Datasheet

Table 1. DC Current vs. Bias Resistor
Settings
MAX19985A
Dual, SiGe, High-Linearity, 700MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
______________________________________________________________________________________ 17
RF PORT RETURN LOSS
vs. RF FREQUENCY
MAX19985A toc89
RF FREQUENCY (MHz)
RF PORT RETURN LOSS (dB)
900750 850 950800
5
20
10
25
15
0
30
700 1000
P
LO
= -3dBm, 0dBm, +3dBm
IF = 200MHz
V
CC
= 3.3V
IF PORT RETURN LOSS
vs. IF FREQUENCY
MAX19985A toc90
IF FREQUENCY (MHz)
IF PORT RETURN LOSS (dB)
140 230 410
5
20
10
25
15
0
30
50 500320
LO = 900MHz
V
CC
= 3.0V, 3.3V, 3.6V
IF RETURN LOSS DEPENDS ON
EXTERNAL COMPONENTS
LO SELECTED RETURN LOSS
vs. LO FREQUENCY
MAX19985A toc91
LO FREQUENCY (MHz)
LO SELECTED RETURN LOSS (dB)
1150
30
40
10
20
0
50
700 13001000850
P
LO
= +3dBm
P
LO
= -3dBm
P
LO
= 0dBm
V
CC
= 3.3V
LO UNSELECTED RETURN LOSS
vs. LO FREQUENCY
MAX19985A toc92
LO FREQUENCY (MHz)
LO UNSELECTED RETURN LOSS (dB)
1150
30
40
10
20
0
50
700 13001000850
P
LO
= -3dBm, 0dBm, +3dBm
V
CC
= 3.3V
SUPPLY CURRENT
vs. TEMPERATURE (T
C
)
MAX19985A toc93
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
455
320
280
260
240
220
300
340
200
-35 8525-15 65
V
CC
= 3.6V
V
CC
= 3.0V
V
CC
= 3.3V
Typical Operating Characteristics (continued)
( Typical Application Circuit , V
CC
= +3.3V, P
LO
= 0dBm, P
RF
= -5dBm, LO is high-side injected for a 200MHz IF, T
C
=+25°C, unless
otherwise noted.)
BIAS
CONDITION
D C CU R R EN T
( m A )
R1 AND R4
VALUES (Ω)
R2 AND R5
VALUES (Ω)
1 359.4 698 800
2 331.8 698 1100
3 322.8 698 1200
4 311.7 698 1400
5 268.2 1100 1200
6 244.4 1400 1200
7 223.7 1820 1200
Note: See TOCs 42–46 for performance trade-offs vs. DC bias
condition.