ML5805
SERIAL WORD DEFINITIONS
There are two types of serial words used, specified by the state of Bit 23. Bit 23=0 sets the serial word type to
‘frequency’ and Bit 23=1 specifies the serial transaction type as a ‘configuration word’.
Bit
Definition
Specifies whether this serial transaction is type PLL frequency or type
configuration register.
Value Definition
23
0
PLL frequency specification word
1
Configuration register specification word
22:0
Data
PLL Frequency Word
The PLL Frequency Word may be sent during standby (XCEN=0) or operation (XCEN=1).
Bit
Value
Definition
23
0
Specifies PLL frequency word
22:20
19:0
Integer part of the PLL programming variable
Fractional part of the PLL programming variable
IPART
FPART
The frequency of the channel is controlled by the configuration PLL Frequency Word defined above and the input
reference frequency. The expression for the channel frequency is
N
220
⎡
⎤
fch = 3 fref H + I +
MHz,
⎢
⎣
⎥
⎦
where;
N = FPART(the fractional part of the DSM programming value),
I = IPART(the integer part of the DSM programming value),
H = DIVBASEOFFS + 147 for f ref = 12.288MHz (RATE= 2, 3, or 4),
DIVBASEOFFS + 130 for f ref = 13.824MHz (RATE= 0 or 1),
DIVBASEOFFS = a variable defined in Register 3 (default = 8),
RATE= a variable defined in Register 0 (default = 0),
f ref = 12.288MHz or 13.824MHz.
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