Datasheet

MAX2121
Complete Direct-Conversion L-Band Tuner
Typical Operating Characteristics (continued)
(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.)
6
BASEBAND FILTER 3dB FREQUENCY
vs. TEMPERATURE
MAX2121 toc10
TEMPERATURE (°C)
BASEBAND GAIN ERROR AT f-3dB (dB)
8060-20 0 20 40
-0.75
-0.50
-0.25
0
0.25
0.50
0.75
1.00
-1.00
-40
NORMALIZED AT T
A
= +25°C
BASEBAND FILTER HIGHPASS
FREQUENCY RESPONSE
MAX2121 toc11
BASEBAND FREQUENCY (Hz)
BASEBAND OUTPUT LEVEL (dB)
1000
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
-10
100 10,000
VOLTAGE GAIN vs. V
GC1
MAX2121 toc12
V
GC1
(V)
VOLTAGE GAIN (dB)
2.52.00.5 1.0 1.5
10
20
30
40
50
60
70
80
0
0 3.0
BBG[3:0] = 1111
NOISE FIGURE vs. LO FREQUENCY
(T
A
= +25°C)
MAX2121 toc13
LO FREQUENCY (MHz)
NOISE FIGURE (dB)
190016501150 1400
7.5
8.0
8.5
9.0
10.0
9.5
10.5
11.0
7.0
900 2150
ADJUST BBG[3:0] FOR 1V
P-P
BASEBAND
OUTPUT WITH PIN = -75dBm AND V
GC1
= 0.5V
10dB BACKED OFF GAIN
NOISE FIGURE vs. INPUT POWER
MAX2121 toc14
INPUT POWER (dBm)
NOISE FIGURE (dB)
-35-45-55-65
10
15
20
25
30
35
5
-75
ADJUST BBG[3:0] for 1V
P-P
BASEBAND OUTPUT WITH PIN = -75dBm
AND V
GC1
= -0.5V, f
LO
= 1500MHz
OUT-OF-BAND IIP3 vs. INPUT POWER
MAX2121 toc15
INPUT POWER (dBm)
OUT-OF-BAND IIP3 (dBm)
-5-15-25-35-45-55-65
-20
-10
0
10
20
30
-30
-75
SEE NOTE 5 ON PAGE 4 FOR CONDITIONS
IN-BAND IIP3 vs. INPUT POWER
MAX2121 toc16
INPUT POWER (dBm)
IN-BAND IIP3 (dBm)
-5-15-65 -55 -45 -35 -25
-50
-40
-30
-20
-10
0
10
20
-60
-75
SEE NOTE 4 ON PAGE 4 FOR CONDITIONS
IIP2 vs. INPUT POWER
MAX2121 toc17
INPUT POWER (dBm)
IIP2 (dBm)
-5-15-35 -25-55 -45-65
-5
0
5
10
15
20
25
30
35
40
-10
-75
SEE NOTE 6 ON PAGE 4
FOR CONDITIONS
INPUT RETURN LOSS vs. FREQUENCY
MAX2121 toc18
FREQUENCY (MHz)
INPUT RETURN LOSS (dB)
202518001350 15751125
-20
-15
-10
-5
0
-25
900 2250
V
GC1
= 2.7V
V
GC1
= 0.5V