LGC-340/345W
26
LGIC
LG Information & Communications, Ltd.
2. Digital/Voice Processing Part
2.1 Overview
The digital/voice processing part processes the user's commands and processes all the digital and voice signal
processing in order to operate in the phone. The digital/voice processing part is made up of a keypad/LCD,
receptacle part, voice processing part, mobile station modem part, memory part, and power supply part.
2.2 Configuration
2.2.1 Keypad/LCD and Receptacle Part
This is used to transmit keypad signals to MSM3000. It is made up of a keypad backlight part that illuminates the
keypad, LCD part that displays the operation status onto the screen, and a receptacle that receives and sends out
voice and data with external sources.
2.2.2 Voice Processing Part
The voice processing part is made up of an audio codec used to convert MIC signals into digital voice signals
and digital voice signals into analog voice signals,
amplifying parts for amplifying the voice signals and MIC signals are on Codec.
2.2.3 MSM3000 (Mobile Station Modem) Part
MSM3000 is the core elements of a CDMA mobile station and carries out the functions of CPU, encoder,
interleaver, deinterleaver, Viterbi decoder, Mod/Demod, and vocoder.
2.2.4 Memory Part
The memory part is made up of a flash memory, a SRAM, and an EEPROM.
2.2.5 Power Supply Part
The power supply part is made up of 5 Regulators and direct connet to Batt.
Regulator(150mA )s give the power each Circuits(TX chain, RX chain, IFT and ITR, Codec).
Regulator(200mA) gives the power MSM and memory .
PAM, Motor, LED is directly conneted to Batt.
