
M
Upstream CATV Amplifiers
______________________________________________________________________________________
11
Typical Operating Characteristics (continued)
(Typical operating circuit; V
CC
= +5V, V
IN
= +34dBmV, TXEN =
SHDN
= high, f
IN
= 20MHz, Z
LOAD
= 75
, T
A
= +25
°
C, unless
otherwise noted.)
MAX3514/MAX3517 (continued)
-80
-70
-75
-60
-65
-55
-50
0
30
40
10
20
INPUT FREQUENCY (MHz)
50
60
70
2ND HARMONIC DISTORTION
vs. INPUT FREQUENCY
M
2
6dBmV, LN
20dBmV, LN
50dBmV, HP
61dBmV, HP
-80
-70
-75
-60
-65
-55
-50
0
30
40
10
20
INPUT FREQUENCY (MHz)
50
60
70
3RD HARMONIC DISTORTION
vs. INPUT FREQUENCY
M
3
6dBmV, LN
20dBmV, LN
50dBmV, HP
61dBmV, HP
0.1
0
140
80
40
POWER-UP/DOWN TRANSIENTS
vs. GAIN CODE
1
10
100
M
GAIN CODE
T
20
60
100
120
HIGH-POWER MODE
LOW-NOISE MODE
0
-16
1
10
100
OUTPUT RETURN LOSS vs. FREQUENCY
(75
SYSTEM)
-12
-14
M
FREQUENCY (MHz)
O
-8
-10
-6
-4
-2
HIGH-POWER MODE
LOW-NOISE MODE/
TRANSMIT DISABLE
M
OUTPUT IMPEDANCE
(75
SYSTEM)
LOW NOISE MODE/
TRANSMIT DISABLE MODE
HIGH-POWER MODE
-100
-80
-90
-60
-70
-40
-50
-30
-10
-20
0
500kHz/div
OUTPUT SPECTRUM
M
(
VOUT = 61dBmV
α
= 0.25
1280ksps
-100
-80
-90
-60
-70
-40
-50
-30
-10
-20
0
100kHz/div
OUTPUT SPECTRUM
M
(
VOUT = 61dBmV
α
= 0.25
160ksps
-100
-80
-90
-60
-70
-40
-50
-30
-10
-20
0
5.5MHz/div
OUTPUT SPECTRUM
M
(
VOUT = 61dBmV
α
= 0.25
1280ksps