Datasheet
MAX9985
Dual, SiGe, High-Linearity, 700MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
9
Maxim Integrated
Typical Operating Characteristics (continued)
(Using the
Typical Application Circuit
, V
CC
= 5.0V, P
LO
= 0dBm, P
RF
= -5dBm, f
RF
> f
LO
, f
IF
= 100MHz, T
C
= +25°C, unless other-
wise noted.)
30
20
25
10
15
5
0
500 800 900600 700 1000 1100 1200
RF PORT RETURN LOSS
vs. RF FREQUENCY
MAX9985 toc37
RF FREQUENCY (MHz)
RF PORT RETURN LOSS (dB)
P
LO
= -3dBm, 0dBm, +3dBm
30
20
25
10
15
5
0
0 200100 300 400 500
IF PORT RETURN LOSS
vs. IF FREQUENCY
MAX9985 toc38
IF FREQUENCY (MHz)
IF PORT RETURN LOSS (dB)
V
CC
= 4.75V, 5.0V, 5.25V
50
40
20
30
10
0
500 700600 800 900 1000 1100 1200
LO SELECTED RETURN LOSS
vs. LO FREQUENCY
MAX9985 toc39
LO FREQUENCY (MHz)
LO SELECTED RETURN LOSS (dB)
P
LO
= +3dBm
P
LO
= 0dBm
P
LO
= -3dBm
50
40
20
30
10
0
500 700600 800 900 1000 1100 1200
LO UNSELECTED RETURN LOSS
vs. LO FREQUENCY
MAX9985 toc40
LO FREQUENCY (MHz)
LO UNSELECTED RETURN LOSS (dB)
P
LO
= -3dBm, 0dBm, +3dBm
360
380
370
400
390
420
410
430
-35 5 25-15 45 65 85
SUPPLY CURRENT
vs. TEMPERATURE (T
C
)
MAX9985 toc41
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
V
CC
= 5.25V
V
CC
= 5.0V
V
CC
= 4.75V
CONVERSION GAIN vs. RF FREQUENCY
(VARIOUS LO AND IF BUFFER BIAS)
MAX9985 toc42
RF FREQUENCY (MHz)
CONVERSION GAIN (dB)
800 900
6.0
6.5
7.0
5.5
700 1000
1
5
6
4
0
2
3
8, 9
7
SEE TABLE 1 FOR R1, R2, AND I
CC
VALUES.
INPUT IP3 vs. RF FREQUENCY
(VARIOUS LO AND IF BUFFER BIAS)
MAX9985 toc43
RF FREQUENCY (MHz)
INPUT IP3 (dBm)
900800
21
22
23
24
25
26
27
28
29
30
20
700 1000
1
5
6
4
2
0
3
8
9
7
SEE TABLE 1 FOR R1, R2, AND I
CC
VALUES.
2RF-2LO RESPONSE vs. RF FREQUENCY
(VARIOUS LO AND IF BUFFER BIAS)
RF FREQUENCY (MHz)
2RF-2LO RESPONSE (dBc)
900800
65
70
75
80
85
60
700 1000
5
6
2
3
7
0
SEE TABLE 1 FOR R1, R2, AND I
CC
VALUES.
P
RF
= -5dBm
8
MAX9985 toc44
3RF-3LO RESPONSE vs. RF FREQUENCY
(VARIOUS LO AND IF BUFFER BIAS)
MAX9985 toc45
RF FREQUENCY (MHz)
3RF-3LO RESPONSE (dBc)
900800
60
65
70
75
80
85
90
55
700 1000
5
0
4
2
3
7
1
SEE TABLE 1 FOR R1, R2, AND I
CC
VALUES.
P
RF
= -5dBm
6
8
9