LT5534
50MHz to 3GHz
RF Power Detector
with 60dB Dynamic Range
FEATURES
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DESCRIPTION
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 pre-
cisely 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.
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.
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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
APPLICATIONS
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RF RSSI and ACC
RF Power Control
CATV Power Detection
Optical Receiver Gain Control
TYPICAL APPLICATION
50MHz to 3GHz RF Power Detector
3V
0.1µF
100pF
2.4
2.0
DET
DET
V
OUT
1.6
V
OUT
(V)
V
OUT
1.2
0.8
GND
5534 TA01
Output Voltage
vs RF Input Power
V
CC
= 3V
AT 900MHz
3
2
LINEARITY ERROR (dB)
1
0
–1
T
A
= 25°C
T
A
= 85°C
T
A
= –40°C
–50
–40
–30
–20
–10
RF INPUT POWER (dBm)
0
–2
–3
LT5534
DET
1nF
RF
INPUT
47
RF
DET
DET
V
CC
ENABLE
EN
0.4
0
–60
5534 TA01b
5534fc
1
LT5534
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
EN 1
GND 2
V
OUT
3
6 RF
5 GND
4 V
CC
Power Supply Voltage ..............................................5.5V
Enable Voltage .....................................................0V, V
CC
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
SC6 PACKAGE
6-LEAD PLASTIC SC70
T
JMAX
= 125°C,
θ
JA
= 256°C/W
ORDER INFORMATION
LEAD FREE FINISH
LT5534ESC6#PBF
TAPE AND REEL
LT5534ESC6#TRPBF
PART MARKING*
LBGD
PACKAGE DESCRIPTION
6-Lead Plastic SC70
TEMPERATURE RANGE
–40°C to 85°C
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/
ELECTRICAL CHARACTERISTICS
noted. Test circuit shown in Figure 1. (Note 2)
PARAMETER
RF Input
Frequency Range
Input Impedance
f
RF
= 50MHz
RF Input Power Range
Dynamic Range (Note 3)
Output Slope
Output Variation vs Temperature
f
RF
= 900MHz
RF Input Power Range
Dynamic Range (Note 3)
Output Slope
Output Variation vs Temperature
f
RF
= 1900MHz
RF Input Power Range
Dynamic Range (Note 3)
Output Slope
Output Variation vs Temperature
Output Intercept
f
RF
= 2500MHz
RF Input Power Range
Dynamic Range (Note 3)
CONDITIONS
V
CC
= 3V, EN = 3V, T
A
= 25°C, source impedance = 50Ω, unless otherwise
MIN
TYP
50 to 3000
2
–58 to +2
MAX
UNITS
MHz
kΩ
dBm
dB
mV/dB
dB/°C
dBm
dB
mV/dB
dB/°C
dBm
dB
43
–58
mV/dB
dB/°C
dBm
dBm
dB
5534fc
±3dB Linearity Error, T
A
= –40°C to 85°C
P
IN
= –48dBm to –14dBm, T
A
= –40°C to 85°C
60
44
0.007
–60 to 0
±3dB Linearity Error, T
A
= –40°C to 85°C
P
IN
= –48dBm to –14dBm, T
A
= –40°C to 85°C
60
41
0.008
–63 to –2
±3dB Linearity Error, T
A
= –40°C to 85°C
31
P
IN
= –48dBm to –14dBm, T
A
= –40°C to 85°C
50Ω External Termination, T
A
= –40°C to 85°C
–70
61
36.6
0.012
–64
–63 to –3
±3dB Linearity Error, T
A
= –40°C to 85°C
60
2
LT5534
ELECTRICAL CHARACTERISTICS
noted. Test circuit shown in Figure 1. (Note 2)
PARAMETER
Output Slope
Output Variation vs Temperature
Output Interface
Output DC Voltage
Output Impedance
Output Bandwidth
Full-Scale Setting Time
Sinking/Sourcing
Input from No Signal to –2dBm, to 90%
No RF Input Signal
0
142
32
30
38
10/200
380
mV
Ω
MHz
ns
mA/µA
P
IN
= –48dBm to –14dBm, T
A
= –40°C to 85°C
CONDITIONS
V
CC
= 3V, EN = 3V, T
A
= 25°C, source impedance = 50Ω, unless otherwise
MIN
TYP
35
0.025
MAX
UNITS
mV/dB
dB/°C
V
CC
= 3V, EN = 3V, T
A
= 25°C, unless otherwise noted. Test circuit shown in Figure 1. (Note 2)
PARAMETER
Power Up/Down
Turn-On Time
Turn-Off Time
EN = High (On)
EN = Low (Off)
Power Supply
Supply Voltage
Supply Current
Shutdown Current
EN = High
EN = Low
2.7
5
7
0.1
5.25
9
10
V
mA
µA
0.9
0.6
200
800
ns
ns
V
V
CONDITIONS
MIN
TYP
MAX
UNITS
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
Specifications over the –40°C to 85°C temperature range are assured
by design, characterization and correlation with statistical process control.
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.
