5533 查看數據表（PDF） - Linear Technology
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5533 Datasheet PDF : 12 Pages
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LTC5533
APPLICATIO S I FOR ATIO
Operation
The LTC5533 contains two RF detector dice in one pack-
age forming two independent RF detector channels. Each
channel provides RF power detection over frequencies
ranging from 300MHz to 11GHz. Channel functions include
an internal frequency compensated buffer amplifier with the
gain set to 2x, an RF Schottky diode peak detector and level
shift amplifier to convert the RF input signal to low frequency
and a delay circuit to avoid voltage transients at VOUT when
powering up. The LTC5533 has both shutdown and start-
ing voltage adjustment capabilities.
Buffer Amplifiers
The output buffer amplifiers are capable of supplying
typically 4mA into a load. These amplifiers have band-
widths of 2MHz and a fixed internal gain of two.
The VOS inputs control the DC input voltages to the buffer
amplifiers. VOS must be connected to ground if the DC
output voltage is not to be changed. The buffers are initially
trimmed to approximately 130mV with VOS connected to
ground.
The VOS pins are used to change the initial VOUT starting
voltage. This function enables the LTC5533 outputs to
span the input range of a variety of analog-to-digital
converters. VOUT will not change until VOS exceeds 130mV.
The voltage at VOUT for VOS >130mV and with no RF signal
present is:
VOUT = VOS
VOUT will track VOS above 130mV.
RF Detectors
The internal RF Schottky diode peak detectors and level
shift amplifiers convert the RF input signals to a low
frequency signal. The detectors demonstrate excellent
efficiency and linearity over a wide range of input power.
The Schottky diodes are biased at about 55µA and drive
25pF internal peak detector capacitors.
Applications
The LTC5533 can be used as a self-standing signal
strength measuring receiver for a wide range of input
signals from –32dBm to 12dBm for frequencies from
300MHz to 11GHz. Operation at higher frequencies is
achievable with reduced performance. Consult factory for
more information. Figure 1 plots the output voltage as a
function of RF input power of an 11GHz CW input signal.
VCC1
2.7V TO 6V
VOUT1
VOS1
VCC2
2.7V TO 6V
VOUT2
VOS2
Demo Board Schematic
C1
0.1µF
C2
100pF
C4
OPT
C5
OPT
C7
0.1µF
C8
100pF
C9
OPT
C10
OPT
LTC5533
1
VCC1
2
VOUT1
12
RFIN1
11
GND
3
VOS1
4
VCC2
5
VOUT2
10
SHDN1
9
RFIN2
8
GND
6
7
VOS2 SHDN2
13
SHDN1
C3
39pF
C6
39pF
SHDN2
R1
OPT
R2
OPT
5533 BD
J1
RFIN1
J2
RFIN2
5533f
9
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