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DS1874T

SFP+ Controller with Digital LDD Interface

Maxim Integrated 

19-4691; Rev 0; 6/09

SFP+ Controller with Digital LDD Interface

General Description

The DS1874 controls and monitors all functions for SFF,

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

tionality. The combination of the DS1874 with the

MAX3798/MAX3799 laser driver/limiting amplifier pro-

vides APC loop, modulation current control, and eye

safety functionality. The DS1874 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, tempera-

ture, and four external monitor inputs (MON1–MON4)

that can be used to meet all monitoring requirements.

MON3 is differential with support for common mode to

VCC. Two digital-to-analog (DAC) outputs with tempera-

ture-indexed lookup tables (LUTs) are available for addi-

tional monitoring and control functionality.

Applications

SFF, SFP, and SFP+ Transceiver Modules

Pin Configuration

TOP VIEW

21 20 19 18 17 16 15

N.C. 22

VCC 23

CSELOUT 24

SCLOUT 25

SDAOUT 26

LOSOUT 27

+

OUT1 28

DS1874

*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

♦ Laser Bias Controlled by APC Loop and

Temperature LUT to Compensate for Tracking

Error

♦ Laser Modulation Controlled by Temperature LUT

♦ 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

♦ Two 9-Bit Delta-Sigma Outputs with 36 Entry

Temperature LUTs

♦ 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

♦ 256 Additional Bytes Located at A0h Slave

Address

♦ I2C-Compatible Interface

♦ 3-Wire Master to Communicate with the MAX3798/

MAX3799 Laser Driver/Limiting Amplifier

♦ +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

DS1874T+

-40°C to +95°C

28 TQFN-EP*

DS1874T+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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