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MSP3445G Datasheet(PDF) 9 Page - List of Unclassifed Manufacturers |
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MSP3445G Datasheet(HTML) 9 Page - List of Unclassifed Manufacturers |
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9 / 98 page  PRELIMINARY DATA SHEET MSP 34x5G Micronas 9 2.1. Architecture of the MSP 34x5G Family Fig. 2–1 on page 8 shows a simplified block diagram of the IC. The block diagram contains all features of the MSP 3455G. Other members of the MSP 34x5G family do not have the complete set of features: The demodu- lator handles only a subset of the standards presented in the demodulator block; NICAM processing is only possible in the MSP 3415G and MSP 3455G (see dashed block in Fig. 2–1). 2.2. Sound IF Processing 2.2.1. Analog Sound IF Input The input pins ANA_IN1+ and ANA_IN − offer the pos- sibility to connect sound IF (SIF) sources to the MSP 34x5G. The analog-to-digital conversion of the sound IF signal is done by an A/D-converter. An ana- log automatic gain circuit (AGC) allows a wide range of input levels. The high-pass filter formed by the cou- pling capacitor at pin ANA_IN1+ (see Section 7. “Appendix D: Application Information” on page 93) is sufficient in most cases to suppress video compo- nents. Some combinations of SAW filters and sound IF mixer ICs, however, show large picture components on their outputs. In this case, further filtering is recom- mended. 2.2.2. Demodulator: Standards and Features The MSP 34x5G is able to demodulate all TV sound standards worldwide including the digital NICAM sys- tem. Depending on the MSP 34x5G version, the fol- lowing demodulation modes can be performed: A2-Systems: Detection and demodulation of two sep- arate FM carriers (FM1 and FM2), demodulation and evaluation of the identification signal of carrier FM2. NICAM-Systems: Demodulation and decoding of the NICAM carrier, detection and demodulation of the ana- log (FM or AM) carrier. For D/K-NICAM, the FM carrier may have a maximum deviation of 384 kHz. Very high deviation FM-Mono: Detection and robust demodulation of one FM carrier with a maximum devi- ation of 540 kHz. BTSC-Stereo: Detection and FM demodulation of the aural carrier resulting in the MTS/MPX signal. Detec- tion and evaluation of the pilot carrier, AM demodula- tion of the (L-R)-carrier and detection of the SAP sub- carrier. Processing of the DBX noise reduction or Micronas Noise Reduction (MNR). BTSC-Mono + SAP: Detection and FM demodulation of the aural carrier resulting in the MTS/MPX signal. Detection and evaluation of the pilot carrier, detection and FM demodulation of the SAP-subcarrier. Process- ing of the DBX noise reduction or Micronas Noise Reduction (MNR). Japan Stereo: Detection and FM demodulation of the aural carrier resulting in the MPX signal. Demodulation and evaluation of the identification signal and FM demodulation of the (L-R)-carrier. FM-Satellite Sound: Demodulation of one or two FM carriers. Processing of high-deviation mono or narrow bandwidth mono, stereo, or bilingual satellite sound according to the ASTRA specification. FM-Stereo-Radio: Detection and FM demodulation of the aural carrier resulting in the MPX signal. Detection and evaluation of the pilot carrier and AM demodula- tion of the (L-R)-carrier. The demodulator blocks of all MSP 34x5G versions have identical user interfaces. Even completely differ- ent systems like the BTSC and NICAM systems are controlled the same way. Standards are selected by means of MSP Standard Codes. Automatic processes handle standard detection and identification without controller interaction. The key features of the MSP 34x5G demodulator blocks are Standard Selection: The controlling of the demodula- tor is minimized: All parameters, such as tuning fre- quencies or filter bandwidth, are adjusted automati- cally by transmitting one single value to the STANDARD SELECT register. For all standards, spe- cific MSP standard codes are defined. Automatic Standard Detection: If the TV sound stan- dard is unknown, the MSP 34x5G can automatically detect the actual standard, switch to that standard, and respond the actual MSP standard code. Automatic Carrier Mute: To prevent noise effects or FM identification problems in the absence of an FM carrier, the MSP 34x5G offers a configurable carrier mute feature, which is activated automatically if the TV sound standard is selected by means of the STAN- DARD SELECT register. If no FM carrier is detected at one of the two MSP demodulator channels, the corre- sponding demodulator output is muted. This is indi- cated in the STATUS register. |
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