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.)
0
-10
-20
-30
-40
-50
-60
-70
-80
BASEBAND FILTER
FREQUENCY RESPONSE
2
0
-2
-4
-6
-8
-10
-12
-14
BASEBAND FILTER HIGHPASS
FREQUENCY RESPONSE
0
20
40
60
80
100
1000
10,000
BASEBAND FREQUENCY (MHz)
PROGRAMMED f -3dB FREQUENCY
vs. MEASURED f -3dB FREQUENCY
BASEBAND FREQUENCY (MHz)
BASEBAND FILTER 3dB FREQUENCY
vs. TEMPERATURE
45
40
35
30
LPF[7:0] = 12 + (f -3dB - 4MHz) / 290kHz
1.0
0.8
0.6
0.4
NORMALIZED TO T A = +25 ° C
0.2
25
20
15
10
5
0
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
5
10
15
20
25
30
35
40
45
0
10
20
30
40
50
60
70
PROGRAMMED f -3dB FREQUENCY (MHz)
INPUT POWER vs. V GC1
TEMPERATURE ( ° C)
NOISE FIGURE vs. FREQUENCY
10
0
-10
ADJUST BBG[3:0] FOR 1V P-P
BASEBAND OUTPUT WITH
P IN = -75dBm AND V GC1 = 0.5V
10.0
9.5
ADJUST BBG[3:0] FOR 1V P-P
BASEBAND OUTPUT WITH
P IN = -75dBm AND V GC1 = 0.5V
-20
-30
T A = +25°C
T A = +70°C
9.0
T A = +70°C
-40
-50
-60
-70
-80
8.5
8.0
7.5
T A = +25°C
0.5
1.0
1.5
2.0
2.5
3.0
900
1100 1300 1500 1700 1900 2100 2300
V GC1 (V)
FREQUENCY (MHz)
6
_______________________________________________________________________________________
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