19-2470; Rev 0; 5/02 MAX3782 Evaluation Kit Features ♦ Fully Assembled and Tested ♦ +3.3V Operation ♦ Allows Easy Testing of Thermal Performance ♦ Easy Selection of Operating Modes Component Suppliers SUPPLIER AVX PHONE FAX 803-946-0690 803-626-3123 Coilcraft 847-639-6400 847-639-1469 Note: Please indicate that you are using the MAX3782 when contacting these component suppliers Ordering Information PART MAX3782EVKIT TEMP RANGE IC PACKAGE -5°C to +85°C 68 QFN-EP* *Exposed pad Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION J31, J32, TP1, TP2 4 Test points C1–C19, C22– C26, C34–C46 37 0.1µF ±10%, 10V (min) ceramic capacitors (0402) C20 1 33µF ±10%, 16V (min) tantalum capacitor J34–J37, J45–J57 0 Not installed 3 3-pin headers (0.1in centers) 1 2.2µF ±10%, 16V (min) tantalum capacitor J38, J39, J40 C21 J41–J44 0 Not installed R1–R8 8 0Ω ±5% resistors (0603) R9, R10, R11 3 10kΩ ±1% resistors (0603) R12–R25 0 Not installed R26 1 360Ω ±5% resistor (0402) U1 1 MAX3782UGK 68-pin QFN-EP U2 1 Inverter Digi-Key 296-1106-1, Texas Instruments SN74AHCT04PWR None 1 MAX3782 EV kit circuit board, rev A C27, C28 2 0.01µF ±10%, 10V (min) ceramic capacitors (0402) C29 0 Not installed 4 1µF ±10%, 10V (min) ceramic capacitors (0603) C47 1 22pF ±5%, 10V (min) ceramic capacitor (0402) D1 1 Red LED T-1 package J1–J22, J33 23 SMB connectors, PC mount Digi-Key J467-ND C30–C33 J23–J30 8 SMA Connectors, side mount Digi-Key J502-ND None 1 MAX3782 EV kit data sheet None 1 MAX3782 data sheet ________________________________________________________________ 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: MAX3782 General Description The MAX3782 evaluation kit (EV kit) is an assembled demonstration board that provides easy evaluation of the MAX3782 dual 1.25Gbps transceiver. The MAX3782 EV kit requires one +3.3V supply and includes an LED to indicate the lock status of MAX3782 PLLs. Evaluates: MAX3782 MAX3782 Evaluation Kit Quick Start 1) Apply +3.3V to the VCC pin. Connect power supply ground to the GND pin. 2) Disable system loopback by shorting the VCC side of the LOOPEN jumper. 3) Apply 1.25Gbps data to the RX1± and RX2± inputs. 4) Apply a 125MHz reference clock to the REFCLK± inputs. 5) Apply 1.25Gbps LVDS data to the TDAT1± and TDAT2± inputs. 6) Apply 625MHz input clocks to the TCLK1± and TCLK2± inputs. The phase drift between TCLK and REFCLK must be <800ps after reset (refer to the MAX3782 data sheet). 7) Briefly short the GND side of the RESET jumper. Move the short to the VCC side for normal operation. 8) The LOCK LED should light, indicating that the transmitter and receiver are in lock. 9) The data from RX1± should be present at the RDAT1± output, with the recovered 625MHz clock at the RCLK1± output. 