REV. 0
ADF4106
–12–
Table IV. AB Counter Latch Map
DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
C2 (0) C1 (1)
A1A2A3A4A5B1B2B3B4B5B6B7B8B9B10B11B12B13 A6
CONTROL
BITS
6-BIT A COUNTER
13-BIT B COUNTER
DB21
RESERVED
DB22DB23
CP GAIN
G1
THESE BITS ARE NOT USED
BY THE DEVICE AND ARE
DON'T CARE BITS.
F4 (FUNCTION LATCH)
FASTLOCK ENABLE CP GAIN OPERATION
0 0 CHARGE PUMP CURRENT SETTING
1 IS PERMANENTLY USED
0 1 CHARGE PUMP CURRENT SETTING
2 IS PERMANENTLY USED
1 0 CHARGE PUMP CURRENT SETTING
1 IS USED
1 1 CHARGE PUMP CURRENT IS
SWITCHED TO SETTING 2. THE
TIME SPENT IN SETTING 2 IS
DEPENDENT ON WHICH FASTLOCK
MODE IS USED. SEE FUNCTION
LATCH DESCRIPTION
A COUNTER
A6 A5 .......... A2 A1 DIVIDE RATIO
0 0 .......... 0 0 0
0 0 .......... 0 1 1
0 0 .......... 1 0 2
0 0 .......... 1 1 3
. . .......... . . .
. . .......... . . .
. . .......... . . .
1 1 .......... 0 0 60
1 1 .......... 0 1 61
1 1 .......... 1 0 62
1 1 .......... 1 1 63
N = BP + A, P IS PRESCALER VALUE SET IN THE FUNCTION LATCH.
B MUST BE GREATER THAN OR EQUAL TO A. FOR CONTINUOUSLY
ADJACENT VALUES OF (N F
REF
), AT THE OUTPUT, N
MIN
IS (P
2
- P)
XX
X = DON’T CARE
B13 B12 B11 B3 B2 B1 B COUNTER DIVIDE RATIO
0 0 0 .......... 0 0 0 NOT ALLOWED
0 0 0 .......... 0 0 1 NOT ALLOWED
0 0 0 .......... 0 1 0 NOT ALLOWED
0 0 0 .......... 1 1 1 3
. . . .......... . . . .
. . . .......... . . . .
. . . .......... . . . .
1 1 1 .......... 1 0 0 8188
1 1 1 .......... 1 0 1 8189
1 1 1 .......... 1 1 0 8190
1 1 1 .......... 1 1 1 8191
