LT5534_15 Datasheet, PDF (1/10 Pages) Linear Technology – 50MHz to 3GHz RF Power Detector with 60dB Dynamic Range

FEATURES
n _{RF Frequency Range: 50MHz to 3GHz}
n _{Linear Dynamic Range: 60dB}
n _{Exceptional Accuracy over Temperature}
and Power Supply
n _{Fast Transient Response:}
38ns Full-Scale Settling Time
n _{Single 2.7V to 5.25V Supply}
n _{Low Supply Current: 7mA}
n _{Shutdown Current: 0.1µA}
n _{Tiny 6-Lead SC70 Package}
APPLICATIONS
n _{RF RSSI and ACC}
n _{RF Power Control}
n _{CATV Power Detection}
n _{Optical Receiver Gain Control}
LT5534
50MHz to 3GHz
RF Power Detector
with 60dB Dynamic Range
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.
TYPICAL APPLICATION
50MHz to 3GHz RF Power Detector
0.1µF
3V
100pF
LT5534
V_CC
DET
DET
DET
DET
DET
1nF
RF
RF
INPUT
47Ω
ENABLE EN
GND
V_OUT
V_OUT
5534 TA01
Output Voltage
vs RF Input Power
2.4
3
V_CC = 3V
AT 900MHz
2.0
2
1.6
1
1.2
0
0.8
–1
0.4
0
–60
T_A = 25°C –2
T_A = 85°C
TA = –40°C
–3
–50 –40 –30 –20 –10 0
RF INPUT POWER (dBm)
5534 TA01b
5534fc
1