19-2767; Rev 0, 2/03 MAX3872/MAX3874 Evaluation Kits 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 50Ω test equipment. ____________________________ 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 ______________ Ordering Information PART MAX3872EVKIT MAX3874EVKIT TEMP. RANGE -40°C to +85°C -40°C to +85°C IC PACKAGE 32 QFN 32 QFN ______________Component Suppliers SUPPLIER PHONE FAX AVX 843-448-9411 843-626-3123 Coilcraft 847-639-6400 847-639-1469 Digi-Key 800-344-4539 218-681-3380 EF Johnson 402-474-4800 402-474-4858 Murata 770-436-1300 770-436-3030 Note: Please indicate that you are using the MAX3872/MAX3874 when ordering from these suppliers. ______________________________________________________________ Component List DESIGNATION QTY DESCRIPTION 0.1µF ±10% ceramic capacitors C1–C7, C17– C19, C22, C24, 14 (0402) C26, C28 Murata GRM36X7R104K016A 0.001µF ±10% ceramic capacitors (0402) C8–C13 6 Murata GRM36X7R102K016A 33µF ±10% tantalum capacitor C14 1 AVX TAJB336K016 2.2µF ±10% tantalum capacitor C15 1 AVX TAJB225K016 0.82µF ceramic capacitor (0603) (MAX3872EVKIT) C16 1 0.068µF ceramic capacitor (0402) (MAX3874EVKIT) D1 1 Red LED D2 1 Not installed R2–R5 4 Not installed R6 1 910Ω ±5% resistor (0402) R7 1 Not installed 50kΩ 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 10 DESCRIPTION SMA connectors (edge-mount, round-pin) EF JOHNSON 142-0701-851 J9, J12–J15, J17–J19 J10 J11, J16, J22, J23 8 3-pin headers (0.1in centers) 1 2-pin headers (0.1in centers) 4 Not installed J20, J21 2 J24 J9, J10, J12– J15, J17–J19 1 Test points Digi-Key 5000K-ND Not installed 9 Shunts U1 1 None 1 None 1 MAX3872EGJ, 32-pin QFN (MAX3872EVKIT) MAX3874EGJ, 32-pin QFN (MAX3874EVKIT) MAX3872/MAX3874 EV kit circuit board, Rev C MAX3872 datasheet (MAX3872EVKIT) MAX3874 datasheet (MAX3874EVKIT) _________________________________________________________________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 Evaluate: MAX3872/MAX3874 ________________ General Description Evaluate: MAX3872/MAX3874 MAX3872/MAX3874 Evaluation Kits _______________ 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. 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 50Ω 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. 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 50Ω cables. Leave the SLBI± inputs unconnected. 11) Connect the serial data and clock outputs (SDO±, SCLKO±) to a 50Ω high-speed oscilloscope. Terminate any unused outputs with 50Ω to GND. 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. 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. 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. 12) Connect +3.3V to J20 (VCC) and ground to J21 (GND). 