LTC5531ES6 데이터 시트보기 (PDF) - Linear Technology

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LTC5531ES6

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

Linear Technology 

LTC5531

APPLICATIO S I FOR ATIO

Applications

The LTC5531 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 LTC5531 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 LTC5531 can be used for RF power detection and

control. Figure 1 is an example of transmitter power

control, using the LTC5531 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 LTC5531 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.

DISABLE ENABLE

LTC5531ES6

1

6

RFIN VCC

2

5

GND VOUT

3

4

SHDN VOS

0.1µF

OFFSET

ADJUSTMENT

Li-Ion

Tx PA

MODULE

R1

200Ω

1%

C1

0.5pF

±0.05pF

CELL BAND

DIPLEXER

PCS BAND

MOBILE

PHONE

DSP

VPC

BSE

5532 F01

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

5531f

10

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