10) The data applied at the TDAT1± input should be present at the TX1± output. Detailed Description Interfacing to CML Inputs and Outputs All CML inputs (RX1± and RX2±) and outputs (TX1± and TX2±) on the MAX3782 are AC-coupled to simplify testing. Differential input data should be between 370mVP-P and 2000mVP-P (185mVP-P and 1000mVP-P or measured single ended). The CML outputs are AC-coupled to allow for direct connection to 50Ω oscilloscopes. Interfacing to LVDS Inputs and Outputs The LVDS outputs (RDAT_± and RCLK_±) are ACcoupled to allow direct interfacing to 50Ω oscilloscopes. The LVDS inputs (TDAT_± and TCLK_±) are DC-coupled. For these inputs to function, provide the proper AC and DC voltages. The LVDS inputs require DC biasing and therefore cannot be AC-coupled. 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 (C1–C4 and C13–C16) must be replaced with 0Ω shorts. Terminating Unused Outputs If only 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 MAX3782 has an integrated temperature sensor to indicate the temperature of the die. Independently power the temperature sensor circuit by applying 3.3V to the center pin of J39 and applying ground to the GND pin. Monitor the TEMPSENS output voltage at TP1 to allow calibration of the temperature sensor. Exposed-Pad Package The exposed-pad (EP), 68-pin QFN incorporates features that provide a very low thermal resistance path for heat removal from the IC. The pad is electrical ground on the MAX3782 and must be soldered to the circuit board for proper thermal and electrical performance. Table 1. Controls, Test Points and LEDs NAME LOOPEN (JU38) 2 TYPE 3-pin header VCCTEMP (JU39) 3-pin header RESET (JU40) 3-pin header D1 PIN VCC DESCRIPTION Short for normal operation GND Short to enable loopback testing VCC Short to connect VCC for the TEMPSENS circuit to the rest of the VCC network GND Short to disable the TEMPSENS circuit VCC Short for normal operation GND Momentarily short to reset FIFO and receiver components LED LOCK D1 lights only when the transmitter PLL and both receiver PLLs are in lock TP1 Test point TEMPSENS When JU3 is shorted to VCC, the voltage at TP1 is proportional to the die junction temperature TP2 Test point LOCK TP2 can be used to monitor the voltage at the LOCK output _______________________________________________________________________________________ MAX3782 Evaluation Kit Evaluates: MAX3782 REFCLK+ J10 SMB REFCLK+ VCC REFCLKRDAT1+ J2 SMB VCC RDAT1J1 SMB R9 10kΩ J33 SMB TDO-TJAG J50 J51 TDO-JTAG J52 C14 0.1µF C13 0.1µF VCC TCLK2+ TCLK2- TDAT2+ TDAT2- C29 OPEN 68 J49 J3 J9 SMB J57 R25 OPEN SMB RCLK1R10 10kΩ BIAS-1-POS RCLK1+ J4 SMB 67 66 65 VCC5 RDAT1- RDAT1+ 64 63 RCLK1- RCLK1+ R24 OPEN VCC C16 0.1µF C15 0.1µF C28 0.01µF 58 C27 0.01µF 62 GND 61 60 VCC6 59 REFCLK- REFCLK+ GND BIAS-1-NEG 1 GND R12 OPEN J11 2 SMB TCLK2+ R13 OPEN J12 3 SMB TCLK2- R14 OPEN J13 4 SMB TDAT2+ R15 OPEN J14 5 SMB 6 7 TDAT2- GND TRST-TJAG VCC 8 J15 RCLK2+ J16 J17 U1 