2 ________________________________________________________________________________________ MAX3872/MAX3874 Evaluation Kits Table 2. Data Rate Settings SHUNT POSITIONS MODE LREF (JU14) SIS (JU13) Normal 1 and 2 2 and 3 System Loopback 1 and 2 1 and 2 Clock Holdover 2 and 3 (1 and 2) or (2 and 3) INPUT DATA RATE SHUNT POSITIONS RS1 RS2 RATESET 2.666Gbps 2 and 3 2 and 3 1 and 2 2.488Gbps/2.5Gbps 2 and 3 2 and 3 2 and 3 1.244Gbps/1.25Gbps* 1 and 2 1 and 2 2 and 3 666.51Mbps* 2 and 3 1 and 2 1 and 2 622.08Mbps* 2 and 3 1 and 2 2 and 3 166.63Mbps* 1 and 2 2 and 3 1 and 2 155.52Mbps* 1 and 2 2 and 3 2 and 3 *Setting not available on the MAX3874 Table 3. Clock Holdover Frequency Settings REFERENCE CLOCK FREQUENCY SCLKO FREQUENCY SHUNT POSITIONS RS1 RS2 RATESET FREFSET 666.51MHz 2.666GHz 2 and 3 2 and 3 1 and 2 2 and 3 666.51MHz* 666.51MHz 2 and 3 1 and 2 1 and 2 2 and 3 666.51MHz* 166.63MHz 1 and 2 2 and 3 1 and 2 2 and 3 622.08MHz/625MHz* 1.244GHz/1.25GHz 1 and 2 1 and 2 2 and 3 2 and 3 622.08MHz/625MHz 2.488GHz/2.5GHz 2 and 3 2 and 3 2 and 3 2 and 3 622.08MHz* 622.08MHz 2 and 3 1 and 2 2 and 3 2 and 3 622.08MHz* 155.52MHz 1 and 2 2 and 3 2 and 3 2 and 3 166.63MHz 2.666GHz 2 and 3 2 and 3 1 and 2 1 and 2 166.63MHz* 666.51MHz 2 and 3 1 and 2 1 and 2 1 and 2 166.63MHz* 166.63MHz 1 and 2 2 and 3 1 and 2 1 and 2 155.52MHz/156.25MHz* 1.244GHz/1.25GHz 1 and 2 1 and 2 2 and 3 1 and 2 155.52MHz/156.25MHz 2.488GHz/2.5GHz 2 and 3 2 and 3 2 and 3 1 and 2 155.52MHz* 622.08MHz 2 and 3 1 and 2 2 and 3 1 and 2 155.52MHz* 155.52MHz 1 and 2 2 and 3 2 and 3 1 and 2 *Setting not available on the MAX3874 _________________________________________________________________________________________ 3 Evaluate: MAX3872/MAX3874 Table 1. Operational Mode Settings Evaluate: MAX3872/MAX3874 MAX3872/MAX3874 Evaluation Kits Table 4. Jumpers, Controls, Test Points NAME TYPE DESCRIPTION NORMAL POSITION J9 3 Pin Header Enables/disables threshold adjust. Shunt is required on J10 when threshold adjust is enabled. J10 2 Pin Header Connects VREF to VCTRL through R8 when threshold adjust is enabled. J11 3 Pin Header Not installed J12 3 Pin Header Sets the reference clock frequency Shunt pins 2 and 3 See Tables 2 and 3 J13 3 Pin Header Selects between SDI and SLBI inputs Shunt pins 2 and 3 See Table 1 J14 3 Pin Header Enables/disables clock holdover mode Shunt pins 1 and 2 See Table 1 J15 3 Pin Header Connects LOL to LREF for automatic clock holdover mode or provides connection of J14 to LREF input. J16 2 Pin Header Not installed J17 3 Pin Header Multi-Rate Select Input 1 Shunt pins 2 and 3 See Tables 2 and 3 J18 3 Pin Header Multi-Rate Select Input 2 Shunt pins 2 and 3 See Tables 2 and 3 J19 3 Pin Header VCO Select Input Shunt pins 2 and 3 See Tables 2 and 3 J20 Test Point Power supply connection to VCC. Connected to VCC J21 Test Point Power supply connection to GND. Connected to GND J22 2 Pin Header Not