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Linear Technology Electronic Components Datasheet

LT5538 Datasheet

40MHz to 3.8GHz RF Power Detector

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LT5538 pdf
FEATURES
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
LT5538www.DataSheet4U.com
40MHz to 3.8GHz
RF Power Detector with
75dB Dynamic Range
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.
TYPICAL APPLICATION
40MHz - 3.8GHz Logarithmic RF Detector
RF
INPUT
EN
1nF
56 1nF
LT5538
ENBL
OUT
IN+ CAP+
INCAP
GND VCC
9 5538 TA01
100pF
VOUT
5V
0.1μF
Output Voltage and Linearity Error
vs Input Power
2.0
VCC = 5V AT 880 MHz
1.7
3
2
1.4 1
1.1 0
0.8 –1
0.5 TA = –40°C
TA = 25°C
TA = 85°C
0.2
–75 –65 –55 –45 –35 –25 –15 –5 5
INPUT POWER (dBm)
–2
–3
5538 TA02
5538f
1


Linear Technology Electronic Components Datasheet

LT5538 Datasheet

40MHz to 3.8GHz RF Power Detector

No Preview Available !

LT5538 pdf
LT5538
www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Power Supply Voltage..............................................5.5V
Enable Voltage .....................................–0.3V, VCC + 0.3V
RF Input Power ....................................................15dBm
Operating Ambient Temperature ............ –40°C to +85°C
Storage Temperature Range................. –65°C to +125°C
Maximum Junction Temperature........................... 150°C
PIN CONFIGURATION
TOP VIEW
ENBL 1
IN+ 2
IN3
GND 4
8 OUT
7 CAP+
6 CAP
5 VCC
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
θJA = 43°C/W
EXPOSED PAD (PIN 9) SHOULD BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LT5538IDD#PBF
LT5538IDD#TRPBF
LCVG
8-Lead (3mm × 3mm) Plastic DFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, VCC = 5V, ENBL = 5V. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
RF Input
Input Frequency Range
40 to 3800
MHz
DC Common Mode Voltage
VCC –0.5
V
Input Resistance
394 Ω
fRF = 40 MHZ
RF Input Power Range
–75 to 10
dBm
Linear Dynamic Range
±1dB Linearity Error (Note 3)
76 dB
Output Slope
19.9 mV/dB
Logarithmic Intercept
(Note 5)
–87.5
dBm
Sensitivity
–72 dBm
Output Variation vs Temperature
Normalized to Output at 25°C
PIN = –50dBm; –40°C < TA < 85°C
PIN = –30dBm; –40°C < TA < 85°C
PIN = –10dBm; –40°C < TA < 85°C
0.1/0.6
–0.1/0.6
–0.2/0.6
dB
dB
dB
5538f
2


Part Number LT5538
Description 40MHz to 3.8GHz RF Power Detector
Maker Linear Technology
Total Page 12 Pages
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