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| 19-1111; Rev 0; 8/96 MAX3681 Evaluation Kit _______________General Description The MAX3681 evaluation kit (EV kit) simplifies evaluation of the MAX3681 622Mbps, SDH/SONET 1:4 deserializer. The EV kit requires only a single +3.3V supply and includes all the external components necessary to interface with 3.3V PECL and LVDS logic. The board can be connected directly to the output of a clock-anddata-recovery circuit (such as the MAX3675) and to the input of an LVDS device (such as an overhead termination circuit). A signal generator or stimulus system can be used with an oscilloscope, to evaluate the MAX3681's basic functionality. ____________________________Features o Single +3.3V Supply o Inputs and Outputs Terminated for Interfacing with 3.3V PECL and LVDS Logic o Fully Assembled and Tested Evaluates: MAX3681 _______________Detailed Description The MAX3681 EV kit simplifies evaluation of the MAX3681. The EV kit operates from a single +3.3V supply and includes all the external components necessary to interface with 3.3V PECL and LVDS logic. Each PECL input (SCLK+, SCLK-, SD+, SD-) is terminated on the EV board with the Thevenin equivalent of 50 to (VCC - 2V). These inputs can be driven directly by the output of any 3.3V PECL device, such as a clock-and-data-recovery circuit (e.g., the MAX3675). All LVDS outputs (PCLK+, PCLK-, PD_+, PD_-) are differentially terminated with 100 resistors between complementary outputs. Each output can directly drive an LVDS input or a high-impedance input oscilloscope (see the section Connecting LVDS Outputs to 50 Input Oscilloscopes). When driving an LVDS input that already includes 100 differential termination, remove the termination resistor corresponding to the appropriate LVDS output. The synchronization inputs (SYNC+, SYNC-) are internally terminated LVDS inputs with 100 differential input resistance. Ensure that LVDS devices driving these inputs are not redundantly terminated. All signal inputs and outputs use coupled 50 transmission lines. All input signal lines are of equal length to minimize propagation-delay skew. Likewise, all output signal lines are of equal length. ______________Ordering Information PART MAX3681EVKIT-SO TEMP. RANGE -40C to +85C BOARD TYPE Surface Mount ____________________Component List DESIGNATION QTY C1-C4, C7 C5 C6 C8-C11 J1-J16 L1 R1, R3, R5, R7 R2, R4, R6, R8 R9-R13 U1 +3.3V, GND None 5 1 1 4 16 1 4 4 5 1 2 1 DESCRIPTION 0.1F ceramic capacitors 33F, 6.3V tantalum capacitor Sprague 293D336X06R3C2 2.2F ceramic capacitor 100pF ceramic capacitors SMA connectors (PC edge mount) 56nH inductor Coilcraft 0805CS-560 130, 5% resistors 82, 5% resistors 100, 5% resistors MAX3681EAG 2-pin headers MAX3681 data sheet __________Applications Information Connecting LVDS Outputs to 50 Input Oscilloscopes To monitor an LVDS signal on a 50 input oscilloscope, remove the differential load resistor between the complementary outputs and AC couple each output to an oscilloscope input. For example, to observe the PD0 signal on a 50 input instrument, remove resistor R12 from the EV board and place a capacitor or DC block in series with each output (PD0+ or PD0-) and the instrument input. Do not connect MAX3681 outputs directly to 50 inputs or terminations to ground. Choose a coupling capacitor large enough in value to prevent pattern-dependent distortion of the output signal. 1 ______________Component Suppliers SUPPLIER Coilcraft Sprague PHONE (847) 639-6400 (603) 224-1961 FAX (847) 639-1469 (603) 224-1430 ________________________________________________________________ Maxim Integrated Products For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 Evaluates: MAX3681 J7 R9 100 J8 SMA PD3J9 SMA PD2+ J10 SMA PD2C1 0.1F VCC J1 VCC C2 0.1F VCC J2 C3 0.1F VCC J3 C4 0.1F VCC J4 J6 SMA SYNC+ L1 56nH VCC C6 2.2F C7 0.1F C8 100pF C10 100pF C9 100pF C11 100pF R13 100 R7 130 R8 82 SMA SYNCR12 100 J5 J13 SMA PD0+ J14 SMA PD0J15 SMA PCLK+ J16 SMA PCLKR5 130 R6 82 SYNC+ SYNCVCC GND PCLK+ PCLKGND PD1PD0+ PD0R3 130 R4 82 PD3+ PD3GND PD2+ PD2PD1+ R1 130 R2 82 R10 100 SMA PD3+ MAX3681 Evaluation Kit Figure 1. MAX3681 EV Kit Schematic VCC MAX3681 VCC SD+ SDVCC SCLK+ SCLKVCC J11 SMA PD1+ R11 100 J12 SMA PD11 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 C5 33F 6.3V THIS SYMBOL REPRESENTS A TRANSMISSION LINE OF CHARACTERISTIC IMPEDANCE Z0 = 50 2 SMA SD+ SMA SD- SMA SCLK+ SMA SCLK- +3.3V _______________________________________________________________________________________ GND MAX3681 Evaluation Kit Evaluates: MAX3681 Figure 2. MAX3681 EV Kit Component Placement Guide--Component Side _______________________________________________________________________________________ 3 MAX3681 Evaluation Kit Evaluates: MAX3681 Figure 3. MAX3681 EV Kit PC Board Layout--Component Side 4 _______________________________________________________________________________________ MAX3681 Evaluation Kit Evaluates: MAX3681 Figure 4. MAX3681 EV Kit PC Board Layout--Solder Side _______________________________________________________________________________________ 5 MAX3681 Evaluation Kit Evaluates: MAX3681 Figure 5. MAX3681 EV Kit PC Board Layout--Power Plane 6 _______________________________________________________________________________________ MAX3681 Evaluation Kit Evaluates: MAX3681 Figure 6. MAX3681 EV Kit PC Board Layout--Ground Plane _______________________________________________________________________________________ 7 MAX3681 Evaluation Kit Evaluates: MAX3681 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) 1996 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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