MAX3740 Evaluation MAX3740 evaluation kit) assembled demonstratio

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MAX3740 Evaluation MAX3740 evaluation kit) assembled demonstratio

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19-2694; 12/02
MAX3740 Evaluation
MAX3740 evaluation kit) assembled demonstration board that provides complete optical electrical evaluation MAX3740 VCSEL driver. electrical section optical section. output electrical evaluation section interfaced connector, which connected terminated oscilloscope. optical section evaluation board populated with DS1858 digital potentiometer allows evaluation MAX3740 layout. With slight modifications, common-cathode VCSEL also evaluated using electrical side kit. Fully Assembled Tested Single +3.3V Power-Supply Operation Allows Optical Electrical Evaluation Allows Evaluation with DS1858 Layout
Features
Evaluates: MAX3740
Ordering Information
PART MAX3740EVKIT TEMP RANGE -40°C +85°C PACKAGE
Electrical Evaluation Component List
DESIGNATION C13, C15, C16, C11, DESCRIPTION 0.1µF ±10% ceramic capacitors (0402) 0.047µF ±10% ceramic capacitor (0402) 0.01µF ±10% ceramic capacitors (0402) Open 10µF ±10% ceramic capacitor (0805) 10µF ±10% tantalum capacitor, case VCSEL laser photodiode* LED, package ferrite beads (0603) Murata BLM18HD102SN1 inductor (1008CS) Coilcraft 1008CS-102XKBC potentiometers resistor (0402) 2.49k resistor (0402) resistors (0402) resistors (0402) resistor (0402)* 4.7k resistor (0402) 49.9 resistors (0402) JU1-JU8, JU10 J1-J7 TP1-TP11, TP20, TP21 None None None DESIGNATION R10, R26, R27, R34, R35, Open potentiometer potentiometer 500k potentiometer transistors (SOT23) Zetex FMMT491A MOSFET (SOT23) Zetex BS170F 2-pin headers, 0.1in centers connectors, round contacts Test points MAX3740ETG QFN) MAX495ESA Shunts MAX3740 board MAX3740 data sheet DESCRIPTION
*These components supplied populated user wants test VCSEL with electrical side kit.
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
MAX3740 Evaluation Evaluates: MAX3740
Optical Evaluation Component List
DESIGNATION C20, C25, C23, C26, C28, R17, R18, R21, R22, R23, R29, TP13-TP19, TP22, TP23 DESCRIPTION 0.01µF ±10% ceramic capacitor (0402) 0.1µF ±10% ceramic capacitors (0402) 10µF ±10% tantalum capacitor, case 0.047µF ±10% ceramic capacitor (0402) 0.01µF ±10% ceramic capacitors (0201) Open connectors, round contacts 2-pin header, 0.1in center inductor (1008CS) Coilcraft 1008CS-102XKBC ferrite bead (0603) Murata BLM18HD102SN1 4.7k resistors (0603) Open resistor (0201) 1.7k resistor (0201) resistors (0201) 49.9 resistor (0402) resistor (0402) Test points MAX3740ETG (24-pin QFN) DS1858 (16-pin BGA, 1.5mm pitch)
Quick Start
Electrical Evaluation
electrical configuration, automatic power-control (APC) test circuit included emulate semiconductor laser with monitor photodiode. Monitor diode current provided transistor which controlled operational amplifier (U2). test circuit, consisting applies simulated monitor diode current MAX3740. ensure proper operation electrical configuration, evaluation board follows: Place shunts JU4-JU8 JU10 (see Adjustment Control Descriptions section details). Remove shunts JU2. enable outputs, connect TX_DISABLE placing shunt JU3. Note: When performing following resistance checks, autoranging DMMs forward bias on-chip protection cause inaccurate measurements. avoid this problem, manually high range. Adjust R15, RBIASSET potentiometer, 1.7k resistance between (BIASSET) ground. Adjust RPWRSET potentiometer, resistance between (REF) (MD) JU2. Adjust R14, RPEAKSET potentiometer, resistance between TP10 (PEAKSET) ground disable peaking. Adjust R16, potentiometer, resistance between (TC1) (TC2) disable temperature compensation. Adjust RMODSET potentiometer, resistance between (MODSET) ground. Apply differential input signal (250mV 2200mVP-P) between connectors (IN+ IN-). Attach high-speed oscilloscope with input connector (OUT). Connect +3.3V supply between TP20 (VCC) TP21 (GND). Adjust power supply until voltage between TP11 ground +3.3V. Adjust (RPWRSET) until desired laser bias current achieved. IBIAS VPIN1_ 49.9
