ADF4251 Dual Fractional-N/Interger-N Frequency ... - Analog Devices
ADF4251 Dual Fractional-N/Interger-N Frequency ... - Analog Devices
ADF4251 Dual Fractional-N/Interger-N Frequency ... - Analog Devices
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<strong>ADF4251</strong><br />
Table IV. RF R Divider Register Map<br />
PRE-<br />
SCALER<br />
RF REF IN<br />
DOUBLER<br />
4-BIT RF R COUNTER<br />
12-BIT INTERPOLATOR MODULUS VALUE (MOD)<br />
CONTROL<br />
BITS<br />
DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0<br />
P3<br />
P2<br />
R4<br />
R3<br />
R2<br />
R1<br />
M12<br />
M11<br />
M10<br />
M9<br />
M8<br />
M7<br />
M6<br />
M5<br />
M4<br />
M3<br />
M2<br />
M1<br />
C3 (0)<br />
C2 (0) C1 (1)<br />
P2<br />
RF REF IN<br />
DOUBLER<br />
0 DISABLED<br />
1 ENABLED<br />
INTERPOLATOR MODULUS<br />
M12 M11 M10 M3 M2 M1 VALUE (MOD) DIVIDE RATIO<br />
0 0 0 .......... 0 1 0 2<br />
0 0 0 .......... 0 1 1 3<br />
0 0 0 .......... 1 0 0 4<br />
. . . .......... . . . .<br />
. . . .......... . . . .<br />
. . . .......... . . . .<br />
1 1 1 .......... 1 0 0 4092<br />
P3<br />
RF PRESCALER<br />
1 1 1 .......... 1 0 1 4093<br />
0 4/5<br />
1 8/9<br />
1 1 1 .......... 1 1 0 4094<br />
1 1 1 .......... 1 1 1 4095<br />
RF R COUNTER<br />
R4 R3 R2 R1 DIVIDE RATIO<br />
0 0 0 1 1<br />
0 0 1 0 2<br />
0 0 1 1 3<br />
. . . . .<br />
. . . . .<br />
. . . . .<br />
1 1 0 1 13<br />
1 1 1 0 14<br />
1 1 1 1 15<br />
REV. 0<br />
–15–
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