SY88992LMG Ver la hoja de datos (PDF) - Micrel

Número de pieza

componentes Descripción

Fabricante

SY88992LMG

3.3V, 4.25Gbps VCSEL Driver

Micrel 

Micrel, Inc.

SY88992L

Pin Description

Pin Number

2

3

6

Pin Name

DIN+

DIN-

IP_SET1

7

IP_SET2

8

IP_SET3

10

MOD-

11

MOD+

13

IM_SET

14

IPD_SET

16

1, 4, 9, 12

5, 15

/EN

GND

VCC

Pin Function

Non-Inverting Input Data. Internally terminated with 50Ω to a reference voltage.

Inverting Input Data. Internally terminated with 50Ω to a reference voltage.

Peaking Current Setting. Connect this pin to GND and keep pins 7 and 8 open to set

peaking-to-modulation current ratio to 5%. Combinations of the three pins, as shown

in table below, will set different ratios up to 35%.

Peaking Current Setting. Connect this pin to GND and keep pins 6 and 8 open to set

peaking-to-modulation current ratio to 10%. Combinations of the three pins, as shown

in table below, will set different ratios up to 35%.

Peaking Current Setting. Connect this pin to GND and keep pins 6 and 7 open to set

peaking-to-modulation current ratio to 20%. Combinations of the three pins, as shown

in table below, will set different ratios up to 35%.

Inverted Modulation Current Output. Provides modulation current when input data is

negative.

Non-Inverted Modulation Current Output. Provides modulation current when input

data is positive.

Modulation Current Setting. The modulation current is set by applying a 0V to 1.2V

voltage at this pin.

Peaking Duration Setting. The peaking current duration is set by installing a resistor

between this pin and ground. The plot on page 6 shows peaking duration versus the

value of the resistor installed.

A low level signal applied to this pin will enable the output stage of the driver.

Internally pulled down to ground with 75kΩ resistor.

Ground. Ground and exposed pad must be connected to the plane of the most

negative potential.

Supply Voltage. Bypass with a 0.1µF//0.01µF low ESR capacitor as close to VCC pin

as possible.

Truth Table

DIN+

DIN-

/EN

MOD+(1)

L

H

L

H

H

L

L

L

X

X

H

H

Notes:

1. IMOD = 0 when MOD+ = H.

2. Assuming a common anode VCSEL with its cathode tied to MOD+.

Peaking Current-to-Modulation Current Ratio Setting

IP/IMOD 0 % 5 % 10 % 15 % 20 % 25 % 30 % 35 %

IP_SET1 NC GND NC GND NC GND NC GND

IP_SET2 NC NC GND GND NC NC GND GND

IP_SET3 NC NC NC NC GND GND GND GND

MOD-

L

H

H

VCSEL Output(2)

L

H

L

January 2006

3

M9999-011306-A

hbwhelp@micrel.com or (408) 955-1690

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