Micrel KSZ8895 User Manual download pdf (Page 50)

February 2011 49 Micrel, Incorporated

LASER DIODE DRIVER

SY84782U

TEMP

EEPROM

SMBus

I/F

ADC

LOGIC

DATA

MIC3003GFL

MODULATION

NVRAM

DATA

LUT

RX Power Monitor

TX Power Monitor

MODSET

APCSET

DAC

APC

DATA

CLK

LOS

LORTNOC REWOP XT ROF KCABDEEF

Light

TOSA

Light

ROSA

POST AMP

SY84113BU

DAC

IMSET

SFP/SFF Optical Module

Communications Product Highlight — Lowest Power SFP

The MIC3003GFL is a ber optic module controller which enables the

implementation of sophisticated, hot-pluggable ber optic transceivers

with intelligent laser control and an internally calibrated Digital Diagnostic

Monitoring Interface per SFF-8472. It essentially integrates all non-data

path functions of an SFP/SFP+ transceiver into a tiny (3mm x 3mm) QFN

package. It also works well as a microcontroller peripheral in transponders or

10Gbps transceivers. The MIC3003GFL uses the same die as the MIC3003

with all its functions, but in a smaller package and different pin out.

Communication with the MIC3003 is via an industry standard 2-wire SMBus

serial interface. Nonvolatile memory is provided for serial ID, conguration,

and separate OEM and user scratchpad spaces.

The SY84782U is a single 2.5V supply, ultra-low power, small form factor la-

ser diode driver for telecom/datacom applications. Intended to drive FP/DFB

lasers at data rates up to 1.25Gbps, it is especially useful for Compact SFP,

SFP and SFF modules where power requirements are quite stringent. The

driver can deliver modulation current up to 90mA and offers a high compliance

voltage, all of which make the SY84782U suitable for high current operations

in both AC- and DC-coupled applications.

The SY84782U is intended to be used with Micrel’s MIC3003 Optical Trans-

ceiver Management IC, which allows for both modulation and bias current

control and monitoring. Furthermore, the MIC3003 offers power control and

temperature compensation.

The SY84113BU low power limiting post amplier is designed for use in ber-

optic optical modules for multirate applications up to 1.25Gbps. The device

connects to a typical transimpedance amplier (TIA) and can produce output

signals to CML-level waveforms. Intended for use in GbE and Fibre Channel

applications, the SY84113BU offers a wide LOS range. It is able to detect input

signals for as low as 5mV

and as high as 100mV

. The SY84113BU is

intended to be used in AC-coupled input applications.

The SY84113BU generates a Loss-of-Signal (LOS) open-collector TTL

output. A programmable Loss-of-Signal level set pin (LOSLVL) sets the

sensitivity of the input amplitude detection. LOS asserts high if the in-

put amplitude falls below the threshold set by LOSLVL and de-asserts low

otherwise. The enable input (/EN) de-asserts the true output signal with-

out removing the input signal. The LOS output can be fed back to the /EN

input to implement the squelch function that maintains output stability under a

loss-of-signal condition.

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Micrel KSZ8895 User Manual Page 50

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