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STV8217T Datasheet(PDF) 70 Page - STMicroelectronics

No. de pieza STV8217T
Descripción Electrónicos  Digital Audio Decoder/Processor for A2 and NICAM Television/Video Recorders
PDF  149 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STV8217T Datasheet(HTML) 70 Page - STMicroelectronics

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Register List
STV82x7
70/149
SRF
Channel 2 Symbol Tracking Loop Frequency
CRF2
Channel 2 Baseband PLL Demodulator Offset
CETH2
Channel 2 FM Carrier Level Threshold
Address: 36h
Type: R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
SRF[7:0]
Bit Name
Reset
Function
SRF[7:0]
00000000
Displays in two’s complement format the frequency deviation between the incoming NICAM
bitstream and the quartz clocks. The maximum error is ±250 ppm.
Address: 37h
Type: R
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
CRF2[7:0]
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: 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



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