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19-1382; Rev 0; 9/98
MAX2673 Evaluation Kit
General Description
The MAX2673 evaluation kit (EV kit) simplifies evalua-
tion of the MAX2673 upconverter mixer and enables
testing of all functions, with no additional support cir-
cuitry. Signal inputs and outputs use SMA connectors
and are compatible with the 50Ω impedance of test
equipment.
Each EV kit is shipped with a MAX2673 configured for
operation with an IF input frequency of 40MHz to
500MHz, and LO input frequency of 600MHz to
2400MHz. The output matching network is optimized for
an RF output frequency of 900MHz.
o
+2.7V to +5.5V Single Supply
o
Output Matched for 50Ω at 900MHz
o
Optimal Component Placement
o
Easy Evaluation of All Product Functions
o
Includes All Critical Peripheral Components
Features
Evaluates: MAX2673
Ordering Information
PART
TEMP. RANGE
-40°C to +85°C
IC PACKAGE
8 µMAX
MAX2673EVKIT
Component List
DESIGNATION
C1, C4, C8
C2, C3,
C6, C9
C5
C7
C10
J1, J2, J3
SHDN
L1
L2
R2
T1
U1
QTY
3
4
1
1
1
3
1
1
1
1
1
1
DESCRIPTION
220pF, ±10%, NP0 ceramic capaci-
tors (0603)
47pF, ±10%, NP0 ceramic capaci-
tors (0603)
1.5pF, ±0.25pF, NP0 ceramic
capacitor (0603)
10µF, 6.3V, ±20% A-size tantalum
capacitor
22pF, ±10%, NP0 ceramic capacitor
(0603)
SMA connectors
3-pin header (0.025" sq., 0.10" cen-
ters)
27nH inductor
18nH inductor
100Ω, 5% resistor (0603)
RF transformer
Mini-Circuits TO-75
MAX2673EUA
_________________________Quick Start
The MAX2673 EV kit is fully assembled and factory test-
ed. Follow the instructions in the
Connections and
Setup
section.
•
DC power supply capable of supplying +2.7V to
+5.5V at a minimum of 50mA
•
HP8561E spectrum analyzer or equivalent high-sen-
sitivity spectrum analyzer
•
Digital multimeters to monitor supply voltage and
supply current, if desired
•
Two HP8648C RF generators for the IFIN and LO
inputs or equivalent sine-wave sources
Test Equipment Required
Connections and Setup
•
Verify the DC power supply is set to less than +5.5V
before attaching the supply to the EV kit. A good
starting voltage is +3.0V. Connect the power supply
to the EV kit, and turn the power supply on.
2) Verify the
SHDN
jumper is connected to V
CC
, pin 1
shorted to pin 2.
3) Connect a signal generator to the IFIN connector
using an SMA cable. As with any precision RF con-
nector, care should be exercised while threading
the connector. For optimal performance, consult the
connector manufacturer’s specifications for torque
recommendation. Set the generator’s output to
70MHz at -30dBm power level.
4) Connect a second signal generator to the LO input
connector using an SMA cable. Set the generator’s
output to 970MHz at -10dBm power level.
Component Suppliers
SUPPLIER
AVX
Mini-Circuits
Toko
PHONE
803-946-0690
800-654-7949
847-297-0700
FAX
803-626-3123
718-332-4661
847-699-7864
________________________________________________________________
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 408-737-7600 ext. 3468.
MAX2673 Evaluation Kit
Evaluates: MAX2673
5) Connect the RF output of the EV kit to the spectrum
analyzer using an SMA cable. Take care to use
quality connector adapters for the spectrum analyz-
er’s input. Avoid the use of BNC-type connectors
due to their high VSWR while operating in the GHz
range.
6) To assist in troubleshooting, verify the correct DC
voltages on the PC board with a multimeter. Use
Table 1 to verify correct node voltage during proper
operation.
Detailed Description
Figure 1 is the schematic for the EV kit as shipped. The
output matching components (L1, L2, C4, and C5) are
optimized for an output frequency of 900MHz.
Capacitor C1 is a DC-blocking capacitor for the LO
input port. To reduce the possibility of noise pickup,
resistor R2 and capacitor C9 form a lowpass filter at the
SHDN
pin.
Capacitors C2, C3, C6, C7, and C8 form the V
CC
decoupling network. Note the location of each compo-
nent. Capacitor C7, a 10µF tantalum type, is located
near the V
CC
input test point. This serves as the central
node for distribution of V
CC
to the mixer’s supply pin
and the output pull-up inductor L2. Both of these sup-
ply points need separate bypass capacitors as well as
separate traces on the PCB. This is prudent practice to
curtail crosstalk in high-frequency systems.
Table 1. Nominal DC Voltages
PIN NUMBER
1
2, 6
3
4
5
7
8
PIN NAME
LO
GND
SHDN
V
CC
RF OUT
IFIN-
IFIN+
NOMINAL DC
VOLTAGE
(V
CC
- 0.4V) to (V
CC
- 1.0V)
0
V
CC
for normal operation
+2.7V to +5.5V
V
CC
+1.37V
+1.37V
Modifying the EV Kit
The MAX2673 EV kit is easily used at output frequen-
cies from 400MHz to 2500MHz. To operate at frequen-
cies other than the factory configuration of 900MHz,
refer to Table 2 for the required component values.
Analysis
1) Set the spectrum analyzer’s center frequency to
900MHz, with a span of 30MHz.
2) Set the marker position to the peak level.
3) Read the output power of the center frequency. This
should be nominally -18dBm ±1.3dBm. The output
frequency is equal to the algebraic difference of the
LO and IF frequencies. The power is equal to the
IFIN input power, plus the conversion gain of the
upconverter mixer. The MAX2673 has a typical con-
version gain of 12dB.
Table 2. Output Matching Components
vs. RF Output Frequency
REFERENCE
DESIGNATOR
L1
L2
C4
C5
C2, C3, C6, C9
RF OUTPUT FREQUENCY
400MHz
Short
39nH
3300pF
6.8pF
470pF
900MHz
27nH
18nH
220pF
1.5pF
47pF
1900MHz 2450MHz
5.6nH
4.7nH
100pF
1.5pF
47pF
3.9nH
6.8nH
220pF
1pF
47pF
2
_______________________________________________________________________________________
MAX2673 Evaluation Kit
Evaluates: MAX2673
V
CC
C7
CAPAVX
10µF
16V
V
CC
C8
220pF
GND
J6
SMA
C1
220pF
1
LO
IFIN+
8
C10
22pF
1
T1
3
J7
SMA
LO
2
V
CC
1
SHDN
2
3
SHDN
3
GND
U1
MAX2673
IFIN-
7
IF IN
2
4
GND1
6
R2
100Ω
C3
47pF
C9
47pF
V
CC
C2
47pF
4
V
CC
RF
5
C4
220pF
L1
27nH
L2
18nH
V
CC
C6
47pF
C5
1.5pF
J8
SMA
RF
Figure 1. MAX2673 EV Kit Schematic
_______________________________________________________________________________________
3
MAX2673 Evaluation Kit
Evaluates: MAX2673
1.0"
Figure 2. MAX2673 EV Kit PC Board Layout—Component Side
4
_______________________________________________________________________________________
MAX2673 Evaluation Kit
Evaluates: MAX2673
1.0"
Figure 3. MAX2673 EV Kit PC Board Layout—Component Side
1.0"
Figure 4. MAX2673 EV Kit PC Board Layout—Solder Side
_______________________________________________________________________________________
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