19-2070; Rev 0; 6/01 MAX3930 Evaluation Kit The MAX3930 evaluation kit (EV kit) is an assembled demonstration board that provides electrical evaluation of the MAX3930 10.7Gbps laser driver. The output of the evaluation board is interfaced to an SMA connector that can be connected to a 50Ω terminated oscilloscope. Features ♦ Fully Assembled and Tested ♦ Fully Matched for Best Return Loss Ordering Information PART TEMP. RANGE IC PACKAGE MAX3930EVKIT -40°C to +85°C Chip On Board Component List DESIGNATION QTY C1, C2, C3, C6, C7, C17, C18 7 1000pF ±10% ceramic capacitors (0201) Murata GRM33X3R102K016A C4, C5 2 0.01µF ±10% ceramic capacitors (0201) Panasonic EJC-ZEBOJ103K C8, C10, C12, C13, C14 5 DESCRIPTION 0.01µF 10% ceramic capacitors (0402) Murata GRM36X7R103K016A C9, C11 2 10µF ±10% tantalum capacitors AVX TAJB106K010 C15 1 100pF ±10% ceramic capacitor (0201) Murata GRM33X7R101K010A C16 0 Not installed R1 1 2kΩ variable resistor Bourns 3296W-202 or Digi-Key 3296W-202-ND R2, R3, R9, R10 4 4.99kΩ ±1% resistors (0402) R4, R11 2 15kΩ ±1% resistors (0402) 2 200kΩ variable resistors Bourns 3296W-204 or Digi-Key 3296W-204-ND R5, R12 DESIGNATION QTY DESCRIPTION R17, R18 2 100Ω ±1% resistors (0402) L1, L2 2 220nH inductors Coilcraft 0805CS-221XKBC MAX3930E/D (die) 81X46 U1 1 U2, U3 2 MAX480ESA 8-pin SOs U4 1 J3–J7 5 MAX6190AESA 8-pin SO SMA connectors (edge-mount) TP1, TP3–TP12, J1, J2, J8 14 Test points Digi-Key 5000K-ND JU1, JU2 2 1×2 pin headers (0.1in centers) Digi-Key S1012-36-ND JU1, JU2 2 Shunts Digi-Key S9000-ND None 1 MAX3930 Rev C EV kit circuit board None 1 MAX3930 EV kit data sheet None 1 MAX3930 data sheet Component Suppliers PHONE FAX AVX SUPPLIER 843-444-2863 843-626-3123 1 15Ω ±1% resistor (0402) Coilcraft 847-639-6400 847-639-1469 Digi-Key 218-681-6674 218-681-3380 R7, R8 2 66.5Ω ±1% resistors (0402) Note: R7 and R8 will be installed with resistive material facing down on the circuit board. EFJohnson 402-474-4800 402-474-4858 Murata 415-964-6321 415-964-8165 R13, R14 2 49.9Ω ±1% resistors (0402) R15, R16 0 Not installed R6 Note: Please indicate that you are using the MAX3930 when contacting these component suppliers. ________________________________________________________________ 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 Evaluates: MAX3930 General Description Evaluates: MAX3930 MAX3930 Evaluation Kit Quick Start 1) If the data is to be latched, place shunt on JU1 to enable clock input; otherwise, leave JU1 open. 2) Install shunt JU2 to enable the outputs. 3) Adjust R5 and R12 to their full counter-clockwise positions. 4) Adjust R1 to the approximate center of the adjustment range. 5) Apply a differential input signal (max amplitude ≤800mV per side, common-mode voltage = 0) to J3 and J4 (DATA+ and DATA-). 7) Attach a high-speed oscilloscope with 50Ω inputs to J7. For optimum performance, see the interconnect recommendations below. 8) Power up the board with a -5V supply and a -2V supply. 9) Adjust R5 clockwise until the desired laser modulation current is achieved. 