19-2471; Rev 0; 5/02 MAX3780 Evaluation Kit Features ♦ Fully Assembled and Tested ♦ +3.3V Operation ♦ Allows Easy Testing of Thermal Performance ♦ Easy Selection of Operating Modes Component Suppliers SUPPLIER Ordering Information PHONE FAX AVX 803-946-0690 803-626-3123 MAX3780EVKIT Coilcraft 847-639-6400 847-639-1469 *EP = exposed pad. PART TEMP RANGE IC PACKAGE 0°C to +70°C 100 TQFP-EP* Component List DESIGNATION QTY C1–C21, C26–C28, C31, C32, C34–C49, C68, C69, C73, C79–C90 57 C22 1 C23 1 DESCRIPTION 0.1µF ±10%, 10V (min) ceramic capacitors 0402 22pF ±5%, 10V (min) ceramic capacitor (0402) DESIGNATION QTY DESCRIPTION JU1–JU4, JU6, JU7 6 Shunts JU3 1 2-pin header, 0.1 in center L1, L3, L4 3 56nH inductors Coilcraft 0805CS-XKBC R1 1 383Ω ±1% resistor (0402) R2, R23, R25 3 0Ω ±5% resistors (0402) 0.1µF ±10%, 10V (min) ceramic capacitor (0603) R4, R6, R13 3 10.0kΩ ±1% resistors (0402) R5, R7 2 4.99kΩ ±1% resistors (0402) R8, R9 2 49.9Ω ±1% resistors (0402) R14–R22 0 Open TP2 0 Open U1 1 MAX3780CCQ 100-pin TQFP-EP U2 1 Inverter Digi-Key 296-1106-1 or Texas Instruments SN74AHCT04PWR VCC, GND, TP1, TP3 4 Test points None 1 MAX3780 EV kit circuit board, rev B None 1 MAX3780 EV kit data sheet None 1 MAX3780 data sheet C24, C70, C74 3 1.0µF ±10%, 10V (min) ceramic capacitors (0805) C29 1 33µF ±10%, 4V (min) tantalum capacitor C30 1 2.2µF ±10%, 10V (min) ceramic capacitor (0805) D1 1 Green LED T-1 package J1–J38 38 SMB connectors, PC mount Digi-Key J467-ND J44–J48, J51–J61 16 SMA connectors, side-mount tabs Digi-Key J502-ND JU1, JU2, JU4, JU6, JU7 5 3-pin headers, 0.1in centers ________________________________________________________________ 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: MAX3780 General Description The MAX3780 evaluation kit (EV kit) is an assembled demonstration board that provides easy evaluation of the MAX3780 quad 2.5Gbps cable transceiver. The MAX3780 EV kit requires only a single +3.3V supply and includes an LED to indicate the lock status of the MAX3780 PLLs. Evaluates: MAX3780 MAX3780 Evaluation Kit Quick Start 1) Apply +3.3V to the V CC pin (J49). Connect the power-supply ground to the GND pin (J50). 2) Disable system loopback by shorting the VCC side of the LOOPEN jumper. 3) Set LVDS outputs for normal operation by shorting the VCC side of TRIEN. 4) Apply 2.5Gbps data to the RX4± inputs. If possible, apply 2.5Gbps data to all RX1± to RX4± inputs. 5) Apply a 125MHz reference clock to the REFCLK± inputs. 6) Apply 1.25Gbps LVDS data to the TDAT1± and TDAT2± inputs. 7) Apply a 625MHz input clock to the TCLK± inputs. The phase drift between TCLK and REFCLK must be < 800ps after reset. For more information, refer to the MAX3780 data sheet. 8) Briefly short the GND side of the RESET jumper. Move the short to the VCC side. 9) The LOCK LED should light, indicating that the transmitter and receiver are in lock. 10) The demultiplexed data from RX4± should be present at the RDAT7± and RDAT8± outputs, with the recovered 625MHz clock at the RCLK± outputs. 11) The data applied at the TDAT1± and TDAT2± inputs should be multiplexed and present at the TX1± outputs. Detailed Description Interfacing to CML Inputs and Outputs All CML inputs (RX1–RX4±) and outputs (TX1–TX4±) on the MAX3780 are AC-coupled and terminated to simplify connections. Differential input data with between 200mVP-P and 800mVP-P (100mVP-P and 400mVP-P as measured single ended) amplitude should be applied to the CML inputs. The CML outputs are AC-coupled, allowing direct connection to 50Ω oscilloscopes. 