LT5581IDDB#PBF Linear Technology, LT5581IDDB#PBF Datasheet

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LT5581IDDB#PBF

Manufacturer Part Number
LT5581IDDB#PBF
Description
Manufacturer
Linear Technology
Datasheet

Specifications of LT5581IDDB#PBF

Pin Count
8
Screening Level
Industrial
Lead Free Status / Rohs Status
Compliant

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LT
Quantity:
901
APPLICATIONS
TYPICAL APPLICATION
FEATURES
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
RF
IN
Frequency Range: 10MHz to 6GHz
Accurate Power Measurement of High Crest Factor
(Up to 12dB) Waveforms
40dB Log Linear Dynamic Range
Exceptional Accuracy Over Temperature
Fast Response Time: 1μs Rise, 8μs Fall
Low Power: 1.4mA at 3.3V
Log-Linear DC Output vs Input RF Power in dBm
Small 3mm × 2mm 8-Pin DFN Package
Single-Ended RF Input
GSM/EDGE, CMDA, CDMA2000, W-CDMA, LTE,
WiMAX RF Power Control
Pico-Cells, Femto-Cells RF Power Control
Wireless Repeaters
CATV/DVB Transmitters
MIMO Wireless Access Points
Portable RMS Power Measurement Instrumentation
CONTROL
DIGITAL
POWER
POWER
AMP
ADC
0.01μF
C
FILT
10MHz to 6GHz Infrastructure Power
0.1μF
Amplifi er Level Control
V
2.7V
CC
1
2
3
4
DC
V
EN
V
GND
CC
OUT
TO 5.25V
LT5581
GND
9
DC
RF
GND
GND
C
SQ
IN
8
7
6
5
0.01μF
1000pF
C
L
MATCH
MATCH
DIRECTIONAL
COUPLER
68Ω
DESCRIPTION
6GHz RMS Power Detector
with 40dB Dynamic Range
The LT
precision RMS power detector. The RMS detector uses
a proprietary technique to accurately measure the RF
power from –34dBm to +6dBm (at 2.14GHz) of modulated
signals with a crest factor as high as 12dB. It outputs a DC
voltage in linear scale proportional to an RF input signal
power in dBm. The LT5581 is suitable for precision power
measurement and control for a wide variety of RF standards,
including GSM/EDGE, CDMA, CDMA2000, W-CDMA,
TD-SCDMA, UMTS, LTE and WiMAX, etc. The fi nal DC
output is connected in series with an on-chip 300Ω resistor,
which enables further fi ltering of the output modulation
ripple with just a single off-chip capacitor.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 7342431.
50Ω
RF
®
OUT
5581 is a 10MHz to 6GHz, low power monolithic
–1
–2
–3
2
1
0
3
–35
Linearity Error vs RF Input Power,
2140MHz Modulated Waveforms
T
A
–30
= 25°C
CW
WCDMA, UL
WCDMA DL 1C
WCDMA DL 4C
LTE DL 1C
LTE DL 4C
–25
RF INPUT POWER (dBm)
–20
–15
–10
–5
0
LT5581
5581 TA01b
5
10
5581fa
1

Related parts for LT5581IDDB#PBF

LT5581IDDB#PBF Summary of contents

Page 1

... L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 7342431. ...

Page 2

... LT5581. ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LT5581IDDB#PBF LT5581IDDB#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 range, otherwise specifi cations are PARAMETER 2nd Order Harmonic Distortion 3rd Order Harmonic Distortion f = 880MHz RF RF Input Power Range Linear Dynamic Range, CW (Note 3) Linear Dynamic Range, EDGE (Note 3) Output ...