10) Adjust R1 For 50% eye crossing: IMOD = Output Amplitude (Volts) 20Ω 6) If the latch is enabled, apply a differential clock signal (max amplitude ≤800mV per side, commonmode voltage = 0) to J5 and J6 (CLK+ and CLK-). Adjustment and Control Descriptions (see Quick Start first) COMPONENT NAME FUNCTION JU1 RETIMING ENABLE JU2 MODULATION ENABLE Enables/disables the modulation outputs. Shunt for normal operation. Remove shunt to switch modulation output off. R1 PULSE-WIDTH ADJUST Pulse-Width Control. Adjusts the pulse width. R5 MOD ADJUST Adjusts the laser modulation current. R12 BIAS ADJUST Adjusts the laser bias current. Enables/disables data retiming. Shunt to enable data retiming. Remove shunt for direct data transmission. Recommendations for Interconnect Between the MAX3930 EV Kit and an Oscilloscope 1) Use a high-bandwidth sampling oscilloscope such as the Tektronix CSA8000 mainframe with an 80E01 50GHz sampling head. The 80E03 and 80E04 20GHz sampling heads are not recommended. 2) A high-quality SMA attenuator (14dB or 20dB) is required to reduce the signal level for compatibility with the sampling head. The attenuator should be 2 connected directly to the output SMA connector on the EV kit to minimize transmission-line reflections. 3) The total path length from the EV kit to the oscilloscope must to be minimized. If possible, connect the female connector of the attenuator to the female input of the oscilloscope with an SMA adapter. If cables must be used, a 0.141in semi-rigid 50Ω coaxial cable with high-quality SMA connectors is recommended (example: Tektronix 015-1015-00). _______________________________________________________________________________________ MAX3930 Evaluation Kit MAX480 R11 15kΩ CW R12 200kΩ R9 4.99kΩ TP7 76 3 2 U3 4 1 5 R10 4.99kΩ VEE TP8 C13 0.01µF R13 49.9Ω L2 220nH -2V C11 10µF C7 1000pF OUT 6 2 IN VM U4 N.C. MAX6190 GND 4 37 36 VEE R14 49.9Ω 35 34 33 VEE 32 31 VEE C10 J8 0.01µF C6 1000pF N.C. GND VEE VEE VREF BIASSET C9 10µF BIASMON J2 C8 0.01µF C16 OPEN VEE VEE VEE VEE L1 220nH VEE -5V R18 100Ω VEE R16 OPEN VEE J1 Evaluates: MAX3930 TP9 VREF TP6 1 J3 2 J4 VCC 3 V TT VCC 29 4 DATA- VCC 28 5 VCC J5 U1 MOD1 26 MAX3930 7 VTT TP1 MODN1 27 6 CLK+ J6 R6 15Ω BIAS 30 DATA+ OUTPUT J7 8 CLK- C1 1000pF VEE 9 V CC MOD2 25 10 VEE MODN2 24 11 V EE VCC R1 2kΩ 15 16 JU2 VEE TP10 TP12 TP11 17 18 VEE C5 0.01µF C18 1000pF 22 R4 15kΩ R2 4.99kΩ VEE MODSET C3 1000pF C2 1000pF R15 OPEN 2 1 3 R17 100Ω VEE 4 U2 6 7 VEE TP5 R3 4.99kΩ VEE C15 100pF VEE C12 0.01µF TP3 TP4 VEE C4 0.01µF VM 20 21 19 VEE C14 0.01µF VREF MODMON VEE VEE PWC- MODEN 14 PWC+ R5 200kΩ R8 66.5Ω 13 RTEN VEE CW C17 1000pF VCC 23 12 VCC JU1 R7 66.5Ω MAX480 Figure 1. MAX3930 EV Kit Schematic _______________________________________________________________________________________ 3 Evaluates: MAX3930 MAX3930 Evaluation Kit 1.0" Figure 2. MAX3930 EV Kit Component Placement Guide—Component Side 1.0" Figure 3. MAX3930 EV Kit PC Board Layout—Component Side 4 _______________________________________________________________________________________ MAX3930 Evaluation Kit Evaluates: MAX3930 1.0" Figure 4. MAX3930 EV Kit PC Board Layout—Ground Plane 1.0" Figure 5. MAX3930 EV Kit PC Board Layout—Power Plane _______________________________________________________________________________________ 5 Evaluates: MAX3930 MAX3930 Evaluation Kit 1.0" Figure 6. MAX3930 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. 6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.