19-2369; Rev 0; 4/02 MAX3802 Evaluation Kit The MAX3802 evaluation kit (EV kit) is an assembled demonstration board that provides easy evaluation of the MAX3802 quad adaptive equalizer with cable drivers. SMA connectors with 50Ω controlled-impedance transmission lines to the MAX3802 are provided for all input and output ports. ♦ Fully Assembled and Tested ♦ Single +3.3V Power-Supply Operation ♦ SMA Connectors for Inputs and Outputs ♦ Includes Potentiometer for Adjusting Driver Output Amplitude Component List DESIGNATION QTY DESCRIPTION C1, C3 2 33µF ±10% tantalum capacitors (Case-B) C2, C4 2 1µF ±10% ceramic capacitors (0805) C7–C66 60 0.1µF ±10% ceramic capacitors (0402) 12 Test points J3–J34 32 SMA connectors (edge mount) L1, L2 2 56nH inductors (0805) R1–R4 4 100kΩ ±1% resistors (0402) R5, R8, R10, R12 4 Open R6, R7, R9, R11 4 0Ω resistors (0402) R13–R16 4 20kΩ potentiometers U1 1 MAX3802UGK 68-pin QFN None 1 MAX3802 EV board None 1 MAX3802 data sheet Component Suppliers PHONE PART TEMP RANGE MAX3802EVKIT 0°C to +85°C IC PACKAGE 68 QFN-EP *EP = exposed pad J1, J2, J35, J36, TP1–TP8 SUPPLIER Ordering Information Quick Start Connect power-supply ground to the GND pin (J35). Apply +3.3V to the VCC1 pin (J1). Due to a small voltage drop across the inductor, the true voltage on the part (measured across C1) is slightly lower than +3.3V. Adjust the power supply until the voltage across C1 measures +3.3V. Note: This step applies power to channels 1 and 2 only. To supply power to channels 3 and 4, ground and a +3.3V supply must be connected to J35 (GND) and J1 (VCC2). Cable Driver 1) Connect a differential input signal (600mVP-P differential input amplitude) to one of the cable driver inputs at SMA edge connectors J9 (DIN1-) and J10 (DIN1+). 2) Connect a 50Ω oscilloscope to SMA output connectors J7 (DOUT-) and J8 (DOUT+) to observe the output of the cable driver. FAX AVX 803-946-0690 803-626-3123 Coilcraft 847-639-6400 847-639-1469 Murata 814-237-1431 814-238-0490 Venkel 800-950-8365 512-794-0087 Please indicate that you are using the MAX3802 when contacting these component suppliers. ________________________________________________________________ Maxim Integrated Products 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. 1 Evaluates: MAX3802 Features General Description Evaluates: MAX3802 MAX3802 Evaluation Kit 3) Adjust R13, the R MOD1 potentiometer, for 20kΩ resistance by turning the potentiometer clockwise until a faint click is heard. 4) Potentiometer R13 (R MOD 1) can be adjusted between 10kΩ and 20kΩ to change the cable driver output amplitude. Note: Measuring the resistance on the potentiometer is difficult because of internal resistances and ESD diodes on the IC. The potentiometer can be removed and discrete resistors placed on the R5, R8, R10, and R12 positions, so that the exact resistance of RMOD can be known. Refer to Cable Driver Output vs. RMOD in the Typical Operating Characteristics of the MAX3802 data sheet for RMOD values. Adaptive Cable Equalizer 1) Connect a differential input signal (600mVP-P differential input amplitude) to a cable. Connect the other end of the cable to one of the cable equalizers’ inputs at SMA edge connectors J3 (EIN1-) and J4 (EIN1+). Detailed Description Connecting CML Outputs to 50Ω Oscilloscopes CML outputs have a common-mode voltage near VCC, which is incompatible with oscilloscopes terminated in 50Ω to ground. To avoid interfering with the commonmode voltage, all MAX3802 CML outputs are ACcoupled on board with 0.1µF capacitors. The CML outputs should not be connected directly through 50Ω to ground. Exposed-Pad Package The EP of the 68-pin QFN package provides a very low thermal resistance path for heat removal from the IC. The pad is also electrical ground on the MAX3802 and must be soldered to the circuit board for proper thermal and electrical performance. Refer to Maxim Application Note HFAN-08.1, Thermal Considerations for QFN and Other Exposed Pad Packages, available at www.maxim-ic.com for additional application information. 