STV8203 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STV8203' PDF : 31 Pages View PDF
STV8203
PROGRAMMING THE DEVICE (continued)
SCOEFF (Symbol Tracking Loop Filter Coefficients)
Address
Type
Reset
: 2F
: R/W
: 0001 1100
bit 7
DMX-OF
bit 6
0
bit 5
bit 4
PLF_A
bit 3
bit 2
bit 1
PLF_B
bit 0
DMX-OF : Symbol tracking control : 0 = QPSK, 1 = FM.
In QPSK mode, the symbol tracking loop is closed.
PLF_A : A coefficient (proportional)
Programme the symbol tracking loop filter proportional coefficient A :
PLF_A [5:3]
000
001
010
011
100
101
110
111
Value
0
1
2
4
8
16
32
Not used
PLF_B
: B coefficient (integral)
Program the symbol tracking loop filter integral coefficient B :
PLF_B [2:0]
000
001
010
011
100
101
110
111
Value
0
1/16
1/32
1/64
1/128
1/256
1/512
1/1024
SRF (Symbol Tracking Loop Frequency)
Address
Type
Reset
: 30
: R/W
: 0000 0000
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
SYMBOL RECOVERY FREQUENCY
bit 1
bit 0
This register provides access to the control signal for the symbol tracking loop (2’s complement). If read,
it indicates a value proportional to the symbol tracking frequency error. If written to, it will preset the
frequency error.
SRF [7:0]
Approx. Error (kHz)
10000000
-8
00000000
0
01111111
+8
RESET
After a reset sequence, all the registers controllable by AUTOSTANDARD function (FIR, COFQ, FIFQ,
ACOEFF, BCOEFF, SCOEFF, SRF) are adjusted for the standard I configuration (channel 1 to FM mono
mode and channel 2 to QPSK mode).
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