LT5538IDD-PBF LINER [Linear Technology], LT5538IDD-PBF Datasheet

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LT5538IDD-PBF

Manufacturer Part Number
LT5538IDD-PBF
Description
40MHz to 3.8GHz RF Power Detector with 75dB Dynamic Range
Manufacturer
LINER [Linear Technology]
Datasheet
FEATURES
APPLICATIONS
TYPICAL APPLICATION
INPUT
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
RF
56
40MHz - 3.8GHz Logarithmic RF Detector
1nF
1nF
EN
ENBL
IN
IN
GND
+
LT5538
9
CAP
CAP
5538 TA01
OUT
V
CC
+
100pF
V
OUT
0.1μF
DESCRIPTION
The LT
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.
All other trademarks are the property of their respective owners.
5V
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
®
RF Power Detector with
5538 is a 40MHz to 3800MHz monolithic logarith-
75dB Dynamic Range
2.0
1.7
0.5
0.2
1.4
1.1
0.8
–75 –65 –55 –45 –35 –25 –15 –5
Output Voltage and Linearity Error
40MHz to 3.8GHz
V
CC
= 5V AT 880 MHz
vs Input Power
INPUT POWER (dBm)
T
T
T
A
A
A
= –40°C
= 25°C
= 85°C
LT5538
5538 TA02
5
3
2
1
0
–1
–2
–3
1
5538f

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LT5538IDD-PBF Summary of contents

Page 1

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 ■ ...

Page 2

... ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LT5538IDD#PBF LT5538IDD#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: For more information on tape and reel specifi ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER 2nd Order Harmonic Distortion 3rd Order Harmonic Distortion f = 450 MHz RF RF Input Power Range Linear Dynamic Range Output Slope Logarithmic Intercept Sensitivity Output Variation vs ...

Page 4

LT5538 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER Sensitivity Output Variation vs Temperature f = 3600 MHz RF RF Input Power Range Linear Dynamic Range Output Slope Logarithmic Intercept Sensitivity Output Variation vs Temperature Output ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Supply Voltage –40° 25° 85° 2.5 3 3.5 4 4.5 5 5.5 SUPPLY VOLTAGE V (V) CC 5538 ...

Page 6

LT5538 TYPICAL PERFORMANCE CHARACTERISTICS Output Voltage, Linearity Error vs Input Power at 2.7GHz 1 1.5 2 1.2 1 0.9 0 0.6 – –40°C 0.3 – 25° 85°C ...

Page 7

PIN FUNCTIONS ENBL (Pin 1): Enable Pin. An applied voltage above 1V will activate the bias for the IC. For an applied voltage below 0.3V, the circuits will be shut down (disabled) with a cor- responding reduction in power supply ...

Page 8

LT5538 APPLICATIONS INFORMATION The LT5538 is a 40MHz to 3.8 GHz logarithmic RF power detector. It consists of cascaded limiting amplifi ers and RF detectors. The output currents from every RF detector are combined and low-pass fi ltered before applied ...

Page 9

APPLICATIONS INFORMATION OUTPUT INTERFACE The output interface of the LT5538 is shown in Figure 3. This output buffer circuit can source 10mA current to the load and sink 200 μA current from the load. The small- signal output bandwidth is ...

Page 10

LT5538 APPLICATIONS INFORMATION ENBL (ENABLE) PIN OPERATION A simplifi ed circuit schematic of the ENBL Pin is shown in Figure 5. The enable voltage necessary to turn on the LT5538 is 1V. The current drawn by the ENBL pin varies ...

Page 11

TEST CIRCUIT PACKAGE DESCRIPTION 3.5 ±0.05 1.65 ±0.05 2.15 ±0.05 (2 SIDES) 0.25 ± 0.05 0.50 BSC 2.38 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS Information furnished by Linear Technology Corporation is believed to be accurate and reliable. ...

Page 12

LT5538 RELATED PARTS PART NUMBER DESCRIPTION Infrastructure LT5514 Ultralow Distortion, IF Amplifi er/ADC Driver with Digitally Controlled Gain LT5515 1.5GHz to 2.5GHz Direct Conversion Quadrature Demodulator 20dBm IIP3, Integrated LO Quadrature Generator LT5516 0.8GHz to 1.5GHz Direct Conversion Quadrature Demodulator ...

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