Datasheet
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
MAX2112 toc08
BASEBAND FREQUENCY (MHz)
BASEBAND OUTPUT LEVEL (dB)
1000
-10
-8
-4
-6
-2
0
2
-14
-12
100 10,000
PROGRAMMED f
-3dB
FREQUENCY
vs. MEASURED f
-3dB
FREQUENCY
MAX2112 toc09
PROGRAMMED f
-3dB
FREQUENCY (MHz)
MEASURED f
-3dB
FREQUENCY (MHz)
402015 25 30 35510
5
10
20
15
25
35
30
40
45
0
045
LPF[7:0] = 12 + (f
-3dB
- 4MHz)/290kHz
BASEBAND FILTER 3dB FREQUENCY
vs. TEMPERATURE
TEMPERATURE (°C)
BASEBAND GAIN ERROR AT f
-3dB
(dB)
MAX2112 toc10
-40-200 20406080
-1.0
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1.0
NORMALIZED TO T
A
= +25°C
INPUT POWER vs. V
GC1
V
GC1
(V)
INPUT POWER (dBm)
MAX2112 toc11
0.5 1.0 1.5 2.0 2.5 3.0
-80
-70
-60
-50
-40
-30
-20
-10
0
10
ADJUST BBG[3:0] FOR 1V
P-P
BASEBAND
OUTPUT WITH
P
IN
= -75dBm AND V
GC1
= 0.5V
T
A
= -40°C
T
A
= +85°C
T
A
= +25°C
NOISE FIGURE vs. FREQUENCY
FREQUENCY (MHz)
NOISE FIGURE (dB)
MAX2112 toc12
900 1100 1300 1500 1700 1900 2100 2300
7.5
8.0
8.5
9.0
9.5
10.0
10.5
T
A
= +25°C
T
A
= +85°C
ADJUST BBG[3:0] FOR 1V
P-P
BASEBAND
OUTPUT WITH P
IN
= -75dBm
AND V
GC1
= 0.5V
T
A
= +70°C
NOISE FIGURE vs. INPUT POWER
MAX2112 toc13
INPUT POWER (dBm)
NOISE FIGURE (dB)
-20-30-40-50-60-70
20
10
30
40
50
60
70
0
-80 0-10
ADJUST BBG[3:0] FOR 1V
P-P
BASEBAND OUTPUT WITH
P
IN
= -75dBm AND V
GC1
= 0.5V.
f
LO
= 1500MHz
OUT-OF-BAND IIP3 vs. INPUT POWER
MAX2112 toc14
INPUT POWER (dBm)
OUT-OF-BAND IIP3 (dBm)
-20-30-40-50-60-70
-10
-20
0
10
20
30
-30
-80 0-10
SEE NOTE 4 ON PAGE 4 FOR CONDITIONS
IN-BAND IIP3 vs. INPUT POWER
MAX2112 toc15
INPUT POWER (dBm)
IN-BAND IIP3 (dBm)
-20-30-40-50-60-70
-30
-50
-40
-10
-20
0
10
20
30
-60
-80 0-10
SEE NOTE 3 ON PAGE 4 FOR CONDITIONS
IIP2 vs. INPUT POWER
MAX2112 toc16
INPUT POWER (dBm)
IIP2 (dBm)
-20-30-40-50-60-70
0
10
30
20
40
50
60
-10
-80 0-10
SEE NOTE 5 ON PAGE 4 FOR CONDITIONS
MAX2112
6
Maxim Integrated