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AD9888 Arkusz danych(PDF) 11 Page - Analog Devices

Numer części AD9888
Szczegółowy opis  100/140/170/205 MSPS Analog Flat Panel Interface
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
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AD9888 Arkusz danych(HTML) 11 Page - Analog Devices

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REV. A
AD9888
–11–
CP
0.0039 F
CZ
0.039 F
FILT
RZ
3.3k
PVD
Figure 6. PLL Loop Filter Detail
Four programmable registers are provided to optimize the per-
formance of the PLL. These registers are:
1. The 12-Bit Divisor Registers. The input Hsync frequencies
range from 15 kHz to 110 kHz. The PLL multiplies the
frequency of the Hsync signal, producing pixel clock fre-
quencies in the range of 10 MHz to 205 MHz. The Divisor
Register controls the exact multiplication factor. This regis-
ter may be set to any value between 221 and 4095. (The
divide ratio that is actually used is the programmed divide
ratio plus one.)
2. The 2-Bit VCO Range Register. To lower the sensitivity of
the output frequency to noise on the control signal, the VCO
operating frequency range is divided into four overlapping
regions. The VCO Range register sets this operating range.
Because there are only four possible regions, only the two
least significant bits of the VCO Range register are used. The
frequency ranges for the lowest and highest regions are shown
in Table II.
3. The 3-Bit Charge Pump Current Register. This register allows
the current that drives the low-pass loop filter to be varied.
The possible current values are listed in Table III.
Table II. VCO Frequency Ranges
Pixel Clock Range
KVCO Gain
PV1
PV0
(MHz)
(MHz/V)
0
0
10–45
22.5
0
1
45–90
45
1
0
90–150
90
1
1
150+
180
Table III. Charge Pump Current/Control Bits
Ip2
Ip1
Ip0
Current ( A)
00050
001100
010150
011250
100350
101500
110750
1
1
1
1500
Table IV. Recommended VCO Range and Charge Pump Current Settings for Standard Display Formats
Refresh
Horizontal
Standard
Resolution
Rate (Hz)
Frequency (kHz)
Pixel Rate (MHz)
VCORNGE
Current
VGA
640
× 480
60
31.5
25.175
00
010
72
37.7
31.500
00
100
75
37.5
31.500
00
100
85
43.3
36.000
00
100
SVGA
800
× 600
56
35.1
36.000
00
100
60
37.9
40.000
00
101
72
48.1
50.000
01
011
75
46.9
49.500
01
011
85
53.7
56.250
01
011
XGA
1024
× 768
60
48.4
65.000
01
100
70
56.5
75.000
01
100
75
60.0
78.750
01
101
80
64.0
85.500
01
101
85
68.3
94.500
10
011
SXGA
1280
× 1024
60
64.0
108.000
10
011
75
80.0
135.000
10
100
85
91.1
157.500
11
100
UXGA
1600
× 1200
60
75.0
162.000
11
100
65
81.3
175.500
11
100
70
87.5
189.000
11
101
75
93.8
202.500
11
101
85
106.3
229.500*
10
110
QXGA
2048
× 1536
60
260.000*
11
100
2048
× 1536
75
315.000*
11
100
*Graphics sampled at 1/2 the incoming pixel rate using Alternate Pixel Sampling mode.


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