19-2069; Rev 0; 6/01 MAX3935 Evaluation Kit Features ♦ Fully Assembled and Tested ♦ Fully Matched for Best Return Loss Ordering Information PART TEMP. RANGE IC PACKAGE MAX3935EVKIT -40°C to +85°C 32 QFN-EP* *Exposed pad Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY C2, C5, C7, C19–C22 7 1000pF 10% ceramic capacitors (0201) Murata GRM33X5R102K016A L4 1 EMI ferrite bead Murata BLM11HA601SG C3, C8, C12, C13, C14, C17, C18, C25, C26 9 0.01µF 10% ceramic capacitors (0402) Murata GRM36X5R103K016A 1 C4, C9 2 10µF ±10% tantalum capacitors AVX TAJC106K016 MAX3935EGJ 32-pin QFN Note: U1 has an exposed paddle which requires it to be solder attached to the circuit board to insure proper functionality of part. C15 1 100pF 5% ceramic capacitor (0402) Murata GRM36COG101J050A C16 1 Not installed R1, R15, R16, R21, R22 5 4.99kΩ ±1% resistors (0402) R13 1 2kΩ potentiometer Digi-Key 3296W-202-ND R14 1 Not installed R17, R23 2 15kΩ ±1% resistors (0402) R18, R24 2 200kΩ potentiometers Digi-Key 3296W-204-ND R19, R25 2 Not installed R20, R26 2 100Ω ±1% resistors (0402) R27, R29 2 49.9Ω ±1% resistors (0402) 2 220nH inductors Coilcraft 0805CS-221XKBC L1, L3 U1 DESCRIPTION U2, U3 2 MAX480ESA 8-pin SO U4 1 MAX6190AESA 8-pin SO JU1, JU2 2 1 × 2 pin headers (0.1in centers) Digi-Key S1012-36-ND J1–J4, J9 5 SMA edge-mount connectors (tab contact) EFJohnson 142-0701-851 Note: Insure that there is a continuous connection from the ground plane to the body of the connector when soldering. J5, J6, J7, TP2–TP12 14 Test points, Digi-Key 5000K-ND JU1, JU2 2 Shunts, Digi-Key S9000-ND None MAX3935 Rev B evaluation circuit board None MAX3935 EV kit data sheet None MAX3935 data sheet ________________________________________________________________ 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: MAX3935 General Description The MAX3935 evaluation kit (EV kit) is an assembled demonstration board that enables electrical evaluation of the 10.7Gbps EAM driver. The output of the evaluation board is interfaced to an SMA connector, which can be connected to a 50Ω terminated oscilloscope. Evaluates: MAX3935 MAX3935 Evaluation Kit Component Suppliers SUPPLIER PHONE FAX AVX 843-444-2863 843-626-3123 Coilcraft 847-639-6400 847-639-1469 Digi-Key 218-681-6674 218-681-3380 EFJohnson 402-474-4800 402-474-4858 Murata 415-964-6321 415-964-8165 Note: Please indicate that you are using the MAX3935 when contacting these component suppliers. Quick Start 1) If the data is to be latched, place shunt on JU2 to enable clock input. Otherwise, leave JU2 open. 2) Install shunt JU1 to enable the outputs. 3) Adjust R18 to the full counter-clockwise position. 4) Adjust R24 to the full counter-clockwise position. 5) Adjust R13 to the approximate center of the adjustment range. 6) Apply a differential input signal (max amplitude ≤ 800mV per side) to J1 and J2 (DATA+ and DATA-). 7) If the latch is enabled, apply a differential clock signal (max amplitude ≤ 800mV per side) to J3 and J4 (CLK+ and CLK-). For optimum performance, see the interconnect recommendations. 8) Attach a high-speed oscilloscope with 50Ω inputs to J9. (Note: Attenuation may be required as voltage levels may exceed 4V.) See the interconnect recommendations below. 9) Set VTT to 0V. Power up the board with VEE at -5.2V. 10) Adjust R18 clockwise until the desired EAM modulation voltage is achieved. 11) Adjust R24 clockwise for the desired DC bias. Be careful not to exceed the compliance range of the modulation source as given by: VMOD (Pin 20) ≥ VEE + 1.55V Recommendations for Interconnect Between the MAX3935 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 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 oscillscope must 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). Adjustment and Control Descriptions (see Quick Start first) 2 COMPONENT NAME FUNCTION JU2 RETIMING ENABLE Enables/disables data retiming. Shunt to enable data retiming. Remove shunt for direct data transmission. JU1 MODULATION ENABLE Enables/disables the modulation outputs. Shunt for normal operation. Remove shunt to disable switching of the modulation output. R13 PWC ADJUST Adjusts the EAM pulse width. R18 MOD ADJUST Adjusts the EAM modulation current. R24 BIAS ADJUST Adjusts the EAM bias current. _______________________________________________________________________________________ MAX3935 Evaluation Kit TP9 R23 15kΩ CW R21 MAX480 5kΩ 3 7 + 2 U3 - 5 6 1 R24 200kΩ TP8 R22 5kΩ VEE VEE C5 1000pF L3 220nH VEE R26 100Ω C13 0.01µF CW J7 TP7 R25 OPEN VEE C16 OPEN VTT VEE VEE VTT C4 10µF R29 49.9Ω R1 5kΩ JU1 TP12 2 J1 3 C26 0.01µF 4 C7 1000pF 7 C21 1000pF 25 26 BIAS BIASSET 27 28 MODN1 MAX3935 MOD CLK+ MODN2 CLK- GND MODSET L1 220nH TP6 20 19 18 C19 1000pF CW IN OUT 6 VEE R20 100Ω TP3 VREF VREF VEE MAX6190 VEE R19 OPEN VEE C15 100pF CW TP10 U4 17 C12 0.01µF TP2 -5.2V GND OUTPUT J9 C2 1000pF VEE 2 21 VEE CW J6 C20 1000pF VEE 22 N.C. VEE R13 2kΩ R27 49.9Ω C9 10µF 23 16 15 MODMON 14 VEE 13 12 VEE GND VTT 11 8 C18 0.01µF C8 0.01µF L4 BLM11HA601SG 24 VTT 9 J4 U1 PWC- C17 0.01µF VEE 29 VEE 30 31 GND VTT 6 J3 CLK- DATAVTT 5 C14 0.01µF CLK+ N.C. VEE VTT J2 R14 OPEN DATA+ 10 DATA- BIASMON VTT GND 1 MODEN RTEN VEE C25 0.01µF DATA+ 32 VTT C22 1000pF J5 TP11 JU2 PWC+ C3 0.01µF Evaluates: MAX3935 VREF 2 R17 15kΩ 3 R18 200kΩ TP4 R16 5kΩ GND R15 5kΩ 1 + 5 U2 4 VEE 6 7 MAX480 TP5 4 VEE VEE VEE Figure 1. MAX3935 EV Kit Schematic _______________________________________________________________________________________ 3 Evaluates: MAX3935 MAX3935 Evaluation Kit 1.0" Figure 2. MAX3935 EV Kit Component Placement Guide—Component Side 1.0" Figure 3. MAX3935 EV Kit PC Board Layout—Component Side 4 _______________________________________________________________________________________ MAX3935 Evaluation Kit Evaluates: MAX3935 1.0" Figure 4. MAX3935 EV Kit PC Board Layout—Ground Plane 1.0" Figure 5. MAX3935 EV Kit PC Board Layout—Power Plane _______________________________________________________________________________________ 5 Evaluates: MAX3935 MAX3935 Evaluation Kit 1.0" Figure 6. MAX3935 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.