MAX9985 Maxim Integrated Products, MAX9985 Datasheet - Page 10

• Manufacturer Part Number: MAX9985
• Description: Downconversion Mixer
• Manufacturer: Maxim Integrated Products

Dual, SiGe, High-Linearity, 700MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
10
10
(Using the Typical Application Circuit , V
wise noted.)
18
17
16
15
14
13
12
11
10
9
8
______________________________________________________________________________________
______________________________________________________________________________________
700
SEE TABLE 1 FOR R1, R2, AND I
(VARIOUS LO AND IF BUFFER BIAS)
INPUT P
RF FREQUENCY (MHz)
1dB
800
vs. RF FREQUENCY
7, 8, 9
1, 2, 3
4, 5, 6
900
CC
0
VALUES.
1000
CC
= 5.0V, P
-10
-15
-20
-25
-30
-35
-40
Typical Operating Characteristics (continued)
LO LEAKAGE AT IF PORT vs. LO FREQUENCY
600
LO
L = 30nH
= 0dBm, P
(VARIOUS VALUES OF L3 AND L6)
650
LO FREQUENCY (MHz)
700
L = 15nH
0Ω
RF
750
= -5dBm, f
Table 1. DC Current vs. Bias Resistor
Settings
L = 7.5nH
CONDITION
800
BIAS
0
1
2
3
4
5
6
7
8
9
850
RF
> f
900
DC CURRENT
LO
, f
397.8
345.0
316.5
297.5
301.2
271.7
252.2
260.1
230.5
211.5
IF
(mA)
= 100MHz, T
70
60
50
40
30
20
700
RF-TO-IF ISOLATION vs. RF FREQUENCY
(VARIOUS VALUES OF L3 AND L6)
VALUES (Ω)
R1 AND R4
C
1070
1400
1400
1400
1910
1910
1910
2800
2800
2800
= +25°C, unless other-
L = 30nH
RF FREQUENCY (MHz)
L = 15nH
800
L = 7.5nH
0Ω
VALUES (Ω)
R2 AND R5
900
1100
1100
1620
2210
1100
1620
2210
1100
1620
2210
1000