Component Suppliers
SUPPLIER Coilcraft Murata Zetex PHONE 803-946-0690 847-639-6400 814-237-1431 516-543-7100 803-626-3123 847-639-1469 814-238-0490 516-864-7630
MAX3740 Evaluation
BIAS currents monitored (VPWRMON) (VBIASMON) using equations below: VPWRMON RPWRSET VBIASMON Adjust R16, potentiometer, resistance between (TC1) (TC2), disable temperature compensation. Adjust RMODSET potentiometer, resistance between (MODSET) ground. Apply differential input signal (250mV 2200mVP-P) between connectors (IN+ IN-). Attach VCSEL fiber connector optical/electrical converter. Connect +3.3V supply between TP20 (VCC) TP21 (GND). Adjust power supply until voltage between TP11 ground +3.3V. Adjust (RPWRSET) until desired average optical power achieved. BIAS currents monitored (VPWRMON) (VBIASMON) using following equations: VPWRMON RPWRSET VBIASMON
Evaluates: MAX3740
IBIAS
Note: voltage exceeds VPMTH (0.8V typ) exceeds VBMTH (0.8V typ), FAULT signal asserted latched. Adjust until desired laser modulation current achieved. IMOD Signal Amplitude
Adjust (RPEAKSET) until desired amount peaking achieved.
Optical Evaluation with Mechanical Potentiometers
optical evaluation MAX3740, configure evaluation follows: Place shunts JU2, JU6, JU7, JU8, JU10 (see Adjustment Control Descriptions section). Remove components Remove shunts from JU1, JU4, JU5. Install resistor connect anode VCSEL output. enable outputs, connect TX_DISABLE placing shunt JU3. Connect common-cathode VCSEL shown Figure Keep leads short reduce reflection. Note: When performing following resistance checks, autoranging DMMs forward bias on-chip protection cause inaccurate measurements. avoid this problem, manually high range. Adjust R15, RBIASSET potentiometer, 1.7k resistance between (BIASSET) ground. Adjust RPWRSET potentiometer, resistance between (REF) (MD) JU2. Adjust R14, RPEAKSET potentiometer, resistance between TP10 (PEAKSET) ground disable peaking. IBIAS
Note: voltage exceeds VPMTH (0.8V typ) exceeds VBMTH (0.8V typ), FAULT signal asserted latched. Adjust MODSET until desired optical amplitude achieved. Optical amplitude observed oscilloscope connected optical/electrical converter. VCSEL overshoot ringing improved appropriate selection C10, described Design Procedure section MAX3740 data sheet. improve falling edge VCSEL, adjust (RPEAKSET).
Optical Evaluation Using DS1858 Digital Potentiometer with Monitors
MAX3740 optical evaluation side similar transmitter. this configuration, RMODSET RPWRSET provided DS1858 digital potentiometer. DS1858 also monitors PWRMON BIASMON outputs MAX3740. Control DS1858 provided through two-wire interface TP14 (MOD-DEF2) TP15 (MOD-DEF1). control digital potentiometer, refer DS1858 data sheet.
MAX3740 Evaluation
enable outputs, connect TX_DISABLE placing shunt JU9. Connect common-cathode VCSEL shown Figure Keep leads short reduce reflection. Apply differential input signal (250mV 2200mVP-P) between connectors (IN+ IN-). Attach VCSEL fiber connector optical/electrical converter. Connect +3.3V supply between TP22 (VCCT) TP23 (GND). Adjust power supply until voltage between TP13 ground +3.3V. Adjust RPWRSET resistor using DS1858 until desired average optical power achieved. Refer DS1858 data sheet control instructions. BIAS currents monitored through DS1858 (refer DS1858 data sheet), TP16 (VPWRMON) TP17 (VBIASMON) using following equations:
Evaluates: MAX3740
VPWRMON RPWRSET VBIASMON IBIAS Note: voltage TP16 exceeds VPMTH (0.8V typ) TP17 exceeds VBMTH (0.8V typ), FAULT signal asserted latched. Adjust RMODSET resistor using DS1858 until desired optical amplitude achieved. Optical amplitude observed oscilloscope connected optical/electrical converter. Refer DS1858 data sheet control instructions. needed, change value RPEAKSET (R32) improve falling edge VCSEL.
