LT5534 Datasheet, PDF (1/8 Pages) Linear Technology – 50MHz to 3GHz RF Power Detector with 60dB Dynamic Range

FEATURES
s _{RF Frequency Range: 50MHz to 3GHz}
s _{Linear Dynamic Range: 60dB}
s _{Exceptional Accuracy over Temperature}
and Power Supply
s _{Fast Transient Response:}
38ns Full-Scale Settling Time
s _{Single 2.7V to 5.25V Supply}
s _{Low Supply Current: 7mA}
s _{Shutdown Current: 0.1µA}
s _{Tiny 6-Lead SC70 Package}
U
APPLICATIO S
s _{RF Receive Power Management}
s _{RF Power Control}
s _{CATV Power Detection}
s _{Optical Receiver Gain Control}
LT5534
50MHz to 3GHz
RF Power Detector
with 60dB Dynamic Range
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 tempera-
ture 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.
TYPICAL APPLICATIO
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 = –40C
–3
–50 –40 –30 –20 –10 0
RF INPUT POWER (dBm)
5534 G05
5534f
1