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STV8247T Fiches technique(PDF) 69 Page - STMicroelectronics

No de pièce STV8247T
Description  Digital Audio Decoder/Processor for A2 and NICAM Television/Video Recorders
PDF  149 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STV8247T Fiches technique(HTML) 69 Page - STMicroelectronics

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STV82x7
Register List
SCOEFF
Channel 2 Symbol Tracking Loop Coefficients
Bit Name
Reset
Function
BCOEFF2[7:0]
10101100
This value defines the loop bandwidth used to program the Integral Coefficient of the Baseband
PLL loop filter and DCO gain. See Table 15 and Table 16.
Table 15: Baseband PLL Loop Filter Adjustments (FM Mode)
FM mode
Small
Standard
Mid
Wide
A2 standard
ACOEFF
10h
22h
2Ch
2Ch
10h
BCOEFF
1Ah
12h
0Ah
0Ah
11h
FM_DEV max (kHz)
62.5
125
250
500
125
DCO Range (kHz)
96
192
384
768
192
Table 16: Baseband PLL Loop Filter Adjustments (QPSK Mode)
QPSK mode
Small
Medium
Large
Extra-large
ACOEFF
90h
90h
90h
90h
BCOEFF
ACh
A3h
9Ah
91h
DCO_DEV max (kHz)
2.84375
5.6875
11.375
22.75
Address: 35h
Type: R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
SCOEFF[7:0]
Bit Name
Reset
Function
SCOEFF[7:0]
00011100
This value is used to program the proportional and integral coefficients of the QPSK Symbol
tracking loop. See Table 17 and Table 18.
Table 17: QPSK System - BG/L/DK Standards (40% Roll-off)
Extra-Small
Small
Medium
Large
Extra-Large
Open Loop
SCOEFF
1Eh
25h
24h
26h
2Ah
80h
Table 18: QPSK System - I Standard (100% Roll-off)
Extra-Small
Small
Medium
Large
Extra-Large
SCOEFF
16h
1Dh
1Ch
23h
22h



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