2 Interfacing to LVDS Inputs and Outputs The LVDS outputs (RDAT1–RDAT8± and RCLK±) are AC-coupled to allow direct interfacing to 50Ω oscilloscopes. The LVDS inputs (TDAT1–TDAT8± and TCLK±) are DC-coupled. For these inputs to function properly, provide the proper AC and DC voltages. The LVDS inputs require DC biasing and therefore cannot be ACcoupled. For this reason, if the LVDS outputs are to be externally looped back to the LVDS inputs, the AC-coupling capacitors on the EV board (C2–C9 and C11–C20) must be replaced with 0Ω shorts. Interfacing to PECL Inputs and Outputs The REFCLK± inputs of the MAX3780 use PECL logic. To simplify interfacing with test equipment, the evaluation board includes terminations of 50Ω to ground on each input, as well as DC-biasing resistors. The REFCLK inputs should be driven with a differential signal with amplitude between 620mVP-P and 1860mVP-P. Terminating Unused Outputs If one side of a differential signal is being observed on a 50Ω oscilloscope, balance the circuit by similarly terminating the other output. Temperature Sensor The MAX3780 has an integrated temperature sensor to indicate the die temperature. To independently power the temperature circuit, remove the jumper from JU3 and apply 3.3V to TP3. This allows calibration of the temperature sensor. Exposed-Pad Package The exposed-pad (EP), 100-pin TQFP incorporates features that provide a low thermal resistance path for heat removal from the IC. The pad is electrical ground on the MAX3780 and must be soldered to the circuit board for proper thermal and electrical performance. _______________________________________________________________________________________ MAX3780 Evaluation Kit Evaluates: MAX3780 Table 1. Controls, Test Points, and LEDs NAME TRIEN (JU1) LOOPEN (JU2) RESET (JU4) EQ2 (JU6) TYPE 3-pin header 3-pin header 3-pin header 3-pin header HEADER PIN VCC DESCRIPTION Short for normal operation. GND Short to put LVDS outputs in high-impedance state. VCC Short for normal operation. GND Short to enable loopback testing. VCC Short for normal operation. GND Momentarily short to reset FIFO and receiver components. MIN Sets EQ2 = 1 for minimum compensation (refer to Table 1 in MAX3780 data sheet). MAX Sets EQ2 = 0 for maximum compensation (refer to Table 1 in MAX3780 data sheet). MIN Sets EQ1 = 1 for minimum compensation (refer to Table 1 in MAX3780 data sheet). MAX Sets EQ1 = 0 for maximum compensation (refer to Table 1 in MAX3780 data sheet). EQ1 (JU7) 3-pin header VCCTEMP ENABLE (JU3) 2-pin header — Short to connect VCCTEMP to rest of board supply network. LED — D1 lights to indicate that the transmitter and receiver PLLs of the MAX3780 are in lock. TMPSENS (TP1) Test point — When the TMPSENS circuit is powered, the voltage at TP1 is proportional to the die junction temperature. PTPIN (TP2) Test point — Reserved for Maxim use. VCCTEMP (TP3) Test point — With JU3 removed, the temperature-sensing circuit can be independently powered by applying +3.3V to TP3. LOCK (D1) _______________________________________________________________________________________ 3 VCC C31 0.1mF C24 1.0mF VCC5 C73 0.1mF C74 1.0mF C68 0.1mF J6 SMB J7 SMB R19 OPEN 5 C5 0.1mF 6 C6 0.1mF 7 C7 0.1mF 8 C8 0.1mF 9 C9 0.1mF 10 R18 OPEN J10 SMB J11 SMB R17 OPEN J12 SMB J13 SMB R16 OPEN J14 SMB J15 SMB VCC1 U1 GND C12 0.1mF 14 RDAT5- C13 0.1mF 15 C14 0.1mF 16 C15 0.1mF 17 C16 0.1mF 18 RDAT7- C17 0.1mF 19 RDAT8+ C18 0.1mF 20 RDAT8- C19 0.1mF 21 RCLK+ C20 0.1mF 22 RCLK- 23 TRIEN 24 VCC1 25 GND C22 22pF MAX3780 RDAT6+ RDAT6RDAT7+ 27 VCC R13 10.0kW R1 383W 2 