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| 19-1622; Rev 0; 1/00 MAX3665 Evaluation Kit General Description The MAX3665 evaluation kit (EV kit) simplifies evaluation of the MAX3665 transimpedance preamplifier. The EV kit includes a circuit that emulates the zero-to-peak current input signal that would be produced by a photodiode. It also includes a calibration circuit that allows accurate bandwidth measurements. The MAX3665 EV kit is fully assembled and tested. PART MAX3665EVKIT Features o Fully Assembled and Tested o Includes Photodiode Emulation Circuit o Calibration Circuit for Accurate Bandwidth Measurements Evaluates: MAX3665 Ordering Information TEMP. RANGE -40C to +85C IC PACKAGE 8 MAX Component List DESIGNATION QTY C1, C2, C4, C7, C10, C11 C3, C5, C6, C12-C16 C8, C9 C17, C20, C23 C18, C19, C21 J1-J5 J11-J14 JU1, JU2 L1, L2 L3-L8 R1, R9 R2, R4, R10, R12 R3, R11 R5 R6, R8 R7 U1 U2 U3 U4, U5 VCC, +15V, GND None None None 6 8 2 3 3 5 4 2 2 6 2 4 2 1 2 1 1 1 1 0 3 2 1 1 DESCRIPTION 1000pF 10%, 25V min ceramic capacitors 0.1F 10%, 10V min ceramic caps 33F 10%, 16V min tantalum caps AVX TAJC336K016 5pF 0.1pF, 50V capacitors 4pF 0.1pF, 50V capacitors SMA connectors (edge mount) Open 2-pin headers (0.1in centers) Ferrite beads Murata BLM11HA601S 22nH 5% inductors 2k 1% resistors 1k 1% resistors 49.9 5% resistors 1k potentiometer 10k 5% resistors 10k potentiometer MAX3665EUA (8-pin MAX) CMPT3906 PNP transistor MAX400CSA (8-pin SO) User-supplied optical modules Test points Shunts for JU1, JU2 MAX3665 evaluation kit (rev B) circuit board MAX3665 data sheet SUPPLIER AVX Central Semiconductor Murata Zetex Component Suppliers PHONE 843-444-2863 516-435-1110 770-684-7821 516-543-7100 FAX 843-626-3123 516-435-1824 - 516-864-7630 Note: Please indicate that you are using the MAX3665 when contacting these component suppliers. Quick Start 1) Connect a signal source to INPUT. Set the signal amplitude to 50mVp-p (this may require some attenuation between the source and the MAX3665 EV kit). The signal should have a data rate up to 622Mbps. 2) Connect OUT+ and OUT- to the 50 inputs of a high-speed oscilloscope. 3) Remove shunts from jumpers JU1 and JU2. 4) Connect a +3.3V or +5.0V supply to the VCC terminal and ground to the GND terminal. 5) The differential signal at the oscilloscope should be between 100mVp-p and 150mVp-p. Detailed Description The MAX3665 is designed to accept a DC-coupled input from a photodiode with an amplitude up to 450A peak-to-peak. Because the MAX3665 provides a DC bias for the photodiode, it cannot be DC-coupled to signal sources. To allow characterization without a photodiode, the MAX3665 EV kit provides a simple circuit that emulates a photodiode using common voltage output signal sources. ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. MAX3665 Evaluation Kit Evaluates: MAX3665 The connector at INPUT is terminated with 50 to ground. This voltage is then AC-coupled to a resistance in series with the MAX3665's input, creating an input current. U2 and U3 form a simple DC current source that is used to apply a DC offset to the input signal. The values of the series resistive elements, R1 and R2, have been carefully selected so as not to change the bandwidth of the transimpedance amplifier. Surfacemount resistors have parasitic capacitance that reduces their impedance at frequencies above 1GHz. The user should carefully evaluate any changes to R1 and R2 using the calibration network provided on the EV kit. 3) Calculate the AC signal current (IINPUT in Amps) as follows, and adjust the signal generator to obtain it: IINPUT = 2 * IAVG(re - 1) / (re + 1) For example: 1) Emulate a signal with an average power of -20dBm and an extinction ratio of 10. 