
Low-Noise, 2.5GHz
Downconverter Mixer
__________________________________________Typical Operating Characteristics
(MAX2690 EV kit, V CC = +3.0V, P LO = -3dBm, P RF = -25dBm, f RF = 1.95GHz, f IF = 200MHz, SHDN = high, T A = +25°C, unless
otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
CONVERSION GAIN
vs. IF FREQUENCY
25
23
21
19
T A = +25°C
T A = -40°C
1.6
1.4
1.2
SHDN = 0V
T A = +85°C
T A = +25°C
6.0
5.8
5.6
5.4
f RF = 2.45GHz
17
1.0
5.2
15
13
T A = +85°C
0.8
0.6
T A = -40°C
5.0
4.8
11
4.6
9
7
5
0.4
0.2
0
4.4
4.2
4.0
2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4 5.7
2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4 5.7
50
100
150
200
250
300
350
SUPPLY VOLTAGE (V)
CONVERSION GAIN
SUPPLY VOLTAGE (V)
NOISE FIGURE
IF FREQUENCY (MHz)
RF PORT IMPEDANCE
10
vs. RF FREQUENCY
14
vs. RF FREQUENCY AND TEMPERATURE
140
vs. FREQUENCY
MAX2690toc06
0
8
f IF = 200MHz
12
120
-50
6
10
T A = +85°C
100
-100
4
2
f IF = 200MH z
8
T A = +25°C
T A = -40°C
80
IMAGINARY
-150
0
-2
-4
f IF = 350MHz
6
4
2
f RF
(MHz)
900
1950
2450
f IF
(MHz)
200
200
350
60
40
20
REAL
-200
-250
-300
-6
0
0
-350
0
500
1000
1500
2000
2500
3000
500
1000
1500
2000
2500
3000
500
1000
1500
2000
2500
10
RF FREQUENCY (MHz)
CONVERSION GAIN
vs. LO POWER
14
RF FREQUENCY (MHz)
GAIN AND LINEARITY
vs. LGND INDUCTOR VALUE
10
FREQUENCY (MHz)
LO PORT S11 vs. FREQUENCY
8
6
f RF = 900MHz, f IF = 200MHz
12
10
OIP3
f RF = 1.95GHz
0
4
8
IIP3
GAIN
-10
2
f RF = 1950MHz, f IF = 200MHz
6
-20
0
-2
-4
-6
f RF = 2450MHz, f IF = 350MHz
4
2
0
-30
-40
-50
-15 -13 -11 -9
-7
-5
-3
-1
1
3
5
0
12
27
47
0
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
LO POWER (dBm)
LGND INDUCTOR VALUE (nH)
FREQUENCY (GHz)
4
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