Samsung SCH-i830 Service Manual page 6

Circuit Description
Clock
CPU clock : 19.2MHz. This clock signal from the TCXO
Sleep clock : 32.768KHz. This clock signal is used for sleep.
TCXO/N : 19.2/N MHz. This clock source is used by various blocks of the MSM6500
device, such as the ARM9CORE, UARTs, general-purpose PDMs and
TCXO is also used by the MSM6500 device to produce CHIPX8.
USB clock : 48MHz. This clock signal is used to drive the USB interface
2-1-3. RF Interface Part
CDMA Data Interface
- TX_Q_P, TX_Q_N, TX_I_P, TX_I_N (UCP800) : Tx analog signal used during CDMA
- RX_I_P, RX_Q_P, RX_I_N, RX_Q_N (UCP800): RX analog signal used during CDMA
RF Interface
- TX : TX_AGC_ADJ(UCP100) is used to control the TX power,
PA_ON_PCS(UCP100) is used to control the PCS power amplifier and
PA_ON_CELL(UCP100) is used to control the CDMA power amplifier.
- RX : TRK_LO_ADJ(UCP100) is used to compensate the TCXO module.
2-1-4. Audio Part
The MSM6500 integrates an audio voiceband Codec into Mobile Station Modem.
The integrated Codec contains all of the required conversion and amplification stages for the
audio front end.
The Codec operates as a 13bit linear Codec with the transmit(TX) and
receive(RX) filters designed to meet ITU-TG.712 requirement. The CODEC contains the
software controller amplifier for both the receiving and transmitting sections. Also, the
vocoding schemes used will be 13kbps QCELP and 8Kbps EVRC. The QCELP vocoder is
based in the MSM internally.
Tx Audio Path
The voice signal from the microphone is inputted to the internal CODEC. The voice signal is then
amplified by the internal amplifier and is converted to PCM data to be outputted to the MSM as 13bit
data. This data is then processed by the MSM(UCP800)'s internal.
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