Upstream CATV Amplifier
Typical Operating Characteristics (continued)
(V
= +5V, V = +34dBmV, TXEN = SHDN = high, f = 20MHz, Z
otherwise noted.)
= 75Ω through a 2:1 transformer, T = +25°C, unless
CC
IN
IN
LOAD
A
OUTPUT IMPEDANCE
(75Ω REFERENCE)
VOLTAGE GAIN vs. GAIN-CONTROL WORD
GAIN STEP vs. GAIN-CONTROL WORD
30
28
26
24
22
20
18
16
14
MAX3510 toc10
1.25
1.15
1.05
0.95
0.85
0.75
5MHz
f = 40MHz
f = 5MHz
TRANSMIT-DISABLE
MODE
TRANSMIT
MODE
f = 60MHz
65MHz
48 50 52 54 56 58 60 62 64
GAIN-CONTROL WORD (DECIMAL)
0
6
12 18 24 30 36 42 48 54 60
GAIN-CONTROL WORD (DECIMAL)
POWER-UP/POWER-DOWN
TRANSIENTS vs. OUTPUT LEVEL
TRANSMIT OUTPUT NOISE vs. GAIN
OUTPUT RETURN LOSS vs. FREQUENCY
-20
-25
-30
-35
-40
-45
-50
0
100
10
1
4
8
TRANSMIT
MODE
TRANSMIT-DISABLE
MODE
12
16
20
0.1
-33
-27 -21 -15 -9 -3
3
9
15 21 27
5
15 25 35 45 55 65 75 85 95 105
FREQUENCY (MHz)
0
10
20
30
40
50
60
GAIN (dB)
OUTPUT LEVEL (dBmV)
2nd HARMONIC DISTORTION vs.
INPUT FREQUENCY AND OUTPUT LEVEL
3rd HARMONIC DISTORTION vs.
INPUT FREQUENCY
-40
-45
-50
-55
-60
-65
-70
-75
-80
-35
-40
-45
-50
-55
-60
-65
-70
-75
V
= 60dBmV
OUT
V
= 57dBmV
OUT
V
= 60dBmV
OUT
V
= 54dBmV
OUT
V
= 6dBmV
OUT
V
= 48dBmV
OUT
V
= 30dBmV
OUT
V
= 24dBmV
OUT
V
= 6dBmV
OUT
0
10
20
30
40
50
60
70
0
10
20
30
40
50
60
70
FREQUENCY (MHz)
INPUT FREQUENCY (MHz)
_______________________________________________________________________________________
5
ROCHESTER [ Rochester Electronics ]
