AD9884AKS-140 Analog Devices Inc, AD9884AKS-140 Datasheet - Page 17

• Manufacturer Part Number: AD9884AKS-140
• Description: IC ANALOG INTRFC 140MSPS 128MQFP
• Manufacturer: Analog Devices Inc

Specifications of AD9884AKS-140

• Rohs Status: RoHS non-compliant
• Display Type: LCD
• Interface: Analog
• Current - Supply: 135mA
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -20°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 128-MQFP, 128-PQFP
• Configuration: -
• Digits Or Characters: -

Standard
VGA
SVGA
XGA
SXGA
UXGA
VESA Monitor Timing Standards and Guidelines, September 17, 1998
*Graphics sampled at 1/2 incoming pixel rate using Alternate Pixel Sampling mode.
Figure 11 illustrates the AD9884A’s jitter as a percentage of the
total clock period over the range of operating frequencies.
Though the jitter is very low over most of the range (less than
5% of the pixel period), the jitter increases at clock rates below
40 MHz. At lower frequencies, the jitter can be reduced by
operating the AD9884A at twice the desired frequency, and
using only every other data sample produced. This can be easily
implemented by placing the part in Dual Channel mode (for
example, as in Figure 21), and reading the data from only one of
the output ports. The DATACK and DATACK outputs will
run at the desired, lower, sample rate.
REV. C
Table VII. Recommended VCORNGE and CURRENT Settings for Standard Display Formats
Resolution
640 × 480
800 × 600
1024 × 768
1280 × 1024
1600 × 1200
Refresh
Rate
60 Hz
72 Hz
75 Hz
85 Hz
56 Hz
60 Hz
72 Hz
75 Hz
85 Hz
60 Hz
70 Hz
75 Hz
80 Hz
85 Hz
60 Hz
75 Hz
85 Hz
60 Hz
65 Hz
70 Hz
75 Hz
85 Hz
Horizontal
Frequency
31.5 kHz
37.7 kHz
37.5 kHz
43.3 kHz
35.1 kHz
37.9 kHz
48.1 kHz
46.9 kHz
53.7 kHz
48.4 kHz
56.5 kHz
60.0 kHz
64.0 kHz
68.3 kHz
64.0 kHz
80.0 kHz
91.1 kHz
75.0 kHz
81.3 kHz
87.5 kHz
93.8 kHz
106.3 kHz
–17–
15
10
Figure 11. Pixel Clock Jitter vs. Frequency
5
0
0
Pixel Rate
25.175 MHz
31.500 MHz
31.500 MHz
36.000 MHz
36.000 MHz
40.000 MHz
50.000 MHz
49.500 MHz
56.250 MHz
65.000 MHz
75.000 MHz
78.750 MHz
85.500 MHz
94.500 MHz
108.000 MHz
135.000 MHz
157.500 MHz*
162.000 MHz*
175.500 MHz*
189.000 MHz*
202.500 MHz*
229.500 MHz*
20
JITTER p-p (%)
40
FREQUENCY – MHz
60
OVERSAMPLED RATE
VCORNGE
00
00
00
00
00
00
00
00
01
01
01
01
10
10
10
11
01
01
10
10
10
10
80
JITTER p-p (%)
100
120
AD9884A
140
CURRENT
000
000
000
001
001
001
010
001
010
010
011
011
011
011
011
100
100
100
100
101
101
110
160