STV8203 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STV8203' PDF : 31 Pages View PDF
STV8203
PROGRAMMING THE DEVICE (continued)
3 - Register Description
3.1 - Registers Not Controlled By Autostandard (except some mentioned bits)
PRE-FM (Prescale FM Level)
Address
Type
Reset
: 02
: R/W
: 0001 1101
bit 7
0
bit 6
0
bit 5
0
bit 4
bit 3
bit 2
FM PRESCALE
bit 1
bit 0
FM PRESCALE
: 00000 0dB
01100 +12dB
10100 -12dB
(step size = 1dB, range = ±12dB in 2’s complement)
Sets the reference level for an FM signal. Note, this is also dependant on the PLL programming. For
example, with default settings for the PLL, an FM deviation of 27kHz will result in a signal 17dB below full
scale before de-emphasis. At 1kHz, the internal de-emphasisgain is 14dB giving a level of -3dB. Full scale
output from the DAC is 2VRMS corresponding to 0dB. and so for 1VRMS, PRE-FM should be set to -3dB.
PRE-NICAM (Prescale NICAM Level)
Address
Type
Reset
: 03
: R/W
: 0001 1101
bit 7
0
bit 6
0
bit 5
0
bit 4
bit 3
bit 2
bit 1
NICAM PRESCALE
bit 0
NICAM PRESCALE : 00000 0dB
01100 +12dB
10100 -12dB
(step size = 1dB, range = ±12dB in 2’s complement)
Sets the reference level for a NICAM signal. For example, a full scale NICAM signal at 1kHz would be
received at -12dB before de-emphasis. Internal de-emphasis gain at this frequency is 9dB so for 1VRMS,
pre-nicam should be set to -3dB.
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