LINEAR TECHNOLOGY LT5534 Technical data
FEATURES
■
RF Frequency Range: 50MHz to 3GHz
■
Linear Dynamic Range: 60dB
■
Exceptional Accuracy over Temperature
and Power Supply
■
Fast Transient Response:
38ns Full-Scale Settling Time
■
Single 2.7V to 5.25V Supply
■
Low Supply Current: 7mA
■
Shutdown Current: 0.1µA
■
Tiny 6-Lead SC70 Package
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APPLICATIO S
■
RF RSSI and ACC
■
RF Power Control
■
CATV Power Detection
■
Optical Receiver Gain Control
LT5534
50MHz to 3GHz
RF Power Detector
with 60dB Dynamic Range
U
DESCRIPTIO
The LT®5534 is a 50MHz to 3GHz monolithic RF power
detector capable of measuring RF signals over a 60dB
dynamic range. The RF signal in a decibel scale is precisely
converted into DC voltage on a linear scale. The 60dB input
dynamic range is achieved using cascaded RF detectors
and RF limiters. Their outputs are summed to generate an
accurate log-linear DC voltage proportional to the input RF
signal in dB. The output is buffered with a low output
impedance driver. The LT5534 delivers superior temperature stability (typical output variation within ±1dB over the
full temperature range). The output responds in less than
40ns to a large RF input signal.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
50MHz to 3GHz RF Power Detector
0.1µF
LT5534
1nF
INPUT
RF
47Ω
ENABLE
RF
EN
U
100pF
V
GND
Output Voltage
vs RF Input Power
3V
CC
DETDETDETDETDET
V
OUT
5534 TA01
V
OUT
(V)
V
OUT
2.4
2.0
1.6
1.2
0.8
0.4
0
–60
VCC = 3V
AT 900MHz
–40 –30 –20
–50
RF INPUT POWER (dBm)
TA = 25°C
= 85°C
T
A
A = –40C
T
–10 0
5534 G05
3
2
LINEARITY ERROR (dB)
1
0
–1
–2
–3
5534fa
1
LT5534
WW
W
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Power Supply Voltage ............................................ 5.5V
Enable Voltage ....................................................0V, V
RF Voltage (+10dBm Equivalent) ............................. ±1V
Operating Ambient Temperature Range .. –40°C to 85°C
Storage Temperature Range ................. –65°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ELECTRICAL CHARACTERISTICS
noted. Test circuit shown in Figure 1. (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
RF Input
Frequency Range 50 to 3000 MHz
Input Impedance 2kΩ
fRF = 50MHz
RF Input Power Range –58 to +2 dBm
Dynamic Range (Note 3) ±3dB Linearity Error, TA = –40°C to 85°C60dB
Output Slope 44 mV/dB
Output Variation vs Temperature PIN = –48dBm to –14dBm, TA = –40°C to 85°C 0.007 dB/°C
fRF = 900MHz
RF Input Power Range –60 to 0 dBm
Dynamic Range (Note 3) ±3dB Linearity Error, TA = –40°C to 85°C60dB
Output Slope 41 mV/dB
Output Variation vs Temperature PIN = –48dBm to –14dBm, TA = –40°C to 85°C 0.008 dB/°C
fRF = 1900MHz
RF Input Power Range –63 to –2 dBm
Dynamic Range (Note 3) ±3dB Linearity Error, TA = –40°C to 85°C61dB
Output Slope 31 36.6 43 mV/dB
Output Variation vs Temperature PIN = –48dBm to –14dBm, TA = –40°C to 85°C 0.012 dB/°C
Output Intercept 50Ω External Termination, TA = –40°C to 85°C –70 –64 –58 dBm
fRF = 2500MHz
RF Input Power Range –63 to –3 dBm
Dynamic Range (Note 3) ±3dB Linearity Error, TA = –40°C to 85°C60dB
Output Slope 35 mV/dB
Output Variation vs Temperature PIN = –48dBm to –14dBm, TA = –40°C to 85°C 0.025 dB/°C
Output Interface
Output DC Voltage No RF Input Signal 30 142 240 mV
Output Impedance 32 Ω
Output Bandwidth 30 MHz
Full-Scale Setting Time Input from No Signal to –2dBm, to 90% 38 ns
Sinking/Sourcing 10/200 mA/µA
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U
W
PACKAGE/ORDER INFORMATION
TOP VIEW
CC
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
VCC = 3V, EN = 3V, TA = 25°C, source impedance = 50Ω, unless otherwise
EN 1
GND 2
V
3
OUT
SC6 PACKAGE
6-LEAD PLASTIC SC70
T
= 125°C, θJA = 256°C/W
JMAX
6 RF
5 GND
4 V
CC
ORDER PART
NUMBER
LT5534ESC6
SC6 PART
MARKING
LBGD
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5534fa
2
LT5534
ELECTRICAL CHARACTERISTICS
VCC = 3V, EN = 3V, TA = 25°C, unless otherwise noted.
