Complete Direct-Conversion L-Band Tuner
Typical Operating Characteristics
(MAX2121 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, unless otherwise noted.)
STANDBY SUPPLY CURRENT
175
SUPPLY CURRENT vs. SUPPLY VOLTAGE
3.0
vs. SUPPLY VOLTAGE
-10
HD3 vs. V OUT
170
165
160
T A = +85°C
2.5
-15
-20
-25
155
150
145
T A = +25°C
2.0
T A = +85°C
-30
-35
-40
140
135
T A = -40°C
1.5
T A = -40°C
-45
-50
130
-55
125
1.0
-60
3.1
3.2
3.3
3.4
3.5
3.1
3.2
3.3
3.4
3.5
1.0
1.5
2.0
2.5
3.0
SUPPLY VOLTAGE (V)
QUADRATURE PHASE ERROR
vs. LO FREQUENCY
SUPPLY VOLTAGE (V)
QUADRATURE MAGNITUDE MATCHING
vs. LO FREQUENCY
V OUT (V P-P )
QUADRATURE PHASE ERROR
vs. BASEBAND FREQUENCY
3.5
f BASEBAND = 50MHz
1.0
f BASEBAND = 50MHz
3.5
f LO = 1425MHz
3.0
2.5
0.8
3.0
2.5
T A = -40°C
2.0
1.5
T A = -40°C
0.6
0.4
T A = +25°C
2.0
1.5
T A = +85°C
T A = +25°C
1.0
0.5
T A = +25°C
T A = +85°C
0.2
T A = +85°C
T A = -40°C
1.0
0.5
0
0
0
900
1150
1400
1650
1900
2150
900
1150
1400
1650
1900
2150
0.1
1
10
100
LO FREQUENCY (MHz)
QUADRATURE MAGNITUDE MATCHING
vs. BASEBAND FREQUENCY
LO FREQUENCY (MHz)
BASEBAND FILTER FREQUENCY RESPONSE
BASEBAND FREQUENCY (MHz)
BASEBAND FILTER FREQUENCY RESPONSE
1.0
0.8
0.6
f LO = 1425MHz
T A = +25°C
0
-5
-10
-15
-20
-25
-30
1
0
-1
-2
-3
-4
0.4
-35
-40
-5
-6
T A = +25°C
0.2
T A = +85°C
-45
-50
-55
-7
-8
0
T A = -40°C
-60
-65
-9
-10
0.1
1
10
100
0
100
200
300
400
500
0
25
50
75
100
125
150
BASEBAND FREQUENCY (MHz)
BASEBAND FREQUENCY (MHz)
BASEBAND FREQUENCY (MHz)
5
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