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| 19-2799; Rev 0 ; 1/03 MAX3748 Evaluation Kit _______________ General Description The MAX3748 evaluation kit (EV kit) simplifies evaluation of the MAX3748 limiting amplifier. The EV kit allows for quick threshold level selections, provides a RSSI output signal (when used with the MAX3744) and includes a calibration circuit. The MAX3748 EV kit is fully assembled and tested. _________________________Features Evaluates: MAX3748 Fully Assembled and Tested Test Point for Easy Monitoring of LOS Polarity Reversal Control Selectable Offset Correction Loop Capacitance Jumpers Allow Quick Selection for Loss of Signal Threshold Level ____________________ Component List DESIGNATION C1, C2, C7, C10 C3, C4, C6, C8, C9, C11, C12 C14-C18 ______________ Ordering Information PART MAX3748EVKIT TEMP. RANGE -40C to +85C IC PACKAGE 16 QFN Q T 4 1 2 1 1 1 1 1 1 1 1 6 3 4 9 8 DESCRIPTION 0.001F 10% 10V min ceramic capacitor (0201) 0. 1 F, 10% 10V min ceramic capacitor (0402) 2.2F, 10%, 10V min ceramic capacitor (0805) 33F 10V min 5% tantalum 82 , 5% resistor (0201) 270 , 5% resistor (0201) 20k , 1% resistor (0401) 4.75k , 1% resistor (0402) 10k , 1% resistor (0402) 3.01k , 1% resistor (0402) 1.2H, 5% Chip inductor Jumper blocks, 2 Pins 0.1" spacing Jumper blocks, 3 Pins 0.1" Test point Digikey 5000KND Shunts SMA edge mount tab Johnson 142-0701-851 MAX3748EGE MAX3748 Rev A Evaluation Circuit Board MAX3748 Data Sheet ______________Component Suppliers SUPPLIER AVX Coilcraft Murata PHONE 843-444-2863 847-639-6400 415-964-6321 FAX 843-626-3123 847-639-1469 415-964-8165 C20 C21 R3 R4 R5 R6 R7 R8 L1 JU2-JU5, JU9, JU11 JU6, JU7, JU8 TP2, TP3, TP9, TP10 JU2-JU9, JU11 J1-J8 U1 Note: Please indicate that you are using the MAX3748 when ordering from these suppliers. 1 1 _________________________________________________________________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 MAX3748 Evaluation Kit Evaluates: MAX3748 _________________________ Quick Start 1) 2) 3) Connect OUT+ and OUT- to a 50 terminated oscilloscope. Connect IN+ and IN- to a 500mVP-P, 3.2Gbps differential data stream. Remove all shunts. Shunt JU8 to VCC so that there is no inversion of signal polarity. (OUTPOL, VCC). Figure 2 shows the jumper diagram for the board. Shunt JU4 connecting R3 = 82 (RTH). Shunt JU6 connecting R7 = 10k (RLOS). Shunt JU5 connecting pin LOS to DISABLE. 8) 9) Connect TP2 to VCC. Shunt jumper JU11 so that the capacitor C12 is connected to pins CAZ1 and CAZ2. 4) 5) 6) 7) 10) Connect the power-supply ground to the GND pad and then connect a +3.3V power supply to the VCC. 11) Observe a limited signal at the output, roughly 0.8Vp-p. 12) Lower the amplitude of the input signal from 500mVp-p to 15mVp-p or less. The output signal is squelched. _______________Adjustment and Control Descriptions (see Quick Start first) FUNCTION NAME JU2, JU3, JU4 JU5 Selects loss of signal assert/deassert level. Shunt to connect the LOS pin to the DISABLE pin (Squelch) Shunt to connect series resistor from LOS to test point TP2. Make sure TP2 is connected to a positive supply. Disable. Shunting to VCC holds the outputs static. Shunt to GND to reverse the output signal's polarity (OUTPOL). For normal operation, shunt to VCC. Shunt to connect RSSI output to RSSI resistor R8. JU6 JU7 JU8 JU9 JU11 Shunt to connect C12 to CAZ1 and CAZ2 2 _________________________________________________________________________________________ MAX3748 Evaluation Kit Evaluates: MAX3748 _________________________________________________________________________________________ 3 MAX3748 Evaluation Kit Evaluates: MAX3748 Figure 2. Jumper Diagram. 4 _________________________________________________________________________________________ MAX3748 Evaluation Kit Evaluates: MAX3748 Figure 3. MAX3748 EV Kit Component Placement Guide - Component Side (2X) _________________________________________________________________________________________ 5 MAX3748 Evaluation Kit Evaluates: MAX3748 Figure 4. MAX3748 EV Kit PC Board Layout - Component Side (2X) 6 _________________________________________________________________________________________ MAX3748 Evaluation Kit Evaluates: MAX3748 Figure 5. MAX3748 EV Kit PC Board Layout - Ground Plane (2X) _________________________________________________________________________________________ 7 MAX3748 Evaluation Kit Evaluates: MAX3748 Figure 6. MAX3748 EV Kit PC Board Layout - Power Plane (2X) 8 _________________________________________________________________________________________ MAX3748 Evaluation Kit Evaluates: MAX3748 Figure 7. MAX3748 EV Kit PC Board Layout - Solder Side (2X) Maxim makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Maxim assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters can and do vary in different applications. All operation parameters, including "typicals" must be validated for each customer application by customer's technical experts. Maxim products are not designed, intended or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Maxim product could create a situation where personal injury or death may occur. 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 ___________________ 9 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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