Adjustment Control Descriptions (see Quick Start)
COMPONENT JU3, JU10 TP14 TP15 NAME Fault Indicator COMP PHOTODIODE TX_DISABLE APCOPEN FAULT SQUELCH POWER VCCEXT RPWRSET RMODSET RPEAKSET RBIASSET MOD-DEF2 MOD-DEF1 FUNCTION illuminated when fault condition occurred (refer Detailed Description section MAX3740 data sheet). Enables/disables circuit. Remove shunt enable circuit. Installing shunt connects photodiode VCSEL pin. Used when VCSEL installed. Enable/disable output currents. Install shunt enable output currents. Determines gain photodiode emulator. When open, gain 0.02A/A. When shunted, gain 0.12A/A. Installing shunt connects electrical output part emulation circuit. Installing shunt enables external fault-indicator circuit. Installing shunt enables squelch function. Installing shunt enables power part. Installing shunt provides power emulation fault-indicator circuits. Adjusts transmit optical power maintained loop. Adjusts laser modulation current. Adjusts peaking falling edge VCSEL. closed-loop configuration, adjusts maximum bias current available APC. open-loop configuration, adjusts bias level output. Adjusts temperature compensation modulation current. Part two-wire interface DS1858. Refer DS1858 data sheet. Part two-wire interface DS1858. Refer DS1858 data sheet.
POWER BLM18HD102SN1 JU10 VCCEXT VCCEXT
TP11 NOISEGEN
TP20 10µF PORTE 10µF 0.01
TP21
0.01 VCCEXT
PHOTODIODE
PWRSET
0.01 FMMT491
0.04
COMP
TX_DISABLE BIASSET
INFAULT SQUELCH
MAX3740
OUT+
0.01
BIASSET
BLM18HD102SN1
0.01
VCCEXT SQUELCH
OUTGND MODSET
FAULT
PEAKSET
VCSEL PHOTODIOD
FMMT491A
FAULT 4.7k 0.01 500k
FAULT
MODSET
TP10 PEAKSET MODSET PEAKSET
Evaluates: MAX3740
CALOUT+ MAX495 BIASMON
APCOPEN
BIAS
PWRMON
BIASMON
TX_DISABLE
COMP
Figure MAX3740 Electrical Schematic
CALOUTTP1 PWRM
CALIN+
CALIN-
BLM18HD102SN1
2.49k
BIASSET
MAX3740 Evaluation
Evaluates: MAX3740
PWRMON
BIASMON
BMON+
TX_DISABLE
VCCT1
BIASSET
VCSEL PHOTODIODE 4.7k 0.01
INFAULT SQUELCH MODSET
MAX3740 Evaluation
MON2
MON1
OUT-
0.01
VCCT1
MAX3740
OUT+
PMON+
PEAKSET
OUT2
VCCT1
4.7k
TP16 PMON+ PMON+ BMON+ BLM18HD102SN1 TP23 0.047 VCCT1 10µF 0.01 0.01 TP17 BMON+ TP22 0.01 TP13 VCCT1 VCCT1
TP14 MOD-DEF
Figure MAX3740 Optical Schematic with DS1858
COMP
TP18 TX_DISABLE
BIAS
1.7k
VCCT1
TP15 MOD-DEF VCCT1
MON3
4.7k VCCT1
OUT1
TP19 FAULT
DS1858
MAX3740 Evaluation Evaluates: MAX3740
1.0"
1.0"
Figure MAX3740 Board Layout-Component Side
Figure MAX3740 Component Placement Guide- Component Side
MAX3740 Evaluation Evaluates: MAX3740
1.0"
Figure MAX3740 Board Layout-Ground Plane
1.0"
Figure MAX3740 Board Layout-Power Plane
MAX3740 Evaluation Evaluates: MAX3740
1.0"
Figure MAX3740 Board Layout-Solder Side
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 2002 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

MAX3740 Evaluation MAX3740 evaluation kit) assembled demonstratio

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