
MAX2769
Universal GPS Receiver
Typical Operating Characteristics
(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.)
CASCADED RECEIVER GAIN
vs. PGA GAIN CODE
CASCADED GAIN AND NOISE FIGURE
vs. TEMPERATURE
LNA1 |S21| AND |S12|
vs. FREQUENCY
120
2.0
MAX2769 toc02
120
40
30
|S21|
100
T A = -40°C
T A = +25°C
1.5
AGC GAIN
115
110
20
10
80
1.0
NOISE FIGURE
105
0
-10
|S12|
60
T A = +85°C
0.5
100
95
-20
-30
-40
40
0 5 10 15 20 25 30 35 40 45 50 55 60 65
0
-40
-15
10
35
60
85
90
-50
0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50
PGA GAIN CODE (DECIMAL FORMAT)
LNA1 GAIN AND NOISE FIGURE
vs. LNA1 BIAS DIGITAL CODE
TEMPERATURE ( ° C)
LNA1 GAIN AND NOISE FIGURE
vs. TEMPERATURE
FREQUENCY (GHz)
1.6
MAX2769 toc04
25
1.4
LNA BIAS = 1000
MAX2769 toc05
19.6
1.4
1.2
1.0
GAIN
20
15
1.2
1.0
0.8
19.4
19.2
19.0
18.8
0.8
0.6
0.4
0.2
NOISE FIGURE
10
5
0.6
0.4
0.2
NOISE FIGURE
GAIN
18.6
18.4
18.2
18.0
0
0
0
17.8
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
-40
-15
10
35
60
85
Maxim Integrated
LNA BIAS DIGITAL CODE (DECIMAL)
TEMPERATURE ( ° C)
5