19-1466; Rev 0; 6/99
MAX2472/MAX2473 Evaluation Kits
General Description
The MAX2472/MAX2473 evaluation kits (EV kits) simpli-
fy evaluation of the MAX2472/MAX2473 VCO buffers.
They enable performance testing and require no addi-
tional support circuitry. All inputs and outputs use SMA
connectors to facilitate connection of RF test equip-
ment.
The MAX2472 EV kit is assembled with the MAX2472
and provides a high-impedance input and a pair of
open-collector outputs. The EV kit includes a matching
network tuned for 900MHz. The MAX2473 EV kit is
assembled with the MAX2473 and provides a high-
impedance input, a single open-collector output, and a
bias control input for setting the output power. Output
matches for 600MHz, 1900MHz, or 2400MHz are
achieved by replacing the matching components with
values provided in the MAX2472/MAX2473 data sheet.
Features
o
Easy Evaluation of MAX2472/MAX2473
o
+2.7V to +5.5V Single-Supply Operation
o
Variable Bias Control (MAX2473)
o
Single (MAX2473) or Dual (MAX2472) Open-
Collector Outputs
o
All Critical Peripheral Components Included
Evaluate: MAX2472/MAX2473
Ordering Information
PART
TEMP. RANGE
IC
SOT
PACKAGE TOP MARK
SOT23-6
SOT23-6
AAAZ
AABA
MAX2472EVKIT
-40°C to +85°C
MAX2473EVKIT
-40°C to +85°C
MAX2472
Component List
DESIGNATION QTY
C1, C4
C2, C5, C9
C3, C6, C7, C8
C10
L1
Z1
R1–R5
R6, R7
JU1
VCC, GND
IN, OUT1,
OUT2
U1
None
2
3
4
1
1
1
0
2
0
2
3
1
1
DESCRIPTION
1pF ±0.1pF ceramic capacitors
(0603) Murata GRM39COG1R0B50V
0.01µF 5% ceramic capacitors (0603)
Murata GRM39X7R103J50V
100pF 5% ceramic capacitors (0603)
Murata GRM39COG101J50V
1µF 5% ceramic capacitor (0805)
12nH 5% inductor (0603)
Coilcraft 0603HS-12NTJBC
12nH 5% inductor (0603)
Coilcraft 0603HS-12NTJBC
Not installed
0Ω resistors (0603)
Not installed
Test points
SMA connectors (PC edge-mount)
EF Johnson 142-0701-801
MAX2472EUT
(6-pin SOT23, top mark AAAZ)
MAX2472/MAX2473 PC board
MAX2473
Component List
DESIGNATION QTY
C1
C2, C9
C3, C7, C8
C4, C5, C6
C10
L1
Z1
R1, R6
R2
R3
R4
R5, R7
JU1
None
VCC, GND
IN, OUT1
U1
None
1
2
3
0
1
1
1
2
1
1
1
0
1
1
2
2
1
1
DESCRIPTION
1pF ±0.1pF ceramic capacitor (0603)
Murata GRM39COG1R0B50V
0.01µF 5% ceramic capacitors (0603)
Murata GRM39X7R103J50V
100pF 5% ceramic capacitors (0603)
Murata GRM39COG101J50V
Not installed
1µF 5% ceramic capacitor (0805)
12nH 5% inductor (0603)
Coilcraft 0603HS-12NTJBC
0Ω resistor (0603)
0Ω resistors (0603)
11kΩ 5% resistor (0603)
15kΩ 5% resistor (0603)
23kΩ 5% resistor (0603)
Not installed
6-pin header
Shunt (JU1)
Test points
SMA connectors (PC edge-mount)
EF Johnson 142-0701-801
MAX2473EUT
(6-pin SOT23, top mark AABA)
MAX2472/MAX2473 PC board
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAX2472/MAX2473 Evaluation Kits
Evaluate: MAX2472/MAX2473
_________________________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.
_______________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).
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.
Component Suppliers
SUPPLIER
Coilcraft
E.F. Johnson
PHONE
FAX
URL
http://www.
coilcraft.com
http://www.ef
johnson.com
http://www.
murata.com
800-322-2645 847-639-1469
402-474-4800 402-474-4858
770-436-1300 770-436-3030
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).
Murata
2
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