MAX3760 Evaluation MAX3760 evaluation kit) simplifies evaluation

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MAX3760 Evaluation MAX3760 evaluation kit) simplifies evaluation

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MAX3760 Evaluation
MAX3760 evaluation kit) simplifies evaluation MAX3760 transimpedance preamplifier. MAX3760 optimized hybrid applications that place preamplifier same package with photodetector. uses packaged version MAX3760 simplify product evaluation. allows both optical electrical testing. MAX3760's input voltage determined internal circuitry. When input connected photodiode, MAX3760's input voltage determines reverse diode voltage. Electrical signal sources connected input must coupled. coupling input removes signal's component. Many MAX3760's specifications affected average input current, which normally present when input signal derived from photodiode. current mirror simple bias-tee used create signal similar that photodiode. MAX3760 several mounting holes inserting common photodiodes, allowing optical testing. Single Supply Differential Output Drives Load 560MHz Bandwidth Electrical Optical Input Provision User-Supplied Photodiode Fully Assembled Tested
Features
Evaluates: MAX3760
Ordering Information
PART MAX3760EVKIT-SO TEMP. RANGE -40°C +85°C BOARD TYPE Surface Mount
Component Suppliers
SUPPLIER Central Semiconductor Zetex PHONE 803-946-0690 516-435-1110 516-543-7100 803-626-3123 516-435-1824 516-864-7630
Component List
DESIGNATION DESCRIPTION 33µF, tantalum capacitors TAJE336K025R 0.01µF, ceramic capacitors 0.1µF, ceramic capacitors 49.9, resistor 200, resistors resistor resistor resistors potentiometer 47µH inductor Panasonic ELJ-FA470KF2 JU1, None None DESIGNATION DESCRIPTION 4.7µH inductors Panasonic ELJ-FA4R7KF2 small-signal transistors Zetex BCX71KCT High-speed switching diode Central Semiconductor CMPD4448 MAX3760ESA connectors edge mount) E.F. Johnson 142-0701-801 2-pin headers Shunts MAX3760 data sheet
Maxim Integrated Products
free samples latest literature: http://www.maxim-ic.com, phone 1-800-998-8800 small orders, phone 408-737-7600 ext. 3468.
MAX3760 Evaluation Evaluates: MAX3760
_Quick Start
Test Equipment Required
Signal-source sine-wave generator network analyzer with range 650MHz Signal-source function generator with range 1MHz Signal-source pattern generator Power supply capable 5.5V, 35mA output with current limit Oscilloscope with least 1GHz bandwidth Wideband noise meter power meter 470MHz filter with Bessel response (example: Mini Circuits SBLP-467 filter)
Jumper This jumper grounds MAX3760's COMP pin. cancellation circuit disabled when COMP grounded. Potentiometer This potentiometer controls amount current added input signal.
Measurement Information
Measurement When making measurements, place shunt after setting signal current. Wires attached this jumper noise signal. Measurement most measurements, place shunt disable cancellation circuit. Measure output offset with open. Noise Measurement Remove before attempting noise measurements minimize input capacitance. With removed total capacitance 0.75pF. Photodiode Emulation following relations emulate photodiode input with signal generator current mirror (Figure PAVE average power (assuming average duty cycle)
extinction ratio high signal level 2PAVE (re) signal level 2PAVE P1-P0 signal amplitude 2PAVE(re Input current related optical power photodiode responsivity shown following equations: IAVE (PAVE) example, follow these steps emulate signal with average power -20dBm extinction ratio -20dBm optical power will produce 10µA average input current (assume photodiode responsivity 1A/W). Install current meter JU1. Adjust until current 10µA. signal amplitude 2PAVE(re 16.3µA. generate this current through 3000 input resistors, signal source produce output level 16.3µA 3000 49mVp-p.
Setup
Connect power supply VCC1 GND. Remove shunts from JU2. Connect VOUT+ VOUT- dual-channel oscilloscope through terminated cables. Apply 150mVp-p, 311MHz square wave VIN. Observe each output approximately 150mVp-p oscilloscope.
_Detailed Description
Connections, Adjustments, Controls
VCC1 Connection This connection provides supply current MAX3760. Connect VCC2 Connection This connection provides supply current current mirror that adds component input signal. Connect used. J1-VIN Connection signal generator connected here. This input terminated with ground coupled (MAX3760) through series resistors (3000). signal input current MAX3760 VIN/3000. J3-VOUT+, J4-VOUT- Connection These MAX3760 outputs. These connectors coupled MAX3760 connect directly test equipment with input impedance. Jumper This jumper series with current mirror that adds component input signal. This convenient place measure input current.
MAX3760 Evaluation
Using Photodiode Remove resistor before installing your photodiode holes provided location Connect photodiode anode (pin MAX3760. Connect photodiode cathode junction Connect photodiode case ground INREF.
Evaluates: MAX3760
Supply Current Supply current, specified MAX3760 data sheet, current flowing into VCC1 pad. Current flowing into VCC2 powers current mirror only.
POWER
PAVE
TIME
Layout Considerations
layout been developed packaged MAX3760s. controlled impedance traces used VOUT+ VOUT- signal paths. Power ground planes relieved beneath MAX3760 reduce input capacitance.
Figure Optical Power Definitions
MAX3760 Evaluation Evaluates: MAX3760
4.7µH VCC1 33µF 4.7µH VCC2 0.01µF 33µF 0.01µF CMPD4448 BCX71KCT BCX71KCT 47µH 0.1µF NOTE: MUST INSTALLED SHOWN. 0.01µF PHOTODIODE COMP 0.1µF 0.1µF VOUT+ VOUTSMA
MAX3760 OUT+ OUT-
INREF
49.9
Figure MAX3760 Schematic
MAX3760 Evaluation Evaluates: MAX3760
Figure MAX3760 Component Placement Guide- Component Side
Figure MAX3760 Board Layout-Component Side
Figure MAX3760 Board Layout-Ground Plane
MAX3760 Evaluation Evaluates: MAX3760
Figure MAX3760 Board Layout-Power Plane
Figure MAX3760 Board Layout-Solder Side
MAX3760 Evaluation
NOTES
Evaluates: MAX3760
MAX3760 Evaluation Evaluates: MAX3760
NOTES
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 1998 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

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