LTC5530 Linear Technology, LTC5530 Datasheet - Page 10

• Manufacturer Part Number: LTC5530
• Description: Precision 300MHz to 7GHz RF Detector
• Manufacturer: Linear Technology

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LTC5530
APPLICATIO S I FOR ATIO
Applications
The LTC5530 can be used as a self-standing signal strength
measuring receiver for a wide range of input signals from
–32dBm to 10dBm for frequencies from 300MHz to 7GHz.
Operation at higher frequencies is achievable. Consult
factory for more information.
The LTC5530 can be used as a demodulator for AM and
ASK modulated signals with data rates up to 2MHz.
Depending on specific application needs, the RSSI output
can be split between two branches, providing AC-coupled
10
U
DISABLE
U
Figure 1. Mobile Phone Tx Power Control Application with a Capacitive Tap
ENABLE
1
2
3
W
LTC5530ES6
RF
GND
SHDN
IN
V
V
OUT
V
CC
M
6
5
4
U
R2
R3
0.1 F
data (or audio) output and DC-coupled RSSI output for
signal strength measurements and AGC.
The LTC5530 can be used for RF power detection and
control. Figure 1 is an example of transmitter power
control, using the LTC5530 with a capacitive tap to the
power amplifier. A 0.5pF capacitor (C1) followed by a
200 resistor (R1) forms a coupling circuit with about
20dB loss at 900MHz referenced to the LTC5530 RF input
pin. In the actual product implementation, component
values for the capacitive tap may be different depending on
parts placement, PCB parasitics and parameters of the
antenna.
MOBILE
PHONE
DSP
Li-Ion
CELL BAND
PCS BAND
MODULE
VPC
Tx PA
BSE
200
1%
R1
DIPLEXER
0.5pF
0.05pF
C1
5530 F01
5530f