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STV8203 Datasheet(PDF) 7 Page - STMicroelectronics |
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STV8203 Datasheet(HTML) 7 Page - STMicroelectronics |
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7 / 31 page  USING STV8203 1 - Hardware 1.a - Power Supplies (see Figure 2) The IC is using two main power supplies : -DVDD5 supplies all the digital part VNom. =5V. This power supply can be switched-off in stand- by mode. -AVCC supplies the audio matrixpart : if VNom. =8V then the output voltage swing on output pins can reach 2VRMS,if VNom. = 5V then the output voltage swing on output pins can reach 1VRMS. 1.b - Sound Subcarrier Filters Sound demodulation and decoding are very easy with thisdevice providing all the necessaryfunctions for that purpose, including the channel filters. These FIR base-bandfilters give the best selectivity of the desired channeland providesin NICAM mode the correct cosine roll-off response. This implies that no external filters are required (except may be a simple high-pass filter, if the saw filters and sound IF demodulators used in the ap- plication create picture interferences). The filters can be automatically set for B/G/H/I/L/L’ standards. They can also be easily tuned through I 2C for M, D, K, K1. 1.c - Audio Matrix The mono output (MOUT) can output L1, R1 or (L1+R1)/2 signal. A typical application is the possi- bility to record a selected channel in mono mode on the linear track of a VCR separatelyfrom the record- ing of the stereo signal,providingthe facility to select between stereo or mono signals in the playback mode in case of marginal noise conditions. 1.d - Stand-by Stand-by with THRU mode : the analog part of the device has its own power supply (AVCC) allowing this part to keep working even when the digital part, powered by the 5V power supply (DVDD5), is in stand-by. In this case, the audio matrix is put in a special setting : - LIL1 to AOL2, - LIR1 to AOR2, - LIL2 to AOL1, - LIR2 to AOR1, - input gain = 0dB. This allows to achieve a ”THRU” mode from SCART1 input to SCART2 output and SCART2 input to SCART1 output, providing a copy facility from SCARTIN to SCARTOUT. 2 - Software Two modes of operation are available : 2.a - Optimized Program Mode Four standards have default setting stored in order to allow a very easy programmation. Only some registers may have to be programmed (these reg- isters are shown in bold in the Figure 3) but in most cases, the reset values will be sufficient. In Fig- ure 3, CTL and STAT represent registers which are controlled by the ”standard processor”. These reg- isters are located between address 23Hex and 3CHex in the complete list of registers. 2.b - Advanced Operation Mode In that mode, all the read/write registers (as men- tionned in the complete list) can be programmed manually and changed from their reset values. The additionnal registers accessible in this mode are shown in bold in Figure 4. This mode can be selected by putting the bits [3:0] of AO-CONTROL register to 0. 41 11 21 AV CC DV DD5 GND AUDIO MATRIX DEMODULATION AND CONTROL PART Pins 5-32-42 GND Figure 2 STV8203 7/31 |
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