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| 19-2969; Rev 0, 8/03 MAX3744/MAX3745 Evaluation Kit ______________ General Description The MAX3744/MAX3745 evaluation kit (EV kit) allows complete evaluation of both versions of 2.7Gbps transimpedance amplifiers. The EV kit includes a circuit that emulates the high speed, zero-to-peak current input signal that would be produced by a photodiode. The kit also includes a calibration circuit that allows accurate bandwidth measurement. The MAX3744/MAX3745 EV kit is fully assembled and tested. ________________________ Features Fully Assembled and Tested Includes Photodiode Emulation Circuit Calibration Circuit for Accurate Bandwidth Measurement Evaluates: MAX3744/MAX3745 _______________Ordering Information PART MAX3744EVKIT MAX3745EVKIT TEMP RANGE -40C to +85C -40C to +85C IC-PACKAGE Die Die ________________________________________Electrical Evaluation Component List DESIGNATION C3, C5, C6 C4, C7, C8, C10, C11 C2 C1 R3, R4, R11, R12 R5, R8 R6, R7 R9, R10 QTY 3 5 1 1 4 2 2 2 DESCRIPTION 0.01F 10% ceramic capacitors (0201) 0.1F 10% ceramic capacitors (0402) 10F 10% 10V min ceramic capacitor 33F 5% 10V min tantalum capacitor 499 1% resistor (0402) 4.99k 1% resistor (0402) 53.6 1% resistor (0402) 49.9 1% resistor (0402) MAX3744 EV board Not installed MAX3745 EV board 24.9 1% resistor (0402) MAX3744 EV board 0 shunt resistor (0402) MAX3745 EV board 10k 1% resis tor (0402) Outside Vendor Supply Outside Vendor Supply None None 0 0 1 1 DESIGNATION L1 JU1 J3-J7 TP1-TP4 U1 QTY 1 1 5 4 1 DESCRIPTION 56nH inductor Coilcraft 1008CS-560XKBC 2-pin header, 0.1in centers SMA connectors, round, Johnson 142-0701-801 Test Points MAX3744E/D MAX3744 EV board MAX3745E/D MAX3745 EV board 1mil Au wire (8 bonds) Epoxy, Ablefilm 84-1 LMI Shunt MAX3744 EV board MAX3745 EV board None 1 MAX3744/MAX3745 Data Sheet R13, R14 R15, R16 2 2 __________________________________________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. MAX3744/MAX3745 Evaluation Kit _____________Component Suppliers SUPPLIER AVX PHONE 803-946-0690 847-639-6400 814-237-1431 FAX 803-626-3123 847-639-1469 814-238-0490 the transimpedance amplifier is not altered. Surfacemount resistors have parasitic capacitance that may reduce their impedance at frequencies above 1GHz. ____________Photodiode Emulation The following procedure can be used to emulate the high-speed current signal generated by a photodiode: 1) 2) Select the desired optical power (PAVE, dBm) and extinction ratio (re). Calculate the average current (IAVE, A). Set the DC current at TP1 to IAVE. Evaluates: MAX3744/MAX3745 Coilcraft Murata Note: Please indicate that you are using the MAX3744/MAX3745 when contacting thes e component suppliers. ________________________Quick Start 1) Connect a signal source to IN at J3. Set the signal amplitude to 100mVp-p (this may require some attenuation between the source and the MAX3744/MAX3745 EV kit.) The signal should have a data rate of 2.5Gbps. Connect OUT+ and OUT- to the 50O inputs of a high-speed oscilloscope at J6 and J7. Remove the shunt from jumper JU1. Connect a +3.3V supply to the VCC terminal and ground to the GND terminal. The differential signal at the oscilloscope should be greater than 280mVp-p (140mVp-p on MAX3744 EV Kit). I AVE = 10 ( PAVE /10) 1000 (?= photodiode responsivity in A/W) 3) Calculate the AC signal current and adjust the signal generator to obtain it. 2) 3) 4) 5) I AC = 2 I AVE re - 1 re + 1 For example: To emulate a photodiode with an average power of -16dBm and an extinction ratio of 10; 1) -16dBm optical power will produce 25A of average input current (assume photodiode responsivity of 1A/W). Set the DC current input to 25A at TP1. The signal amplitude is 2 IAVE (r e-1)/(re+1)=41A. To generate this current through the 1000O input resistors, set the signal source to produce an output level of 41A*1000 O = 41mVp-p. ______________Detailed Description The MAX3744/MAX3745 EV kit allows characterisation without a photodiode. The kit is designed to emulate a DC-coupled photodiode input. Diode currents may have 6uApp to 2mApp AC-current with a DC component from 10uA to 1mA. The high-speed current source of the photodiode is emulated on the EV kit using separate AC and DC paths. The AC signal is supplied from a standard 50O lab source that delivers power to an on board termination resistor. A current is then generated from the voltage signal by a resistor with low stray capacitance. The effect of the DC photodiode current may be emulated by a current source at TP1. An isolation resistor prevents the DC source from loading the AC path. The values of the series resistive element, R3 and R4, have been carefully selected so that the bandwidth of 2) ______________Noise Measurement Remove R3 and R4 before attempting noise measurements to minimize input capacitance. With R3 and R4 removed the total capacitance at the IN pin is approximately 0.85pF. __________________RSSI (MAX3744) The Average Power at the MAX3744 input is indicated by the common mode output measured at TP2 and TP3. Refer to the MAX3744 data sheet for details. _____________________________________Adjustments and Control Descriptions COMPONENT JU1 TP1 TP2, TP3 NAME OFFSET CORRECTION DC CURRENT INPUT OUTPUT COMMON MODE FUNCTION Instal JU1 to disable offset correction. Apply DC current for photodiode simulation. MAX3744 RSSI Signal 2 _________________________________________________________________________________________ MAX3744/MAX3745 Evaluation Kit VCC VCC TP2 49 R16 R10 49 R15 10k R9 For MAX3745 Leave R9 and R10 Open Evaluates: MAX3744/MAX3745 TP3 L1 56nH J1 J2 TP4 C1 C2 10F VCC 1 C3 V CC 10k 10 GND OUT+ 9 33F 0. 1F C4 0.01F 2 NC 3 V CCZ IN MAX3744/ MAX3745 R14 C10 J6 24. 9 For MAX3745 Short R13, R14 0.1 F J3 R6 53. 6 R4 R3 4 499 499 JU1 5 4. 99k R5 TP1 FILTER GND 6 OUTNC 7 8 R13 C11 J7 24. 9 0.1F 0. 01F 0. 1F C7 C5 J4 R7 53. 6 R11 R12 C8 J5 0 .1F 499 499 4. 99k R8 0 .01F C6 Figure 1. MAX3744/MAX3745 EV Kit Schematic Figure 2. MAX3744/MAX3745 EV Kit PC Component Placement Guide--Component Side _______________________________________________________ 3 MAX3744/MAX3745 Evaluation Kit Evaluates: MAX3744/MAX3745 Figure 3. MAX3744/MAX3745 EV Kit PC Board Layout--Component Side Figure 5. MAX3744/MAX3745 EV Kit PC Board Layout--Power Plane Figure 4. MAX3744/MAX3745 EV Kit PC Board Layout--Ground Plane Figure 6. MAX3744/MAX3745 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600___________________4 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products |
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