LTC5505 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC5505' PDF : 8 Pages View PDF
LTC5505-1/LTC5505-2
PI FU CTIO S
RFIN (Pin 1): RF Feedback Voltage from the Directional
Coupler. Referenced to VCC. A coupling capacitor of 33pF
must be used to connect to the ground referenced direc-
tional coupler. The frequency range is 300MHz to 3GHz.
This pin has an internal 250Ω termination, an internal
Schottky diode detector and peak detector capacitor. (See
Note 6 in the Electrical Characteristics.)
GND (Pin 2): System Ground.
SHDN (Pin 3): Shutdown Input. A logic low on the SHDN
pin places the part in shutdown mode. A logic high enables
the part. SHDN has an internal 150k pull down resistor to
ensure that the part is in shutdown when the drivers are in
a tri-state condition.
VOUT (Pin 4): Buffered and Level Shifted Detector Output
Voltage.
VCC (Pin 5): Power Supply Voltage, 2.7V to 6V. VCC should
be bypassed with 0.1µF and 100pF ceramic capacitors.
BLOCK DIAGRA
(0Ω TO 20Ω FOR LTC5505-1,
0Ω FOR LTC5505-2)
RFSOURCE
33pF
VCC
5
1
RFIN
250Ω
GAIN
COMPRESSION
SHDN
GND 2
28pF
60µA
60µA
+
RF DET
–
150k
3
SHDN
130mV
22k
+
BUFFER
–
30k
30k
100Ω
100Ω
BIAS
4 VOUT
5505 BD
5
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