Microchip SY88982L Manual

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Side 1/5

2.5Gbps FP/DFB Laser Drivers

SY88982L 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

April 2005 M9999-04150

hbwhelp@micrel.com or (408) 955-169

General Description

The SY88982L evaluation board is designed for fast

evaluation of the SY88982L, SY88782L, and SY88932L

laser drivers.

A picture of the board loaded with SY88982L is shown

below.

All data sheets and support documentation can be found

on Micrel’s web site at: www.micrel.com.

Features

• Single 3.3V supply voltage

• AC-coupled inputs

• AC/DC-coupled outputs

• Positive ground to allow for DC-coupling outputs to

test equipment.

AC/DC compliance voltage evaluation

Related Documentation

• SY88982L, 3.3V, 2.7Gbps High Current Low Power

Laser Driver for FP/DFB Lasers

_______________________________________________________________________________________________________

Evaluation Board

Micrel, Inc. SY88982L Evaluation Board

April 2005 2M9999-04150

hbwhelp@micrel.com or (408) 955-169

Evaluation Board Description and

Setting

The evaluation board consists of a four-layer FR4

board. The inputs of the driver are AC-coupled and

are accessible through SMA connectors. The board

has a positive ground (VCC is the ground) that will

allow for DC coupling to the scope if needed. There

are two power supply connectors on the board, TP1

for VCC (Ground) and TP5 (VCC2) to be used for AC

compliance voltage measurement only.

Board Setting

Jumper installed on JP1.

R1 = R2 = 50 to make a 25 load when the scope is

connected to J3-4.

Board Operation

Use SMA connectors, J1-J2, to connect a signal to the

driver’s inputs. J3-J4 are the driver’s outputs, to be

connected to the scope.

Install a jumper on JP1 for normal operation.

Connect the power supply between TP1 (VCC1) and

TP5 (VEE). TP2 (VCC2) is not connected for normal

operation and is reserved for AC-compliance voltage

measurement.

Adjust the modulation current with potentiometer R4.

The modulation current can be measured with one of

the following methods:

1. Measure the output swing on the scope and

divide it by the load (R1 // 50  or R2 // 50 ).

The board comes with a 25 load (50  //

50).

2. Measure the IM_SET voltage at pin 2 (central

pin) of the potentiometer (R4) and use the

modulation gain curve below to deduce IMOD.

Figure 1. Modulation Gain vs. IM_SET

AC Compliance Voltage Measurement

Remove jumper from JP1 and apply a separate 3.3V

variable voltage source (VCC2) on TP5.

Set modulation current to any value between 10mA

and 90mA. For currents more than 70mA, a lower

load, 15 for example (22//scope), must be used to

avoid saturation of the driver’s output.

Apply a valid signal at the input of the driver to get a

clean eye at the output (MOD-), than decrease VCC2

slowly until the eye at MOD- starts to degrade. Record

the value of VCC2 (VCC2_sat) just before the eye

starts to degrade (the driver starts to saturate). The

compliance voltage is the voltage VMOD-_sat at

MOD- given by:

VMOD-_sat = (R1 x VCC + 50 x VCC2_sat)/(R1+50) –

IMOD x 50 x R1/(R1+50).

Where 50 is the scope input impedance.

OFF Modulation Current Measurement

Set the board back to normal operation by

disconnecting TP5 and installing a jumper on JP1.

Connect TP4 to VCC to disable the driver.

Measure the modulation current using methods

described above (board operation section).

Figure 2. Example of Eye Diagram

@ 2.5Gbps with 25



 load

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	SY88982L

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