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LT5538

Description
40MHz to 3.8GHz RF Power Detector with 75dB Dynamic Range
File Size232KB,12 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LT5538 Overview

40MHz to 3.8GHz RF Power Detector with 75dB Dynamic Range

LT5538
40MHz to 3.8GHz
RF Power Detector with
75dB Dynamic Range
FEATURES
DESCRIPTION
The LT
®
5538 is a 40MHz to 3800MHz monolithic logarith-
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.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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
APPLICATIONS
Received Signal Strength Indication (RSSI)
RF Power Measurement and Control
RF/IF Power Detection
Receiver RF/IF Gain Control
Envelope Detection
ASK Receiver
TYPICAL APPLICATION
40MHz - 3.8GHz Logarithmic RF Detector
2.0
EN
RF
INPUT
56
1nF
1nF
LT5538
ENBL
IN
+
IN
GND
9
OUT
CAP
+
Output Voltage and Linearity Error
vs Input Power
V
CC
= 5V AT 880 MHz
3
2
LINEARITY ERROR (dB)
1
0
–1
T
A
= –40°C
T
A
= 25°C
T
A
= 85°C
–5
5
5538 TA02
V
OUT
1.7
1.4
V
OUT
(V)
5V
0.1μF
1.1
0.8
0.5
CAP
V
CC
5538 TA01
100pF
–2
–3
0.2
–75 –65 –55 –45 –35 –25 –15
INPUT POWER (dBm)
5538f
1

LT5538 Related Products

LT5538 LT5538IDD-PBF LT5538IDD-TRPBF
Description 40MHz to 3.8GHz RF Power Detector with 75dB Dynamic Range 40MHz to 3.8GHz RF Power Detector with 75dB Dynamic Range 40MHz to 3.8GHz RF Power Detector with 75dB Dynamic Range

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