Rainbow Electronics MAX2769B - Manual (Page 5)

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MAX2769B
Universal GPS Receiver
Typical Operating Characteristics
(MAX2769B EV kit, V
CC_
= 2.7V to 3.3V, T
A
= -40°C to +85NC, PGM = Ground. Registers are set to the default power-up states. LNA
input is driven from a 50I 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 10kI||7.5pF on each pin. Typical
values are at V
CC_
= 2.85V and T
A
= +25NC, unless otherwise noted.)
CASCADED RECEIVER GAIN
vs. PGA GAIN CODE
MAX2769B toc0
1
PGA GAIN CODE (DECIMAL FORMAT)
CASCADED RECEIVER GAIN (dB)
60 55 50 45 40 35 30 25 20 15 10 5
60
80
100
120
40
0 65
T A = +25°C
T
A
= -40°C
T A = +85°C
CASCADED GAIN AND NOISE FIGURE
vs. TEMPERATURE
MAX2769B toc02
TEMPERATURE (°C)
NOISE FIGURE (dB)
60 35 10 -15
0.5
1.0
1.5
2.0
0
-40 85
CASCADED GAIN
100
105
110
115
120
90
95
AGC GAIN
NOISE FIGURE
LNA1 |S21| AND |S12|
vs. FREQUENCY
MAX2769B toc0
3
FREQUENCY (GHz)
LNA1 |S21| AND |S12| (dB)
2.25 2.00 1.50 1.75 1.00 1.25 0.75
-40
-30
-20
-10
0
10
20
30
40
-50
0.50 2.50
|S21|
|S12|
LNA1 GAIN AND NOISE FIGURE
vs. LNA1 BIAS DIGITAL CODE
MAX2769B toc04
LNA BIAS DIGITAL CODE (DECIMAL)
NOISE FIGURE (dB)
LNA1 GAIN (dB)
14 13 2 3 4 6 7 8 9 10 11 5 12
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
0
5
10
15
20
25
0
1 15
GAIN
NOISE FIGURE
LNA1 GAIN AND NOISE FIGURE
vs. TEMPERATURE
MAX2769B toc05
TEMPERATURE (°C)
NOISE FIGURE (dB)
60 35 10 -15
0.2
0.4
0.6
0.8
1.0
1.2
1.4
0
-40 85
LNA1 GAIN (dB)
18.8
19.0
19.2
19.4
19.6
17.8
18.6
18.4
18.2
18.0
LNA BIAS = 1000
NOISE FIGURE GAIN
LNA1 INPUT 1dB COMPRESSION POINT
vs. LNA1 BIAS DIGITAL CODE
MAX2769B toc0
6
LNA BIAS DIGITAL CODE (DECIMAL)
LNA1 INPUT 1dB COMPRESSION POINT (dBm)
14 13 2 3 4 6 7 8 9 10 11 5 12
-12.5
-10.0
-7.5
-5.0
-2.5
0
2.5
5.0
-15.0
1 15