Datasheet
ADA4320-1
Rev. A | Page 10 of 16
–24
–28
–32
–36
–40
–44
–48
–52
–56
–60
–64
–68
–72
ADJACENT CHANNEL POWER RATIO (dBc)
25 4241403938373635343332313029282726
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
08707-018
Figure 17. ACPR vs. Input Level for a Single QPSK Channel
–10
–80
–70
–60
–50
–40
–30
–20
ADJACENT CHANNEL POWER RATIO (dBc)
59 717069686766656463626160
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
08707-020
Figure 18. ACPR vs. Output Level for a Single QPSK Channel
8
6
–8
–6
–4
–2
0
2
4
OUTPUT AMPLITUDE (V)
–2 1814 16121086420
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
08707-022
Figure 19. Transmit Enable/Disable Response
–22
–70
–64
–58
–52
–46
–40
–34
–28
ADJACENT CHANNEL POWER RATIO (dBc)
12 3129 3028272625242322212019181716151413
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
08707-019
Figure 20. ACPR vs. Input Level for 4× QAM64 Channels
–10
–80
–70
–60
–50
–40
–30
–20
ADJACENT CHANNEL POWER RATIO (dBc)
44 626058565452504846
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
08707-021
Figure 21. ACPR vs. Output Level for 4x QAM64 Channels
120
100
80
60
40
20
0
OUTPUT GLITCH AMPLITUDE (mV p-p)
0648 544236302418126
GAIN CODE
0
TXEN = 1
TXEN = 0
DOCSIS 3.0 LIMIT (FOR 29dBmV INPUT)
08707-023
Figure 22. Output Glitch Amplitude vs. Gain Code