TYPICAL PERFORMANCE CHARACTERISTICS
Output Voltage vs Frequency
2.8
2.4
2.0
V
OUT
(V)
1.6
1.2
0.8
0.4
0
–70 –60
V
CC
= 3V
T
A
= 25°C
LINEARITY ERROR (dB)
900MHz
50MHz
1.9GHz
2.5GHz
3
50MHz
2
900MHz
1
0
2.5GHz
–1
–2
–3
–70
1.9GHz
(Test circuit shown in Figure 1)
Output Voltage vs RF Input Power
2.4
2.0
1.6
V
OUT
(V)
1.2
0.8
0.4
0
–60
T
A
= 25°C
T
A
= 85°C
T
A
= –40°C
–50
–40
–30
–20
–10
RF INPUT POWER (dBm)
0
V
CC
= 3V
AT 50MHz
3
2
LINEARITY ERROR (dB)
1
0
–1
–2
–3
Linearity Error vs Frequency
V
CC
= 3V
T
A
= 25°C
0
–50 –40 –30 –20 –10
RF INPUT POWER (dBm)
5534 G01
–60
0
–50 –40 –30 –20 –10
RF INPUT POWER (dBm)
5534 G02
5534 G03
5534fc
3
LT5534
TYPICAL PERFORMANCE CHARACTERISTICS
3
2
V
OUT
VARIATION (dB)
1
0
–1
–2
–3
–60
(Test circuit shown in Figure 1)
V
OUT
Variation vs RF Input Power
V
CC
= 3V AT 50MHz
NORMALIZED AT 25°C
2.4
2.0
1.6
V
OUT
(V)
1.2
0.8
0.4
Output Voltage vs RF Input Power
V
CC
= 3V
AT 900MHz
3
2
LINEARITY ERROR (dB)
1
0
–1
T
A
= –40°C
T
A
= 85°C
–50
–40
–30
–20
–10
RF INPUT POWER (dBm)
0
0
–60
T
A
= 25°C
T
A
= 85°C
T
A
= –40°C
–50
–40
–30
–20
–10
RF INPUT POWER (dBm)
0
–2
–3
5534 G05
5534 G04
3
2
V
OUT
VARIATION (dB)
1
0
–1
–2
V
OUT
Variation vs RF Input Power
V
CC
= 3V AT 900MHz
NORMALIZED AT 25°C
Output Voltage vs RF Input Power
2.4
2.0
1.6
V
OUT
(V)
1.2
0.8
0.4
0
–60
T
A
= 25°C
T
A
= 85°C
T
A
= –40°C
–50
–40
–30
–20
–10
RF INPUT POWER (dBm)
0
V
CC
= 3V
AT 1.9GHz
3
2
LINEARITY ERROR (dB)
1
0
–1
–2
–3
T
A
= –40°C
T
A
= 85°C
–3
–60
–50
–40
–30
–20
–10
RF INPUT POWER (dBm)
0
5534 G07
5534 G06
3
2
V
OUT
VARIATION (dB)
1
0
–1
–2
V
OUT
Variation vs RF Input Power
V
CC
= 3V AT 1.9GHz
NORMALIZED AT 25°C
Output Voltage vs RF Input Power
2.4
2.0
1.6
V
OUT
(V)
1.2
0.8
0.4
0
–60
T
A
= 25°C
T
A
= 85°C
T
A
= –40°C
–50
–40
–30
–20
–10
RF INPUT POWER (dBm)
0
V
CC
= 3V
AT 2.5GHz
3
2
LINEARITY ERROR (dB)
1
0
–1
–2
–3
T
A
= 85°C
T
A
= –40°C
–3
–60
–50
–40
–30
–20
–10
RF INPUT POWER (dBm)
0
5534 G09
5534 G08
5534fc
4
LT5534
TYPICAL PERFORMANCE CHARACTERISTICS
3
2
V
OUT
VARIATION (dB)
1
0
–1
–2
–3
–60
T
A
= 85°C
(Test circuit shown in Figure 1)
Output Voltage Distribution
vs Temperature
PERCENTAGE DISTRIBUTION (%)
35 RF P = –48dBm AT 1.9GHz
IN
V
CC
= 3V
30
25
20
15
10
5
0
0.54 0.56 0.58 0.6 0.62 0.64 0.66 0.68 0.7
V
OUT
(V)
5534 G12
V
OUT
Variation vs RF Input Power
V
CC
= 3V AT 2.5GHz
NORMALIZED AT 25°C
2.8
2.4
2.0
V
OUT
(V)
Output Voltage vs RF Input Power
at V
CC
= 3V and 5V
T
A
= 25°C
50MHz
V
CC
= 3V, 5V
1.9GHz
V
CC
= 3V, 5V
T
A
= 25°C
T
A
= –40°C
T
A
= 85°C
T
A
= –40°C
1.6
1.2
0.8
0.4
0
–60
–50
–40
–30
–20
–10
RF INPUT POWER (dBm)
0
–50
–30
–10
–40
–20
RF INPUT POWER (dBm)
0
5534 G11
5534 G10
Output Voltage Distribution
vs Temperature
40
PERCENTAGE DISTRIBUTION (%)
35
30
25
20
15
10
5
0
1.79 1.81 1.83 1.85 1.87 1.89 1.91 1.93
V
OUT
(V)
5534 G13
Supply Voltage vs Supply Current
10
9
SUPPLY CURRENT (mA)
T
A
= 85°C
8
T
A
= 25°C
7
6
5
4
T
A
= –40°C
RF P
IN
= –14dBm AT 1.9GHz
V
CC
= 3V
T
A
= 25°C
T
A
= –40°C
T
A
= 85°C
2.5
3
3.5
4
4.5
SUPPLY VOLTAGE (V)
5
5.5
5530 G14
RF Input Return Loss vs Frequency
0
–5
1V/DIV
RETURN LOSS (dB)
–10
–15
–20
–25
–30
Output Transient Response
V
OUT
RF
INPUT
PULSED RF
0dBm AT 100MHz
0
1
1.5
2
2.5
0.5
RF INPUT FREQUENCY (GHz)
3
5534 G15
50ns/DIV
5534 G16
5534fc
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