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MAX2769
Universal GPS Receiver
Typical Operating Characteristics (continued)
(MAX2769 EV kit, V CC = 2.7V to 3.3V, T A = -40 ° C to +85 ° C, PGM = GND. Registers are set to the default power-up states. LNA input
is driven from a 50 Ω source. All RF measurements are done in the analog output mode with ADC bypassed. PGA gain is set to 51dB
gain by serial-interface word GAININ = 111010. Maximum IF output load is not to exceed 10k Ω || 7.5pF on each pin. Typical values
are at V CC = 2.85V and T A = +25 ° C, unless otherwise noted.)
MIXER INPUT REFERRED NOISE FIGURE
1dB CASCADED NOISE FIGURE DESENSITIZATION vs. JAMMER FREQUENCY
vs. PGA GAIN
0
-5
MAX2769 toc12a
MAX2769 toc12b
16
14
12
-10
10
-15
8
-20
6
800
825
850
875
900
925
950
1800
1850
1900
1950
2000
2050
2100
5
15
25
35
45
55
65
JAMMER FREQUENCY (MHz)
PGA GAIN (dB)
3RD-ORDER POLYPHASE FILTER MAGNITUDE
RESPONSE vs. BASEBAND FREQUENCY
10
0
-10
-20
-30
-40
-50
-60
5TH-ORDER POLYPHASE FILTER MAGNITUDE
RESPONSE vs. BASEBAND FREQUENCY
10
0
-10
-20
-30
-40
-50
-60
-70
100
80
60
40
20
MIXER INPUT REFERRED GAIN
vs. PGA GAIN CODE
T A = -40°C
T A = +25°C
T A = +85°C
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
0 5 10 15 20 25 30 35 40 45 50 55 60 65
BASEBAND FREQUENCY (MHz)
Maxim Integrated
BASEBAND FREQUENCY (MHz)
PGA GAIN CODE (DECIMAL FORMAT)
7
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