19-1620; Rev 0; 1/00 MAX2683/MAX2684 Evaluation Kits Features ♦ Easy Evaluation of MAX2683/MAX2684 The MAX2683/MAX2684 are downconversion mixers intended for operation in the 3.4GHz to 3.8GHz frequency range. The MAX2683 is optimized for downconversion to IF frequencies between 100MHz and 400MHz, and allows high-side or low-side LO injection. The MAX2684 is optimized for IF frequencies between 800MHz to 1000MHz and only allows low-side LO injection. A logiclevel enabled LO frequency doubler allows the external LO source to run at half frequency, or at full frequency if disabled. As assembled, the MAX2683/MAX2684 EV kits are configured for operation of the LO at half frequency. A few simple component changes configure the EV kit for operation of the LO at full frequency. In addition, an external resistor allows adjustment of device linearity and supply current. ♦ IF Output Matched to 50Ω at 300MHz (MAX2683) ♦ All Critical Peripheral Components Included ♦ SMA Input and Output Signal Connectors ♦ RF Input Matched to 50Ω at 3600MHz ♦ IF Output Matched to 50Ω at 900MHz (MAX2684) ♦ Fully Assembled and Tested Ordering Information PART TEMP. RANGE IC PACKAGE MAX2683EVKIT -40°C to +85°C 16 TSSOP-EP* MAX2684EVKIT -40°C to +85°C 16 TSSOP-EP* *Exposed paddle MAX2683 Component List DESIGNATION QTY DESCRIPTION 1 3300pF ±10% ceramic capacitor (0402) Murata GRM36X7R332K050 or Taiyo Yuden UMK105B332KW 1 1pF ±0.1pF ceramic capacitor (0603) Murata GRM39COG010B050 3 100pF ±5% ceramic capacitors (0603) Murata GRM39COG101J050 or Taiyo Yuden UMK107CH101JZ C4 1 10µF, 10V tantalum capacitor AVX TAJB106M010 C5 0 Not installed 1 1000pF ±10% ceramic capacitor (0603) Murata GRM39X7R102K050 2 8.2pF ±0.25pF ceramic caps (0603) Murata GRM39COG8R2C050 or Taiyo Yuden UMK107CH8R2CZ C10 1 3.3pF ±0.1pF ceramic cap (0603) Murata GRM39COG3R3B050 JU1 1 3-pin header L1 1 1.2nH ±0.2nH inductor (0402) Murata LQP10A1N2C00 C1 C2 C3, C6, C12 C7 C8, C9 DESIGNATION QTY DESCRIPTION L3, L4 2 39nH ±5% inductors (0603) Murata LQG11A39NJ00 L5 1 3.9nH ±3nH inductor (0603) Murata LQG11A3N9S00 R1, R2 2 1.21kΩ ±1% resistors (0603) R3 1 1.50kΩ ±1% resistor (0603) R4 0 Not installed RFIN, LOX, IF 3 SMA connectors (PC edge mount) EFJohnson 142-0701-801 T1 1 Balun transformer, B4F type Toko 617DB-1018 U1 1 MAX2683EUE (16-pin TSSOP) VCC, GND 2 Test points None 1 Shunt (JU1) None 1 MAX2683/MAX2684 PC board None 1 MAX2683/MAX2684 data sheet None 1 MAX2683/MAX2684 EV kit data sheet ________________________________________________________________ Maxim Integrated Products 1 For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. Evaluate: MAX2683/MAX2684 General Description The MAX2683/MAX2684 evaluation kits (EV kits) simplify evaluation of the MAX2683/MAX2684 3.4GHz to 3.8GHz downconverter mixers. The EV kits are fully assembled and tested, allowing simple evaluation of all device functions. All signal ports utilize SMA connectors, providing a convenient interface to RF test equipment. Evaluate: MAX2683/MAX2684 MAX2683/MAX2684 Evaluation Kits MAX2684 Component List DESIGNATION QTY C1 C2 C3, C6, C12 C4 DESIGNATION QTY DESCRIPTION 1 3300pF ±10% ceramic cap (0402) Murata GRM36X7R332K050 or Taiyo Yuden UMK105B332KW 1 1pF ±0.1pF ceramic capacitor (0603) Murata GRM39COG010B050 3 100 pF ±5% ceramic capacitors (0603) Murata GRM39COG101J050 or Taiyo Yuden UMK107CH101JZ 1 10µF, 10V tantalum capacitor AVX TAJB106M010 C5 0 Not installed C7 1 1000pF ±10% ceramic cap (0603) Murata GRM39X7R102K050 C8, C9 2 8.2pF ±0.25pF ceramic caps (0603) Murata GRM39COG8R2C050 or Taiyo Yuden UMK107CH8R2CZ C10 0 Not installed JU1 1 3-pin header L1 1 1.2nH ±0.2nH inductor (0402) Murata LQP10A1N2C00 Component Suppliers SUPPLIER PHONE FAX 843-448-9411 843-448-1943 www. avxcorp.com EFJohnson 402-474-4800 402-474-4858 www. efjohnson.com Murata 800-831-9172 814-238-0490 www. murata.com Taiyo Yuden 800-348-2496 847-925-0899 www. T-Yuden.com Toko 800-PIK-TOKO 708-699-1194 www. tokoam.com Test Equipment Required This section lists the test equipment required for evaluating the MAX2683/MAX2684: L3, L4 2 6.8nH ±5% inductors (0603) Murata LQG11A6N8J00 L5 1 3.9nH ±0.3nH inductor (0603) Murata LQG11A3N9S00 R1, R2 2 1.21kΩ ±1% resistors (0603) R3 1 301Ω ±1% resistor (0603) R4 0 Not installed RFIN, LOX, IF 3 SMA connectors (PC edge mount) EFJohnson 142-0701-801 T1 1 Balun transformer, B4F type Toko 617DB-1018 U1 1 MAX2684EUE (16-pin TSSOP) VCC, GND 2 Test points None 1 Shunt (JU1) None 1 MAX2683/MAX2684 PC board None 1 