Complete, Direct-Conversion Tuner for DVB-S
and Free-to-Air Applications
Typical Operating Characteristics (continued)
(MAX2120 Evaluation Kit: V CC = +3.3V, baseband output frequency = 5MHz; V GC1 = 1.2V; T A = +25°C. Default register settings
except BBG[3:0] = 1011.)
NOISE FIGURE vs. INPUT POWER
OUT-OF-BAND IIP3 vs. INPUT POWER
70
60
50
ADJUST BBG[3:0] FOR 1V P-P
BASEBAND OUTPUT WITH
P IN = -75dBm AND V GC1 = 0.5V
f LO = 1500MHz
30
20
SEE NOTE 4 ON PAGE 4 FOR CONDITIONS
10
40
0
30
20
10
0
-10
-20
-30
-80
-70
-60
-50
-40 -30
-20 -10
0
-80
-70
-60
-50
-40 -30
-20 -10
0
INPUT POWER (dBm)
IN-BAND IIP3 vs. INPUT POWER
INPUT POWER (dBm)
IIP2 vs. INPUT POWER
30
20
SEE NOTE 3 ON PAGE 4 FOR CONDITIONS
60
50
SEE NOTE 5 ON PAGE 4 FOR CONDITIONS
10
0
-10
-20
-30
-40
-50
-60
40
30
20
10
0
-10
-80
-70
-60
-50
-40 -30
-20 -10
0
-80
-70
-60
-50
-40 -30
-20 -10
0
0
-5
INPUT POWER (dBm)
INPUT RETURN LOSS vs. FREQUENCY
-70
-72
-74
-76
INPUT POWER (dBm)
PHASE NOISE AT 10kHz OFFSET
vs. CHANNEL FREQUENCY
-10
-15
-20
V GC1 = 0.5V
-78
-80
-82
-84
-86
-88
-25
900
V GC1 = 2.7V
1125 1350
1575
1800
2025
2250
-90
925
1115 1305 1495 1685 1875 2065 2255
FREQUENCY (MHz)
CHANNEL FREQUENCY (MHz)
_______________________________________________________________________________________
7
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