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| 19-2592; Rev 0; 9/02 MAX9987/MAX9988 Evaluation Kits General Description The MAX9987/MAX9988 evaluation kits (EV kits) simplify the evaluation of the MAX9987/MAX9988 LO buffers/splitters. They are fully assembled and tested at the factory. Standard 50 SMA connectors are included on the EV kits for the input and all three outputs to allow quick and easy evaluation on the test bench. This document provides a list of equipment required to evaluate the device, a straight-forward test procedure to verify functionality, a circuit schematic for the EV kits, a bill of materials (BOM) for the EV kits, and artwork for each layer of the PC boards. o Fully Assembled and Tested o Two-Way Power Splitting o +14dBm to +20dBm Output Power o 1dB Output Power Variation o Isolated PLL Output (+3dBm) o Low Output Noise -170dBc/Hz at +17dBm o 40dB Reverse Isolation o More than 30dB Output-to-Output Isolation o 160mA Supply Current at +17dBm o ESD Protection Features Evaluate: MAX9987/MAX9988 Component Suppliers SUPPLIER Johnson Murata PHONE WEBSITE 507-833-8822 www.johnsoncomponents.com 770-436-1300 www.murata.com PART Ordering Information TEMP RANGE IC FREQUENCY PACKAGE RANGE (MHz) 700 to1100 1500 to 2200 MAX9987EVKIT -40C to +85C 20 QFN MAX9988EVKIT -40C to +85C 20 QFN MAX9987 Component List DESIGNATION C1, C6 C2, C4, C5, C7, C8, C9, C12-C15 C3 C10, C11 QTY 2 10 1 2 DESCRIPTION 0.1F 5% capacitors (0603) Murata GRM188R71C104K 47pF 5% capacitors (0603) Murata GRM1885C1H470J 100pF 5% capacitors (0603) Murata GRM1885C1H101J 5pF 0.25pF capacitors (0603) Murata GRM1885C11H5R0C PC board edge-mount SMA connectors (Flat tab launch) Johnson 142-0741-856 Not installed 100 5% resistor (0603) Large test point for 0.062in PC board (red) Mouser 151-107 Large test point for 0.062in PC board (black) Mouser 151-103 MAX9987EGP-T MAX9988 Component List DESIGNATION C1, C3, C6 C2, C4, C5, C7, C8, C9, C12-C15 C10, C11 QTY 3 10 2 DESCRIPTION 0.1F 5% capacitors (0603) Murata GRM188R71C104K 22pF 5% capacitors (0603) Murata GRM1885C1H220J 10pF 5% capacitors (0603) Murata GRM1885C1H100J PC board edge-mount SMA connectors (Flat tab launch) Johnson 142-0741-856 Not installed 100 5% resistor (0603) Large test point for 0.062in PC board (red) Mouser 151-107 Large test point for 0.062in PC board (black) Mouser 151-103 MAX9988EGP-T J1-J4 R1, R2, R4, R5 R3 TP1 TP2 U1 4 4 1 1 1 1 J1-J4 R1, R2, R4, R5 R3 TP1 TP2 U1 4 4 1 1 1 1 ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. MAX9987/MAX9988 Evaluation Kits Evaluate: MAX9987/MAX9988 Quick Start The MAX9987/MAX9988 EV kits are fully assembled and factory tested. Follow the instructions in the Connections and Setup section for proper device evaluation. Testing the Buffers/Splitters 1) From the procedure above, the power meter should be reading a power of about +17dBm. 2) Ensure that the supply current is not more than 175mA at VCC = 5.25V and PIN = +10dBm. 3) Disable the RF generator, turn off the DC supply and swap the power detector/power pad to OUT2 (moving the 50 termination to OUT1), and recheck output power level and stability over supply, input power, and frequency, if desired. 4) Leaving the 20dB pad and 50 termination connected to OUT2 and OUT1, move the power detector to OUTPLL and verify an output level of around +3dBm. Test Equipment Required Table 1 lists the equipment required to verify the operation of the MAX9987/MAX9988 EV kits. It is intended as a guide only, and some substitutions are possible. Connections and Setup This section provides a step-by-step guide to testing the basic functionality of the EV kits. As a general precaution to prevent damaging the outputs by driving high-VSWR loads, do not turn on DC power or RF signal generators until all connections are made. 1) Calibrate the power meter at 900MHz for the MAX9987, or at 1800MHz for the MAX9988. Important: Use a power sensor rated to at least 0dBm. Measure the loss in the 20dB attenuator (pad) that will be connected to OUT1; account for this loss as an offset in the power meter. 