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STV8216 датащи(PDF) 54 Page - STMicroelectronics

номер детали STV8216
подробное описание детали  Multistandard TV Audio Processor and Digital Sound Demodulator
PDF  97 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STV8216 датащи(HTML) 54 Page - STMicroelectronics

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Register List
STV82x6
54/97
CETH2
Channel 2 FM Carrier Level Threshold
SQTH2
Channel 2 FM Squelch Threshold
Bit Name
Reset
Function
CRF2[7:0]
00000000
Channel 2 Carrier Recovery Frequency.
Displays the instantaneous frequency offset of the Channel 2 Baseband PLL
Address (hex): 38h
Type: R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
CETH2[7:0]
Bit Name
Reset
Function
CETH2[7:0]
00100000
This register is used to compare the carrier level in the channel and the threshold value. This
level is measured after the channel filter and is relative to the full scale reference level (0 dB).
This is used as part of the validation of an FM signal, if the carrier level is below the threshold,
the signal is considered to be non-valid.
CETH
Threshold (dB)
CETH
Threshold (dB)
FFh
-6
10h
-32
80h
-12
08h
-38
40h
-18
00h
OFF (All carrier levels are accepted)
20h
-24 (Default)
Address (hex): 39h
Type: R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
SQTH2[7:0]
Bit Name
Reset
Function
SQTH2[7:0]
00111100
The squelch detector measures the level of high frequency noise (> 40 kHz) and compares it to
the threshold level (SQTH). If the level is below this value, the S/N of the FM signal is
considered to be acceptable. Values are given for FM with standard deviation.
SQTH
S/N (dB)
FAh
0
77h
10
3Ch
15 (Default)
23h
20
19h
25



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