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CDCF5801 датащи(PDF) 5 Page - Texas Instruments

номер детали CDCF5801
подробное описание детали  CLOCK MULTIPLIER
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CDCF5801 датащи(HTML) 5 Page - Texas Instruments

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PLL DIVIDER/MULITPLIER SELECTION
Not Recommended for New Designs
CDCF5801
SCAS698F – SEPTEMBER 2003 – REVISED APRIL 2006
Table 1. Input-to-Output Settings
INPUT
OUTPUT
FREQUENCY
PREDIVIDER
POST DIVIDER
INPUT-TO-OUTPUT
FREQUENCY (MHz)
NOTE
(MHz)
MULTIPLICATION-RATIO
FROM
TO
FROM
TO
MULT0
MULT1
P0
P1
P2
8
12.5
35
100
280
1
0
1
1
12.5
39
50
156
1
0
1
0
4
25
70
100
280
1
1
1
1
12.5
39
25
78
1
0
0
1
2
25
78
50
156
1
1
0
1
0
Normal operation(1)
50
140
100
280
0
0
1
1
25
78
25
78
1
1
0
1
1
50
156
50
156
0
0
1
0
100
240
100
240
0
1
1
1
CLKOUT high-impedance
X
X
0
0
CLOUOTB high-impedance
CLKOUT = high
X
X
1
0
1
Special mode of operation
CLKOUTB = high
CLKOUT = P2
X
X
1
X
CLKOUTB = P2
(1)
There is some overlapping of the input frequency ranges for multiplication ratios of 1, 2, and 4. For example, an input frequency of 30
MHz for a multiplication ratio of four falls within both the 12.5 to 39-MHz range and the 25 to 70-MHz range. For best device operation in
a case such as this, always select the input frequency range nearer to the top of the table.
Table 2. Power Down Modes
STATE
PWRDNB
STOPB
CLKOUT and CLKOUTB
Power down
0
X
GNDO
Clock stop
1
0
VO, STOP
Normal
1
1
See Table 1
Table 3. Programmable Delay and Phase Alignment
DLYCTR
NOTE
LEADLAG
CLKOUT and CLKOUTB
Advanced by one step:
For every 32 edges, there are one or two
Each rising
step size: 1/768 of the CLKOUT period (1.3 mUI) at P[1:2] = 11
HI
edges for which the phase aligner does not
edge+
1/1536 of the CLKOUT period (0.65 mUI) at P[1:2] = 10
update the phase. Therefore, CLKOUT
1/3072 of the CLKOUT period (0.325 mUI) at P[1:2] = 01
phase is not updated for every 32nd edge.
Delayed by one step:
The frequency of the DLYCTRL pin should
Each rising
step size: 1/768 of the CLKOUT period (1.3 mUI) at P[1:2] = 11
always be equal to or less than the
LO
edge+
1/1536 of the CLKOUT period (0.65 mUI) at P[1:2] = 10
frequency of the LEADLAG pin.
1/3072 of the CLKOUT period (0.325 mUI) at P[1:2] = 01
5
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