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| 19-0409; Rev 1; 3/07 MAX3654 Evaluation Kit ________________General Description The MAX3654 evaluation kit (EV kit) is a factoryassembled printed circuit board (PCB) that provides two circuit versions--optical input and electrical input. The optical circuit includes the photodiode bias circuitry, an op amp for feed-forward AGC operation, and a balun for single-ended 75 output. Through-hole pads are provided to attach a triplexer analog photodiode. It is important to select a photodiode with capacitance and inductance in the anode and cathode connections as symmetric as possible for optimum linearity. The electrical circuit is normally configured with a 50 input for use with conventional test and measurement equipment and a 75 output. The 75 output can be connected to 50 test and measurement equipment using a minimum loss pad. If desired, the MAX3654 input can also provide a 75 input by replacing R12 and R13 with 25 resistors. _________________________ Features Fully Assembled and Tested Optical and Electrical Inputs Automatic Gain Control Evaluates: MAX3654 _______________Ordering Information PART MAX3654EVKIT TEMP RANGE -40C to +85C IC-PACKAGE 16 QFN __________________________________________________ Evaluation Component List DESIGNATION C1, C2, C4, C5, C19-C22 C3, C7, C8, C9, C12, C16, C17, C23, C24, C27, C29 C6, C10, C11, C25, C26 C13, C14, C28 R6, R18 R2 R3, R4, R5, R16, R17 R1, R21 R7, R19 R9, R15 R12, R13 R8, R20 R22 QTY 8 11 5 3 2 1 6 2 2 2 2 2 1 DESCRIPTION 0.001F 10% ceramic capacitors (0402) 0.1F 5% ceramic capacitors (0603) 1F 10V, 10% min ceramic capacitors 33F 10V, 20% min tantalum capacitors 1.62k 1% resistors (0402) 10 1% resistor (0402) 100k 1% resistors (0402) 1k 1% resistors (0402) 2.43k 1% resistors (0402) 20k 1% resistors (0402) 12.1 1% resistors (0402) 6.04k 1% resistors (0402) open (0402) DESIGNATION J2, J4 J3 TP1-TP13 JU1-JU3, JU5, JU6 L1, L5 L2, L6 U1, U3 U2, U4 U5 U6 U7, U8 QTY 2 1 13 5 2 2 2 2 0 1 2 DESCRIPTION BNC 75, Edge Mount Trompeter UCBJE20-1 SMA connector, tab contact, Johnson, 142-0701-851 Test Points 2-pin headers, 0.1in centers Bead, Murata BLM15HD182SN1 (0402) 10H inductor, TDK MLF1608E100K (0603) MAX3654ETE+ MAX4240EUK Photodiode not supplied Balun Pulse Engineering CX2039 Balun Pulse Engineering CX2038 __________________________________________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. MAX3654 Evaluation Kit Evaluates: MAX3654 _____________Component Suppliers SUPPLIER AVX Pulse Engineering Murata PHONE 803-448-9411 858-674-8100 770-436-1300 WEBSITE www.avxcorp.com www.pulseeng.com www.murata.com 5) 6) Connect a +5V supply to the VCC terminal, TP7 and ground to the GND terminal, TP8. Apply 1.4V to TP12 to set the MAX3654 gain to minimum, 43.5dB. A voltage from 0.175V to 1.4V at TP12 adjusts the gain from 62dB to 43.5dB Input and Output Signal Levels When used in the electrical input configuration shown in Figure 2, the MAX3654 is intended to operate with AC input signal current from 175AP-P to 1.6mAP-P. The corresponding electrical input is -37dBm (0 < VAGC < 0.175V) to -18dBm (VAGC = 1.4V), on 50. The MAX3654 EV Kit can also be configured to provide 75 input impedance by replacing R12 and R13 with 25 resistors. When used in the optical input configuration shown in Figure 2, JU2 may be connected to R3 to configure the MAX3654 for AGC operation based on the average optical power level. In this case, the MAX3654 transimpedance is controlled by the average optical power level, as measured by the voltage across R21. The values of R1, R21 and R22 shown in Figure 1 will provide an output level of 15dBmV/ch (+1dB) for optical input signals ranging from -6dBm to +2dBm, (OMI = 3.5%, N = 129) using a typical triplexer photodiode. The total output signal level in this case is 15dBmV/ch + 10 log(129 channels) = 36dBmV, which is the maximum operating level at which the specified linearity will be achieved. Operating at higher outputs may reduce MAX3654 performance. Operating conditions (OMI, number of channels, responsivity, etc) change the VAGC setting required for a given output voltage. EV Kit AGC circuit gain can be increased by adding a voltage-divider, R22, to the op amp. To reduce gain the values of R1 and R21 should both be