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| 19-2767; Rev 0, 2/03 MAX3872/MAX3874 Evaluation Kits ________________ General Description The MAX3872/MAX3874 evaluation kits (EV kits) simplify evaluation of the MAX3872 and MAX3874 clock and data recovery with limiting amplifier ICs. These EV kits enable testing of all MAX3872 and MAX3874 functions. SMA connectors are provided for the differential inputs and outputs. All high-speed inputs and outputs have on-board AC-coupling capacitors to allow direct connection to 50 test equipment. ______________ Ordering Information PART MAX3872EVKIT MAX3874EVKIT TEMP. RANGE -40C to +85C -40C to +85C IC PACKAGE 32 QFN 32 QFN Evaluate: MAX3872/MAX3874 ______________Component Suppliers SUPPLIER AVX Coilcraft Digi-Key EF Johnson Murata PHONE 843-448-9411 847-639-6400 800-344-4539 402-474-4800 770-436-1300 FAX 843-626-3123 847-639-1469 218-681-3380 402-474-4858 770-436-3030 ____________________________ Features SMA Connectors for All High-Speed I/Os Operational Mode Select Pins Loss-of-Lock LED Single +3.3V Power-Supply Operation Fully Assembled and Tested Note: Please indicate that you are using the MAX3872/MAX3874 when ordering from these suppliers. ______________________________________________________________ Component List DESIGNATION QTY DESCRIPTION 0.1F 10% ceramic capacitors C1-C7, C17- C19, C22, C24, 14 (0402) C26, C28 Murata GRM36X7R104K016A 0.001F 10% ceramic capacitors (0402) C8-C13 6 Murata GRM36X7R102K016A 33F 10% tantalum capacitor C14 1 AVX TAJB336K016 2.2F 10% tantalum capacitor C15 1 AVX TAJB225K016 0.82F ceramic capacitor (0603) (MAX3872EVKIT) C16 1 0.068F ceramic capacitor (0402) (MAX3874EVKIT) D1 1 Red LED D2 1 Not installed R2-R5 4 Not installed R6 1 910 5% resistor (0402) R7 1 Not installed 50k variable resistor R8 1 BOURNS 3296W-203 R9 1 Not installed 56nH inductors (0805) L1-L3 3 Coilcraft CS-560XKBC DESIGNATION QTY J1-J8, J25, J26 J9, J12-J15, J17-J19 J10 J11, J16, J22, J23 J20, J21 J24 J9, J10, J12- J15, J17-J19 U1 10 8 1 4 2 1 9 DESCRIPTION SMA connectors (edge-mount, round-pin) EF JOHNSON 142-0701-851 3-pin headers (0.1in centers) 2-pin headers (0.1in centers) Not installed Test points Digi-Key 5000K-ND Not installed Shunts MAX3872EGJ, 32-pin QFN (MAX3872EVKIT) MAX3874EGJ, 32-pin QFN (MAX3874EVKIT) MAX3872/MAX3874 EV kit circuit board, Rev C MAX3872 datasheet (MAX3872EVKIT) MAX3874 datasheet (MAX3874EVKIT) 1 None 1 None 1 _________________________________________________________________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. MAX3872/MAX3874 Evaluation Kits Evaluate: MAX3872/MAX3874 _______________ Detailed Description The MAX3872/MAX3874 EV Kit is a fully assembled and factory tested demonstration board that enables testing of all MAX3872 and MAX3874 functions. Jitter analysis and product performance can also be observed by appropriately interfacing the EV kit with a bit-error-rate tester (BERT) and a jitter analyzer. Operational Modes The MAX3872/MAX3874 has three modes of operation: normal, system loopback, and clock holdover. The three operational