SY88905 datasheet(4/10 Pages) MICREL

4 / 10 page

SY88905

Micrel, Inc.

M9999-081005

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

DETAILED DESCRIPTION

The SY88905 is an integrated control circuit for laser

diode modules intended for high-frequency fiber-optic

applications. The device is designed to operate with the

SY88902 laser diode driver providing Automatic Power

Control (APC) which provides bias current control and

monitor diode interface. The device also interfaces with the

SY88903 high-speed limiting amplifier providing chatter-free

Loss of Signal function.

Laser Diode Supply Current

The SY88905 provides the adjustable drive current for

the laser diode, DC bias.

Monitor Diode

The MD pin on the SY88905 provides low frequency

light intensity, laser power out feedback from the monitor

diode in the laser diode package. This feedback is used to

adjust the IBIAS level through the Automatic Power Control

circuit to maintain a near constant power output from the

laser diode.

TA = 0

°CTA = +25°CTA = +85°C

Symbol

Parameter

Min.

Typ.

Max.

Min.

Typ.

Max.

Min.

Typ. Max. Unit

Conditions

ICC

Power Supply Current

—

No output load

IBIAS SET

IBIAS SET Input Current

—

0.9

—

0.9

—

0.9

IBIAS

IBIAS Output Current

0.5

—

0.5

—

0.5

—

ABIAS

IBIAS Current Gain

—

=IBIAS / IBIAS SET

VREF

Reference Voltage

2.30

—

3.30

2.30

2.75

3.30

2.30

—

3.30

IREF = -100

µA

∆VPIN SET

VPIN SET Voltage Tracking

0.95

—

1.35

0.95

1.13

1.35

0.95

—

1.35

=VREF – VPIN SET

∆VBIAS SET VBIAS Voltage Tracking

0.8

—

1.20

0.8

1.0

1.20

0.8

—

1.20

=VREF – VBIAS SET

VCOMP BIAS

Compliance Voltage

0.1

—

1.0

0.1

0.4

1.0

0.1

—

1.0

IBIAS = 15mA

IBIAS FB

Feedback Current(1)

350

—

350

500

—

350

—

µA

ABIAS FB

Feedback Gain(2)

—

DC ELECTRICAL CHARACTERISTICS

VCC = +5V

±10%

Notes:

|IMD – IPIN SET| = 100

µA

|IBIAS FB| / |IMD – IPIN SET|

Note:

1. Individual product specifications over-ride general specifications.

TTL DC ELECTRICAL CHARACTERISTICS

VCC = +5V

±10%

TA = 0

°CTA = +25°CTA = +85°C

Symbol

Parameter

Min.

Max.

Min.

Max.

Min.

Max.

Unit

Condition

VIH

Input HIGH Voltage

2.0

—

2.0

—

2.0

—

VIL

Input LOW Voltage

—

0.8

—

0.8

—

0.8

—

IIH

Input HIGH Current

—

µAVIN = 2.7V

—

100

—

100

—

100

VIN = VCC

IIL

Input LOW Current

—

–0.3

—

–0.3

—

–0.3

VIN = 0.5V

VIK

Input Clamp Voltage

—

–1.2

—

–1.2

—

–1.2

IIN = –12mA

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