EVAL-ADF4108EBZ1 Datasheet, PDF (13/20 Pages) Analog Devices – PLL Frequency Synthesizer

Data Sheet
ADF4108
AB COUNTER LATCH MAP
RESERVED
13-BIT B COUNTER
6-BIT A COUNTER
CONTROL
BITS
DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
X
X
G1 B13 B12 B11 B10 B9
B8
B7
B6
B5
B4
B3
B2
B1
A6
A5
A4
A3
A2
A1 C2 (0) C1 (1)
X = DON’T CARE
B13
B12
B11
B3
B2
B1
0
0
0
0
0
0
0
0
.
.
.
.
.
.
1
1
1
1
1
1
1
1
0
..........
0
0
..........
0
0
..........
0
0
..........
0
.
..........
.
.
..........
.
.
..........
.
1
..........
1
1
..........
1
1
..........
1
1
..........
1
0
0
0
1
1
0
1
1
.
.
.
.
.
.
0
0
0
1
1
0
1
1
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
B COUNTER DIVIDE RATIO
NOT ALLOWED
NOT ALLOWED
NOT ALLOWED
3
.
.
.
8188
8189
8190
8191
F4 (FUNCTION LATCH)
FASTLOCK ENABLE
0
0
1
1
G1
CP GAIN
0
1
0
1
OPERATION
CHARGE PUMP CURRENT
SETTING 1 IS PERMANENTLY USED.
CHARGE PUMP CURRENT
SETTING 2 IS PERMANENTLY USED.
CHARGE PUMP CURRENT
SETTING 1 IS USED.
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.
THESE BITS ARE NOT USED
BY THE DEVICE AND ARE
DON'T CARE BITS.
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 (P² – P).
Figure 17. AB Counter Latch Map
Rev. B | Page 13 of 20