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AD9690 Datasheet(PDF) 28 Page - Analog Devices

Part # AD9690
Description  Analog-to-Digital Converter
PDF  79 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD9690 Datasheet(HTML) 28 Page - Analog Devices

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Data Sheet
AD9690
Rev. B | Page 27 of 78
65
70
75
80
85
90
95
450.3
480.3
510.3
515.3
ANALOG INPUT FREQUENCY (MHz)
610.3
765.3
810.3
985.3
4.0×
5.0×
6.0×
7.0×
8.0×
Figure 71. Buffer Current Sweeps, AD9690-500 (SFDR vs. IBUFF);
450 MHz < fIN < 1000 MHz; Front-End Network Shown in Figure 64
40
45
50
55
60
65
70
75
80
1010.3
1205.3
1410.3
1600.3
1810.3
1950.3
ANALOG INPUT FREQUENCY (MHz)
4.0×
5.0×
6.0×
7.0×
8.0×
Figure 72. Buffer Current Sweeps, AD9690-500 (SFDR vs. IBUFF);
1 GHz < fIN < 2GHz; Front-End Network Shown in Figure 64
30
40
50
60
70
80
90
100
10.3
95.3
150.3
180.3
240.3
301.3
340.7
390.3
450.3
ANALOG INPUT FREQUENCY (MHz)
1.0×
1.5×
2.0×
3.0×
4.5×
Figure 73. SFDR vs. fIN; Buffer Control 1 (0x018) = 1.0×, 1.5×, 2.0×, 3.0×, or 4.5×
Table 10. Recommended Register Settings for SFDR Optimization at Different Input Frequencies
Product
Frequency
Buffer
Control 1
(0x018)
Buffer
Control 2
(0x019)
Buffer
Control 3
(0x01A)
Buffer
Control 4
(0x11A)
Buffer
Control 5
(0x935)
Input
Full-Scale
Range
(0x025)
Input
Full-Scale
Control
(0x030)
Input
Termination
(0x016)1
Input
Capacitance
(0x934)
AD9690-
500
DC to
250 MHz
0x20
0x60
0x0A
0x00
0x04
0x0C
0x04
0x0C/0x1C/…
0x1F
250 MHz to
500 MHz
0x70
0x60
0x0A
0x00
0x04
0x0C
0x04
0x0C/0x1C/…
0x1F
500 MHz to
1 GHz
0x80
0x40
0x08
0x00
0x00
0x08
0x18
0x0C/0x1C/…
0x1F or
0x002
1 GHz to
2 GHz
0xF0
0x40
0x08
0x00
0x00
0x08
0x18
0x0C/0x1C/…
0x1F or
0x001
AD9690-
1000
DC to
150 MHz
0x10
0x50
0x09
0x00
0x04
0x0A
0x18
0x0E/0x1E/…
0x1F
DC to
500 MHz
0x40
0x50
0x09
0x00
0x04
0x0A
0x18
0x0E/0x1E/…
0x1F
500 MHz to
1 GHz
0xA0
0x60
0x09
0x20
0x00
0x08
0x18
0x0E/0x1E/…
0x1F or
0x001
1 GHz to
2 GHz
0xD0
0x70
0x09
0x20
0x00
0x08
0x18
0x0E/0x1E/…
0x1F or
0x001
1
The input termination can be changed to accommodate the application with little or no impact to ac performance.
2
The input capacitance can be set to 1.5 pF to achieve wider input bandwidth but results in slightly lower ac performance.



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