Page 4

LT5581 ELECTRICAL CHARACTERISTICS range, otherwise specifi cations are PARAMETER Output Variation vs Temperature Deviation from CW Response P = –34 to –4dBm 5800MHz RF RF Input Power Range Linear Dynamic Range, CW (Note 3) ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS EN = 3.3V and T = 25°C, unless otherwise noted. (Test circuit shown in Figure 1) A Output Voltage vs Frequency 2 25°C A 1.8 10MHz 1.6 450MHz 880MHz 1.4 2.14GHz 1.2 2.6GHz 3.5GHz 1.0 ...

Page 6

LT5581 TYPICAL PERFORMANCE CHARACTERISTICS Output Voltage and Linearity Error at 2140MHz 2.0 25°C 1.8 85°C – 40°C 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 –40 –30 –25 –20 –15 – –35 – INPUT POWER ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS Output Voltage and Linearity Error at 5800MHz 2.0 25°C 1.8 85°C – 40°C 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 –40 –30 –25 –20 –15 – –35 – INPUT POWER (dBm) ...

Page 8

LT5581 TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs RF Input Power 25° –25 –20 –15 –10 RF INPUT POWER (dBm) Return Loss vs Frequency Reference in Figure 1 Test ...

Page 9

PIN FUNCTIONS V (Pin 1): Power Supply, 2.7V to 5.25V should be bypassed with a 0.1μF ceramic capacitor. EN (Pin 2): Chip Enable. A logic low or no-connect on the enable pin shuts down the part. A logic ...

Page 10

LT5581 TEST CIRCUIT EN C5 OPT V OUT RF 0.018" 4.4 GND 0.062" DC 0.018" GND REF DES VALUE SIZE C6 100pF 0603 AVX 06033A101KAT2A C7 0.1μF 0603 AVX 06033C104KAT2A C3 0.01μF 0603 AVX 06033C103KAT2A C2 1000pF 0603 ...

Page 11

APPLICATIONS INFORMATION OPERATION To achieve an accurate average power measurement of the high crest factor modulated RF signals, the LT5581 combines a proprietary high speed power measurement subsystem with an internal 150kHz low pass averag- ing fi lter and an ...

Page 12

LT5581 APPLICATIONS INFORMATION A shunt 68Ω resistor can be used to provide a broadband impedance match at low frequencies up to 1.3GHz, and from 4.5GHz to 6GHz. As shown in Figure 4, a nominal broadband input match can be achieved ...

Page 13

APPLICATIONS INFORMATION output pin, to form an RC lowpass fi lter. The internal 300Ω resistor in series with the output pin enables fi ltering of the output signal with just the addition shows the effect of the ...

Page 14

LT5581 APPLICATIONS INFORMATION Figure 10 shows that rise time and fall time are strong functions of RF input power. Data is taken without the output fi lter capacitor. For a given RF modulation type—WCDMA, for example— the internal 150kHz fi ...

Page 15

APPLICATIONS INFORMATION The output voltage noise density and integrated noise are shown in Figures 12 and 13, respectively, for various input power levels. Noise is a strong function of input level. There is roughly a 10dB reduction in the output ...

Page 16

LT5581 PACKAGE DESCRIPTION 0.61 ±0.05 (2 SIDES) 0.70 ±0.05 2.55 ±0.05 1.15 ±0.05 PACKAGE OUTLINE 0.25 ± 0.05 0.50 BSC 2.20 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS NOTE: 1. DRAWING CONFORMS TO VERSION (WECD-1) IN JEDEC PACKAGE ...

Page 17

... Updated Note 2 in Electrical Characteristics Section Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 18

... Interface, 4-Ch W-CDMA ACPR = –67.7dBc at 2.14GHz 50Ω, Single-Ended RF and LO Inputs. 28dBm IIP3 at 900MHz, 13.2dBm P1dB, 0.04dB I/Q Gain Mismatch, 0.4° I/Q Phase Mismatch www.linear.com ● = 28mA CC = 28mA 78mA, CC Baseband DC = 82mA at 3.3V CC Baseband DC Baseband DC 5581fa LT 0410 REV A • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2008 ...

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