MAX2683/MAX2684 data sheet None 1 MAX2683/MAX2684 EV kit data sheet • Two low-noise RF-signal generators or equivalent (50Ω) sine-wave sources capable of delivering at least 0dBm of output power up to 4GHz. One generator is required for the RF signal source, while the second generator is required for the LO signal source. • One HP 8561E RF-spectrum analyzer or equivalent that covers the downconverter mixer’s output frequency range, as well as a few harmonics (6GHz). • Three 50Ω SMA cables (RG-58A/U or equivalent). • Optional: digital multimeters (DMMs) to monitor DC supply voltage and supply current. WEB AVX DESCRIPTION Connections and Setup This section provides step-by-step instructions for getting the EV kit up and running: 1) DC Power Supply: Set the power-supply voltage to +5V. Turn the power supply off and connect it to the VCC and GND connections on the EV kit. If desired, place an ammeter in series with the power supply to measure supply current and a voltmeter in parallel with the VCC and GND connections to measure the supply voltage delivered to the device. • One power supply capable of providing 100mA of supply current over the supply voltage range of +2.7V to +5.5V. 2 _______________________________________________________________________________________ MAX2683/MAX2684 Evaluation Kits 300MHz for the MAX2683 EV kit and 0.8dB at 900MHz for the MAX2684 EV kit. Detailed Description This section describes the circuitry surrounding the MAX2683/MAX2684 EV kits. Figure 1 is the schematic for the MAX2683/MAX2684 EV kits as assembled. For more detailed information covering device operation, refer to the MAX2683/MAX2684 data sheet. RF Input The RFIN port of the MAX2683/MAX2684 is internally biased and requires a DC-blocking capacitor, as well as a matching network for optimum power transfer. Capacitor C1 functions as a DC block, while inductor L1 and capacitor C2 function as a matching network, tuning the RF input of the device for maximum gain at 3.6GHz. LO Input and LO Frequency Doubler Control Analysis The MAX2683/MAX2684 include a logic-level-enabled LO frequency doubler. Jumper JU1 controls the LO doubler. A logic-level low on the ENX2 pin enables the frequency doubler, and the external LO signal source operates at half frequency. A logic-level high on the ENX2 pin disables the frequency doubler, and the external LO signal source operates at full frequency. Half-frequency LO signals are applied to the LOX2 port, while full-frequency LO signals are applied to the LOX1 port. Both ports are internally biased and require a DC-blocking capacitor. The unused LO port should be left unconnected. The MAX2683/MAX2684 EV kits, as assembled, are configured for operation of the LO signal source at half frequency. Capacitor C6 functions as a DC block, while inductor L5 improves the return loss of the port. The LOX1 port is left unconnected for half-frequency operation. To evaluate the device with full-frequency operation of the LO source, remove inductor L5 and leave the LOX2 port unconnected (Figure 2). Short resistor R4 with a 0Ω resistor. Capacitor C6 now functions as the DC block for the LOX1 port. Turn on the power supply and RF and LO signal generators. The ammeter should read approximately 55mA with the LO doubler enabled (ENX2 = GND) or 40mA with the LO doubler disabled (ENX2 = VCC). If evaluating the MAX2683, the spectrum analyzer should show an output power of approximately -14dBm at a center frequency of 300MHz. If evaluating the MAX2684, the output power should read approximately -20dBm at a center frequency of 900MHz. Be sure to take into account cable, board, and balun losses when calculating power gain. Typical balun losses are 0.3dB at The MAX2683/MAX2684 incorporate differential, opencollector IF output ports for use in either differential or single-ended applications. To ease evaluation of the devices, the MAX2683/MAX2684 EV kits utilize a balun to convert the differential signal to a single-ended signal compatible with 50Ω test equipment. The IF output of the MAX2683 is tuned for an IF frequency of 300MHz, while the IF output of the MAX2684 is tuned for an IF frequency of 900MHz. Inductors L3 and L4 provide DC biasing and impedance matching of the IF Output _______________________________________________________________________________________ 3 Evaluate: MAX2683/MAX2684 2) RF Signal Source: Set one signal generator to an RF frequency of 3.6GHz at an output power level of -20dBm. Turn the output of the signal generator off. Connect the signal generator to the RF port SMA connector using a 50Ω SMA cable. 