modes are programmed by connecting the appropriate pins of JU13 (SIS) and JU14 (LREF). See Table 1. Normal operation mode requires a serial data stream at the SDI inputs, system loopback mode requires a serial data stream at the SLBI inputs, and clock holdover mode requires a reference clock signal at the SLBI inputs. Test Equipment Required * * * * +3.3V power supply with 200mA current capability Signal-source, 2.7Gbps minimum capability Jitter analyzer capable of 2.7Gbps performance Oscilloscope with at least 3GHz performance Test Equipment Interface The serial inputs (SDI, SLBI) and serial outputs (SDO, SCLKO) have on-board AC-coupling capacitors to allow direct connection to 50 test equipment. The EV kit also has pads on the serial data and clock outputs (SDO, SCLKO) to allow on-board termination for coupling to high-impedance oscilloscopes. Normal and System Loopback Settings Three jumpers (RS1, RS2, RATESET) are available for setting the SDI or SLBI inputs to receive the appropriate data rate (Table 2). The FREFSET pin can be set high or low while in normal or system loopback mode. Quick Start (MAX3872 & MAX3874) This procedure will set up the evaluation board for 2.48832Gbps normal operation mode, with input threshold adjust disabled. 1) Place a shunt across pins 2 (SIS) and 3 (GND) of J13. 2) Place a shunt across pins 1 (VCC) and 2 (LREF) of J14. 3) Place a shunt across pins 2 and 3 of J15. 4) Place a shunt across pins 2 (RS1) and 3 (GND) of J17. 5) Place a shunt across pins 2 (RS2) and 3 (GND) of J18. 6) Place a shunt across pins 2 (RATESET) and 3 (GND) of J19. 7) Place a shunt across pins 1 (VCC) and 2 (VCTRL) of J9. 8) Remove the shunt from J10. 9) Place a shunt across pins 2 (FREFSET) and 3 (GND) of J12. 10) Connect a 2.48832Gbps PRBS NRZ signal to the serial data inputs (SDI) with 50 cables. Leave the SLBI inputs unconnected. 11) Connect the serial data and clock outputs (SDO, SCLKO) to a 50 high-speed oscilloscope. Terminate any unused outputs with 50 to GND. 12) Connect +3.3V to J20 (VCC) and ground to J21 (GND). Clock Frequencies in Holdover Mode Set the incoming reference clock frequency and outgoing serial clock frequency by setting RS1, RS2, RATESET, and FREFSET appropriately. See Table 3. Auto Switch to Clock Holdover Mode To switch from normal mode to clock holdover mode automatically when there are no data transitions applied to the SDI inputs connect LOL directly to LREF by placing a shunt across pins 1 and 2 of J15. Vertical Threshold Adjustment To compensate for optical noise presented on the data logic high caused by EDFAs in a WDM transmission system, an external analog control input is provided for adjusting the data decision threshold to an optimum level. To enable data decision threshold adjustment, place a shunt across pins 2 and 3 of J9 and shunt pins 1 and 2 of J10. Set the decision threshold by adjusting the potentiometer R8. The center point for the decision threshold is 1.2V at the VCTRL pin. Jumpers, Controls, Test Points Table 4 summarises the functions of all jumpers, controls, and test points of