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| 19-1996; Rev 0; 4/01 MAX3881 Evaluation Kit 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. o Fully Assembled and Tested o +3.3V Operation o On-Board Output Terminations Features Evaluates: MAX3881 Ordering Information PART MAX3881EVKIT TEMP. RANGE -40C to +85C IC PACKAGE 64 TQFP-EP* *Exposed pad Component List DESIGNATION C1, C2, C3, C6, C8, C15-C18, C23-C39 C22 C4, C5, C7, C12, C13, C14, C19, C20, C21 QTY 26 DESCRIPTION 0.1F 10% ceramic capacitors (0603) 0.1F 10% ceramic capacitor (0805) 100pF 10% ceramic capacitors (0402) 33F 10%, 10V tantalum capacitor Sprague 293D336X0010C2 2.2F 10%, 10V tantalum capacitor AVX TAJB225K035 Leave site open 2k variable resistor 1k 1% resistors (0402) 392 1% resistor (0402) L1, L2, L3 GND, +3.3V, TP1 U1 JU6 18 127 1% resistors (0402) JU7 JU6, JU7 None None 18 49.9 1% resistors (0402) 3 3 1 1 1 2 1 1 DESIGNATION R12, R13, R14, R18-R29, R75, R76, R77 R6, R9, R16, R31, R34, R37, R40, R43, R47, R50, R52, R55, R58, R61, R64, R67, R70, R73 R11 D1 J9, J10, J20, J22, J24, J25, J27, J29, J31, J33, J35, J37, J39, J41-J45 J1-J4 QTY 18 DESCRIPTION 49.9 termination resistors (not installed) 1 18 475 1% resistors (0402) 9 1 1 Leave site open PC-mount LED SMB connectors (PC mount) C9 1 C10 C11 R1 R2, R3 R4 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 1 1 1 2 1 18 4 SMA connectors (side mount) 56nH inductors Coilcraft 0805CS-560XKBC Test points MAX3881ECB 64-pin TQFP 3-pin header (0.1in centers) 2-pin header (0.1in centers) Shunts MAX3881 EV kit circuit board, Rev C MAX3881 data sheet ________________________________________________________________ Maxim Integrated Products 1 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. MAX3881 Evaluation Kit Evaluates: MAX3881 Component Suppliers SUPPLIER AVX Coilcraft Sprague PHONE 803-946-0690 847-639-6400 650-526-8393 FAX 803-626-3123 847-639-1469 650-965-1644 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. Note: Please indicate that you are using the MAX3881 when contacting these component suppliers. ___________Applications Information Connecting PECL Outputs to 50 Oscilloscopes PECL outputs are designed to be terminated with 50 to (VCC - 2V). Because most oscilloscopes provide a termination of 50 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 50 equipment. The level-shift network also provides a 50 impedance for matching the source impedance to the transmission line. In addition to the level-shifting network, 50 terminations are located at the end of each output line (underneath the SMB connectors) in order to properly terminate unused outputs. _________________________ 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 Because most labs are not equipped to test all 16 parallel outputs at once, pads are available beneath each SMB connector to place 50 termination resistors. In addition to terminating the unconnected transmission lines (which may act as high-frequency stubs if not terminated), these 50 termination resistors complete the Thevenin equivalent load of 50 to (VCC - 2V) required by the PECL outputs. Note that the Thevenin 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. ________________ 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. 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. 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 _______________________________________________________________________________________ VCC C38 0.1F VCC VCC J37 PD14 R76 49.9 J39 R75 49.9 R77 49.9 VCC_PLL D1 J33 PD12 JU2 JU1 VCC R46 127 R47 475 R29 49.9 JU3 R4 C11 392 OPEN C35 0.1F VCC VCC +3.3V CW R51 127 R53 49.9 R52 475 R7 49.9 PD13 R6 475 R5 127 C36 0.1F R56 49.9 J35 VCC R54 127 R55 475 C39 0.1F R57 127 R59 49.9 C37 0.1F R58 475 VCC VCC VCC VCC LOL GND VCC VCC GND PD15 PD14 GND PD13 PD12 C2 0.1F GND FIL+ FILVCC_VCO PHADJ+ PHADJVCC_PLL SDI+ SDIVCC_PLL PD7 VCC PD6 VCC PD5 VCC GND PD0 VCC PD1 VCC PD2 VCC VCC PD4 VCC VCC GND PD3 VCC 33 GND PCLK+ PCLK34 VCC 35 R38 49.9 R41 49.9 36 37 38 R37 475 SLBI+ SLBIVCC_PLL SIS GND GND 39 GND 41 40 R36 VCC 127 R39 VCC 127 VCC 44 43 42 VCC PD8 VCC VCC PD9 45 VCC 46 PD10 47 VCC 2 3 4 5 6 VCC_PLL 8 9 VCC_PLL 11 12 VCC_PLL 14 3 JU6 VCC_VCO C15 0.1F VCC_PLL C16 0.1F VCC C12 100pF C13 100pF C14 100pF C7 100pF 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 VCC 16 2 1 +3.3V 15 13 10 7 JU5 VCC_VCO C22 0.1F 1 48 J1 C1 0.1F PD11 GND Figure 1. MAX3881 EV Kit Schematic R1 2k JU7 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 VCC R11 OPEN JU4 TP1 R28 49.9 R48 49.9 PD11 J29 R42 VCC 127 C33 0.1F R43 475 R49 VCC 127 C34 0.1F R50 475 PD15 +3.3V R3 1k R2 1k SD+ U1 MAX3881 J2 C3 0.1F SD- J3 C6 0.1F SLB+ C31 0.1F R40 475 C32 0.1F R44 49.9 R45 49.9 J4 C8 0.1F R26 49.9 J27 PD9 R24 49.9 J24 PD7 J25 PD8 R25 49.9 J31 PD10 R27 49.9 SLB- L3 +3.3V 56nH L1 56nH L2 C17 0.1F C19 100pF C20 100pF C21 100pF C4 100pF C15 100pF C9 33F 10V R15 VCC 127 C23 0.1F R61 475 C24 0.1F R60 VCC 127 C10 2.2F 10V 56nH GND R8 VCC 127 C18 0.1F R9 475 R63 VCC 127 C25 0.1F R64 475 R66 VCC 127 C26 0.1F R67 475 R69 VCC 127 C27 0.1F R70 475 R72 VCC 127 C28 0.1F R73 475 R30 VCC 127 C29 0.1F R31 475 R33 VCC 127 C30 0.1F R34 475 R16 475 R17 49.9 R62 49.9 R10 49.9 R65 49.9 R68 49.9 R71 49.9 R74 49.9 R32 49.9 R35 49.9 R12 49.9 J9 PCLK+ J41 PCLK- R13 49.9 J10 PD0 R14 49.9 J42 PD1 R18 49.9 J43 PD2 R19 49.9 J44 PD3 R20 49.9 J45 PD4 R21 49.9 J20 PD5 R22 49.9 J22 PD6 Evaluates: MAX3881 _______________________________________________________________________________________ R23 49.9 MAX3881 Evaluation Kit 3 MAX3881 Evaluation Kit Evaluates: MAX3881 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 MAX3881 Evaluation Kit Evaluates: MAX3881 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 MAX3881 Evaluation Kit Evaluates: MAX3881 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 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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