LTC5530 데이터 시트보기 (PDF) - Linear Technology

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LTC5530

Precision 300MHz to 7GHz RF Detector with Shutdown and Gain Adjustment

Linear Technology 

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

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

200Ω 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.

LTC5530ES6

0.1µF

Li-Ion

Tx PA

MODULE

R1

200Ω

1%

C1

0.5pF

±0.05pF

1

6

RFIN VCC

CELL BAND

DIPLEXER

2

5

GND VOUT

3

4

R2

DISABLE ENABLE

SHDN VM

PCS BAND

R3

MOBILE

PHONE

VPC

DSP

BSE

5530 F01

Figure 1. Mobile Phone Tx Power Control Application with a Capacitive Tap

5530f

10

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