TRF2443IPFPR datasheet(60/72 Pages) TI

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POWER ALARM DETECTOR

TX I / Q Modulator

BBI

BBQ

TX Attn

+ Amp

TX OUT

Peak

Detector

Programmable

Threshold

Power

Alarm

Logic

TX Power Alarm

Software

Reset

VCC

Pout

–X dB

norm

Poutnorm

TX Mixer

Output

TRF2443

SLWS217A – SEPTEMBER 2009 – REVISED SEPTEMBER 2009 ................................................................................................................................... www.ti.com

The TRF2443 integrates power-alarm indicator circuitry that allows monitoring of the TX output power and

issuing an alarm (PWRDET pin LOW) if the output power goes below a threshold level.

The power-alarm indicator includes a peak detector, a comparator with a programmable threshold level, and

power-alarm logic (see Figure 105).

Figure 105. Block Diagram of the TX Power-Alarm Implementation

The peak detector measures the signal power level at the modulator output and provides a dc level proportional

to the measured level. The peak-detector output is compared to a programmable reference threshold and the

comparator output (V1) goes HIGH if the measured level is below the threshold level (see Figure 106).

Figure 106. Expected Output of the Comparator

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TRF2443IPFPR Datasheet(PDF) 60 Page - Texas Instruments

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