Interface Description EMII-1900 Service Manual Application Information
EMII-1900 V1.0 AnyDATA.NET Proprietary
Use Subject to Restrictions
3. Digital/Voice Processing Part
3.1 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
receptacle part, voice processing part, mobile station modem part, memory part, and power supply part.
3.2 Configuration
3.2.1 Voice Processing Part
The voice processing part is made up of an Integrated codec with microphone and earphone amplifiers,
two microphone inputs and one Auxiliary audio input, internal vocoder supporting 13kbps EVRC and
digital audio interface via USB. The anplifing voice signals out of MSM send to the earpiece or speaker
and signals coming out from MIC transfer to the audio processor
3.2.2 MSM (Mobile Station Modem) Part
MSM5105 is the core elements of CDMA terminal and carries out the functions of CPU, encoder,
interleaver, deinterleaver, Viterbi decoder, Mod/Demod, and vocoder.
3.2.3 Memory Part
The memory part is made up of a stacked MCP(Multi-Chip Package) Flash memory and SRAM cmos.
3.2.4 Power Supply Part
The power supply part is made up of circuits for generating various types of power, used for the
digital/voice processing part.
+4.0V from external DC(6~12V) is fed into six regulators(U601, U602, U603, U606, U607, U609). The
five regulators pr3.0V for the Rx parts, Tx parts, Memory and MSM. The one regular produces
+2.7V ,VDD_A, VDD_C for the MSM.
