Divide (Duty Cycle<" />
參數(shù)資料
型號: AD9513BCPZ
廠商: Analog Devices Inc
文件頁數(shù): 13/28頁
文件大?。?/td> 0K
描述: IC CLOCK DIST 3OUT PLL 32LFCSP
標準包裝: 1
類型: 扇出緩沖器(分配),除法器
PLL:
輸入: 時鐘
輸出: CMOS,LVDS
電路數(shù): 1
比率 - 輸入:輸出: 1:3
差分 - 輸入:輸出: 是/是
頻率 - 最大: 800MHz
除法器/乘法器: 是/無
電源電壓: 3.135 V ~ 3.465 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 32-VFQFN 裸露焊盤,CSP
供應(yīng)商設(shè)備封裝: 32-LFCSP-VQ(5x5)
包裝: 托盤
產(chǎn)品目錄頁面: 776 (CN2011-ZH PDF)
配用: AD9513/PCBZ-ND - BOARD EVAL FOR AD9513
AD9513
Rev. 0 | Page 20 of 28
Table 16. OUT0 Divide or OUT2 Divide
S9
S10
OUT0
Divide (Duty Cycle1)
S2 ≠ 2/3
OUT2
Divide (Duty Cycle1)
S2 = 2/3
0
1
7 (43%)
1/3
0
2 (50%)
11 (45%)
2/3
0
3 (33%)
13 (46%)
1
0
4 (50%)
14 (50%)
0
1/3
5 (40%)
17 (47%)
1/3
6 (50%)
19 (47%)
2/3
1/3
8 (50%)
20 (50%)
1
1/3
9 (44%)
21 (48%)
0
2/3
10 (50%)
22 (50%)
1/3
2/3
12 (50%)
23 (48%)
2/3
15 (47%)
25 (48%)
1
2/3
16 (50%)
26 (50%)
0
1
18 (50%)
27 (48%)
1/3
1
24 (50%)
28 (50%)
2/3
1
30 (50%)
29 (48%)
1
32 (50%)
31 (48%)
1 Duty cycle is the clock signal high time divided by the total period.
DIVIDER PHASE OFFSET
The phase offset of OUT1 and OUT2 can be selected (see Table 13
to Table 15). This allows the relative phase of the outputs to be set.
After a SYNC operation (see the Synchronization section), the
phase offset word of each divider determines the number of
input clock (CLK) cycles to wait before initiating a clock output
edge. By giving each divider a different phase offset, output-to-
output delays can be set in increments of the fast clock period, tCLK.
Figure 24 shows four cases, each with the divider set to divide = 4.
By incrementing the phase offset from 0 to 3, the output is
offset from the initial edge by a multiple of tCLK.
01
4
123
5
9
67
8
10
14
11 12 13
5
tCLK
CLOCK INPUT
CLK
DIVIDER OUTPUT
DIV = 4
PHASE = 0
PHASE = 1
PHASE = 2
PHASE = 3
tCLK
2 × tCLK
3 × tCLK
05
59
5-
02
4
Figure 24. Phase Offset—Divider Set for Divide = 4, Phase Set from 0 to 2
For example:
CLK = 491.52 MHz
tCLK = 1/491.52 = 2.0345 ns
For Divide = 4:
Phase Offset 0 = 0 ns
Phase Offset 1 = 2.0345 ns
Phase Offset 2 = 4.069 ns
Phase Offset 3 = 6.104 ns
The outputs can also be described as:
Phase Offset 0 = 0°
Phase Offset 1 = 90°
Phase Offset 2 = 180°
Phase Offset 3 = 270°
Setting the phase offset to Phase = 4 results in the same relative
phase as Phase = 0° or 360°.
The resolution of the phase offset is set by the fast clock period
(tCLK) at CLK. The maximum unique phase offset is less than the
divide ratio, up to a phase offset of 15.
Phase offsets can be related to degrees by calculating the phase
step for a particular divide ratio:
Phase Step = 360°/Divide Ratio
Using some of the same examples:
Divide = 4
Phase Step = 360°/4 = 90°
Unique Phase Offsets in Degrees Are Phase = 0°, 90°,
180°, 270°
Divide = 9
Phase Step = 360°/9 = 40°
Unique Phase Offsets in Degrees Are Phase = 0°, 40°, 80°,
120°, 160°, 200°, 240°, 280°, 320°
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