installed Open J23 2 Pin Header Not installed Open J24 Test Point Not installed — R8 Potentiometer Threshold Control Potentiometer. Used in conjunction with J10 and J9 to set the SDI input threshold. — Shunt pins 1 and 2 Threshold control disabled Open — Shunt pins 2 and 3 LOL not connected to LREF Open 4 ________________________________________________________________________________________ MAX3872/MAX3874 Evaluation Kits VCC_VCO J20 C14 33 µ F C15 2.2 µ F L2 56nH C5 0.1 µ F C8 1000pF C6 0.1 µ F C9 1000pF Evaluate: MAX3872/MAX3874 L1 56nH VCC C11 1000pF VCC_OUT C12 1000pF VCC J21 L3 56nH GND C7 0.1 µ F C17 0.1 µ F R9 O PEN J24 C10 1000pF VCC C13 1000pF VCC J22 R8 50k Ω J11 VCC J12 VCC_O UT J10 J9 J23 R2 O PEN C22 0.1 µ F J5 5 VCC R6 910 Ω R7 OPEN 25 SDO- G ND 21 VCC_OUT VCC_O UT R4 O PEN 20 19 18 C26 0.1 µ F J7 SCLKO+ VCC_VCO VCC_O UT GND 17 R5 O PEN C28 0.1 µ F J8 SCLKO- J19 J18 VCC_VCO J6 22 C16 0.82 µ F D1 C24 0.1 µ F 16 RS2 15 23 VCC_VCO VCC_VCO J16 VCC 26 27 RS1 LOL 9 RATESET J15 J14 FREFSET CAZ+ VCC 28 29 CAZ- VCC_VCO LREF J13 VCC 30 SCLKO- SIS 8 VCC 31 SLBI- 7 SLBI- SCLKO+ 14 J4 6 C4 0.1 µ F M AX3872 SLBI+ VCC_VCO SLBI+ VCC_O UT VCC 13 C3 0.1 µ F SDOU1 FIL J3 SDI- 4 12 VCC GND SDI- SDO+ R3 O PEN 24 VCC_VCO 3 VCC_O UT VCC_OUT VCC_O UT SDI+ 11 J2 VCC 2 C2 0.1 µ F VREF 1 SDI+ VCTRL VCC GND C1 0.1 µ F 10 J1 G ND 32 SDO+ J25 C18 0.1 µ F C19 0.1 µ F J26 J17 D2 OPEN Figure 1. MAX3872 EV Kit Schematic _________________________________________________________________________________________ 5 VCC_VCO J20 L1 56nH VCC C14 33 µ F C15 2.2 µ F L2 56nH C5 0.1 µ F C8 1000pF C6 0.1 µ F C9 1000pF C11 1000pF VCC_OUT C12 1000pF VCC J21 L3 56nH GND C7 0.1 µ F C17 0.1 µ F R9 O PEN J24 C10 1000pF VCC C13 1000pF VCC J22 R8 50k Ω J11 VCC J12 VCC_O UT J10 J9 J23 R2 O PEN C22 0.1 µ F J5 5 VCC R6 910 Ω R7 OPEN 25 SDO- G ND 21 VCC_OUT VCC_O UT R4 O PEN 20 19 18 C26 0.1 µ F J7 SCLKO+ VCC_VCO VCC_O UT GND 17 R5 O PEN C28 0.1 µ F J25 J8 SCLKO- J19 J18 VCC_VCO J6 22 C16 0.068 µ F D1 C24 0.1 µ F 16 RS2 15 23 VCC_VCO VCC_VCO J16 VCC 26 27 RS1 LOL RATESET J15 J14 FREFSET CAZ+ VCC 28 29 CAZ- 30 VCC_VCO LREF J13 VCC VREF SCLKO- SIS 8 VCC 31 SLBI- 7 SLBI- SCLKO+ 14 J4 6 C4 0.1 µ F M AX3874 SLBI+ VCC_VCO SLBI+ VCC_O UT VCC 13 C3 0.1 µ F SDOU1 FIL J3 SDI- 4 12 VCC GND SDI- SDO+ R3 O PEN 24 VCC_VCO 3 VCC_O UT VCC_OUT VCC_O UT SDI+ 11 J2 VCC 2 C2 0.1 µ F VCTRL 1 SDI+ GND VCC 10 J1 C1 0.1 µ F G ND 32 SDO+ 9 Evaluate: MAX3872/MAX3874 MAX3872/MAX3874 Evaluation Kits C18 0.1 µ F J17 D2 OPEN Figure 2. MAX3874 EV Kit Schematic 6 ________________________________________________________________________________________ C19 0.1 µ F J26 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 Evaluate: MAX3872/MAX3874 MAX3872/MAX3874 Evaluation Kits 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.