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PDF LTC5505-1 Data sheet ( Hoja de datos )
| Número de pieza | LTC5505-1 | |
| Descripción | (LTC5505-1/-2) RF Power Detector | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC5505-1/LTC5505-2
RF Power Detector
with Buffered Output and >40dB
Dynamic Range
FEATURES
s Internal Schottky Diode RF Detector with Two Input
Power Ranges:
LTC5505-1, –28dBm to 18dBm
LTC5505-2, –32dBm to 12dBm
s Wide Input Frequency Range: 300MHz to 3GHz
(LTC5505-1); 300MHz to 3.5GHz (LTC5505-2)
s Temperature Compensated
s Buffered Detector Output
s Wide VCC Range of 2.7V to 6V
s Low Operating Current: 0.5mA
s Low Shutdown Current: <2µA
s Low Profile (1mm) ThinSOTTM Package
U
APPLICATIO S
s Multimode Mobile Phone Products
s PCS Devices
s Wireless Data Modems
s Wireless and Cable Infrastructure
s RF Power Alarm
s Envelope Detector
DESCRIPTIO
The LTC®5505-X is an RF power detector for RF applica-
tions operating in the 300MHz to 3.5GHz range. A tem-
perature compensated Schottky diode peak detector and
buffer amplifier are combined in a small 5-pin ThinSOT
package. The supply voltage range is optimized for opera-
tion from a single lithium-ion cell or 3xNiMH.
The RF input voltage is peak detected using an on-chip
Schottky diode. The detected voltage is buffered and
supplied to the VOUT pin. A power saving shutdown mode
reduces supply current to less than 2µA.
The LTC5505-1 operates with input power levels from
–28dBm to 18dBm. The LTC5505-2 operates with input
power levels from –32dBm to 12dBm.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation
TYPICAL APPLICATIO
Dual Band Mobile Phone Tx Power Control
R1
100Ω
C1
0.3pF
DISABLE ENABLE
RF
1
LTC5505-X
RFIN
VCC
5
2
GND
3
SHDN
VOUT 4
C2
0.1µF
Li-Ion
Tx PA MODULE
CELL BAND
PCS BAND
DIPLEXER
MOBILE PHONE
DSP
VPC
BSE
5505 TA01
5505f
1
1 page  
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
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LTC5505-1.PDF ] | |
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