19-1466; Rev 0; 6/99 MAX2472/MAX2473 Evaluation Kits Features The MAX2472/MAX2473 evaluation kits (EV kits) simplify evaluation of the MAX2472/MAX2473 VCO buffers. They enable performance testing and require no additional support circuitry. All inputs and outputs use SMA connectors to facilitate connection of RF test equipment. ♦ Easy Evaluation of MAX2472/MAX2473 ♦ +2.7V to +5.5V Single-Supply Operation ♦ Variable Bias Control (MAX2473) 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 highimpedance 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. ♦ All Critical Peripheral Components Included MAX2472 Component List DESIGNATION QTY C1, C4 C2, C5, C9 2 1pF ±0.1pF ceramic capacitors (0603) Murata GRM39COG1R0B50V 3 0.01µF 5% ceramic capacitors (0603) Murata GRM39X7R103J50V 4 100pF 5% ceramic capacitors (0603) Murata GRM39COG101J50V C10 1 1µF 5% ceramic capacitor (0805) L1 1 12nH 5% inductor (0603) Coilcraft 0603HS-12NTJBC 1 12nH 5% inductor (0603) Coilcraft 0603HS-12NTJBC R1–R5 0 Not installed R6, R7 2 0Ω resistors (0603) JU1 VCC, GND 0 2 Ordering Information PART Not installed Test points IC SOT PACKAGE TOP MARK TEMP. RANGE MAX2472EVKIT -40°C to +85°C SOT23-6 AAAZ MAX2473EVKIT -40°C to +85°C SOT23-6 AABA MAX2473 Component List DESIGNATION QTY DESCRIPTION C1 1 1pF ±0.1pF ceramic capacitor (0603) Murata GRM39COG1R0B50V C2, C9 2 0.01µF 5% ceramic capacitors (0603) Murata GRM39X7R103J50V C3, C7, C8 3 100pF 5% ceramic capacitors (0603) Murata GRM39COG101J50V C4, C5, C6 0 Not installed C10 1 1µF 5% ceramic capacitor (0805) L1 1 12nH 5% inductor (0603) Coilcraft 0603HS-12NTJBC DESCRIPTION C3, C6, C7, C8 Z1 ♦ Single (MAX2473) or Dual (MAX2472) OpenCollector Outputs Z1 1 0Ω resistor (0603) R1, R6 2 0Ω resistors (0603) R2 1 11kΩ 5% resistor (0603) R3 1 15kΩ 5% resistor (0603) R4 1 23kΩ 5% resistor (0603) R5, R7 0 Not installed JU1 1 6-pin header None 1 Shunt (JU1) VCC, GND 2 Test points IN, OUT1 2 SMA connectors (PC edge-mount) EF Johnson 142-0701-801 IN, OUT1, OUT2 3 SMA connectors (PC edge-mount) EF Johnson 142-0701-801 U1 1 MAX2472EUT (6-pin SOT23, top mark AAAZ) U1 1 MAX2473EUT (6-pin SOT23, top mark AABA) None 1 MAX2472/MAX2473 PC board None 1 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. Evaluate: MAX2472/MAX2473 General Description Evaluate: MAX2472/MAX2473 MAX2472/MAX2473 Evaluation Kits _________________________Quick Start _______________Detailed Description The MAX2472/MAX2473 EV kits are fully assembled and factory tested. Follow the instructions in the Connections and Setup section for proper device evaluation. 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 VCC decoupling network. Note the location of each component; a relatively large 1µF tantalum capacitor, C10, is located near the VCC connector. Placed near the device, a substantially smaller 0.01µF decoupling capacitor, C9, reduces any high-frequency interference. The EV kits include pad R5 to facilitate simple termination of the input. Test Equipment Required This section lists the test equipment recommended to verify operation of the MAX2472/MAX2473. It is intended as a guide only, and some substitutions are possible. • DC power supply capable of supplying a minimum of 10mA at +2.7V to +5.5V • RF spectrum analyzer capable of making measurements 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 output 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 VCC 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 RBIAS = 15kΩ. 3) Connect OUT1 to the spectrum analyzer’s RF 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 biassupply 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). Component Suppliers SUPPLIER PHONE FAX Coilcraft 800-322-2645 847-639-1469 E.F. Johnson 402-474-4800 402-474-4858 http://www.ef johnson.com Murata 770-436-1300 770-436-3030 http://www. murata.com 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 harmonic (1800MHz) will be approximately -35dBm (-25dBc). 2 URL http://www. coilcraft.com _______________________________________________________________________________________ MAX2472/MAX2473 Evaluation Kits Evaluate: MAX2472/MAX2473 VCC R6 0Ω L1 12nH SMA OUT1 C3 100pF C2 0.01µF 1 OUT1 C1 1pF 2 GND U1 MAX2472 MAX2473 VCC 6 GND 5 C4* 1pF SMA OUT2 VCC GND C8 100pF C7 100pF 3 OUT2 C10 1µF C9 0.01µF IN 4 SMA IN R5 OPEN Z1 C5* R1* C6* 1 3 5 2 4 6 R2* JU1 R7 * R3* R4* VCC *REFER TO APPROPRIATE COMPONENT LIST FOR COMPONENT VALUES. Figure 1. MAX2472/MAX2473 EV Kit Schematic 1.0" 1.0" Figure 2. MAX2472/MAX2473 EV Kit Component Placement Guide—Top Silkscreen Figure 3. MAX2472/MAX2473 EV Kit PC Board Layout— Component Side _______________________________________________________________________________________ 3 Evaluate: MAX2472/MAX2473 MAX2472/MAX2473 Evaluation Kits 1.0" 1.0" Figure 4. MAX2472/MAX2473 EV Kit PC Board Layout—Main Ground Plane Figure 5. MAX2472/MAX2473 EV Kit PC Board Layout—VCC Plane 1.0" Figure 6. MAX2472/MAX2473 EV Kit PC Board Layout—Solder Side 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. 4 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.