Pin
Signal name
Direction
Description
5
HS_EAR_L
Output
Audio out
6
PLUG_DET
Input
Plug detection
RF description
Receiver (RX)
An analogue signal is received by the phone's antenna. The signal is converted to a digital signal and is then
transferred further to the baseband (eg. to the earpiece).
The receiver functions are implemented in the RF ASIC.
Signals with different frequencies take different paths, therefore being handled by different components.
Transmitter (TX)
The digital baseband signal (eg. from the microphone) is converted to an analogue signal, which is then
amplified and transmitted from the antenna. The frequency of this signal can be tuned to match the
bandwidth of the system in use (eg. GSM900).
The transmitter functions are implemented in the RF ASIC.
RM-495; RM-496
System Module
Page 5 –14
COMPANY CONFIDENTIAL
Issue 1
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