Micrel, Inc.

SY88982L

April 2005

3

M9999-0414505

Pin Description

Pin Name

Pin Number

Pin Function

1, 4, 7, 8, 13

GND

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

negative potential.

2DIN+

Non-inverting data input. Internally terminated with 50 to a reference voltage.

3DIN–

Inverting data input. Internally terminated with 50 to a reference voltage.

5, 6

VCC

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

pin as possible.

9, 10

MOD–

Inverted modulation current output. Outputs modulation current when input data is

negative.

11, 12

MOD+

Non-inverted modulation current output. Outputs modulation current when input

data is positive.

14

VREF

Reference Voltage. Install a 0.1 F capacitor between VREF and VCC.

15

IM_SET

Modulation current setting and control. The voltage applied to this pin will set the

modulation current. To be connected to the MIC3000/1 pin 24 (VMOD+). Input

impedance 25K .

16

/EN

A low level signal on this pin will enable the output stage of the driver. Internally

pulled down with 75K .

Truth Table

DIN+

DIN-

/EN

MOD+

(1)

MOD-

Laser Output

(2)

LH

L

H

L

L

HL

L

L

H

H

XX

H

H

L

L

Notes:

2. Assuming that the laser is tied to MOD+.