19-1996; Rev 0; 4/01 MAX3881 Evaluation Kit Features ♦ Fully Assembled and Tested ♦ +3.3V Operation ♦ On-Board Output Terminations Ordering Information PART TEMP. RANGE IC PACKAGE MAX3881EVKIT -40°C to +85°C 64 TQFP-EP* *Exposed pad Component List DESIGNATION QTY C1, C2, C3, C6, C8, C15–C18, C23–C39 26 0.1µF ±10% ceramic capacitors (0603) C22 1 0.1µF ±10% ceramic capacitor (0805) C4, C5, C7, C12, C13, C14, C19, C20, C21 9 100pF ±10% ceramic capacitors (0402) C9 1 33µF ±10%, 10V tantalum capacitor Sprague 293D336X0010C2 1 2.2µF ±10%, 10V tantalum capacitor AVX TAJB225K035 C10 DESCRIPTION DESIGNATION QTY DESCRIPTION R12, R13, R14, R18–R29, R75, R76, R77 18 49.9Ω termination resistors (not installed) R6, R9, R16, R31, R34, R37, R40, R43, R47, R50, R52, R55, R58, R61, R64, R67, R70, R73 18 475Ω ±1% resistors (0402) R11 1 Leave site open D1 1 PC-mount LED J9, J10, J20, J22, J24, J25, J27, J29, J31, J33, J35, J37, J39, J41–J45 18 J1–J4 4 SMA connectors (side mount) 3 56nH inductors Coilcraft 0805CS-560XKBC SMB connectors (PC mount) C11 1 Leave site open R1 1 2kΩ variable resistor R2, R3 2 1kΩ ±1% resistors (0402) L1, L2, L3 R4 1 392Ω ±1% resistor (0402) GND, +3.3V, TP1 3 Test points U1 1 MAX3881ECB 64-pin TQFP JU6 1 3-pin header (0.1in centers) JU7 1 2-pin header (0.1in centers) JU6, JU7 2 None 1 None 1 Shunts MAX3881 EV kit circuit board, Rev C MAX3881 data sheet R5, R8, R15, R30, R33, R36, R39, R42, R46, R49, R51, R54, R57, R60, R63, R66, R69, R72 R7, R10, R17, R32, R35, R38, R41, R44, R45, R48, R53, R56, R59, R62, R65, R68, R71, R74 18 18 127Ω ±1% resistors (0402) 49.9Ω ±1% resistors (0402) ________________________________________________________________ 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: MAX3881 General Description The MAX3881 evaluation kit (EV kit) is an assembled demonstration board that provides easy evaluation of the MAX3881 2.488Gbps SDH/SONET 1:16 deserializer with clock recovery. The EV kit requires only one +3.3V supply and includes all the external components necessary to interface with CML inputs and PECL outputs. The board can be connected to the output of a limiting amplifier circuit (such as the MAX3866) and to the input of a PECL device (such as an overhead termination circuit). A signal generator or stimulus system can be used with an oscilloscope to evaluate the MAX3881’s basic functionality. Evaluates: MAX3881 MAX3881 Evaluation Kit Component Suppliers SUPPLIER PHONE FAX AVX 803-946-0690 803-626-3123 Coilcraft 847-639-6400 847-639-1469 Sprague 650-526-8393 650-965-1644 Note: Please indicate that you are using the MAX3881 when contacting these component suppliers. _________________________ Quick Start 1) Apply +3.3V to the VCC pin. Connect power-supply ground to the GND pin. 2) Select between the serial-data inputs, pins 2 and 3 of JU6 (SDI EN), or the system loopback inputs, pins 1 and 2 of JU6 (SLBI EN), with a 2-pin jumper. 3) Verify that the shunt across jumper JU7 is in place. 4) Connect a 2.488Gbps nonreturn-to-zero (NRZ) data signal (50mVp-p <VIN <800mVp-p differential) to the selected inputs with 50Ω cables. 5) Connect the parallel output to an oscilloscope or other test equipment. ________________Detailed Description The MAX3881 EV kit simplifies evaluation of the MAX3881, 1:16 deserializer with clock recovery. The EV kit operates from a single +3.3V supply and includes all the external components necessary to interface with 3.3V CML inputs and PECL outputs. CML Inputs The input terminals for the differential 2.488Gbps serialdata inputs (SDI+, SDI-, SLBI+, SLBI-) are AC-coupled to on-board SMA connectors. Limiting amplifiers with differential output swings between 50mVp-p and 800mVp-p can be connected directly to the SMA connectors. Phase Adjustment Internal phase adjustment is available on the MAX3881 EV kit. Phase adjust resistor R1, although not required, can be used to shift the sampling edge of the recovered clock relative to the data eye. Ensure that JU7 is removed when adjusting PHADJ. 