DS1864K【PDF 1/72 页】KIT EVAL FOR DS1864

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Rev 0; 4/06

SFP Laser Controller and

Diagnostic IC

General Description

The DS1864 is an SFF-8472 multisource agreement

(MSA)-compliant laser controller/monitor that is ideal for

SFP optical-transceiver module designs. It controls laser

driver bias and modulation currents through a pair of tem-

perature-controlled current-sink DACs. System diagnos-

tics are provided by monitoring three analog inputs, V CC ,

and temperature through the internal temperature sensor.

The device also contains all EEPROM required by the

SFF-8472 MSA, including all A0h and A2h EEPROM. The

DS1864’s memory map can be configured to be compati-

ble with both the DS1852/DS1856 and the DS1859 mem-

ory maps. Additionally, memory is secured with customer-

configurable two-level password protection.

Eye-safety features are integrated by three fast-trip

comparators that monitor transmit-power high, transmit-

power low, and bias current. The fast-trip comparators

drive a FET driver output to disable the laser in the case

of eye safety violation.

With its integrated laser driver control, system diagnos-

tics, eye-safety features, and internal temperature sen-

sor, the DS1864 provides an ideal solution for SFP

optical transceiver modules by improving system perfor-

mance, reducing board space, and simplifying design.

Applications

SFP Optical Transceiver Modules

Laser Control and Monitoring

Pin Configuration

Features

? SFF-8472 MSA Compatible

? Five Monitored Channels (Temperature, V CC ,

MON1, MON2, MON3)

Three External Analog Inputs (MON1, MON2,

MON3) Support Internal and External

Calibration

Enhanced RSSI Monitoring (26dB Range, 0.5dB

Accuracy)

Scalable Dynamic Range for External Analog

Inputs

Internal Direct-to-Digital Temperature Sensor

Alarm and Warning Flags for All Monitored

Channels

? Two Linear 8-Bit Current-Sink DACs

Two User-Selectable Full-Scale Ranges (0.5mA

or 1.5mA)

Values Changeable Every 2°C

? Three Fast-Trip Comparators (Tx Power High,

Tx Power Low, and Bias Current) for Eye Safety

? Flexible, Two Level Password Scheme Provides

Three Levels of Security

? Provides All Optional and Required SFF-8472

MSA EEPROM (Both A0h and A2h Memory)

? I 2 C-Compatible Serial Interface

? Operates from a 3.3V or 5V Supply

? -40°C to +95°C Operating Temperature Range

? 28-Pin TQFN Package (5mm x 5mm)

Ordering Information

TOP VIEW

PART

DS1864T

TEMP RANGE

-40°C to +95°C

PIN-PACKAGE

28 TQFN (5mm x 5mm)

DS1864T+

-40°C to +95°C

28 TQFN (5mm x 5mm)

+ Denotes lead-free only package.

RSELOUT

SDA

SCL

V CC

DAC0

GND

INTX-F

INLOS

IN1

N.C.

DS1864

DAC1

MON1P

MON1N

N.C.

Typical Operating Circuit appears at end of data sheet.

TQFN

5mm x 5mm

______________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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