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| 19-2069; Rev 0; 6/01 MAX3935 Evaluation Kit 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 50 terminated oscilloscope. o Fully Assembled and Tested o Fully Matched for Best Return Loss Features Evaluates: MAX3935 Ordering Information PART MAX3935EVKIT TEMP. RANGE -40C to +85C IC PACKAGE 32 QFN-EP* *Exposed pad Component List DESIGNATION C2, C5, C7, C19-C22 C3, C8, C12, C13, C14, C17, C18, C25, C26 C4, C9 C15 C16 R1, R15, R16, R21, R22 R13 R14 R17, R23 R18, R24 R19, R25 R20, R26 R27, R29 L1, L3 QTY 7 DESCRIPTION 1000pF 10% ceramic capacitors (0201) Murata GRM33X5R102K016A 0.01F 10% ceramic capacitors (0402) Murata GRM36X5R103K016A 10F 10% tantalum capacitors AVX TAJC106K016 100pF 5% ceramic capacitor (0402) Murata GRM36COG101J050A Not installed 4.99k 1% resistors (0402) 2k potentiometer Digi-Key 3296W-202-ND Not installed 15k 1% resistors (0402) 200k potentiometers Digi-Key 3296W-204-ND Not installed 100 1% resistors (0402) 49.9 1% resistors (0402) 220nH inductors Coilcraft 0805CS-221XKBC None None J5, J6, J7, TP2-TP12 JU1, JU2 None 14 2 U2, U3 U4 JU1, JU2 2 1 2 DESIGNATION L4 QTY 1 DESCRIPTION EMI ferrite bead Murata BLM11HA601SG 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. MAX480ESA 8-pin SO MAX6190AESA 8-pin SO 1 x 2 pin headers (0.1in centers) Digi-Key S1012-36-ND 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. Test points, Digi-Key 5000K-ND Shunts, Digi-Key S9000-ND MAX3935 Rev B evaluation circuit board MAX3935 EV kit data sheet MAX3935 data sheet 9 U1 1 2 1 1 5 1 1 2 2 2 2 2 2 J1-J4, J9 5 ________________________________________________________________ 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. MAX3935 Evaluation Kit Evaluates: MAX3935 Component Suppliers SUPPLIER AVX Coilcraft Digi-Key EFJohnson Murata PHONE 843-444-2863 847-639-6400 218-681-6674 402-474-4800 415-964-6321 FAX 843-626-3123 847-639-1469 218-681-3380 402-474-4858 415-964-8165 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 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 50 inputs to J9. (Note: Attenuation may be required as voltage levels may exceed 4V.) See the interconnect recommendations below. 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 50 coaxial cable with high-quality SMA connectors is recommended (example: Tektronix 015-1015-00). Adjustment and Control Descriptions (see Quick Start first) COMPONENT JU2 JU1 R13 R18 R24 NAME RETIMING ENABLE MODULATION ENABLE PWC ADJUST MOD ADJUST BIAS ADJUST FUNCTION Enables/disables data retiming. Shunt to enable data retiming. Remove shunt for direct data transmission. Enables/disables the modulation outputs. Shunt for normal operation. Remove shunt to disable switching of the modulation output. Adjusts the EAM pulse width. Adjusts the EAM modulation current. Adjusts the EAM bias current. 2 _______________________________________________________________________________________ MAX3935 Evaluation Kit Evaluates: MAX3935 VREF CW R24 200k R23 15k TP9 TP8 R22 5k R21 MAX480 5k 3 7 + 2 U3 - 56 1 R25 OPEN TP7 VEE C13 0.01F R26 100 C16 OPEN VEE VEE VEE CW C5 1000pF J7 VTT C3 0.01F L3 220nH VTT VEE C4 10F JU1 JU2 32 31 30 29 28 27 26 25 VTT C22 1000pF DATA+ J1 C26 0.01F C7 1000pF C14 0.01F C25 0.01F VEE 1 2 3 VTT 4 5 6 7 C21 1000pF VTT MODMON MODSET 8 PWC+ PWCVTT VEE N.C. 17 GND VTT VTT R14 OPEN 24 23 22 21 20 19 18 VEE C20 1000pF OUTPUT J9 L4 BLM11HA601SG R1 5k VEE TP11 TP12 R29 49.9 BIASMON BIASSET MODEN VTT DATA+ DATA- RTEN BIAS N.C. VEE GND MODN1 MOD MODN2 GND GND VEE DATAJ2 U1 MAX3935 CLK+ J3 CLK+ CLK- VEE CLKJ4 C17 0.01F C19 1000pF VEE VEE 10 11 12 13 14 15 C18 0.01F C2 1000pF C12 0.01F VEE CW R19 OPEN TP3 VREF CW R17 15k TP4 R15 5k 2 3 1 + 7 5 4 VEE 6 VEE VEE R20 100 C15 100pF R27 49.9 L1 220nH TP6 R13 2k CW TP2 TP10 VEE J5 -5.2V C8 0.01F J6 GND C9 10F U4 VEE 2 VREF MAX6190 IN OUT 6 16 VEE 9 R18 200k R16 5k U2 GND 4 VEE VEE MAX480 TP5 VEE Figure 1. MAX3935 EV Kit Schematic _______________________________________________________________________________________ 3 MAX3935 Evaluation Kit Evaluates: MAX3935 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 MAX3935 Evaluation Kit Evaluates: MAX3935 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 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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