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19-1382; Rev 0; 9/98
MAX2673 Evaluation Kit
General Description
The MAX2673 evaluation kit (EV kit) simplifies evaluation of the MAX2673 upconverter mixer and enables testing of all functions, with no additional support circuitry. Signal inputs and outputs use SMA connectors and are compatible with the 50 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 50 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 -40C to +85C IC PACKAGE 8 MAX 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 capacitors (0603) 47pF, 10%, NP0 ceramic capacitors (0603) 1.5pF, 0.25pF, NP0 ceramic capacitor (0603) 10F, 6.3V, 20% A-size tantalum capacitor 22pF, 10%, NP0 ceramic capacitor (0603) SMA connectors 3-pin header (0.025" sq., 0.10" centers) 27nH inductor 18nH inductor 100, 5% resistor (0603) RF transformer Mini-Circuits TO-75 MAX2673EUA
_________________________Quick Start
The MAX2673 EV kit is fully assembled and factory tested. 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
Test Equipment Required
* HP8561E spectrum analyzer or equivalent high-sensitivity 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
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 VCC, pin 1 shorted to pin 2. 3) Connect a signal generator to the IFIN connector using an SMA cable. As with any precision RF connector, 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 analyzer'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 component. Capacitor C7, a 10F tantalum type, is located near the VCC input test point. This serves as the central node for distribution of VCC to the mixer's supply pin and the output pull-up inductor L2. Both of these supply 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 VCC RF OUT IFINIFIN+ NOMINAL DC VOLTAGE (VCC - 0.4V) to (VCC - 1.0V) 0 VCC for normal operation +2.7V to +5.5V VCC +1.37V +1.37V
Modifying the EV Kit
The MAX2673 EV kit is easily used at output frequencies from 400MHz to 2500MHz. To operate at frequencies 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 conversion 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
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MAX2673 Evaluation Kit Evaluates: MAX2673
VCC
C7 CAPAVX 10F 16V
VCC C8 220pF
GND
J6 SMA
C1 220pF 1 LO IFIN+ 8 C10 22pF
1
T1
3
J7
SMA
LO
2 VCC 1 SHDN 2 3 SHDN 3 GND
U1 MAX2673
IFIN7
IF IN
2 4
GND1
6
R2 100 C3 47pF C9 47pF
VCC C2 47pF
4
VCC
RF
5 C4 220pF L1 27nH L2 18nH VCC C6 47pF C5 1.5pF
J8
SMA
RF
Figure 1. MAX2673 EV Kit Schematic
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MAX2673 Evaluation Kit Evaluates: MAX2673
1.0"
Figure 2. MAX2673 EV Kit PC Board Layout--Component Side
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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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MAX2673 Evaluation Kit Evaluates: MAX2673
NOTES
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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