LTC5505-1/LTC5505-2
PI FU CTIO S
RFIN (Pin 1): RF Input Voltage. Referenced to VCC. An
external coupling capacitor to the RF source is required.
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 appropriately with ceramic capacitors.
BLOCK DIAGRA
RFIN 1
250Ω
VCC
5
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
5505f
5