DS1873T-TR 데이터 시트보기 (PDF) - Maxim Integrated

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DS1873T-TR

SFP+ Controller with Analog LDD Interface

Maxim Integrated 

19-4986; Rev 0; 9/09

EVAALVUAAILTAIOBNLEKIT

SFP+ Controller with Analog LDD Interface

General Description

The DS1873 controls and monitors all functions for SFF,

SFP, and SFP+ modules including all SFF-8472 func-

tionality. The DS1873 provides APC loop, modulation

current control, and eye safety functionality. The

DS1873 continuously monitors for high output current,

high bias current, and low and high transmit power to

ensure that laser shutdown for eye safety requirements

are met without adding external components.

Six ADC channels monitor VCC, temperature, and four

external monitor inputs (MON1–MON4) that can be

used to meet all monitoring requirements. MON3 is dif-

ferential with support for common mode to VCC. Two

digital-to-analog (DAC) outputs with temperature-

indexed lookup tables (LUTs) are available for addition-

al monitoring and control functionality.

Applications

SFF, SFP, and SFP+ Transceiver Modules

Pin Configuration

TOP VIEW

21 20 19 18 17 16 15

REFIN 22

N.C. 23

DAC1 24

DAC2 25

VCC 26

LOSOUT 27

+

OUT1 28

DS1873

*EP

14 MON1

13 MON3N

12 MON3P

11 MON4

10 TXDOUT

9 RSEL

8 GND

1 234567

*EXPOSED PAD.

THIN QFN

(5mm × 5mm × 0.8mm)

Features

♦ Meets All SFF-8472 Control and Monitoring

Requirements

♦ Six Analog Monitor Channels: Temperature, VCC,

MON1–MON4

MON1–MON4 Support Internal and External

Calibration

Scalable Dynamic Range

Internal Direct-to-Digital Temperature Sensor

Alarm and Warning Flags for All Monitored

Channels

♦ Four 10-Bit Delta-Sigma Outputs with 36 Entry

Temperature LUTs

Laser Bias Controlled by APC Loop and

Temperature LUT to Compensate for Tracking

Error

Laser Modulation Controlled by 72-Entry

Temperature LUT

Two Additional DACs Controlled by One

72-Entry and One 36-Entry Temperature LUT

♦ Digital I/O Pins: Five Inputs, Five Outputs

♦ Comprehensive Fault-Measurement System with

Maskable Laser Shutdown Capability

♦ Flexible, Two-Level Password Scheme Provides

Three Levels of Security

♦ 120 Bytes of Password-1 Protected Memory

♦ 128 Bytes of Password-2 Protected Memory in

Main Device Address

♦ 256 Additional Bytes Located at A0h Slave

Address

♦ I2C-Compatible Interface

♦ +2.85V to +3.9V Operating Voltage Range

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

♦ 28-Pin TQFN (5mm x 5mm) Package

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

DS1873T+

-40°C to +95°C

28 TQFN-EP*

DS1873T+T&R

-40°C to +95°C

28 TQFN-EP*

+Denotes a lead(Pb)-free/RoHS-compliant package.

T&R = Tape and reel.

*EP = Exposed pad.

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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