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AD9517-1A/PCBZ Datenblatt(PDF) 45 Page - Analog Devices

Teilenummer AD9517-1A/PCBZ
Bauteilbeschribung  12-Output Clock Generator with Integrated 2.5 GHz VCO
PDF  80 Pages
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD9517-1A/PCBZ Datenblatt(HTML) 45 Page - Analog Devices

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Data Sheet
AD9517-1
Rev. E | Page 45 of 80
Duty Cycle and Duty-Cycle Correction (Divider 2 and
Divider 3)
The same duty cycle and DCC considerations apply to Divider 2
and Divider 3 as to Divider 0 and Divider 1 (see the Duty Cycle
and Duty-Cycle Correction (0, 1) section); however, with these
channel dividers, the number of possible configurations is even
more complex.
Duty-cycle correction on Divider 2 and Divider 3 requires the
following channel divider conditions:
•
An even DX.Y must be set as MX.Y = NX.Y (low cycles = high
cycles).
•
An odd DX.Y must be set as MX.Y = NX.Y + 1 (the number of
low cycles must be one greater than the number of high
cycles).
•
If only one divider is bypassed, it must be the second
divider, X.2.
•
If only one divider has an even divide-by, it must be the
second divider, X.2.
The possibilities for the duty cycle of the output clock from
Divider 2 and Divider 3 are shown in Table 40 through
Table 44.
Table 40. Divider 2 and Divider 3 Duty Cycle; VCO Divider
Used; Duty Cycle Correction Off (DCCOFF = 1)
VCO
Divider
DX.1
DX.2
Output
Duty Cycle
NX.1 + MX.1 + 2
NX.2 + MX.2 + 2
Even
1
1
50%
Odd = 3
1
1
33.3%
Odd = 5
1
1
40%
Even
Even, odd
1
(NX.1 + 1)/
(NX.1 + MX.1 + 2)
Odd
Even, odd
1
(NX.1 + 1)/
(NX.1 + MX.1 + 2)
Even
Even, odd
Even, odd
(NX.2 + 1)/
(NX.2 + MX.2 + 2)
Odd
Even, odd
Even, odd
(NX.2 + 1)/
(NX.2 + MX.2 + 2)
Table 41. Divider 2 and Divider 3 Duty Cycle; VCO Divider
Not Used; Duty Cycle Correction Off (DCCOFF = 1)
Input Clock
Duty Cycle
DX.1
DX.2
Output
Duty Cycle
NX.1 + MX.1 + 2
NX.2 + MX.2 + 2
50%
1
1
50%
X%
1
1
X%
50%
Even, odd
1
(NX.1 + 1)/
(NX.1 + MX.1 + 2)
X%
Even, odd
1
(NX.1 + 1)/
(NX.1 + MX.1 + 2)
50%
Even, odd
Even, odd
(NX.2 + 1)/
(NX.2 + MX.2 + 2)
X%
Even, odd
Even, odd
(NX.2 + 1)/
(NX.2 + MX.2 + 2)
Table 42. Divider 2 and Divider 3 Duty Cycle; VCO Divider
Used; Duty Cycle Correction Is On (DCCOFF = 0); VCO
Divider Input Duty Cycle = 50%
VCO
Divider
DX.1
DX.2
Output
Duty Cycle
NX.1 + MX.1 + 2
NX.2 + MX.2 + 2
Even
1
1
50%
Odd
1
1
50%
Even
Even (NX.1 = MX.1)
1
50%
Odd
Even (NX.1 = MX.1)
1
50%
Even
Odd (MX.1 = NX.1 + 1)
1
50%
Odd
Odd (MX.1 = NX.1 + 1)
1
50%
Even
Even (NX.1 = MX.1)
Even (NX.2 = MX.2)
50%
Odd
Even (NX.1 = MX.1)
Even (NX.2 = MX.2)
50%
Even
Odd (MX.1 = NX.1 + 1)
Even (NX.2 = MX.2)
50%
Odd
Odd (MX.1 = NX.1 + 1)
Even (NX.2 = MX.2)
50%
Even
Odd (MX.1 = NX.1 + 1)
Odd (MX.2 = NX.2 + 1)
50%
Odd
Odd (MX.1 = NX.1 + 1)
Odd (MX.2 = NX.2 + 1)
50%
Table 43. Divider 2 and Divider 3 Duty Cycle; VCO Divider
Used; Duty Cycle Correction On (DCCOFF = 0); VCO
Divider Input Duty Cycle = X%
VCO
Divider
DX.1
DX.2
Output
Duty Cycle
NX.1 + MX.1 + 2
NX.2 + MX.2 + 2
Even
1
1
50%
Odd = 3
1
1
(1 + X%)/3
Odd = 5
1
1
(2 + X%)/5
Even
Even
(NX.1 = MX.1)
1
50%
Odd
Even
(NX.1 = MX.1)
1
50%
Even
Odd
(MX.1 = NX.1 + 1)
1
50%
Odd = 3
Odd
(MX.1 = NX.1 + 1)
1
(3NX.1 + 4 + X%)/
(6NX.1 + 9)
Odd = 5
Odd
(MX.1 = NX.1 + 1)
1
(5NX.1 + 7 + X%)/
(10NX.1 + 15)
Even
Even
(NX.1 = MX.1)
Even
(NX.2 = MX.2)
50%
Odd
Even
(NX.1 = MX.1)
Even
(NX.2 = MX.2)
50%
Even
Odd
(MX.1 = NX.1 + 1)
Even
(NX.2 = MX.2)
50%
Odd
Odd
(MX.1 = NX.1 + 1)
Even
(NX.2 = MX.2)
50%
Even
Odd
(MX.1 = NX.1 + 1)
Odd
(MX.2 = NX.2 + 1)
50%
Odd = 3
Odd
(MX.1 = NX.1 + 1)
Odd
(MX.2 = NX.2 + 1)
(6NX.1NX.2 + 9NX.1 +
9NX.2 + 13 + X%)/
(3(2NX.1 + 3)
(2NX.2 + 3))
Odd = 5
Odd
(MX.1 = NX.1 + 1)
Odd
(MX.2 = NX.2 + 1)
(10NX.1NX.2+ 15NX.1 +
15NX.2 + 22 + X%)/
(5(2 NX.1 + 3)
(2 NX.2 + 3))



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