19-1382; Rev 0; 9/98 MAX2673 Evaluation Kit Features ♦ +2.7V to +5.5V Single Supply 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. ♦ Includes All Critical Peripheral Components ♦ Output Matched for 50Ω at 900MHz ♦ Optimal Component Placement ♦ Easy Evaluation of All Product Functions Ordering Information Component List DESIGNATION PART TEMP. RANGE IC PACKAGE MAX2673EVKIT -40°C to +85°C 8 µMAX QTY DESCRIPTION 3 220pF, ±10%, NP0 ceramic capacitors (0603) C2, C3, C6, C9 4 47pF, ±10%, NP0 ceramic capacitors (0603) C5 1 1.5pF, ±0.25pF, NP0 ceramic capacitor (0603) C7 1 10µF, 6.3V, ±20% A-size tantalum capacitor C10 1 22pF, ±10%, NP0 ceramic capacitor (0603) J1, J2, J3 3 SMA connectors • Digital multimeters to monitor supply voltage and supply current, if desired SHDN 1 3-pin header (0.025" sq., 0.10" centers) • Two HP8648C RF generators for the IFIN and LO inputs or equivalent sine-wave sources L1 1 27nH inductor L2 1 18nH inductor R2 1 100Ω, 5% resistor (0603) T1 1 RF transformer Mini-Circuits TO-75 U1 1 MAX2673EUA C1, C4, C8 The MAX2673 EV kit is fully assembled and factory tested. Follow the instructions in the Connections and Setup section. Test Equipment Required • DC power supply capable of supplying +2.7V to +5.5V at a minimum of 50mA • HP8561E spectrum analyzer or equivalent high-sensitivity spectrum analyzer Connections and Setup • Component Suppliers SUPPLIER _________________________Quick Start PHONE FAX AVX 803-946-0690 803-626-3123 Mini-Circuits 800-654-7949 718-332-4661 Toko 847-297-0700 847-699-7864 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. ________________________________________________________________ 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. Evaluates: MAX2673 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 50Ω impedance of test equipment. Evaluates: MAX2673 MAX2673 Evaluation Kit 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. Table 1. Nominal DC Voltages PIN NUMBER PIN NAME NOMINAL DC VOLTAGE (VCC - 0.4V) to (VCC - 1.0V) 1 LO 2, 6 GND 0 3 SHDN VCC for normal operation 4 VCC 5 RF OUT 7 IFIN- +1.37V 8 IFIN+ +1.37V +2.7V to +5.5V VCC 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. 2 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 10µF 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. 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. Table 2. Output Matching Components vs. RF Output Frequency REFERENCE DESIGNATOR RF OUTPUT FREQUENCY 400MHz 900MHz 1900MHz 2450MHz L1 Short 27nH 5.6nH L2 39nH 18nH 4.7nH 6.8nH C4 3300pF 220pF 100pF 220pF C5 6.8pF 1.5pF 1.5pF 1pF C2, C3, C6, C9 470pF 47pF 47pF 47pF _______________________________________________________________________________________ 3.9nH MAX2673 Evaluation Kit C7 CAPAVX 10µF 16V Evaluates: MAX2673 VCC VCC C8 220pF GND C1 220pF J6 1 SMA LO 2 VCC 1 GND MAX2673 IFIN- T1 1 8 U1 LO SHDN IFIN+ 3 J7 IF IN C10 22pF 7 SMA 2 4 3 2 R2 100Ω C3 47pF VCC C9 47pF 3 SHDN 4 VCC GND1 RF 6 5 C2 47pF C4 220pF L1 27nH J8 C5 1.5pF SMA RF L2 18nH VCC C6 47pF Figure 1. MAX2673 EV Kit Schematic _______________________________________________________________________________________ 3 Evaluates: MAX2673 MAX2673 Evaluation Kit 1.0" Figure 2. MAX2673 EV Kit PC Board Layout—Component Side 4 _______________________________________________________________________________________ MAX2673 Evaluation Kit Evaluates: MAX2673 1.0" 1.0" Figure 3. MAX2673 EV Kit PC Board Layout—Component Side Figure 4. MAX2673 EV Kit PC Board Layout—Solder Side _______________________________________________________________________________________ 5 Evaluates: MAX2673 MAX2673 Evaluation Kit 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 © 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.