Micrel SY88216L Manuel utilisateur

SY88216L

Optical Evaluation Board

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

February 2008

M9999-022108-

[email protected] or (408) 955-1690

General Description

This evaluation board allows for checking the

performance of the SY88216 burst mode driver while

driving a laser.

Datasheet and support documentation can be found on

Micrel's web site at: www.micrel.com.

Features

•Open loop or close-loop operation

•Manual modulation, biasmax and bias setting

Related Support Documentation

•SY88216L Datasheet

_______________________________________________________________________________________________________

Evaluation Board

Micrel, Inc. SY88216L Optical Evaluation Board

February 2008 2 M9999-022108-

[email protected] or (408) 955-1690

TOSA Installation

Check the pin-out of the laser and install according to

the diagrams shown in Figure 1.

Figure 1. Mounting of the Laser

Evaluation Board Setting and Operation

1. Install a jumper on SW3 to enable the driver.

2. Continuous Mode Operation: Connect BEN-

to GND or connect BEN+ to VCC to operate the

chip in continuous mode first.

3. Adjust potentiometers VR2 (BIASMAX), VR3

(MODSET), and VR4 (BIASSET) completely

counterclockwise to set bias and modulation

currents to zero “0” before powering the board.

4. If the inputs DIN+/DIN- are DC-coupled, set

the output of the pattern generator high level

within the range 0.5V-2V, first. Then connect

the input (DIN+/DIN-) to the output of the

pattern generator.

5. Connect the laser output to the optical module

of the scope with a SMF jumper.

6. Open Loop Operation: Install a jumper on

SW2 (MOD ON) and make sure that there is

no jumper on SW4 (PD-MD).

7. Connect 3.3V to TP9 (red) and GND to TP10

(black) to power the board.

8. Turn VR2 (BIASMAX) clockwise, BIASMAX

sets the bias current in open loop, to increase

the bias current until the laser starts output

some light then turn VR3 clockwise to set

modulation current. Keep adjusting bias (VR2)

and modulation (VR3) until an acceptable eye

diagram is seen on the scope.

9. Bias Current can be deduced from the voltage

across R7 between TP4 and TP6.

IBIAS = (VTP6 – VTP4) / R7

10. The voltage between TP11 (BIASMON) and

GND (across R4) is proportional to (Bias

Current + Half modulation current):

(IBIAS + IMOD / 2) / 50 = VR4 / R4

11. Close-loop operation: Install jumpers on SW1

(BIAS ON) and SW4 (PD-MD) to close the

loop and turn VR4 clockwise to increase the

bias current. Keep adjusting BIASSET (VR4)

and modulation (VR3) until an acceptable eye

diagram is seen on the scope.

Performance

Figure 2. Optical Eye Diagram

1.25Gbps with 2.3G Filter

Laser Response Tuning

Overshoot/Undershoot

The damping resistors R21 and R22 installed in series

with the laser are 10Ω. This value might be changed

to a higher value to minimize or suppress any

overshoot or undershoot on the optical signal out of

the laser, but keep in mind that higher value damping

resistors will lead to higher rise/fall time and lower

maximum modulation current.

The user can adjust the values of (R19, C8) and/or

(R8, C9) to get better performance with his laser.

Micrel, Inc. SY88216L Optical Evaluation Board

February 2008 3 M9999-022108-

[email protected] or (408) 955-1690

Burst Mode Operation

1. Use the setup diagram below to perform burst

mode operation measurements.

2. Disconnect BEN+ from VCC and BEN- from

GND whichever is connected and connect

BEN inputs to the output of the BEN signal

generator.

3. Connect the trigger output of the BEN signal

generator to the trigger input on the scope.

4. Select the frequency of the BEN signal to have

BEN high for at least 100ns per cycle to give

enough time to the optical signal to settle.

Performance

Micrel, Inc. SY88216L Optical Evaluation Board

February 2008 4 M9999-022108-

[email protected] or (408) 955-1690

Evaluation Board Timing Set-Up

Micrel, Inc. SY88216L Optical Evaluation Board

February 2008 5 M9999-022108-

[email protected] or (408) 955-1690

Evaluation Board Schematic

Micrel, Inc. SY88216L Optical Evaluation Board

February 2008 6 M9999-022108-

[email protected] or (408) 955-1690

PCB Layout/Assembly

Micrel, Inc. SY88216L Optical Evaluation Board

February 2008 7 M9999-022108-

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Bill of Materials

Item Part Number Manufacturer Description Qty.

C1-5, C10 Vishay(1) 0.1µF, Size 0402, Ceramic Capacitor 6

C6, C7 ECSH0GY106R Panasonic(2) 10µF, Y, Tantalium Solid Electrolytic Capacitor 2

C8 Vishay(1) 5pF, Size 0402, Ceramic Capacitor 1

D1 67-1636-1-ND Digikey(3) Red LED 1

J1, J3-5 142-0701-851 Johnson

Components(4)

SMA End Launch Receptacle Connector 4

J2 Vishay(1) TOSA, Laser Subassembly 1

L1 Vishay(1) 1.2µH Ferrite Bead Inductor, Size 1206 1

L2 Vishay(1) 0ΩResistor 1

L3 Vishay(1) 1.2µH Ferrite Bead Inductor, Size 0805 1

Q3, Q4 MMTB3906WT1 ON Semiconductor(5) N-MOSFET 2

R6, R13,

R14

CRCW04020R00F Vishay(1) 0ΩResistor 3

R3, R7, R9,

R21, R22

CRCW040210R0F Vishay(1) 10ΩResistor 5

R19 CRCW040275R0F Vishay(1) 75ΩResistor 1

R16, R18 CRCW040282R0F Vishay(1) 82ΩResistor 2

R1, R2, R4 CRCW04021000F Vishay(1) 100ΩResistor 3

R15, R17 CRCW04021300F Vishay(1) 130ΩResistor 2

R12 CRCW04022700F Vishay(1) 270ΩResistor 1

R11 CRCW04021002F Vishay(1) 10kΩResistor 1

SW1, SW2,

SW3, SW4

TSW-1-2-07-G-S Samtec(6) Header, 2 positions 4

TP10 5011 Keystone(7) Color Coded PCB test point, Black 1

TP1-TP8,

TP11

5014 Keystone(7) Color Coded PCB test point, Yellow 9

TP9 5010 Keystone(7) Color Coded PCB test point, Red 1

U1 SY88216L Micrel, Inc.(8) 2.5G Burst Mode Laser Driver 1

VR2, VR3,

VR4

3269 W-1-503 GLF Bourns(9) 50K SMD Trimming Potentiometer 3

Notes:

1. Vishay:

www.vishay.com.

2. Panasonic:

www.panasonic.com.

3. Digikey:

www.digikey.com.

4. Johnson components: www.johnsoncomponents.com.

5. ON Semiconductor: www.onsemi.com.

6. Samtec:

www.samtec.com.

7. Keystone:

www.keyelco.com.

8. Micrel, Inc.: www.micrel.com.

9. Bourns:

www.bourns.com.

Micrel, Inc. SY88216L Optical Evaluation Board

February 2008 8 M9999-022108-

[email protected] or (408) 955-1690

HBW Support

Hotline: 408-955-1690

Email Support: HBWHelp@micrel.com

MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA

TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com

The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel fo

its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.

Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a

product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended fo

surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant inju

to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and

Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale.

orated.

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