Maxim > Products > Optoelectronics > DS1874

DS1874

SFP+ Controller with Digital LDD Interface

Combination of DS1874 and MAX3798/MAX3799 Provides APC Loop, Current Control, and Complete SFF-8472 Functionality

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The DS1874 controls and monitors all functions for SFF, SFP, and SFP+ modules including all SFF-8472 functionality. The combination of the DS1874 with the MAX3798/MAX3799 laser driver/limiting amplifier provides 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 V_CC, temperature, 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 V_CC. Two digital-to-analog (DAC) outputs with temperature-indexed lookup tables (LUTs) are available for additional monitoring and control functionality.

Data Sheet

Download	Rev 0	(PDF, 1.1MB)
E-Mail

An evaluation kit is available: DS1874K

Key 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, V_CC, 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

Applications/Uses

SFF, SFP, and SFP+ Transceiver Modules

Key Specifications:

Fiber Monitoring and Control

Part Number

ADCs

Resolution
(bits)

DACs/ Resistors

FS Out
(kΩ)

Steps

Temp. Sensor

Memory

V_SUPPLY
(V)

Control Interface

EV Kit

Budgetary Price

See Notes

DS1874

5-Input Muxable

2 DACs

None

Internal

EEPROM

2.85 to 3.9

I²C

$1.48 @1k

See All Fiber Monitoring and Control (20)

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Typical Operating Circuit

More Information

New Product Press Release

[ 2009-12-07 ]

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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Document Ref.: 19-4691 Rev 0; 2009-07-07
This page last modified: 2010-01-19