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MAX2112
Complete, Direct-Conversion
Tuner for DVB-S2 Applications
Typical Operating Characteristics (continued)
(MAX2112 Evaluation Kit: V CC = +3.3V, T A = +25°C, baseband output frequency = 5MHz; V GC1 = +1.2V, default register settings
except BBG[3:0] = 1011.)
BASEBAND FILTER HIGHPASS
FREQUENCY RESPONSE
PROGRAMMED f -3dB FREQUENCY
vs. MEASURED f -3dB FREQUENCY
BASEBAND FILTER 3dB FREQUENCY
vs. TEMPERATURE
2
0
-2
-4
45
40
35
30
25
LPF[7:0] = 12 + (f -3dB - 4MHz)/290kHz
1.0
0.8
0.6
0.4
0.2
NORMALIZED TO T A = +25 ° C
-6
0
-8
-10
-12
-14
20
15
10
5
0
-0.2
-0.4
-0.6
-0.8
-1.0
100
1000
10,000
0
5
10
15
20
25
30
35
40
45
-40
-20
0 20 40
60
80
BASEBAND FREQUENCY (MHz)
INPUT POWER vs. V GC1
PROGRAMMED f -3dB FREQUENCY (MHz)
NOISE FIGURE vs. FREQUENCY
TEMPERATURE ( ° C)
NOISE FIGURE vs. INPUT POWER
10
0
-10
-20
ADJUST BBG[3:0] FOR 1V P-P BASEBAND
OUTPUT WITH
P IN = -75dBm AND V GC1 = 0.5V
T A = +25 ° C
10.5
10.0
9.5
ADJUST BBG[3:0] FOR 1V P-P BASEBAND
OUTPUT WITH P IN = -75dBm
AND V GC1 = 0.5V
T A = +85 ° C
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
-40
T A = -40 ° C
T A = +85 ° C
9.0
T A = +70 ° C
40
30
-50
8.5
20
-60
-70
-80
8.0
7.5
T A = +25 ° C
10
0
0.5
1.0
1.5 2.0
2.5
3.0
900
1100 1300 1500 1700 1900 2100 2300
-80
-70
-60
-50
-40 -30
-20 -10
0
30
20
V GC1 (V)
OUT-OF-BAND IIP3 vs. INPUT POWER
SEE NOTE 4 ON PAGE 4 FOR CONDITIONS
30
20
FREQUENCY (MHz)
IN-BAND IIP3 vs. INPUT POWER
SEE NOTE 3 ON PAGE 4 FOR CONDITIONS
60
50
INPUT POWER (dBm)
IIP2 vs. INPUT POWER
SEE NOTE 5 ON PAGE 4 FOR CONDITIONS
10
40
10
0
0
-10
-20
30
20
-10
-20
-30
-30
-40
-50
-60
10
0
-10
-80
-70
-60
-50
-40 -30
-20 -10
0
-80
-70
-60
-50
-40 -30
-20 -10
0
-80
-70
-60
-50
-40 -30
-20 -10
0
6
INPUT POWER (dBm)
INPUT POWER (dBm)
INPUT POWER (dBm)
Maxim Integrated
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