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SiGe, High-Linearity, 2300MHz to 4000MHz
Upconversion/Downconversion Mixer with LO Buffer
Reduced-Power Mode
The MAX2044 has one pin (LOBIAS) that allows an
external resistor to set the internal bias current. Nominal
values for this resistor are shown in Tables 1 and 2.
Larger value resistors can be used to reduce power
dissipation at the expense of some performance loss. If
Q 1% resistors are not readily available, substitute with
Q 5% resistors.
Significant reductions in power consumption can also
be realized by operating the mixer at a supply voltage
of 3.3V. Doing so reduces the overall power consump-
tion by typically 42%. See the 3.3V Supply AC Electrical
Characteristics table and the relevant 3.3V curves in the
Typical Operating Characteristics section to evaluate the
power vs. performance trade-offs.
Layout Considerations
A properly designed PCB is an essential part of any RF/
microwave circuit. Keep RF signal lines as short as pos-
sible to reduce losses, radiation, and inductance. The
load impedance presented to the mixer must be such
that any capacitance from both IF- and IF+ to ground
does not exceed several picofarads. For the best per-
formance, route the ground pin traces directly to the
exposed pad under the package. The PCB exposed pad
MUST be connected to the ground plane of the PCB. It is
suggested that multiple vias be used to connect this pad
to the lower level ground planes. This method provides a
good RF/thermal-conduction path for the device. Solder
the exposed pad on the bottom of the device package
to the PCB.
Power-Supply Bypassing
Proper voltage supply bypassing is essential for high-
frequency circuit stability. Bypass each V CC pin with the
capacitors shown in the Typical Application Circuit and
see Table 1.
Table 1. Downconverter Mode Component Values
DESIGNATION
C1
C2, C6, C8, C11
C3, C9
C4, C7
C5
C10
C12
R1
T1
U1
QTY
1
4
0
2
0
1
1
0
1
1
1
DESCRIPTION
3.3nH microwave inductor (0402). Use for RF
frequencies ranging from 2300MHz to 3000MHz .
8.2pF microwave capacitor (0402). Use for RF
frequencies ranging from 3000MHz to 4000MHz .
0.01 F F microwave capacitors (0402)
Not installed, microwave capacitors (0402)
470pF microwave capacitors (0402)
Not installed, microwave capacitor (0402)
2pF microwave capacitor (0402)
0.3pF microwave capacitor (0402). Use for RF
frequencies ranging from 2300MHz to 3000MHz .
Microwave capacitor (0402) not installed for RF
frequencies ranging from 3000MHz to 4000MHz .
698 I ±1% resistor (0402). Use for V CC = +5.0V
applications.
698 I ±1% resistor (0402). Use for V CC = +3.3V
applications.
1:1 IF balun MABAES0029
MAX2044 IC (20 TQFN)
COMPONENT SUPPLIER
Coilcraft, Inc.
Murata Electronics North America, Inc.
Murata Electronics North America, Inc.
—
Murata Electronics North America, Inc.
—
Murata Electronics North America, Inc.
Murata Electronics North America, Inc.
—
Digi-Key Corp.
Digi-Key Corp.
M/A-Com
Maxim Integrated Products, Inc.
36
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