

40MHz - 3.8GHz Logarithmic RF Detector

■

Frequency Range: 40MHz to 3.8GHz

■

75dB Log Linear Dynamic Range

■

Exceptional Accuracy over Temperature

■

Linear DC Output vs. Input Power in dBm

■

–72dBm Detection Sensitivity

■

Single-ended RF Input

■

Low Supply Current: 29mA

■

Supply Voltage: 3V to 5.25V

■

8-lead DFN 3mm × 3mm package

■

Received Signal Strength Indication (RSSI)

■

RF Power Measurement and Control

■

RF/IF Power Detection

■

Receiver RF/IF Gain Control

■

Envelope Detection

■

ASK Receiver

Output Voltage and Linearity Error

vs Input Power

ENBL

EN

5V

100pF

0.1μF

GND

OUT

LT5538

5538 TA01

1nF

1nF

56

RF

INPUT

9

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

All other trademarks are the property of their respective owners.

5538 TA02

INPUT POWER (dBm)

–75 –65 –55 –45 –35 –25 –15

–5

5

0.2

0.5

0.8

1.1

1.4

2.0

1.7

–3

–2

–1

0

1

3

2