2) Connect the 20dB pad to OUT1. The 20dB pad maintains a reasonable load VSWR for the output driver and protects the RF equipment from accidental overload. 3) Connect a 50 termination to OUT2. 4) For the MAX9987, set the RF signal generator for 900MHz CW (i.e., unmodulated) at +10dBm (accounts for 3dB loss of input pad); for the MAX9988, set the generator for 1800MHz at +12dBm. Connect generator to EV kit input through a 3dB pad. Disable the RF output until all connections are made. 5) Connect the power sensor to OUT1's 20dB pad. 6) Set DC supply to +5.0V (set current limit around 250mA, if possible), and connect supplies to the EV kit through the ammeter. 7) Enable the RF signal generator's output. Table 1. List of Required Equipment EQUIPMENT HP E3631A Fluke 75 series II HP/Agilent 8648B HP 437B HP 8482A 20dB pad 50 termination QTY 1 1 1 1 1 1 1 DESCRIPTION Power supply Digital MultiMeter RF signal generator RF power meter High-power sensor (power head) 20dB (1W) attenuators 50 (1W) termination Layout Considerations A properly designed PC board is an essential part of any RF/microwave circuit. Keep RF signal lines as short as possible to reduce losses, radiation, and inductance. For best performance, route the ground pin traces directly to the exposed paddle underneath the package. This paddle should be connected to the ground plane of the board by using multiple vias under the device to provide the best RF/thermal conduction path. Solder the exposed paddle, on the bottom of the device package, to a PC board exposed pad. 2 _______________________________________________________________________________________ MAX9987/MAX9988 Evaluation Kits Evaluate: MAX9987/MAX9988 POWER SUPPLY 3-OUT, HPIB (AG E3631A) + - + - 50 VCC GND OUTPLL OUT1 50 RF SIGNAL GENERATOR (HP 8648B) 3dB (1W) MAX9987/MAX9988 EV KIT IN OUT2 20dB (1W) RF HIGHPOWER SENSOR RF POWER METER (GIGA 80701A, HP 437B) Figure 1. Test Setup Diagram _______________________________________________________________________________________ 3 MAX9987/MAX9988 Evaluation Kits Evaluate: MAX9987/MAX9988 TP1 VCC C15 +5.0V +5.0V +5.0V C1 C2 R3 100 C3 C4 J3 SMA OUT 1 TP2 GND SMA OUTPLL OUTPLL J2 C14 C13 VCC1 20 19 18 GND 17 GND 16 OUT1 +5.0V 15 14 13 12 VCC2 VCC2 GND VCC3 +5.0V VCC3 C10 C9 C11 C12 GND J1 SMA IN +5.0V C7 C5 IN VCCREF C6 GND REF 1 2 3 4 BIAS 5 MAX9987 MAX9988 11 GND BIASOUT BIASIN OUT2 GND 10 6 7 8 9 R4* R5* C8 R1* R2* J4 SMA OUT2 *THESE RESISTORS ARE LEFT UNINSTALLED FROM FACTORY. REFER TO TABLE 1 IN THE MAX9987/MAX9988 DATA SHEET FOR INFORMATION ON SELECTING OPTIONAL VALUES TO SET OUTPUT POWER. Figure 2. MAX9987/MAX9988 EV Kit Schematic 4 _______________________________________________________________________________________ MAX9987/MAX9988 Evaluation Kits Evaluate: MAX9987/MAX9988 1.0" Figure 3a. MAX9987 EV Kit PC Board Layout--Top Silkscreen 1.0" Figure 3b. MAX9988 EV Kit PC Board Layout--Top Silkscreen 1.0" Figure 4. MAX9987/MAX9988 EV Kit PC Board Layout--Top Soldermask 1.0" Figure 5. MAX9987/MAX9988 EV Kit PC Board Layout--Top Layer 5 _______________________________________________________________________________________ MAX9987/MAX9988 Evaluation Kits Evaluate: MAX9987/MAX9988 1.0" Figure 6. MAX9987/MAX9988 EV Kit PC Board Layout--Inner Layer 2 (Gnd) 1.0" Figure 7. MAX9987/MAX9988 EV Kit PC Board Layout--Inner Layer 3 (Routes) 1.0" Figure 8. MAX9987/MAX9988 EV Kit PC Board Layout--Bottom Layer 6 1.0" Figure 9. MAX9987/MAX9988 EV Kit PC Board Layout--Bottom Soldermask _______________________________________________________________________________________ MAX9987/MAX9988 Evaluation Kits Evaluate: MAX9987/MAX9988 1.0" Figure 10. MAX9987/MAX9988 EV Kit PC Board Layout-- Bottom Silkscreen 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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