2 Loss-of-Lock Monitor Phase-locked loop (PLL) frequency lock conditions can be monitored at the high-impedance loss-of-lock (LOL) test point. A TTL high (LED off) indicates PLL frequency lock, while a TTL low (LED on) indicates a loss-of-lock condition. Note that the LOL circuitry will not detect a loss-of-power condition. ___________Applications Information Connecting PECL Outputs to 50Ω Oscilloscopes PECL outputs are designed to be terminated with 50Ω to (VCC - 2V). Because most oscilloscopes provide a termination of 50Ω to ground, a level-shift network is incorporated on the evaluation board to allow connection of the parallel outputs of the EV kit directly to 50Ω equipment. The level-shift network also provides a 50Ω impedance for matching the source impedance to the transmission line. In addition to the level-shifting network, 50Ω terminations are located at the end of each output line (underneath the SMB connectors) in order to properly terminate unused outputs. Terminating Unused Outputs Because most labs are not equipped to test all 16 parallel outputs at once, pads are available beneath each SMB connector to place 50Ω termination resistors. In addition to terminating the unconnected transmission lines (which may act as high-frequency stubs if not terminated), these 50Ω termination resistors complete the Thèvenin equivalent load of 50Ω to (VCC - 2V) required by the PECL outputs. Note that the Thèvenin equivalent terminations are designed for use with a +3.3V supply. While performance may not be severely degraded by having some improperly terminated outputs, some measurements (such as supply current) will be affected. Exposed-Pad Package The 64-pin TQFP-EP incorporates features that provide a very low thermal-resistance path for heat removal from the IC. The pad is electrical ground on the MAX3881 and must be soldered to the circuit board for proper thermal and electrical performance. _______________________________________________________________________________________ _______________________________________________________________________________________ GND +3.3V C9 33µF 10V C10 2.2µF 10V SLB- SLB+ SD- SD+ J4 J3 J2 J1 56nH L2 56nH L1 56nH L3 C8 0.1µF C6 0.1µF C3 0.1µF C1 0.1µF R2 1kΩ C17 0.1µF C16 0.1µF C15 0.1µF C2 0.1µF JU7 R1 2kΩ C19 100pF C12 100pF C7 100pF 3 C20 100pF C13 100pF 2 C21 100pF C14 100pF 1 VCC_PLL VCC_PLL VCC_PLL 16 15 14 13 12 11 R61 475Ω R60 VCC 127Ω R13 49.9Ω R62 49.9Ω J41 PCLK- C23 0.1µF VCC C15 100pF R12 49.9Ω U1 MAX3881 J10 C24 0.1µF PD0 R14 49.9Ω R10 49.9Ω R9 475Ω R8 VCC 127Ω J42 C18 0.1µF PD1 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 VCC R64 475Ω R63 VCC 127Ω VCC GND VCC PD5 VCC PD6 VCC PD7 VCC GND VCC PD8 VCC PD9 VCC PD10 VCC R54 127Ω R18 49.9Ω R65 49.9Ω 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 GND GND SIS VCC_PLL SLBI- SLBI+ VCC_PLL SDI- SDI+ VCC_PLL PHADJ- PHADJ+ VCC_VCO FIL- R16 475Ω R17 49.9Ω J9 PCLK+ GND FIL+ VCC 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 R15 VCC 127Ω C4 100pF VCC_PLL +3.3V 9 8 7 6 5 4 3 2 1 10 TP1 R4 C11 392Ω OPEN VCC_VCO C22 0.1µF JU6 VCC_VCO JU5 R11 OPEN JU4 JU3 JU1 LOL PCLK+ JU2 GND R3 1kΩ VCC PD15 PCLK- +3.3V VCC PD0 VCC +3.3V PD14 VCC VCC_PLL D1 VCC PD1 R77 49.9Ω PD13 VCC PD15 VCC PD2 J39 GND VCC GND GND VCC GND R7 49.9Ω PD14 J37 VCC PD12 VCC R5 127Ω R76 49.9Ω R59 49.9Ω PD11 VCC PD3 R6 475Ω R58 475Ω VCC PD4 C39 0.1µF R57 127Ω GND VCC VCC CW C38 0.1µF J43 PD2 C25 0.1µF R55 475Ω C37 0.1µF R19 49.9Ω R68 49.9Ω R67 475Ω R66 VCC 127Ω VCC VCC VCC R75 49.9Ω R56 49.9Ω J44 VCC PD3 R20 49.9Ω R71 49.9Ω R70 475Ω R69 VCC 127Ω R24 49.9Ω R38 49.9Ω R37 475Ω PD8 J45 R21 49.9Ω R74 49.9Ω R73 475Ω R72 VCC 127Ω R25 49.9Ω R41 49.9Ω R40 475Ω J20 PD5 C28 0.1µF J27 R43 475Ω R42 VCC 127Ω R47 475Ω C35 0.1µF R22 49.9Ω R32 49.9Ω R31 475Ω R30 VCC 127Ω R26 49.9Ω R44 49.9Ω VCC PD9 R46 127Ω J33 C32 0.1µF PD12 R39 VCC 127Ω R29 49.9Ω R53 49.9Ω PD4 C27 0.1µF J25 C31 0.1µF R52 475Ω C36 0.1µF R36 VCC 127Ω R51 127Ω J35 PD7 C26 0.1µF J24 PD13 J22 PD6 J29 R50 475Ω R49 VCC 127Ω PD11 R23 49.9Ω R35 49.9Ω R34 475Ω R33 VCC 127Ω R27 49.9Ω R45 49.9Ω PD10 C29 0.1µF J31 C33 0.1µF R28 49.9Ω R48 49.9Ω C30 0.1µF C34 0.1µF Evaluates: MAX3881 VCC MAX3881 Evaluation Kit Figure 1. MAX3881 EV Kit Schematic 3 Evaluates: MAX3881 MAX3881 Evaluation Kit Figure 2. MAX3881 EV Kit Component Placement Guide—Component Side 4 _______________________________________________________________________________________ MAX3881 Evaluation Kit Evaluates: MAX3881 Figure 3. MAX3881 EV Kit PC Board Layout—Component Side _______________________________________________________________________________________ 5 Evaluates: MAX3881 MAX3881 Evaluation Kit Figure 4. MAX3881 EV Kit PC Board Layout—Solder Side 6 _______________________________________________________________________________________ MAX3881 Evaluation Kit Evaluates: MAX3881 Figure 5. MAX3881 EV Kit PC Board Layout—Power Plane _______________________________________________________________________________________ 7 Evaluates: MAX3881 MAX3881 Evaluation Kit Figure 6. MAX3881 EV Kit PC Board Layout—Ground Plane 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. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.