ADA4320-1

Rev. 0 | Page 10 of 16

–24

–28

–32

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–60

–64

–68

–72

25

42

41

40

39

38

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36

35

34

33

32

31

30

29

28

27

26

INPUT LEVEL (dBmV)

CURRENT LEVEL 0

CURRENT LEVEL 1

CURRENT LEVEL 2

CURRENT LEVEL 3

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

Figure 17. ACPR vs. Input Level for a Single QPSK Channel

–10

–80

–70

–60

–50

–40

–30

–20

59

71

70

69

68

67

66

65

64

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62

61

60

OUTPUT LEVEL (dBmV)

CURRENT LEVEL 0

CURRENT LEVEL 1

CURRENT LEVEL 2

CURRENT LEVEL 3

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

Figure 18. ACPR vs. Output Level for a Single QPSK Channel

8

6

–8

–6

–4

–2

0

2

4

–2

18

14

16

12

10

8

6

4

2

0

TIME (µs)

4× QAM64 CHANNELS (UNCORRELATED)

OUTPUT LEVEL = 53dBmV/CHANNEL

CHANNEL WIDTH = 1.6MHz

CHANNEL CENTERS = 39.6MHz, 41.2MHz, 42.8MHz, 44.4MHz)

TXEN

PEAK OUTPUT

ENVELOPE

Figure 19. Transmit Enable/Disable Response

–22

–70

–64

–58

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–40

–34

–28

12

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29 30

28

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25

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14

13

INPUT LEVEL (dBmV/CHANNEL)

CURRENT LEVEL 0

CURRENT LEVEL 1

CURRENT LEVEL 2

CURRENT LEVEL 3

4× QAM64 CHANNELS (UNCORRELATED)

GAIN CODE 42 (14dB)

CHANNEL WIDTH = 1.6MHz

DRIVEN CHANNEL CENTER = 77.8MHz, 79.4MHz,

81.0MHz, 82.6MHz

ADJACENT CHANNEL WIDTH = 1.6MHz

ADJACENT CHANNEL CENTER = 84.2MHz

Figure 20. ACPR vs. Input Level for 4× QAM64 Channels

–10

–80

–70

–60

–50

–40

–30

–20

44

62

60

58

56

54

52

50

48

46

OUTPUT LEVEL (dBmV/CHANNEL)

CURRENT LEVEL 0

CURRENT LEVEL 1

CURRENT LEVEL 2

CURRENT LEVEL 3

4× QAM64 CHANNELS (UNCORRELATED)

GAIN CODE 60 (MAXIMUM)

CHANNEL WIDTH = 1.6MHz

DRIVEN CHANNEL CENTER = 77.8MHz, 79.4MHz,

81.0MHz, 82.6MHz

ADJACENT CHANNEL WIDTH = 1.6MHz

ADJACENT CHANNEL CENTER = 84.2MHz

Figure 21. ACPR vs. Output Level for 4x QAM64 Channels

120

100

80

60

40

20

0

06

48

54

42

36

30

24

18

12

6

GAIN CODE

0

TXEN = 1

TXEN = 0

DOCSIS 3.0 LIMIT (FOR 29dBmV INPUT)

Figure 22. Output Glitch Amplitude vs. Gain Code