increased. Remember to keep the total output at 36dBmV or less to maintain the desired MAX3654 performance. Note: Please indicate that you are using the MAX3654 when contacting these component suppliers. ________________________Quick Start Optical Evaluation 1) Attach triplexer photodiode to IN+ and IN- of the MAX3654. The cathode normally connects to IN+. The photodiode case should be grounded to the most convenient ground via. Make certain that the anode and cathode leads are symmetric in length and orientation, lead lengths should normally be about 5mm. Set JU2 to R4 to manually adjust the gain with an input from 0 to 1.4V on TP3. Leave JU3 open for minimum hysteresis. Set JU1 to R8 to enable the output signal. Connect the signal output at J2 to a 75 spectrum-analyser input. A minimum loss pad may also be used to connect J2 to 50 test equipment. Connect a +5V supply to the VCC terminal, TP1 and ground to the GND terminal, TP2. Connect the photodiode bias supply to TP13. Typically use +12V bias supply, or as required by the photodiode. 2) 3) 4) 5) 6) 7) Electrical Evaluation 1) Connect a 50 signal source to IN at J3. Set the input signal level to PIN = -18dBm, so that the voltage on 50 produces the maximum input level of 1.6mAP-P. Connect the RF output at J4 to a 75 spectrum analyser input. A minimum loss pad may also be used to connect J4 to 50 test equipment. Leave JU6 open for minimum hysteresis. Set JU5 to R20 to enable output. Photodiode Lead Configuration Photodiode lead parasitic impedances can significantly effect performance of the MAX3654. It is especially important that the anode and cathode connections are electrically symmetric. Refer to Figure 1 in the MAX3654 data sheet. Note that the EV Kit layout is designed to minimize capacitance to ground in the input signal path. 2) 3) 4) 2 _________________________________________________________________________________________ MAX3654 Evaluation Kit _____________________________________Adjustments and Control Descriptions COMPONENT ELECTRICAL JU5 NA OPTICAL JU1 JU2 NAME MUTE VAGC FUNCTION MUTE. TTL high enables output. Low mutes output. Gain Control. Set JU2 to R4 for manual gain control. Set JU2 to R3 to allow feedforward AGC operation. The electrical circuit board is always set for manual gain control. Hysteresis. Leave open for (minimum) 0.13dB hysteresis between gain switch points. Connect 20k to ground for 0.3dB and short to GND for (maximum) 0.65dB hysteresis. Evaluates: MAX3654 JU6 JU3 Hysteresis VPD R2 10 L2 10H C3 0.1F L1 BEAD BLM15HD182SN1 R1 1k C1 0.001F U5 R21 1k C2 0.001F R3 100k C6 R22 VCC + MAX4240 - U2 TP3 R5 100k C11 C14 33F C13 33F 1F R6 1.62k TP4 JU1 VCC R8 6.04k 1F Open C12 0.1F VCC 4 C29 0.1F VCC TEST2 GND TEST1 1 2 3 GND C7 0.1F 16 15 14 13 C8 0.1F VCC OUT+ 12 11 10 VCC 9 VCC 0.001F C4 VCC IN+ INVCC VAGC MUTE HYST J2 U8 CX2038 MAX3654 U1 EP* GND OUTVCC C5 0.001F C9 0.1F L6 10H L5 BEAD BLM15HD182SN1 R4 100k C10 1F VCC JU2 VAGC 5 6 7 8 R9 JU3 HYST EP TP6 GAIN TP13 VPD TP1 VCC TP5 TP2 GND 20k VPD MUTE R7 2.43k *EP - Exposed Pad, Solder to GND Figure 1. MAX3654 Optical EV Kit Schematic _______________________________________________________ 3 MAX3654 Evaluation Kit Evaluates: MAX3654 TEST2 GND TEST1 VCC R12 J3 U6 CX2039 12 C20 0.001F C19 0.001F 1 2 3 VCC 4 C17 C27 VCC 0.1F 0.1F GND C16 0.1F 16 15 14 13 C23 0.1F VCC OUT+ 12 11 10 VCC 9 VCC 0.001F C21 VCC IN+ INVCC VAGC MUTE HYST J4 U7 CX2038 MAX3654 U3 EP* GND R13 12 OUTVCC C22 0.001F C24 0.1F 5 6 7 8 R15 EP TP12 GAIN R16 100k + C25 1F VCC MAX4240 - U4 R17 100k C28 33F R18 C26 1F 1.62k JU6 HYST TP9 TP10 JU5 20k TP7 VCC TP8 TP11 GND MUTE R19 2.43k VCC R20 6.04k *EP - Exposed Pad, Solder to GND Figure 2. MAX3654 Electrical EV Kit Schematic 4 ________________________________________________________________________________________ MAX3654 Evaluation Kit Evaluates: MAX3654 Figure 3. MAX3654 EV Kit PC Component Placement Guide-- Component Side Figure 4. MAX3654 EV Kit PC Board Layout--Component Side Figure 5. MAX3654 EV Kit PC Board Layout--Ground Plane Figure 6. MAX3654 EV Kit PC Board Layout--Power Plane Figure 7. MAX3654 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___________________5 (c) 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products |
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