MAX2680/MAX2681/
MAX2682
400MHz to 2.5GHz, Low-Noise,
SiGe Downconverter Mixers
Typical Operating Characteristics (continued)
(Typical Operating Circuit, V
= SHDN = +3.0V, P
= -25dBm, P = -5dBm, T = +25°C, unless otherwise noted.)
CC
RFIN LO A
MAX2680
MAX2681
MAX2682
IF PORT IMPEDANCE vs. IF FREQUENCY
IF PORT IMPEDANCE vs. IF FREQUENCY
IF PORT IMPEDANCE vs. IF FREQUENCY
MAX2680/1/2-22
MAX2680/1/2-23
MAX2680/1/2-24
0
0
0
1200
1200
800
f
P
= 970MHz
= -5dBm
f
P
= 970MHz
= -5dBm
LO
LO
f
= 970MHz
P = -5dBm
LO
LO
LO
-50
LO
700
600
-100
-200
-300
-400
-500
-600
-100
-200
-300
-400
-500
-600
1000
800
600
400
200
0
1000
800
600
400
200
0
-100
-150
IMAGINARY
500
400
IMAGINARY
IMAGINARY
-200
-250
-300
-350
-400
300
200
REAL
REAL
REAL
100
0
0
100
200
300
400
500
0
200
0
100
200
300
400
500
0
200
0
100
200
300
400
500
IF FREQUENCY (MHz)
IF FREQUENCY (MHz)
IF FREQUENCY (MHz)
MAX2680
MAX2681
MAX2682
LO PORT RETURN LOSS
LO PORT RETURN LOSS
LO PORT RETURN LOSS
+10
+5
+10
+5
+10
+5
0
0
0
-5
-5
-5
-10
-15
-20
-25
-30
-35
-40
-10
-15
-20
-25
-30
-35
-40
-10
-15
-20
-25
-30
-35
-40
200
760
1320
1880
2440
3000
760
1320
1880
2440
3000
760
1320
1880
2440
3000
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX2680
MAX2681
MAX2682
LO-to-IF AND LO-to-RF ISOLATION
LO-to-IF AND LO-to-RF ISOLATION
LO-to-IF AND LO-to-RF ISOLATION
35
30
25
20
15
10
5
40
35
30
25
35
30
LO-to-IF ISOLATION
LO-to-IF ISOLATION
LO-to-IF ISOLATION
25
20
15
10
LO-to-RF ISOLATION
LO-to-RF ISOLATION
20
15
LO-to-RF ISOLATION
10
5
0
0
0
500
1000
1500
2000
2500
500
1000
1500
2000
2500
500
1000
1500
2000
2500
LO FREQUENCY (MHz)
LO FREQUENCY (MHz)
LO FREQUENCY (MHz)
Maxim Integrated
│ 7
www.maximintegrated.com