AD9271 Analog Devices, AD9271 Datasheet - Page 18

• Manufacturer Part Number: AD9271
• Description: Octal LNA/VGA/AAF/ADC and Crosspoint Switch
• Manufacturer: Analog Devices

Specifications of AD9271

• Resolution (bits): 12bit
• # Chan: 8
• Sample Rate: 50MSPS
• Interface: LVDS,Ser
• Analog Input Type: SE-Uni
• Ain Range: 0.25 V p-p,0.32 V p-p,0.4 V p-p
• Adc Architecture: Pipelined
• Pkg Type: QFP

AD9271
Figure 32. Second-Order Harmonic Distortion vs. Frequency, AIN = −0.5 dBFS
Figure 30. Antialiasing Filter (AAF) Pass-Band Response, No HPF Applied
–50
–55
–60
–65
–70
–75
–80
–85
–10
–15
–20
–25
–30
–35
–40
300
250
200
150
100
Figure 31. Antialiasing Filter (AAF) Group Delay Response
–5
50
0
0
0.1
2
0
V
V
–3dB LINE
V
GAIN
GAIN
2.5
GAIN
4
= 0.2V
= 0.5V
= 1V
5.0
ANALOG INPUT FREQUENCY (MHz)
V
GAIN
6
7.5
V
1
GAIN
= 0.5V
FREQUENCY (MHz)
10.0
= 1.0V
8
f
IN
12.5
(MHz)
(1/3) × 25MSPS
10
(1/3) × 40MSPS
15.0
V
GAIN
10
17.5
= 0V
12
(1/3) × 50MSPS
20.0
14
22.5
25.0
100
16
Rev. B | Page 18 of 60
Figure 33. Third-Order Harmonic Distortion vs. Frequency, AIN = −0.5 dBFS
Figure 34. Second-Order Harmonic Distortion vs. ADC Output Level
Figure 35. Third-Order Harmonic Distortion vs. ADC Output Level
–100
–110
–100
–110
–50
–55
–60
–65
–70
–75
–80
–85
–40
–50
–60
–70
–80
–90
–40
–50
–60
–70
–80
–90
–40
–40
2
V
GAIN
–35
–35
4
= 1V
V
GAIN
–30
–30
= 0.2V
ADC OUTPUT LEVEL (dBFS)
ADC OUTPUT LEVEL (dBFS)
6
–25
–25
V
GAIN
8
f
IN
–20
–20
= 0.5V
(MHz)
10
V
GAIN
–15
–15
V
GAIN
= 0V
12
= 0V
–10
–10
V
V
GAIN
GAIN
V
V
GAIN
GAIN
14
= 1V
= 1V
–5
–5
= 0.5V
= 0.5V
1
0
0
6