Test circuit shown in Figure 1. (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Up/Down
Turn-On Time 200 ns
Turn-Off Time 800 ns
EN = High (On) 0.9 V
EN = Low (Off) 0.6 V
Power Supply
Supply Voltage 2.7 5.25 V
Supply Current EN = High 5 7 9 mA
Shutdown Current EN = Low 0.1 10 µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Specifications over the –40°C to 85°C temperature range are
assured by design, characterization and correlation with statistical process
Note 3: The linearity error is calculated by the difference between the
incremental slope of the output and the average output slope from
–48dBm to –14dBm. The dynamic range is defined as the range over
which the linearity error is within ±3dB.
control.
UW
TYPICAL PERFOR A CE CHARACTERISTICS
Output Voltage vs Frequency
2.8
VCC = 3V
= 25°C
T
A
2.4
2.0
1.6
(V)
OUT
V
1.2
0.8
0.4
0
–70
–60 –50
Variation vs RF Input Power
V
OUT
3
VCC = 3V AT 50MHz
NORMALIZED AT 25°C
2
1
0
VARIATION (dB)
–1
OUT
V
–2
–3
–60
–50
RF INPUT POWER (dBm)
RF INPUT POWER (dBm)
–30 –10 0
–40 –20
TA = –40°C
TA = 85°C
–40 –30 –20
900MHz
50MHz
1.9GHz
2.5GHz
5534 G01
–10 0
5534 G04
Linearity Error vs Frequency Output Voltage vs RF Input Power
3
2
1
0
–1
LINEARITY ERROR (dB)
–2
–3
–70
50MHz
900MHz
2.5GHz
–60 –50
RF INPUT POWER (dBm)
1.9GHz
–30 –10 0
–40 –20
Output Voltage vs RF Input Power V
(V)
OUT
V
2.4
2.0
1.6
1.2
0.8
0.4
0
–60
VCC = 3V
AT 900MHz
–40 –30 –20
–50
RF INPUT POWER (dBm)
(Test circuit shown in Figure 1)
VCC = 3V
T
A
TA = 25°C
= 85°C
T
A
A
= –40C
T
–10 0
= 25°C
5534 G02
5534 G05
2.4
2.0
1.6
(V)
1.2
OUT
V
0.8
0.4
0
–60
3
2
LINEARITY ERROR (dB)
1
0
–1
–2
–3
VARIATION (dB)
OUT
V
–1
–2
–3
VCC = 3V
AT 50MHz
TA = 25°C
T
T
–40 –30 –20
–50
RF INPUT POWER (dBm)
Variation vs RF Input Power
OUT
3
VCC = 3V AT 900MHz
NORMALIZED AT 25°C
2
1
0
–60
–50
TA = –40°C
TA = 85°C
–40 –30 –20
RF INPUT POWER (dBm)
= 85°C
A
A
= –40C
–10 0
3
2
1
0
–1
–2
–3
5534 G03
–10 0
5534 G06
5534fa
LINEARITY ERROR (dB)
3
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