Maxon Electronics Australia Pty. Ltd. MM-5500SU ユーザーズマニュアル
FCC Documentation
MM-5500SU CDMA 1X/EVDO Modem
18/18
Confidential and proprietary information.
This document is the sole and exclusive property of Maxon Australia.
Not to be distributed or divulged without prior written agreement.
This document is the sole and exclusive property of Maxon Australia.
Not to be distributed or divulged without prior written agreement.
5.6.2
Logic Part
(CDMA Engine)
5.6.2.1
DC Power supply Part(CDMA Engine)
The voltage regulator on interface board step-downs the supplied voltage to 3.75V for CDMA
Engine.
Each block of CDMA Engine uses low-drop-output linear regulator.
- U500 : voltage regulator for digital circuit ( 2.8 DC )
- U501 : voltage regulator for VC-TCXO and S1M8656A( 3.0V DC )
- U502 : voltage regulator for RF Rx part ( 3.0V DC )
- U503 : voltage regulator for RF Tx part ( 2.85V DC )
- U505 : voltage regulator for digital part(2.7V DC )
- And power AMP is directly supplied by battery.
5.6.2.2
Digital Part(CDMA Engine)
-
U400 : MSM(Mobile Station Modem) ASIC is chip responsible for CDMA/FM mobile
station’s base-band digital signal processing. For this chip to function, TCXO(19.2MHz) is
required as basic clocks And sleep crystal (32.768KHz) is used as clock source of MSM
ASIC.
MSM consists of CDMA core and DFM core. CDMA core is a part for processing CDMA
signal consisting of modulator/demodulator, interleaver/deinterleaver and encoder/decoder
in the CDMA mode.
5.6.2.3
Memory Part (CDMA Engine)
Memory part consists of Flash memory and SRAM.
Flash memory : store to main program.
SRAM : performs to read and write data
The system adapt CSP type memory, combination to Flash memory and SRAM