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CXA1744AR

IF Amplifier for Digital Cordless Telephone

Sony Semiconductor 

CXA1744AR

7) RSSI

RSSI detects the input signal level, and the current is output in this IC. If the voltage output is necessary, I-

V conversion should be made by use of a resistor, etc.

This IC can compensate for the unevenness of the filter connected between the IF amplifier and limiter

amplifier. Pin 29 is used to perform the adjustment so that the line of the RSSI output characteristics is as

straight as possible.

Also, RSSI offset adjustment pin (Pin 22) is provided in this IC. For example, the RSSI offset amount is

adjusted to match the dynamic range used in the next-stage IC.

8) Comparator

This IC has three comparators and they are designed according to the following applications.

COMP1 performs the waveform shaping of the demodulated audio signal and outputs the resulting signal

as a rectangular wave.

COMP2 is used to detect the free channel or the signal strength after the RSSI output voltage is input.

COMP3 is the current output-type comparator. The COMP3 output can be turned ON/OFF by setting Pin

32 High/Low and this comparator can form a part of a sample-and-hold circuit. The rise time of the

demodulated signal during burst operating can be shortened.

9) PSX

This is the power save control pin (Pin 2). The power save function is performed by setting this pin Low;

the functional blocks except OSC are in the power save mode.

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