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.)
LNA1 INPUT 1dB COMPRESSION POINT
vs. LNA1 BIAS DIGITAL CODE
LNA2 |S21| AND |S12|
vs. FREQUENCY
LNA2 GAIN AND NOISE FIGURE
vs. TEMPERATURE
5.0
2.5
30
20
|S21|
2.0
1.8
LNA BIAS = 10
MAX2769 toc08
13.6
13.4
0
10
1.6
1.4
13.2
-2.5
-5.0
0
-10
|S12|
1.2
1.0
13.0
-7.5
-10.0
-12.5
-15.0
-20
-30
-40
-50
0.8
0.6
0.4
0.2
0
NOISE FIGURE
GAIN
12.8
12.6
12.4
12.2
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50
-40
-15
10
35
60
85
LNA BIAS DIGITAL CODE (DECIMAL)
LNA INPUT RETURN LOSS
vs. FREQUENCY
FREQUENCY (GHz)
LNA OUTPUT RETURN LOSS
vs. FREQUENCY
TEMPERATURE ( ° C)
MIXER INPUT REFERRED IP1dB
vs. OFFSET FREQUENCY
0
-10
-20
LNA1
0
-5
LNA1
0
-10
-20
-30
PGA GAIN = 32dB
PGA GAIN = 51dB
-30
LNA2
-10
-40
-50
-60
-40
-15
LNA2
-70
-80
-50
-20
-90
P RF = -100dBm
1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2
1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2
0
50
100
150
200
250
300
6
FREQUENCY (GHz)
FREQUENCY (GHz)
OFFSET FREQUENCY (MHz)
Maxim Integrated
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