JU1 TRIEN TDAT4- RDAT4- 26 D1 LED VCC1 TDAT4+ RDAT4+ RDAT5+ R14 OPEN TDAT5- RDAT3- VCC J18 SMB TDAT5+ RDAT3+ 13 J17 SMB TDAT6+ RDAT2- 12 C21 0.1mF 89 RDAT2+ VCC1 J16 SMB 90 RDAT1- C11 0.1mF R15 OPEN 91 RDAT1+ 11 C10 0.1mF 92 VCC1 VCC1 J8 SMB J9 SMB C4 0.1mF 93 U2-A 74HCO4 28 29 C23 0.1mF 30 31 VCC2 32 33 34 VCC1 C84 0.1mF 35 RX3+ R20 OPEN 4 94 RX3- J5 SMB C3 0.1mF 95 VCC3 J4 SMB 3 96 RX4+ R21 OPEN C2 0.1mF 97 RX4- J3 SMB GND C1 0.1mF 2 98 VCC6 1 VCC1 J2 SMB 99 GND 100 R22 OPEN LOCK J1 SMB C32 0.1mF GND GND C30 2.2mF VCC3 C29 33mF J50 TDAT6- VCC TDAT7- J49 VCC2 TDAT7+ L3 56nH J29 SMB J30 SMB J31 SMB J32 SMB C70 1.0mF GND R25 0W C69 0.1mF TDAT8+ L4 56nH VCC2 R2 0W J33 SMB J34 SMB VCC1 RXFIL L1 56nH J35 SMB J36 SMB TDAT8- R23 0W J37 SMB J38 SMB GND Evaluates: MAX3780 MAX3780 Evaluation Kit 36 37 C28 C85 0.1mF 0.1mF C34 0.1mF VCC1 C27 C26 0.1mF 0.1mF J61 SMATAB J59 SMATAB J60 SMATAB J58 SMATAB Figure 1. MAX3780 EV Kit Schematic (Sheet 1 of 2) 4 _______________________________________________________________________________________ MAX3780 Evaluation Kit J24 SMB J23 SMB Evaluates: MAX3780 J25 SMB J26 SMB J27 SMB J28 SMB J21 SMB J22 SMB J19 SMB J20 SMB VCC R9 49.9W R7 4.99kW VCC 78 77 REFCLK- GND TXFIL RESET GND VCC4 TX1+ TX1VCC4 TX2+ TX2- U1 VCC4 MAX3780 GND VCC4 TX3+ TX3VCC4 TX4+ TX4VCC4 GND EQ1 EQ2 39 40 41 42 43 C87 0.1mF 45 46 C83 0.1mF C37 C38 0.1mF 0.1mF 47 VCC1 VCC1 48 TMPSENS 49 GND 75 VCC5 74 VCC C47 73 0.1mF RESET JU4 72 71 VCC1 C81 70 0.1mF C46 0.1mF 69 68 J44 SMATAB C45 0.1mF VCC1 J45 SMATAB 67 C44 0.1mF 66 C90 0.1mF J46 SMATAB C43 65 0.1mF VCC1 J47 SMATAB 64 C80 63 0.1mF VCC1 62 61 C42 0.1mF 60 C41 0.1mF VCC1 C89 0.1mF J48 SMATAB J51 SMATAB 59 58 C40 0.1mF 57 C39 0.1mF C88 0.1mF J52 SMATAB J53 SMATAB VCC1 56 C79 55 0.1mF VCC1 54 JU7 EQEN1 53 VCC1 52 51 GND VCCTEMP LOOPEN VCC6 GND 44 VCC1 VCC1 C35 C36 C86 0.1mF 0.1mF 0.1mF VCC3 RX1+ RX1- VCC3 RX2+ RX2- VCC3 PTPIN 38 R5 4.99kW R4 10.0kW VCC5 VCC1 R6 10.0kW 76 GND 79 GND 80 VCC6 TCLK- 81 TCLK+ 82 TDAT1+ 83 TDAT1- 84 TDAT2+ 85 TDAT2- 86 TDAT3+ 87 TDAT3- 88 VCC1 R8 49.9W REFCLK+ C82 0.1mF C48 0.1mF C49 0.1mF TP2 PTPIN JU6 EQEN2 50 JU3 TMPSENS TP1 VCCTEMP TP3 VCC1 VCCTEMP ENABLE J56 SMATAB J57 SMATAB J54 SMATAB JU2 LOOPEN J55 SMATAB Figure 1. MAX3780 EV Kit Schematic (Sheet 2 of 2) _______________________________________________________________________________________ 5 Evaluates: MAX3780 MAX3780 Evaluation Kit 1.0" Figure 2. MAX3780 EV Kit Component Placement Guide—Component Side 6 _______________________________________________________________________________________ MAX3780 Evaluation Kit Evaluates: MAX3780 1.0" Figure 3. MAX3780 EV Kit PC Board Layout—Component Side _______________________________________________________________________________________ 7 Evaluates: MAX3780 MAX3780 Evaluation Kit 1.0" Figure 4. MAX3780 EV Kit PC Board Layout—Solder Side 8 _______________________________________________________________________________________ MAX3780 Evaluation Kit Evaluates: MAX3780 1.0" Figure 5. MAX3780 EV Kit PC Board Layout—Power Plane _______________________________________________________________________________________ 9 Evaluates: MAX3780 MAX3780 Evaluation Kit 1.0" Figure 6. MAX3780 EV Kit PC Board Layout—Ground Plane 10 ______________________________________________________________________________________ MAX3780 Evaluation Kit Evaluates: MAX3780 1.0" Figure 7. MAX3780 EV Kit Component Placement Guide—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 ____________________ 11 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.