19-3041; Rev 0 ; 10/03 MAX3748A Evaluation Kit The MAX3748A evaluation kit (EV Kit) simplifies evaluation of the MAX3748A 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 MAX3748A EV kit is fully assembled and tested. ____________________ Component List DESIGNATION C1, C2, C7, C10 C3, C4, C6, C8, C9, C11, C12 C14-C18 Q T 4 1 DESCRIPTION 0.001µF 10% 10V min ceramic capacitor (0201) 0. 1 µF, 10% 10V min ceramic capacitor (0402) C20 2 1 C21 1 33µF 10V min 5% tantalum 82 Ω, 5% resistor (0201) R4 1 270 Ω, 5% resistor (0201) R5 1 20k Ω, 1% resistor (0201) R6 1 R7 1 4.75k Ω, 1% resistor (0402) 10k Ω, 1% resistor (0402) R8 1 3.01k Ω, 1% resistor (0402) L1 1 JU2-JU5, JU9, JU11 JU6, JU7, JU8 6 1.2µH, 5% Chip inductor Jumper blocks, 2 Pins 0.1” spacing R3 2.2µF, 10%, 10V min ceramic capacitor (0805) 3 Jumper blocks, 3 Pins 0.1” TP2, TP3, TP9, TP10 4 Test point Digikey 5000KND JU2-JU9, JU11 9 Shunts J1-J8 8 SMA edge mount tab Johnson 142-0701-851 U1 _________________________Features ♦ 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 ______________ Ordering Information PART TEMP. RANGE IC PACKAGE MAX3748AEVKIT -40°C to +85°C 16 QFN ______________Component Suppliers SUPPLIER PHONE FAX AVX 843-444-2863 843-626-3123 Coilcraft 847-639-6400 847-639-1469 Murata 415-964-6321 415-964-8165 Note: Please indicate that you are using the MAX3748A when ordering from these suppliers. MAX3748AEGE 1 MAX3748A Rev A Evaluation Circuit Board 1 MAX3748A Data Sheet _________________________________________________________________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 Evaluates: MAX3748A _______________ General Description Evaluates: MAX3748A MAX3748A Evaluation Kit _________________________ Quick Start 1) 2) 3) 4) 5) 6) 7) Connect OUT+ and OUT- to a 50Ω 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 Ω (RTH). Shunt JU6 connecting R7 = 10k Ω (RLOS). Shunt JU5 connecting pin LOS to DISABLE. _______________Adjustment NAME JU2, JU3, JU4 8) 9) Connect TP2 to VCC. Shunt jumper JU11 so that the capacitor C12 is connected to pins CAZ1 and CAZ2. 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. and Control Descriptions (see Quick Start first) FUNCTION Selects loss of signal assert/deassert level. JU5 Shunt to connect the LOS pin to the DISABLE pin (Squelch) JU6 Shunt to connect series resistor from LOS to test point TP2. Make sure TP2 is connected to a positive supply. JU7 Disable. Shunting to VCC holds the outputs static. JU8 Shunt to GND to reverse the output signal’s polarity (OUTPOL). For normal operation, shunt to VCC. JU9 Shunt to connect RSSI output to RSSI resistor R8. JU11 Shunt to connect C12 to CAZ1 and CAZ2 2 _________________________________________________________________________________________ MAX3748A Evaluation Kit Evaluates: MAX3748A Figure 1. MAX3748A EV Kit Schematic. _________________________________________________________________________________________ 3 Evaluates: MAX3748A MAX3748A Evaluation Kit Figure 2. Jumper Diagram. 4 _________________________________________________________________________________________ MAX3748A Evaluation Kit Evaluates: MAX3748A Figure 3. MAX3748A EV Kit Component Placement Guide – Component Side (2X) _________________________________________________________________________________________ 5 Evaluates: MAX3748A MAX3748A Evaluation Kit Figure 4. MAX3748A EV Kit PC Board Layout – Component Side (2X) 6 _________________________________________________________________________________________ MAX3748A Evaluation Kit Evaluates: MAX3748A Figure 5. MAX3748A EV Kit PC Board Layout – Ground Plane (2X) _________________________________________________________________________________________ 7 Evaluates: MAX3748A MAX3748A Evaluation Kit Figure 6. MAX3748A EV Kit PC Board Layout – Power Plane (2X) 8 _________________________________________________________________________________________ Evaluates: MAX3748 MAX3748A Evaluation Kit Figure 7. MAX3748A 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.