4 0 0 MHz t o 2 .5 GHz, Lo w -No is e ,
S iGe Do w n c o n ve rt e r Mix e rs
Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(Typical Operating Circuit, V = SHDN = +3.0V, P
= -25dBm, P = -5dBm, T = +25°C, unless otherwise noted.)
LO A
CC
RFIN
MAX2680
MAX2681
MAX2682
INPUT IP3 vs. LO POWER
INPUT IP3 vs. LO POWER
INPUT IP3 vs. LO POWER
-5
2
7
f
= 1950MHz, 1951MHz
= 1880MHz
= 70MHz
RF
f
= 1950MHz, 1951MHz
f = 1880MHz
LO
RF
f
6
5
4
3
2
1
0
LO
-6
-7
1
0
f
IF
f = 70MHz
IF
P
= -25dBm PER TONE
RFIN
P
= -25dBm PER TONE
RFIN
-8
-1
-2
-3
f
= 1950MHz, 1951MHz
f = 1880MHz
LO
= 70MHz
RF
-9
f
IF
P
= -25dBm PER TONE
RFIN
-10
-14 -12 -10
-8
-6
-4
-2
0
-14 -12 -10
-8
-6
-4
-2
0
-14 -12 -10
-8
-6
-4
-2
0
LO POWER (dBm)
LO POWER (dBm)
LO POWER (dBm)
MAX2680
MAX2681
MAX2682
NOISE FIGURE vs. LO POWER
NOISE FIGURE vs. LO POWER
NOISE FIGURE vs. LO POWER
16
14
20
25
f
RF
f
LO
f
IF
18
16
14
12
10
8
900MHz 970MHz 70MHz
1950MHz 2020MHz 70MHz
2450MHz 2210MHz 70MHz
f
= 2450MHz
= 1950MHz
RF
20
15
10
5
12
10
8
f
= 2450MHz
= 1950MHz
RF
f
RF
f
RF
f
= 2450MHz
f = 1950MHz
RF
RF
01/MAX682
f
RF
= 900MHz
f
RF
= 900MHz
6
6
f = 900MHz
RF
f
RF
f
LO
f
IF
f
f
LO
f
IF
4
RF
900MHz 970MHz 70MHz
1950MHz 2020MHz 70MHz
2450MHz 2210MHz 70MHz
4
900MHz 970MHz 70MHz
1950MHz 2020MHz 70MHz
2450MHz 2210MHz 70MHz
2
2
0
0
0
-14 -12 -10
-8
-6
-4
-2
0
-14 -12 -10
-8
-6
-4
-2
0
-14 -12 -10
-8
-6
-4
-2
0
LO POWER (dBm)
LO POWER (dBm)
LO POWER (dBm)
MAX2680
MAX2681
MAX2682
RF PORT IMPEDANCE vs. RF FREQUENCY
RF PORT IMPEDANCE vs. RF FREQUENCY
RF PORT IMPEDANCE vs. RF FREQUENCY
MAX2680/1/2-19
MAX2680/1/2-20
MAX2680/1/2-21
0
0
300
300
0
300
IMAGINARY
IMAGINARY
IMAGINARY
-100
-200
-300
-400
-500
-600
-100
-200
-300
-400
-500
-600
250
200
150
100
50
250
200
150
100
50
-100
-200
-300
-400
-500
-600
250
200
150
100
50
REAL
REAL
REAL
f
P
= 970MHz
= -5dBm
f
P
= 970MHz
= -5dBm
LO
LO
f
P
= 970MHz
LO
LO
LO
= -5dBm
LO
0
0
0
0
500
1000
1500
2000
2500
0
500
1000
1500
2000
2500
0
500
1000
1500
2000
2500
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
6
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