2) -20dBm optical power will produce 10A of average input current (assume photodiode responsivity of 1A/W). Install a current meter at JU1. Adjust R7 and R5 until the current is 10A. 3) The signal amplitude is IAVG(re - 1) / (re + 1) = 16A. To generate this current through the 3000 input resistors, set the signal source to produce an output level of 16A * 3000 = 48mVp-p. Photodiode Emulation The following procedure can be used to emulate the high-speed current signal generated by a photodiode: 1) Select the desired optical power (PAVG in dBm) and extinction ratio (re). 2) Calculate the average current (IAVE in Amps) as follows, and adjust R7 and R5 to obtain it: IAVG = 10 Noise Measurement Remove R2 before attempting noise measurements to minimize input capacitance. With R2 removed, the total capacitance at the IN pin is approximately 0.5pF. Refer to the MAX3665 data sheet for more information. (PAVG/10) 1000 where = photodiode responsivity in A/W. Table 1. Connections, Adjustments, and Control CONTROL VCC +15V GND JU1 JU2 R5 R7 OUT+, OUTINPUT DESCRIPTION Supply Voltage Connection (+3.3V or +5V, 100mA current limit) Supply Voltage Connection for Photodiode Emulator Circuit (+15V, 25mA) Connection for Ground When shunted, the photodiode emulation circuit is active. This is a convenient location to measure the emulated photodiode current. Test Pin. Shunting JU2 disables the MAX3665 DC cancellation amplifier. Potentiometer. Fine adjustment of the DC current input. Potentiometer. Coarse adjustment of the DC current input. Connections for the MAX3665 Output Signal Input Connection for a Signal Generator 2 _______________________________________________________________________________________ C7 1000F R12 1k C16 0.1F J5 NOTE: VCC1 AND VCC2 ARE INTERNAL POWER CONNECTIONS. NO GND PLANE R10 R9 1k 2k +15V J4 INPUT R11 49.9 2 2 U3 61 U2 +15V 3 7 +15V C4 1000pF JU1 J7 VCC FERRITE L2 C9 33F 25V J8 GND C8 33F 25V 2 3 MAX400 R6 10k 2 4 J6 +15V FERRITE L1 Figure 1. MAX3665 EV Kit Schematic J9 VCC1 J10 NO GND PLANE J1 INPUT 3 R3 49.9 4 JU2 FILT 2 IN U1 C3 0.1F VCC1 VCC R1 2k R2 1k 1 C2 1000pF GND OUT8 7 6 GND 5 C18 4pF L4 22nH L3 22nH VCC2 C5 0.1F C17 5pF C6 0.1F J3 OUT+ C1 1000pF R4 1k J2 OUTN.C. MAX3665 OUT+ 1 VCC GND 3 L8 22nH C15 0.1F U5 OUT+ C23 5pF J11 OUT2 4 C21 4pF L7 22nH J12 VCC2 C11 1000pF C14 0.1F 1 2 VCC GND OUTU4 OUT+ 4 3 C19 4pF L5 22nH C20 5pF L6 22nH C13 0.1F C12 0.1F J14 J13 1 R5 1k 3 1 R7 10k 3 R8 10k Evaluates: MAX3665 _______________________________________________________________________________________ VCC2 C10 1000pF MAX3665 Evaluation Kit 3 MAX3665 Evaluation Kit Evaluates: MAX3665 1.0" Figure 2. MAX3665 EV Kit Component Placement Guide 1.0" 1.0" Figure 3. MAX3665 EV Kit PC Board Layout--Component Side Figure 4. MAX3665 EV Kit PC Board Layout--Ground Plane 4 _______________________________________________________________________________________ MAX3665 Evaluation Kit Evaluates: MAX3665 1.0" 1.0" Figure 5. MAX3665 EV Kit PC Board Layout--Power Plane Figure 6. MAX3665 EV Kit PC Board Layout--Solder Side _______________________________________________________________________________________ 5 MAX3665 Evaluation Kit Evaluates: MAX3665 NOTES 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) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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