Datasheet

MAX9985
Dual, SiGe, High-Linearity, 700MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
10
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.)
INPUT P
1dB
vs. RF FREQUENCY
(VARIOUS LO AND IF BUFFER BIAS)
MAX9985 toc46
RF FREQUENCY (MHz)
INPUT P
1dB
(dBm)
900800
8
9
10
11
12
13
14
15
16
17
18
700 1000
1, 2, 3
4, 5, 6
7, 8, 9
SEE TABLE 1 FOR R1, R2, AND I
CC
VALUES.
0
LO LEAKAGE AT IF PORT vs. LO FREQUENCY
(VARIOUS VALUES OF L3 AND L6)
MAX9985 toc47
LO FREQUENCY (MHz)
LO LEAKAGE AT IF PORT (dBm)
850800750700650
-35
-30
-25
-20
-15
-10
-40
600 900
0Ω
L = 7.5nH
L = 30nH
L = 15nH
RF-TO-IF ISOLATION vs. RF FREQUENCY
(VARIOUS VALUES OF L3 AND L6)
MAX9985 toc48
RF FREQUENCY (MHz)
RF-TO-IF ISOLATION (dB)
900800
30
40
50
60
70
20
700 1000
L = 15nH
L = 30nH
L = 7.5nH
0Ω
Table 1. DC Current vs. Bias Resistor
Settings
BIAS
CONDITION
DC CURRENT
(mA)
R1 AND R4
VALUES (Ω)
R2 AND R5
VALUES (Ω)
0 397.8 1070 1100
1 345.0 1400 1100
2 316.5 1400 1620
3 297.5 1400 2210
4 301.2 1910 1100
5 271.7 1910 1620
6 252.2 1910 2210
7 260.1 2800 1100
8 230.5 2800 1620
9 211.5 2800 2210