the MAX3872/MAX3874 EV Kit. 2 ________________________________________________________________________________________ MAX3872/MAX3874 Evaluation Kits Table 1. Operational Mode Settings MODE Normal System Loopback Clock Holdover Table 2. Data Rate Settings INPUT DATA RATE 2.666Gbps 2.488Gbps/2.5Gbps 1.244Gbps/1.25Gbps* 666.51Mbps* 622.08Mbps* 166.63Mbps* 155.52Mbps* Evaluate: MAX3872/MAX3874 SHUNT POSITIONS LREF (JU14) 1 and 2 1 and 2 2 and 3 SIS (JU13) 2 and 3 1 and 2 (1 and 2) or (2 and 3) SHUNT POSITIONS RS1 2 and 3 2 and 3 1 and 2 2 and 3 2 and 3 1 and 2 1 and 2 RS2 2 and 3 2 and 3 1 and 2 1 and 2 1 and 2 2 and 3 2 and 3 RATESET 1 and 2 2 and 3 2 and 3 1 and 2 2 and 3 1 and 2 2 and 3 *Setting not available on the MAX3874 Table 3. Clock Holdover Frequency Settings REFERENCE CLOCK FREQUENCY 666.51MHz 666.51MHz* 666.51MHz* 622.08MHz/625MHz* 622.08MHz/625MHz 622.08MHz* 622.08MHz* 166.63MHz 166.63MHz* 166.63MHz* 155.52MHz/156.25MHz* 155.52MHz/156.25MHz 155.52MHz* 155.52MHz* *Setting not available on the MAX3874 SCLKO FREQUENCY 2.666GHz 666.51MHz 166.63MHz 1.244GHz/1.25GHz 2.488GHz/2.5GHz 622.08MHz 155.52MHz 2.666GHz 666.51MHz 166.63MHz 1.244GHz/1.25GHz 2.488GHz/2.5GHz 622.08MHz 155.52MHz SHUNT POSITIONS RS1 2 and 3 2 and 3 1 and 2 1 and 2 2 and 3 2 and 3 1 and 2 2 and 3 2 and 3 1 and 2 1 and 2 2 and 3 2 and 3 1 and 2 RS2 2 and 3 1 and 2 2 and 3 1 and 2 2 and 3 1 and 2 2 and 3 2 and 3 1 and 2 2 and 3 1 and 2 2 and 3 1 and 2 2 and 3 RATESET 1 and 2 1 and 2 1 and 2 2 and 3 2 and 3 2 and 3 2 and 3 1 and 2 1 and 2 1 and 2 2 and 3 2 and 3 2 and 3 2 and 3 FREFSET 2 and 3 2 and 3 2 and 3 2 and 3 2 and 3 2 and 3 2 and 3 1 and 2 1 and 2 1 and 2 1 and 2 1 and 2 1 and 2 1 and 2 _________________________________________________________________________________________ 3 MAX3872/MAX3874 Evaluation Kits Evaluate: MAX3872/MAX3874 Table 4. Jumpers, Controls, Test Points NAME J9 TYPE 3 Pin Header DESCRIPTION Enables/disables threshold adjust. Shunt is required on J10 when threshold adjust is enabled. Connects VREF to VCTRL through R8 when threshold adjust is enabled. Not installed Sets the reference clock frequency Selects between SDI and SLBI inputs Enables/disables clock holdover mode Connects LOL to LREF for automatic clock holdover mode or provides connection of J14 to LREF input. Not installed Multi-Rate Select Input 1 Multi-Rate Select Input 2 VCO Select Input Power supply connection to VCC. Power supply connection to GND. Not installed Not installed Not installed Threshold Control Potentiometer. Used in conjunction with J10 and J9 to set the SDI input threshold. NORMAL POSITION Shunt pins 1 and 2 Threshold control disabled Open -- Shunt pins 2 and 3 See Tables 2 and 3 Shunt pins 2 and 3 See Table 1 Shunt pins 1 and 2 See Table 1 Shunt pins 2 and 3 LOL not connected to LREF Open Shunt pins 2 and 3 See Tables 2 and 3 Shunt pins 2 and 3 See Tables 2 and 3 Shunt pins 2 and 3 See Tables 2 and 3 Connected to VCC Connected to GND Open Open -- -- J10 J11 J12 J13 J14 J15 J16 J17 J18 J19 J20 J21 J22 J23 J24 R8 2 Pin Header 3 Pin Header 3 Pin Header 3 Pin Header 