3.5GHz Downconverter Mixers
with Selectable LO Doubler
Typical Operating Characteristics (continued)
(MAX2683/MAX2684 EV kit, V = +5V, R
= 1.2kΩ, ENX2 = GND, f = 3.6GHz, P = -20dBm, f
= 1650MHz for MAX2683 or
CC
BIAS
RF
RF
LOX2
f
= 1350MHz for MAX2684, P = -5dBm, all input/output ports terminated in 50Ω, IFOUT+ and IFOUT- matched to single-ended
LOX2
LO
50Ω load, T = +25°C, unless otherwise noted.)
A
MAX2684
SUPPLY CURRENT vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(ENX2 = GND)
SUPPLY CURRENT vs. R
(ENX2 = V
)
CC
BIAS
100
100
90
80
70
60
50
40
30
20
10
0
70
65
60
55
50
45
40
35
30
25
20
90
T
= +85°C
A
80
70
60
50
40
30
20
10
0
T
= +25°C
ENX2 = GND
A
R
R
= 820Ω
= 1.2kΩ
BIAS
T
= +25°C
T
= +85°C
A
A
V
= +5V
CC
R
R
= 820Ω
= 1.2kΩ
BIAS
BIAS
V
= +5V
CC
BIAS
V
= +3.3V
CC
R
= 2.0kΩ
BIAS
V
= +3.3V
CC
T
= -40°C
A
R
= 2.0kΩ
BIAS
ENX2 = V
CC
T
= -40°C
A
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
800 1000 1200 1400 1600 1800 2000
(Ω)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
R
BIAS
CONVERSION GAIN vs. R
INPUT P1dB vs. R
INPUT IP3 vs. R
BIAS
BIAS
BIAS
1.4
3
2
13
12
11
10
9
V
= +5V
CC
V
= +5V
V
= +5V
CC
CC
1.2
1.0
0.8
0.6
0.4
0.2
0
1
V
= +3.3V
CC
0
-1
-2
-3
-4
V
= +3.3V
V
= +3.3V
CC
CC
8
7
-0.2
6
800 1000 1200 1400 1600 1800 2000
(Ω)
800 1000 1200 1400 1600 1800 2000
(Ω)
800 1000 1200 1400 1600 1800 2000
(Ω)
R
R
BIAS
R
BIAS
BIAS
CONVERSION GAIN vs. LO POWER
(ENX2 = GND)
CONVERSION GAIN vs. LO POWER
(ENX2 = V
)
NOISE FIGURE vs. LO POWER
CC
5
4
5
4
20
19
18
17
16
15
14
13
12
11
10
T
= -40°C
A
T
= -40°C
A
3
3
2
2
T
= +25°C
A
T
= +25°C
A
1
1
0
0
T
= +85°C
A
-1
-2
-3
-4
-5
-1
-2
-3
-4
-5
T
= +85°C
A
-20
-15
-10
-5
0
-20
-15
-10
LO POWER (dBm)
-5
0
-16 -14 -12 -10 -8 -6 -4 -2
LO POWER (dBm)
0
LO POWER (dBm)
8
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