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| 19-2059; Rev 1; 4/02 MAX3970 Evaluation Kit General Description The MAX3970 evaluation kit (EV kit) is a fully assembled chip-on-board electrical demonstration kit that provides easy evaluation of the MAX3970 10.3Gbps, +3.3V transimpedance amplifier. Note that the MAX3970 EV kit provides an electrical interface to the IC, which is similar to, but not exactly the same as, a photodiode. The circuit used tends to increase bandwidth and jitter beyond what is expected for typical photodiode inputs. o Fully Assembled and Tested o EV Kit Designed for 50 Interfaces Features o Easy +3.3V Electrical Evaluation of the MAX3970 Evaluates: MAX3970 Ordering Information PART MAX3970EVKIT TEMP RANGE 0C to +85C IC PACKAGE Dice Component Suppliers SUPPLIER AVX Murata PHONE 843-444-2863 814-237-1431 FAX 803-626-3123 814-238-0490 DESIGNATION C2, C4, C13 C11, C12, C15, C16 C14 J1-J5 JU1 L1 R1, R2, R4, R5 R3, R6 R7 TP1, TP2, VCC, GND U1 None QTY 3 4 1 5 1 1 4 2 1 4 1 1 Component List DESCRIPTION 1000pF 10% ceramic capacitors (0402) 0.01F 10% ceramic capacitors (0402) 33F 10% tantalum capacitor SMA connectors edge mount 2-pin header, 0.1in centers Ferrite bead (0603) Murata BLM11HA601SG (0603) 243 1% resistors (0402) 49.9 1% resistors (0402) 10k 1% resistor (0402) Test points MAX3970U/D Shunt Note: Please indicate that you are using the MAX3970 when ordering from these suppliers. ________________________________________________________________ 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. MAX3970 Evaluation Kit Evaluates: MAX3970 Quick Start 1) Connect a signal source with 500mVP-P amplitude to the INPUT. Set the data rate for the signal source to 10.3Gbps. 2) Connect OUT+ (J2) and OUT- (J3) to the 50 inputs of a high-speed oscilloscope. 3) Remove the shunt from JU1. 4) Connect a +3.3V supply to the proper terminals and power up the EV kit. 5) The differential signal at the oscilloscope should be approximately 450mVP-P. 3) Calculate the AC signal current (IINPUT in amps) as follows, and adjust the signal generator to obtain it: (r - 1) I INPUT = 2IAVE e (re + 1) For example, to emulate a signal with an average power of -10dBm and an extinction ratio of 8: 1) -10dBm optical power will produce 85A of average input current (assume a photodiode responsivity of 0.85A/W). Install a current meter between the TEST pin and a DC source. Adjust the source to provide 85A. 2) The signal amplitude is 2IAVE(re -1)/(re +1) = 132A. To generate this current through the two 243 series input resistors, set the signal source to produce an output level of 64mVP-P. Detailed Description The MAX3970 accepts a DC-coupled input from a highspeed photodiode, at optical modulation amplitudes ranging from 40AP-P to 2.0mAP-P. To facilitate characterization without a photodiode, the MAX3970 EV kit provides a simple circuit that emulates the photodiode using the signal voltage from a 50 source. The connector at IN (J1) is terminated with 50 to ground. Signal voltage applied to the EV kit's input is AC-coupled to a resistance in series with the MAX3970's input, creating an input signal current. Photodiode DC current can be emulated by injecting DC current into the TEST pin (TP1). The TEST pin is connected to IN through an on-chip 1k resistor. Noise Measurements Remove R1 before attempting noise measurements. With R1 removed, the total capacitance at the IN pin is approximately 0.2pF. 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 (PAVE in dBm) and extinction ratio (re). 2) Calculate the average current (IAVE in amps) as follows: IAVG = 10(PAVE / 10) 1000 where is photodiode responsivity in A/W 2 _______________________________________________________________________________________ MAX3970 Evaluation Kit Evaluates: MAX3970 J8 GND 3.3V C15 0.01F C14 33F J7 L1 VCC BP17 3.3V 3.3V BP18 BP1 1 BP2 2 VCC1 BP3 JU1 C16 TP1 0.01F C2 1000pF J1 IN R2 243 R1 243 BP4 4 BP5 5 BP6 R3 49.9 6 GND GND 7 BP7 C4 1000pF J5 CALIN BP8 R5 243 GND 8 BP9 R4 243 J4 CALOUT IN OUT11 BP10 GND GND 9 10 TEST OUT+ 12 BP12 C12 0.01F 3 FILTER VCC1 U1 18 17 BP16 16 RSSI VCC2 VCC2 15 14 13 BP13 BP15 C13 1000pF VCC1 3.3V 3.3V R7 10k TP2 BP14 VCC2 MAX3970 GND C11 0.01F J2 OUT + J3 OUT - BP11 R6 49.9 Figure 1. MAX3970 EV Kit Schematic _______________________________________________________________________________________ 3 MAX3970 Evaluation Kit Evaluates: MAX3970 1.0" Figure 2. MAX3970 EV Kit Component Placement Guide-- Component Side 1.0" Figure 3. MAX3970 EV Kit PC Board Layout--Component Side 1.0" Figure 4. MAX3970 EV Kit PC Board Layout--Solder Side 1.0" Figure 5. MAX3970 EV Kit PC Board Layout--Ground Plane 4 _______________________________________________________________________________________ MAX3970 Evaluation Kit Evaluates: MAX3970 1.0" Figure 6. MAX3970 EV Kit PC Board Layout--Power Plane 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) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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