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| 19-2821; Rev 0; 4/03 MAX3804 Evaluation Kit General Description The MAX3804 DC-coupled evaluation kit (EV kit) simplifies evaluation of the MAX3804 12.5Gbps settable equalizer. The EV kit enables full testing of the device functions including all equalization settings. SMA connectors with 50 controlled-impedance transmission lines to the MAX3804 are provided for all CML input and output ports. Features o DC-Coupled Evaluation Kit o SMA Connectors for All High-Speed Inputs and Outputs o Fully Assembled and Tested Evaluates: MAX3804 Quick Start Note: The MAX3804 EV kit is a DC-coupled evaluation board. Care must be taken to ensure that no direct short between the supply voltage and supply ground exists. Use external coupling capacitors on the input and output when AC-coupling is desired. DC-coupled operation with positive VCC supplies normally causes permanent damage to laboratory test equipment (typical oscilloscope, BERT). The MAX3804 EV kit must be operated from a negative VEE supply when DC-coupled to normal laboratory equipment. 1) Connect a -3.3V power supply to TP3 (V EE ). Connect the power-supply ground to TP2 (GND) and J6 (VCC). Install shunts in JP2 and JP3, and remove shunt from JP1. 2) Install shunts across pins 2 and 3 of JPEQ1, JPEQ2, and JPEQ3 for minimal equalization (0, 0, 0). See Table 1 for the relationship between nominal path loss and FR-4 microstrip path length. 3) Apply a differential input signal (400mV P-P to 1200mVP-P) between SMA connectors J1 and J2 (SDI+ and SDI-). 4) Attach a differential high-speed oscilloscope with a 50 input to SMA connectors J3 and J4 (SDO+ and SDO-) to observe the output of the equalizer. Ordering Information PART MAX3804EVKIT TEMP RANGE -40C to +85C IC PACKAGE 16 QFN Component List DESIGNATION QTY C1-C5 C6 C7-C10 J1-J4 JP1, JP2, JP3 JPEQ1, JPEQ2, JPEQ3 R3 R4 R5 GND, VCC, VCC1, VCC2, VEE, TP4, TP5 U1 None None None 5 1 4 4 3 3 1 1 1 7 1 5 1 1 DESCRIPTION 0.1F 10% ceramic capacitors (0402) 0.1F 10% ceramic capacitor (0603) 33F 10% tantalum capacitors (case-B) SMA connectors, tab contact 2-pin headers, 0.1in centers 3-pin headers, 0.1in centers 10k resistor (0402) 12k resistor (0402) 8k resistor (0402) Test points MAX3804ETE Shunts MAX3804 EV board MAX3804 data sheet Table 1. Relationship Between Nominal Path Loss and FR-4 Microstrip Path Length JPEQ3 0 JPEQ2 JPEQ1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 NOMINAL 6-mil FR-4 MICROSTRIP LENGTH (in) 2 6 10 14 18 22 26 30 Component Suppliers SUPPLIER AVX Coilcraft Murata Zetex PHONE 803-946-0690 847-639-6400 814-237-1431 516-543-7100 FAX 803-626-3123 847-639-1469 814-238-0490 516-864-7630 0 0 0 1 1 1 1 Note: 0 refers to pins 2 and 3 shunted. 1 refers to pins 1 and 2 shunted. ________________________________________________________________ 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. MAX3804 Evaluation Kit Evaluates: MAX3804 Adjustment and Control Descriptions (see Quick Start) COMPONENT NAME JPEQ1 JPEQ2 JPEQ3 EQ1 EQ2 EQ3 FUNCTION Equalizer boost control logic input LSB Equalizer boost control logic input Equalizer boost control logic input MSB DC-Coupled Operation with Laboratory Equipment Connect a +1.85V power supply to J6 (VCC). Connect a -1.65V power supply to TP3 (V EE ). Connect the power-supply ground to TP2 (GND). Install shunts JP2 and JP3. Remove shunt JP1. With this setup the part can be DC-coupled to external laboratory equipment (typical oscilloscope, BERT). DC-Coupled Operation with Oscilloscopes and BERTs The MAX3804 is designed with DC-coupled inputs and outputs, implemented with internal 50 terminations to V CC1 (SDI) and V CC2 (SDO). Laboratory oscilloscopes and BERTs normally terminate their inputs and outputs with 50 to ground. When the MAX3804 VCCs are connected to a positive supply, a DC path exists from the power supply to the ports of the oscilloscope or BERT. This configuration can cause permanent damage to the oscilloscope or BERT. When the MAX3804 EV kit is being used with normal oscilloscopes or BERTs, either external AC-coupling must be provided or VCC1 and VCC2 must be connected to ground (i.e., using a negative VEE supply). Failure to do so may permanently damage laboratory equipment. C5 0.1F VEE 16 15 GND VCC 14 N.C. 13 VCC2 C3 0.1F VCC2 12 VEE J4 SDO+ J3 SDOVCC2 VEE C4 0.1F N.C. C1 VCCI 0.1F VEE 1 2 J2 SDIVCCI 3 4 C2 0.1F R3 10k VEE JPEQ1 JPEQ2 R4 12k JPEQ3 VCC 5 VCC1 SDI+ SDIVCC1 GND EG1 EQ2 EQ3 VCC Alternative Supply Configurations AC-Coupled Operation with VCC1 = VCC2 = +1.65V Connect a +3.3V power supply to J6 (VCC). Connect a +1.65V power supply to TP1 (VCC1) and J5 (VCC2). Connect the power-supply ground to TP2 (GND). Remove shunts JP2 and JP3. Install shunt JP1. Use external AC-coupling for connecting to external laboratory equipment (typical oscilloscope, BERT). TP5 J5 VCC2 C7 33F J6 VCC TP3 VEE C10 33F JP3 TP4 VCC VCC2 J1 SDI+ U1 MAX3804 SDO+ SDO- 11 10 VEE C8 33F C6 0.1F JP1 VEE VCC2 9 C9 33F TP2 GND TP1 VCC1 6 7 8 VCC1 JP2 R5 8k VEE TP8 TP9 TP10 Figure 1. MAX3804 Schematic Diagram 2 _______________________________________________________________________________________ MAX3804 Evaluation Kit Evaluates: MAX3804 1.0" Figure 2. MAX3804 Component Placement Guide 1.0" Figure 3. MAX3804 PC Board Layout--Component Side _______________________________________________________________________________________ 3 MAX3804 Evaluation Kit Evaluates: MAX3804 1.0" Figure 4. MAX3804 PC Board Layout--Ground Plane 1.0" Figure 5. MAX3804 PC Board Layout--Power Plane 4 _______________________________________________________________________________________ MAX3804 Evaluation Kit Evaluates: MAX3804 1.0" Figure 6. MAX3804 PC Board Layout--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 _____________________ 5 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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