3 Pin Header 3 Pin Header 2 Pin Header 3 Pin Header 3 Pin Header 3 Pin Header Test Point Test Point 2 Pin Header 2 Pin Header Test Point Potentiometer 4 ________________________________________________________________________________________ MAX3872/MAX3874 Evaluation Kits J20 VCC L1 56nH C5 0.1 F C8 1000pF C11 1000pF VCC_OUT C14 33 F C15 2.2 F VCC_VCO Evaluate: MAX3872/MAX3874 L2 56nH C6 0.1 F C9 1000pF C12 1000pF VCC J21 GND L3 56nH C7 0.1 F C10 1000pF C13 1000pF J24 R8 50k VCC J9 J10 R9 O PEN J22 C17 0.1 F VCC VCC J11 J12 VCC_O UT J23 R2 O PEN C22 0.1 F J5 SDO+ 32 31 30 29 28 27 26 25 CAZ- VCTRL CAZ+ G ND VCC J1 SDI+ C1 0.1 F FREFSET VREF G ND VCC_O UT VCC_OUT 24 23 22 21 20 19 18 17 VCC_VCO VCC_O UT VCC_VCO VCC_OUT VCC_O UT R3 O PEN C24 0.1 F VCC 1 2 3 VCC SDI+ SDIU1 VCC SLBI+ SLBISIS VCC_VCO LREF GND GND LOL FIL VCC_O UT SDO+ SDOVCC_O UT J6 SDO- J2 SDI- C2 0.1 F VCC J3 SLBI+ C3 0.1 F 4 5 6 7 8 M AX3872 SCLKO+ SCLKOVCC_VCO RATESET GND RS1 RS2 R4 O PEN C26 0.1 F J7 SCLKO+ J4 SLBI- C4 0.1 F VCC R5 O PEN C28 0.1 F J8 SCLKO- 10 11 12 13 14 15 VCC_VCO J14 VCC J16 R6 910 D1 R7 OPEN D2 OPEN C16 0.82 F VCC_VCO J17 VCC_VCO J15 16 VCC 9 J13 J19 VCC J18 J25 C18 0.1 F C19 0.1 F J26 Figure 1. MAX3872 EV Kit Schematic _________________________________________________________________________________________ 5 MAX3872/MAX3874 Evaluation Kits J20 VCC L1 56nH C5 0.1 F C8 1000pF C11 1000pF VCC_OUT C14 33 F C15 2.2 F VCC_VCO Evaluate: MAX3872/MAX3874 L2 56nH C6 0.1 F C9 1000pF C12 1000pF VCC J21 GND L3 56nH C7 0.1 F C10 1000pF C13 1000pF J24 R8 50k VCC J9 J10 R9 O PEN J22 C17 0.1 F VCC VCC J11 J12 VCC_O UT J23 R2 O PEN C22 0.1 F J5 SDO+ 32 31 30 29 28 27 26 25 CAZ- VCTRL CAZ+ G ND J1 SDI+ C1 0.1 F FREFSET VREF G ND VCC VCC_O UT VCC_OUT 24 23 22 21 20 19 18 17 VCC_VCO VCC_O UT VCC_VCO VCC_OUT VCC_O UT R3 O PEN C24 0.1 F VCC 1 2 3 VCC SDI+ SDIU1 VCC SLBI+ SLBISIS VCC_VCO LREF GND GND LOL FIL VCC_O UT SDO+ SDOVCC_O UT J6 SDO- J2 SDI- C2 0.1 F VCC J3 SLBI+ C3 0.1 F 4 5 6 7 8 M AX3874 SCLKO+ SCLKOVCC_VCO RATESET GND RS1 RS2 R4 O PEN C26 0.1 F J7 SCLKO+ J4 SLBI- C4 0.1 F VCC R5 O PEN C28 0.1 F J8 SCLKO- 10 11 12 13 14 15 VCC_VCO J14 VCC J16 R6 910 D1 R7 OPEN D2 OPEN C16 0.068 F VCC_VCO J17 VCC_VCO J15 16 VCC 9 J13 J19 VCC J18 J25 C18 0.1 F C19 0.1 F J26 Figure 2. MAX3874 EV Kit Schematic 6 ________________________________________________________________________________________ MAX3872/MAX3874 Evaluation Kits Evaluate: MAX3872/MAX3874 Figure 3. MAX3872/MAX3874 EV Kit Component Placement Guide--Component Side Figure 4. MAX3872/MAX3874 EV Kit PC Board Layout-- Component Side Figure 5. MAX3872/MAX3874 EV Kit PC Board Layout-- Ground Plane _________________________________________________________________________________________ 7 MAX3872/MAX3874 Evaluation Kits Evaluate: MAX3872/MAX3874 Figure 6. MAX3872/MAX3874 EV Kit PC Board Layout-- Power Plane Figure 7. MAX3872/MAX3874 EV Kit 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. 8 ___________________ Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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