2) Connect a 50Ω oscilloscope to SMA output connectors J5 (EOUT1-) and J6 (EOUT1+) to view the output of the cable equalizer. 3) The cable integrity monitor (CIM1) high-impedance output can be monitored at TP1. 4) The loss-of-signal (LOS1) TTL output can be monitored at TP5. Note: The MAX3802 equalizer design requires that the data stream be scrambled or coded to provide a rich frequency spectrum for the adaptation algorithm. In the absence of an input signal (nonstandard application), amplified noise can appear at the output due to the large gain of the device. 2 _______________________________________________________________________________________ MAX3802 Evaluation Kit VCC1 L1 56nH DIN4J33 DOUT4J31 VCC2 R8 OPEN EIN4+ J28 EOUT4+ J30 J1 DOUT4+ J32 DIN4+ J34 C2 1µF C1 33µF EOUT4J29 R16 20kΩ C51 0.1µF EIN4J27 C52 0.1µF C53 0.1µF C54 0.1µF C55 0.1µF J35 VCC1 VCCE2 18 VCC1 VCC1 49 48 TP2 C15 0.1µF C17 0.1µF VCC1 TP6 LOS2 C19 0.1µF C20 0.1µF C21 0.1µF C22 0.1µF CIM2 J12 EIN2+ J11 EIN2- J14 EOUT2+ J13 EOUT2- R9 0Ω R10 OPEN DIN3- J25 VCC2 C28 0.1µF 47 DOUT3+ VCC2 J24 J23 DOUT3- 46 45 J26 C27 0.1µF RMOD3 44 43 VCC2 EOUT3+ VCC2 CIM3 VCC2 C24 0.1µF EIN3+ EIN3- 36 35 J22 C25 0.1µF TP3 39 38 C65 0.1µF R5 OPEN J21 EOUT3- 41 40 R6 0Ω C26 0.1µF 42 R15 20kΩ VCC2 J20 J19 C23 0.1µF VCC1 C39 0.1µF C40 0.1µF C41 0.1µF C42 0.1µF C43 0.1µF J16 J18 DIN2+ DOUT2+ R14 20kΩ DIN3+ R2 100kΩ VCC1 VCC1 C18 0.1µF C16 0.1µF C62 0.1µF C61 0.1µF LOS2 VCCE3 DIN2+ EIN3- LOS1 R1 100kΩ C60 0.1µF 52 VCCE4 EIN4- 54 VCCE4 53 56 55 58 EOUT4+ EOUT4- 60 RMOD4 VCCE4 61 62 VCCD4 DOUT4- 64 63 65 DOUT4+ DIN4- VCCD4 66 DIN1+ 33 17 34 16 C59 0.1µF LOS3 C29 0.1µF EIN3+ 37 DIN2- TP5 LOS1 TP7 C30 0.1µF VCCE3 VCCD2 DIN1+ R3 100kΩ 50 DIN1- 32 C14 0.1µF C58 0.1µF 51 VCCD1 31 J10 15 CIM3 DOUT2+ C13 0.1µF DIN1- VCCE3 DOUT1+ DOUT2- J9 14 DOUT1- 30 VCC1 EOUT3- 29 13 VCCD1 RMOD2 C12 0.1µF DOUT1+ EOUT3+ RMOD1 VCCD2 12 VCCE3 27 J8 11 MAX3802 VCCE1 28 C11 0.1µF DOUT1- RMOD3 EOUT2+ J7 10 VCC1 VCCD3 U1 EOUT1+ VCCE2 R11 0Ω R13 20kΩ R12 OPEN 9 EOUT1- 26 VCC1 RMOD1 8 DOUT3- 25 C10 0.1µF EOUT1+ VCCE1 EOUT2- 7 DOUT3+ VCCE2 J6 6 VCCD3 24 C9 0.1µF EOUT1- VCCE1 CIM1 CIM2 VCC1 J5 4 5 DIN3- 23 TP1 CIM1 EIN1+ 22 3 VCC1 DIN3+ EIN2+ EIN1+ C57 0.1µF VCC2 EIN1- VCCE2 C8 0.1µF 21 J4 2 C56 0.1µF C32 0.1µF VCC2 LOS3 EIN2- C7 0.1µF EIN1- VCC2 VCCE1 20 J3 1 19 VCC1 C63 0.1µF 67 LOS4 J36 DIN4+ 68 C4 1µF C3 33µF C34 0.1µF VCC2 59 VCC2 VCC2 CIM4 C35 0.1µF C37 0.1µF R4 100kΩ J2 C31 0.1µF EIN4+ VCC2 L2 56nH VCC2 TP4 CIM4 C33 0.1µF R7 0Ω C36 0.1µF VCCE4 C38 0.1µF 57 TP8 LOS4 Evaluates: MAX3802 C66 RMOD4 0.1µF J15 DOUT2- VCC1 J17 DIN2C44 0.1µF C45 0.1µF C46 0.1µF C47 0.1µF C48 0.1µF C49 0.1µF C50 0.1µF RMOD2 C64 0.1µF Figure 1. MAX3802 EV Kit Schematic _______________________________________________________________________________________ 3 Evaluates: MAX3802 MAX3802 Evaluation Kit 1.0" Figure 2. MAX3802 EV Kit Component Placement Guide—Component Side 1.0" Figure 3. MAX3802 EV Kit Component Placement Guide—Solder Side 4 _______________________________________________________________________________________ MAX3802 Evaluation Kit Evaluates: MAX3802 1.0" Figure 4. MAX3802 EV Kit PC Board Layout—Component Side 1.0" Figure 5. MAX3802 EV Kit PC Board Layout—Ground Plane _______________________________________________________________________________________ 5 Evaluates: MAX3802 MAX3802 Evaluation Kit 1.0" Figure 6. MAX3802 EV Kit PC Board Layout—Power Plane 1.0" Figure 7. MAX3802 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 6 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.