MAX2121ETI 查看數據表（PDF） - Maxim Integrated
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MAX2121ETI Datasheet PDF : 18 Pages
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Complete Direct-Conversion L-Band Tuner
Typical Operating Characteristics (continued)
(MAX2121 Evaluation Kit: VCC = +3.3V, TA = +25°C, baseband output frequency = 5MHz, VGC1 = +1.2V, default register settings
except BBG[3:0] = 1011, unless otherwise noted.)
BASEBAND FILTER 3dB FREQUENCY
vs. TEMPERATURE
1.00
NORMALIZED AT TA = +25°C
0.75
0.50
0.25
0
-0.25
-0.50
-0.75
-1.00
-40 -20 0 20 40 60 80
TEMPERATURE (°C)
NOISE FIGURE vs. LO FREQUENCY
(TA = +25°C)
11.0
10.5
ADJUST BBG[3:0] FOR 1VP-P BASEBAND
10.0 OUTPUT WITH PIN = -75dBm AND VGC1 = 0.5V
9.5
9.0 10dB BACKED OFF GAIN
8.5
8.0
7.5
7.0
900
1150 1400 1650 1900 2150
LO FREQUENCY (MHz)
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
100
BASEBAND FILTER HIGHPASS
FREQUENCY RESPONSE
1000
BASEBAND FREQUENCY (Hz)
10,000
INPUT RETURN LOSS vs. FREQUENCY
0
VOLTAGE GAIN vs. VGC1
80
70
BBG[3:0] = 1111
60
50
40
30
20
10
0
0 0.5 1.0 1.5 2.0 2.5 3.0
VGC1 (V)
PHASE NOISE AT 10kHz OFFSET vs.
CHANNEL FREQUENCY
-90
-5
-10
VGC1 = 0.5V
-95
-15
-20
-25
900
VGC1 = 2.7V
1125 1350 1575 1800 2025 2250
FREQUENCY (MHz)
-100
-105
925 1115 1305 1495 1685 1875 2065 2255
CHANNEL FREQUENCY (MHz)
PHASE NOISE vs. OFFSET FREQUENCY
-90
-100
LO LEAKAGE vs. LO FREQUENCY
-70
MEASURED AT RF INPUT
-75
-110
-80
-120
-130
1.0E+03
fLO = 1800MHz
1.0E+04
1.0E+05
OFFSET FREQUENCY (Hz)
1.0E+06
-85
-90
925
1175 1425 1675 1925 2175
LO FREQUENCY (MHz)
VCO: KV vs. VTUNE
450
400
350
SUB-BAND 23
300
250
200
SUB-BAND 12
150
100
50 SUB-BAND 0
0
0 0.5 1.0 1.5 2.0 2.5 3.0
VTUNE (V)
6 _______________________________________________________________________________________
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