ada4320-1 Analog Devices, Inc., ada4320-1 Datasheet - Page 10

• Manufacturer Part Number: ada4320-1
• Description: High Power, Low Distortion Upstream Catv Line Driver Ada4320-1
• Manufacturer: Analog Devices, Inc.

ADA4320-1
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Figure 18. ACPR vs. Output Level for a Single QPSK Channel
8
6
4
2
0
Figure 17. ACPR vs. Input Level for a Single QPSK Channel
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59
–2
SINGLE QPSK CHANNEL
GAIN CODE 42 (14dB)
CHANNEL WIDTH = 6.4MHz
DRIVEN CHANNEL CENTER = 42 MHz
ADJACENT CHANNEL WIDTH = 6.4 MHz
ADJACENT CHANNEL CENTER = 48.4 MHz
SINGLE QPSK CHANNEL
GAIN CODE 60 (MAXIMUM)
CHANNEL WIDTH = 6.4MHz
DRIVEN CHANNEL CENTER = 42MHz
ADJACENT CHANNEL WIDTH = 6.4MHz
ADJACENT CHANNEL CENTER = 48.4MHz
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60
Figure 19. Transmit Enable/Disable Response
0
CURRENT LEVEL 0
CURRENT LEVEL 1
CURRENT LEVEL 2
CURRENT LEVEL 3
CURRENT LEVEL 0
CURRENT LEVEL 1
CURRENT LEVEL 2
CURRENT LEVEL 3
27
TXEN
61
28
4× QAM64 CHANNELS (UNCORRELATED)
OUTPUT LEVEL = 53dBmV/CHANNEL
CHANNEL WIDTH = 1.6MHz
CHANNEL CENTERS = 39.6MHz, 41.2MHz, 42.8MHz, 44.4MHz)
2
29
62
30
4
OUTPUT LEVEL (dBmV)
63
INPUT LEVEL (dBmV)
31
PEAK OUTPUT
6
32
64
ENVELOPE
TIME (µs)
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65
8
34
66
35
10
36
67
12
37
68
38
14
39
69
40
16
70
41
42
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Rev. 0 | Page 10 of 16
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120
100
80
60
40
20
0
Figure 21. ACPR vs. Output Level for 4x QAM64 Channels
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44
Figure 20. ACPR vs. Input Level for 4× QAM64 Channels
0
4× QAM64 CHANNELS (UNCORRELATED)
GAIN CODE 42 (14dB)
CHANNEL WIDTH = 1.6MHz
DRIVEN CHANNEL CENTER = 77.8MHz, 79.4MHz,
ADJACENT CHANNEL WIDTH = 1.6MHz
ADJACENT CHANNEL CENTER = 84.2MHz
4× QAM64 CHANNELS (UNCORRELATED)
GAIN CODE 60 (MAXIMUM)
CHANNEL WIDTH = 1.6MHz
DRIVEN CHANNEL CENTER = 77.8MHz, 79.4MHz,
ADJACENT CHANNEL WIDTH = 1.6MHz
ADJACENT CHANNEL CENTER = 84.2MHz
81.0MHz, 82.6MHz
81.0MHz, 82.6MHz
13
Figure 22. Output Glitch Amplitude vs. Gain Code
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46
6
CURRENT LEVEL 0
CURRENT LEVEL 1
CURRENT LEVEL 2
CURRENT LEVEL 3
CURRENT LEVEL 0
CURRENT LEVEL 1
CURRENT LEVEL 2
CURRENT LEVEL 3
TXEN = 1
TXEN = 0
DOCSIS 3.0 LIMIT (FOR 29dBmV INPUT)
15
12
16
48
OUTPUT LEVEL (dBmV/CHANNEL)
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INPUT LEVEL (dBmV/CHANNEL)
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18
50
19
24
20
GAIN CODE
52
21
30
22
54
23
36
24
56
25
42
26
58
27
48
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60
29 30
54
31
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6
0