Rainbow Electronics MAX2042 User Manual
Page 25
SiGe High-Linearity, 2000MHz to 3000MHz
Upconversion/Downconversion Mixer with LO Buffer
MAX2042
______________________________________________________________________________________ 25
Table 1. Downconverter Mode Component Values
Table 2. Upconverter Mode Component Values
Layout Considerations
A properly designed PCB is an essential part of any
RF/microwave circuit. Keep RF signal lines as short as
possible to reduce losses, radiation, and inductance.
For the best performance, 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. The MAX2042 evaluation
kit can be used as a reference for board layout. Gerber
files are available upon request at
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 Tables 1 and 2.
Exposed Pad RF/Thermal Considerations
The exposed pad (EP) of the MAX2042’s 20-pin thin QFN
package provides a low thermal-resistance path to the
die. It is important that the PCB on which the MAX2042
is mounted be designed to conduct heat from the EP. In
addition, provide the EP with a low-inductance path to
electrical ground. The EP MUST be soldered to a ground
plane on the PCB, either directly or through an array of
plated via holes.
DESIGNATION
QTY
DESCRIPTION
COMPONENT SUPPLIER
C1
1
8.2pF microwave capacitor (0402)
Murata Electronics North America, Inc.
C2, C6, C8, C11
4
0.01FF microwave capacitors (0402)
Murata Electronics North America, Inc.
C3, C9
0
Not installed, capacitors
—
C5
0
Not installed, capacitor
—
C10
1
2pF microwave capacitor (0402)
Murata Electronics North America, Inc.
R1
1
698I Q1% resistor (0402)
Digi-Key Corp.
T1
1
1:1 IF balun MABAES0029
M/A-Com, Inc.
U1
1
MAX2042 IC (20 TQFN)
Maxim Integrated Products, Inc.
DESIGNATION
QTY
DESCRIPTION
COMPONENT SUPPLIER
C1
1
8.2pF microwave capacitor (0402)
Murata Electronics North America, Inc.
C2, C6, C8, C11
4
0.01FF microwave capacitors (0402)
Murata Electronics North America, Inc.
C3, C9
0
Not installed, capacitors
—
C5
0
Not installed, capacitor
—
C10
1
2pF microwave capacitor (0402)
Murata Electronics North America, Inc.
R1
1
698I Q1% resistor (0402)
Digi-Key Corp.
T1
1
1:1 IF balun MABAES0029
M/A-Com, Inc.
U1
1
MAX2042 IC (20 TQFN)
Maxim Integrated Products, Inc.