MSP 3400C
PRELIMINARY DATA SHEET
6.2.5. DCO-Increments
For a chosen TV standard, a corresponding set of 24-bit
increments determining the mixing frequencies of the
quadrature mixers, has to be written into the IC. In Table
6–11, several examples of DCO increments are listed.
It is necessary to divide them into low part and high part.
The formula for the calculation of the increments for any
chosen IF-Frequency is as follows:
24
INCR
= int(f/fs 2 )
dez
with: int = integer function
f
f
= IF-frequency in MHz
= sampling frequency (18.432 MHz)
S
Conversion of INCR into hex-format and separation of
the 12-bit low and high parts lead to the required incre-
ments. (DCO1_HI or _LO for channel 1, DCO2_HI or LO
for channel 2).
Table 6–11: DCO increments for the MSP 3400C; frequency in MHz, increments in Hex
Frq. MHz
DCO_HI
DCO_LO
Frq. MHz
DCO_HI
DCO_LO
4.5
03E8
0000
5.04
5.5
5.58
5.7421875
0460
04C6
04D8
04FC
0000
038E
0000
00AA
5.76
5.85
5.94
0500
0514
0528
0000
0000
0000
6.0
6.2
6.5
6.552
0535
0561
05A4
05B0
0555
0C71
071C
0000
6.6
6.65
6.8
05BA
05C5
05E7
0AAA
0C71
01C7
7.02
7.38
0618
0668
0000
0000
7.2
0640
0690
0000
0000
7.56
26
MICRONAS INTERMETALL
MICRONAS [ MICRONAS ]