3) LO Signal Source: The MAX2683/MAX2684 can be configured for full- or half-frequency operation of the external LO signal source. As assembled, the MAX2683/MAX2684 EV kits are configured for halffrequency operation of the LO signal source. The half-frequency LO port, LOX2, is coupled to the MAX2683/MAX2684 EV kit LO port SMA connector, while the LOX1 port is left unconnected. To evaluate the devices with the LO doubler enabled, be sure jumper JU1 is shorted to GND (ENX2 = GND). Set the LO signal generator output power to -5dBm at a frequency of 1650MHz (MAX2683) or 1350MHz (MAX2684). Turn the output of the signal generator off. Connect the signal generator to the LO port SMA connector using a 50Ω SMA cable. Evaluation of the devices with full-frequency operation of the LO signal source requires two component changes. Remove inductor L5 and leave the LOX2 port unconnected. Short the unpopulated pads of resistor R4 with a 0Ω resistor. Disable the LO frequency doubler by shunting jumper JU1 to VCC (ENX2 = VCC). Set the LO signal generator output power to -5dBm, at a frequency of 3300MHz (MAX2683) or 2700MHz (MAX2684). Turn the output of the signal generator off. Connect the signal generator to the LO port SMA connector using a 50Ω SMA cable. 4) Spectrum Analyzer: Connect the spectrum analyzer to the IF port SMA connector using a 50Ω SMA cable. Set the center frequency of the spectrum analyzer to 300MHz (MAX2683) or 900MHz (MAX2684). Set the reference level of the spectrum analyzer to -10dBm and the span to 1MHz. Evaluate: MAX2683/MAX2684 MAX2683/MAX2684 Evaluation Kits VCC 1 VCC C4 10µF 10V C3 100pF 2 GND 3 C1 3300pF SMA RFIN L1 1.2nH C2 1pF LOX1 LO MODE LOX2 JU1 5 R2 1.21k C12 100pF R4 OPEN 7 16 R1 1.21k GND GND U1 RFIN MAX2683 MAX2684 GND 15 C8 8.2pF IFOUT+ GND 14 13 GND GND 6 L5 3.9nH C6 SMA LOX 100pF 4 BIAS VCC 12 ENX2 L3* 39nH R3* 1.50k L4* 39nH IFOUT- GND LOX1 GND 3 C10* 3.3pF C7 1000pF SMA IF 4 2 1 6 11 LOX2 8 VCC T1 BALUN TOKOB4F 10 C9 8.2pF 9 * VALUES ARE FOR MAX2683 EV KIT ONLY. REFER TO COMPONENT LIST FOR MAX2684 VALUES. C5 OPEN Figure 1. MAX2683/MAX2684 EV Kits Schematic Linearity and Supply Current Adjustment L5 OPEN C6 100pF LO INPUT R4 SHORT 7 LOX2 MAX2683 MAX2684 8 LOX1 Figure 2. MAX2683/MAX2684 Full-Frequency LO Port Configuration IFOUT+, and IFOUT- ports. Resistor R3 resistively terminates the IF output. Capacitors C8 and C9 provide impedance matching in addition to DC blocking. In the MAX2683, C10 is also part of an impedance-matching network. The balun provides differential to single-ended conversion as well as 4:1 impedance transformation. The IF output is then connected to the IF port SMA connector. 4 The MAX2683/MAX2684 allow the linearity and supply current of the device to be adjusted via an external resistor, R1, to ground. Increased linearity also results in increased supply current. The MAX2683/MAX2684 EV kits are assembled with a nominal R1 value of 1.21kΩ. Replace R1 with a resistor value in the range of 820Ω to 2kΩ to experiment with the linearity of the device. Layout and Bypassing Good PC board layout is an essential aspect of RF circuit design. The EV kits’ PC board can serve as a guide for laying out a board using the MAX2683/MAX2684. Keep PC board trace lengths as short as possible to minimize parasitics and losses. Keep bypass capacitors as close to the device as possible with low-inductance connections to the ground plane. Capacitor C4, placed near the VCC connection, and capacitors C3 and C7, placed near the device, help to reduce any high-frequency crosstalk. Capacitor C12 and resistor R2, placed near the ENX2 pin on the device, help to filter out any noise that may be coupled into the ENX2 pin. _______________________________________________________________________________________ MAX2683/MAX2684 Evaluation Kits Evaluate: MAX2683/MAX2684 1.0" 1.0" Figure 3. MAX2683/MAX2684 EV Kits PC Board Layout— Component Placement Guide 1.0" Figure 4. MAX2683/MAX2684 EV Kits PC Board Layout— Component Side 1.0" Figure 5. MAX2683/MAX2684 EV Kits PC Board Layout— Ground Planes 1 and 2 Figure 6. MAX2683/MAX2684 EV Kits PC Board Layout— Solder Side _______________________________________________________________________________________ 5 Evaluate: MAX2683/MAX2684 MAX2683/MAX2684 Evaluation Kits 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 © 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.