Evaluate: MAX2472/MAX2473
MAX2472/MAX2473 Evaluation Kits
2 _______________________________________________________________________________________
_________________________Quick Start
The MAX2472/MAX2473 EV kits are fully assembled
and factory tested. Follow the instructions in the
Connections and Setup
section for proper device eval-
uation.
Test Equipment Required
This section lists the test equipment recommended to
verify operation of the MAX2472/MAX2473. It is intend-
ed as a guide only, and some substitutions are possi-
ble.
• DC power supply capable of supplying a minimum
of 10mA at +2.7V to +5.5V
• RF spectrum analyzer capable of making measure-
ments over the bandwidth of the MAX2472/MAX2473
as well as a few harmonics (if desired), such as the
6GHz HP8561E
• RF signal generator capable of delivering 0dBm out-
put power from 500MHz to 2500MHz, such as the
HP8648C signal generator
• 50Ω SMA termination
• Two 50Ω SMA cables
Connections and Setup
1) Verify the DC power supply is set to no more than
+5.5V and is off before connecting the supply to the
EV kit. A good starting voltage is +3.0V. Connect the
power supply between V
CC
and GND, then turn on
the power supply.
2) Set the output power of the signal generator to
-20dBm at 900MHz. Disable the generator’s output,
then connect the output of the signal generator to
the IN SMA connector of the MAX2472/MAX2473 EV
kit board. For the MAX2472, terminate OUT2 with a
50Ω termination. For the MAX2473, set the center
jumper at JU1 to set R
BIAS
= 15kΩ.
3) Connect OUT1 to the spectrum analyzer’s RF input.
Analysis
1) Adjust the frequency span, center frequency, and
amplitude of the spectrum analyzer to observe the
signal peak at 900MHz; the output signal power
should read approximately -9dBm. The first harmon-
ic (1800MHz) will be approximately -35dBm
(-25dBc).
_______________Detailed Description
This section describes the circuitry surrounding the IC
in the MAX2472/MAX2473 EV kits. For more detailed
information covering device operation, please consult
the MAX2472/MAX2473 data sheet.
Figure 1 shows the schematic for the MAX2472/
MAX2473 EV kits. Input capacitors C7 and C8 are
100pF DC-blocking capacitors; this value contributes
minimal reactance to the signal paths, down to
500MHz. Capacitors C9 and C10 form the V
CC
decou-
pling network. Note the location of each component; a
relatively large 1µF tantalum capacitor, C10, is located
near the V
CC
connector. Placed near the device, a sub-
stantially smaller 0.01µF decoupling capacitor, C9,
reduces any high-frequency interference. The EV kits
include pad R5 to facilitate simple termination of the
input.
Both the MAX2472 and MAX2473 EV kits feature a bias
and tuning network at OUT1. Capacitors C2 and C3
form an output bias supply decoupling network.
Inductor L1 acts as an RF choke while providing DC
bias and, in conjunction with C1, forms a narrowband
matching network. The EV kits are output matched for
900MHz operation. The MAX2472 has an identical bias-
supply decoupling network and matching network for
OUT2. For the MAX2473, OUT2’s matching network is
replaced with a set of jumpers to allow the selection of
a bias resistor for the BIAS pin. Set the appropriate
jumper at JU1 to select between 11kΩ, 15kΩ, or 23kΩ
(R2, R3, and R4, respectively).
Component Suppliers
SUPPLIER PHONE FAX
Coilcraft 800-322-2645 847-639-1469
E.F. Johnson 402-474-4800 402-474-4858
Murata 770-436-1300 770-436-3030
URL
http://www.
coilcraft.com
http://www.ef
johnson.com
http://www.
murata.com
