LTC5532EDC#PBF Linear Technology, LTC5532EDC#PBF Datasheet - Page 13

• Manufacturer Part Number: LTC5532EDC#PBF
• Manufacturer: Linear Technology

Specifications of LTC5532EDC#PBF

• Pin Count: 6
• Screening Level: Industrial
• Lead Free Status / Rohs Status: Compliant

APPLICATIO S I FOR ATIO
Applications
The LTC5532 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, to 12GHz or above, is
achievable with reduced performance. The smaller DFN
package version is recommended for these applications
because of its lower parasitics. Figure 1 plots the output
voltage as a function of RF power of a 12GHz CW input
signal.
3600
3200
2800
2400
2000
1600
1200
Figure 1. Typical Detector Characteristics,
12GHz, Gain = 2, V
800
400
0
–32
T
A
–28 –24 –20 –16 –12
= 25 C
U
RF INPUT POWER (dBm)
Figure 2. Mobile Phone Tx Power Control Application Diagram with a Capacitive Tap
ADJUSTMENT
U
OS
= 0V (DFN Package)
OFFSET
–8 –4
W
0
1
2
3
5532 F01
4
LTC5532ES6
RF
GND
V
OS
IN
8
V
V
OUT
V
CC
U
M
6
5
4
R2
R3
0.1 F
The LTC5532 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
data (or audio) output and DC-coupled RSSI output for
signal strength measurements and AGC.
The LTC5532 can be used for RF power detection and
control. Figure 2 is an example of a transmitter power
controller, using the LTC5532 with a capacitive tap to the
power amplifier. A 0.5pF capacitor (C1) followed by a
200
20dB loss at 900MHz referenced to the LTC5532 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.
The LTC5532 can be configured as a comparator for RF
power detection and RF power alarms. The characteriza-
tion data includes a plot of the LTC5532 output delay in
response to a positive input step of varying RF level.
MOBILE
PHONE
DSP
Li-Ion
resistor (R1) form a coupling circuit with about
CELL BAND
PCS BAND
MODULE
VPC
TX PA
BSE
5532 F02
200
1%
R1
DIPLEXER
0.5pF
0.05pF
C1
LTC5532
13
5532f