LT5534
50MHz to 3GHz
RF Power Detector
with 60dB Dynamic Range
FEATURES
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DESCRIPTIO
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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: 0.1碌A(chǔ)
Tiny 6-Lead SC70 Package
APPLICATIO S
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The LT
廬
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 tempera-
ture stability (typical output variation within
鹵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.
RF Receive Power Management
RF Power Control
CATV Power Detection
Optical Receiver Gain Control
TYPICAL APPLICATIO
50MHz to 3GHz RF Power Detector
3V
0.1碌F
100pF
2.0
2.4
LT5534
DET
1nF
RF
INPUT
47鈩?/div>
ENABLE
RF
DET
DET
V
CC
1.6
1
0
鈥?
T
A
= 25擄C
T
A
= 85擄C
T
A
= 鈥?0C
鈥?0
鈥?0
鈥?0
鈥?0
鈥?0
RF INPUT POWER (dBm)
0
鈥?
鈥?
V
OUT
V
OUT
(V)
DET
DET
V
OUT
EN
GND
5534 TA01
U
Output Voltage
vs RF Input Power
V
CC
= 3V
AT 900MHz
3
2
LINEARITY ERROR (dB)
1.2
0.8
0.4
0
鈥?0
5534 G05
U
U
5534f
1
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