9 SMB RCLK2- RDAT2+ RCLK2+ MAX3782 C2 0.1µF 10 SMB RCLK2- C3 0.1µF 11 SMB J18 RDAT2- RDAT2+ C4 0.1µF 12 SMB 13 VCC LOCK VCC5 C1 0.1µF R11 10kΩ 14 RDAT2- GND LOCK VCC3 TP2 15 VCC VCC3 C19 0.1µF R26 360Ω U2-A 2 17 RXFIL2 GND 1 TDI-JTAG TMS-JTAG TCK-JTAG 74HCO4 18 VCC 19 VCC VCC5 RX1+ 22 23 VCC RX1- VCC5 24 25 R20 OPEN R21 OPEN GND VCC 26 VCC5 RX2+ 27 28 VCC VCC J36 J37 SMB J21 TMS–JTAG TDI–JTAG SMB J20 TDI–JTAG SMB J19 TRST–JTAG GND 21 J35 TMS–JTAG J34 TRST–JTAG 20 VCC SMB J22 TCK–JTAG C47 22pF 16 C12 0.1µF TCK–JTAG D1 RED LED J53 C11 0.1µF J23 J24 SMATAB SMATAB RX1+ R22 OPEN J54 J55 J56 RX1+ RX1- RX2+ RX2- C10 0.1µF J25 SMATAB RX1- Figure 1. MAX3782 EV Kit Schematic (1 of 2) _______________________________________________________________________________________ 3 Evaluates: MAX3782 MAX3782 Evaluation Kit TDAT1- TCLK1- J5 SMB J7 SMB BIAS-1-POS BIAS-1-NEG J45 TDAT1+ J6 SMB TCLK1+ J8 SMB R1 0Ω R5 0Ω R2 0Ω R6 0Ω R3 0Ω R7 0Ω VCC C30 1µF TDAT1- J46 BIAS-1-NEG TDAT1+ J43 J47 VCC C31 1µF BIAS-1-POS TCLK1+ LVDS BIAS+ R18 OPEN R17 OPEN R16 VCC OPEN 57 56 55 54 53 52 TDAT1- TDAT1+ TCLK1- TCLK1+ VCC6 RESET C23 0.1µF J44 J40 R19 OPEN VCC1 LVDS BIAS- TCLK1- J48 C22 0.1µF VCC2 BIAS-2-POS J42 C32 1µF CML BIAS+ C24 0.1µF BIAS-2-NEG J41 CML BIASGND 51 VCC1 GND R8 0Ω VCC3 VCC C20 33µF 50 J32 C18 0.1µF TXFIL R4 0Ω J31 VCC1 C21 2.2µF C33 1µF C26 0.1µF C25 0.1µF GND 49 VCC2 VCC1 VCC3 C45 0.1µF C44 0.1µF 48 C46 0.1µF VCC VCC4 VCC 47 C5 0.1µF TX2+ 46 SMATAB J30 TX2- MAX3782 SMATAB 45 VCC J29 VCC C36 0.1µF VCC C37 0.1µF C38 0.1µF VCC VCC VCC VCC TX2C39 0.1µF VCC VCC4 VCC C35 0.1µF TX2+ C6 0.1µF U1 VCC C34 0.1µF C40 0.1µF C41 0.1µF C42 0.1µF 44 DISTRIBUTED FILTER CAPS GND 43 VCC VCC4 42 C7 0.1µF TX1+ 41 SMATAB J28 TX1+ C8 0.1µF TX1- 40 SMATAB J27 TX1- VCC VCC4 39 VCC VCC6 38 C17 VCC2 0.1µF RXFIL1 VCC2 GND RX2- VCC5 29 30 VCC GND 31 37 36 35 VCCTEMP TEMPSENS LOOPEN 32 33 34 VCC J38 R23 OPEN LOOPEN C9 0.1µF TP1 VCC J26 J39 SMATAB VCCTEMP Figure 1. MAX3782 EV Kit Schematic (2 of 2) 4 _______________________________________________________________________________________ C43 0.1µF MAX3782 Evaluation Kit Evaluates: MAX3782 1.0" Figure 2. MAX3782 EV Kit Component Placement Guide—Component Side _______________________________________________________________________________________ 5 Evaluates: MAX3782 MAX3782 Evaluation Kit 1.0" Figure 3. MAX3782 EV Kit PC Board Layout—Component Side 1.0" Figure 5. MAX3782 EV Kit PC Board Layout—Power Plane 6 1.0" Figure 4. MAX3782 EV Kit PC Board Layout—Solder Side 1.0" Figure 6. MAX3782 EV Kit PC Board Layout—Ground Plane _______________________________________________________________________________________ MAX3782 Evaluation Kit Evaluates: MAX3782 1.0" Figure 7. MAX3782 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 _____________________ 7 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.