User Manual

PROGRAMMING
3-2
June 1997
Part No. 001-3412-002
3.2.2 D-WORD CALCULATION (24-BITS)
The D-Word programs the Main, Reference and
Auxiliary dividers, and sets the modulus.
NR = 350 Ftcxo/50 kHz=350
where Ftcxo=17.5 MHz
SM = 00 Reference select for main phase detector
EM = 1 Main divider enable flag
SA = 00 Reference select for aux. phase detector
EA = 0 Aux. divider enable flag
FMOD = 1 Selects modulo 8
LONG = 0 Send with 24 bit A0 format
D Word = 0xA1 0x5E 0x22
Figure 3-2 D-WORD
4
321 141312111098765 2019181715 16 24232221
1 1 0 0 1 1 1 1 00/100000011100000
ADDRESS
BITS
= 350 FOR 50 kHz REFERENCE
EA (ALWAYS 0)
FMOD (1 = MODULUS 8, 0 = MODULUS 5)
SA (NOT USED)
EM (ALWAYS 1)
SM (ALWAYS 00)
LONG (0=24 BIT WORD)
NR (REFERENCE DIVIDE)
3.2.3 C-WORD CALCULATION (24-BITS)
The C-Word is not used in the DM-3412 synthe-
sizer load.