19-0019; Rev 0 ; 8/04 _________________________ The MAX3746 evaluation kit (EV kit) simplifies evaluation of the MAX3746 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 MAX3746 EV kit is fully assembled and tested. ♦ Fully Assembled and Tested ♦ Test Point for Easy Monitoring of LOS ♦ Polarity Reversal Control ♦ Jumpers Allow Quick Selection for Loss of Signal Threshold Level ! DESIGNATION QTY C1, C2, C7, C10 4 C3, C4, C6, C8, C9, C11, C14-C18 12 0. 1 µF, 10% 10V min ceramic capacitor (0402) C20 1 C21 1 1 2.2µF, 10%, 10V min ceramic capacitor (0805) 33µF 10V min 5% tantalum Capacitor (CASE B) (0402) 30.1k Ω, 1% resistor R1 DESCRIPTION 1000pF 10% 10V min ceramic capacitor (0201) PART MAX3746EVKIT "#$ TEMP. RANGE -40°C to +85°C IC PACKAGE 16 QFN % 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 MAX3746 when ordering from these suppliers. 2k Ω, 1% resistor (0402) R3 R4 1 14k Ω, 1% resistor (0402) R5 1 24.9k Ω, 1% resistor (0402) 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, 5 1.2µH, 5% Chip inductor (Coilcraftblocks, 1008LS) Jumper 2 Pins 0.1” spacing JU6, JU7 3 JU8 1 TP2, TP3, TP9, TP10 4 Test point Digikey 5000KND JU2-JU9 8 Shunts J1-J8 8 SMA edge mount tab Johnson 142-0701-851 MAX3746EGE 1 MAX3746 Rev A Evaluation Circuit Board U1 Jumper blocks, 3 Pins 0.1” spacing block, 3 Pins +1 Jumper Pin 0.1” _________________________________________________________________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 & 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 = 13k Ω (RTH). Shunt JU6 connecting R7 = 10k Ω (RLOS). Shunt JU5 connecting pin LOS to DISABLE. _______________ NAME JU2, JU3, JU4 !( 8) Connect TP2 to VCC. 9) Connect the power-supply ground to the GND pad and then connect a +3.3V power supply to the VCC. 10) Observe a limited signal at the output, roughly 0.8Vp-p. 11) Lower the amplitude of the input signal from 500mVp-p to 15mVp-p or less. The output signal is squelched. ! ) & '% 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 center pin (OUTPOL) to VCC for full-swing non-inverted output signal. Shunt to GND to have an inverted full-swing output. Leave open for reduced-amplitude non-inverted output. Connect to 30kΩ for reduced-amplitude inverted output signal. JU9 Shunt to connect RSSI output to RSSI resistor R8. 2 _________________________________________________________________________________________ $ * V CC L1 1.2µH VCC C21 + 33µF C20 2.2µF C18 0.1µF GND C11 0.1µF JU9 J1 IN+ C4 0.1µF GND C1 0.001µF J2 IN- C3 0.1µF C2 0.001µF RSSI V CC V CC IN+ OUT+ IN- V CC TH C6 = 0.1uF NC NC MAX3746 U1 V CC C9 0.1µF OUT- OUTPOL DIS LOS JU5 GND TP3 JU8 R8 3.01k TP10 TP9 C10 0.001µF C8 0.1µF J3 OUT- C7 0.001µ F JU7 JU6 TP2 J6 C14 0.1µF J5 C16 0.1µF J7 C17 0.1µF J8 C15 0.1µF Figure 1. MAX3746 electrical schematic. _________________________________________________________________________________________ 3 MAX3746 JUMPER DIAGRAM RSSI JU9 JU5 JU4 RTH= 2k RTH= 13k RTH= 25k JU3 LOS-DISABLE Connect JU7 JU6 JU8 GND OUTPOL 30k JU2 VCC R6 =10k (top) R7 =4.75k(bottom) Disable Outputs not reversed. Full signal swing. TP2 - Connect to VCC to power LOS circuitry Outputs Enabled. Use only when LOS-DISABLE not connected Figure 2. Jumper Diagram. 4 _________________________________________________________________________________________ Figure 3. MAX3746 EV Kit Component Placement Guide – Component Side (2X) _________________________________________________________________________________________ 5 Figure 4. MAX3746 EV Kit PC Board Layout – Component Side (2X) 6 _________________________________________________________________________________________ Figure 5. MAX3748A EV Kit PC Board Layout – Ground Plane (2X) _________________________________________________________________________________________ 7 Figure 6. MAX3746 EV Kit PC Board Layout – Power Plane (2X) 8 _________________________________________________________________________________________ Figure 7. MAX3746 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.