DS1873 19-4986 Rev 1 11/09 SFP+ Controller with Analog LDD Interface General Description Features The DS1873 controls and monitors all functions for SFF, Meets All SFF-8472 Control and Monitoring SFP, and SFP+ modules including all SFF-8472 func- Requirements tionality. The DS1873 provides APC loop, modulation Six Analog Monitor Channels: Temperature, V , CC current control, and eye safety functionality. The MON1MON4 DS1873 continuously monitors for high output current, MON1MON4 Support Internal and External high bias current, and low and high transmit power to Calibration ensure that laser shutdown for eye safety requirements Scalable Dynamic Range are met without adding external components. Internal Direct-to-Digital Temperature Sensor Six ADC channels monitor V , temperature, and four Alarm and Warning Flags for All Monitored CC external monitor inputs (MON1MON4) that can be Channels used to meet all monitoring requirements. MON3 is dif- Four 10-Bit Delta-Sigma Outputs with 36 Entry ferential with support for common mode to V . Two CC Temperature LUTs digital-to-analog (DAC) outputs with temperature- Laser Bias Controlled by APC Loop and indexed lookup tables (LUTs) are available for addition- Temperature LUT to Compensate for Tracking al monitoring and control functionality. Error Laser Modulation Controlled by 72-Entry Applications Temperature LUT Two Additional DACs Controlled by One SFF, SFP, and SFP+ Transceiver Modules 72-Entry and One 36-Entry Temperature LUT Pin Configuration Digital I/O Pins: Five Inputs, Five Outputs Comprehensive Fault-Measurement System with Maskable Laser Shutdown Capability TOP VIEW Flexible, Two-Level Password Scheme Provides Three Levels of Security 21 20 19 18 17 16 15 120 Bytes of Password-1 Protected Memory REFIN 22 14 MON1 128 Bytes of Password-2 Protected Memory in MON3N N.C. 23 13 Main Device Address 12 MON3P DAC1 24 256 Additional Bytes Located at A0h Slave Address 25 11 MON4 DAC2 DS1873 2 I C-Compatible Interface V 26 10 TXDOUT CC +2.85V to +3.9V Operating Voltage Range 27 9 RSEL LOSOUT *EP + -40C to +95C Operating Temperature Range 28 8 GND OUT1 28-Pin TQFN (5mm x 5mm) Package 12 3 45 6 7 Ordering Information PART TEMP RANGE PIN-PACKAGE THIN QFN (5mm 5mm 0.8mm) DS1873T+ -40C to +95C 28 TQFN-EP* *EXPOSED PAD. DS1873T+T&R -40C to +95C 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 Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLE RSELOUT GND SCL BIAS SDA MOD TXF GND LOS MON2 IN1 V CC N.C. TXDSFP+ Controller with Analog LDD Interface TABLE OF CONTENTS Absolute Maximum Ratings 5 Recommended Operating Conditions 5 DC Electrical Characteristics .5 MOD, BIAS, DAC1, DAC2 Electrical Characteristics .6 Analog Quick Trip Characteristics .6 Analog Voltage Monitoring Characteristics 6 Digital Thermometer Characteristics .7 AC Electrical Characteristics .7 Timing Characteristics (Control Loop and Quick Trip) .7 2 I C AC Electrical Characteristics 8 Nonvolatile Memory Characteristics .8 Typical Operating Characteristics .9 Pin Description .10 Block Diagram .11 Typical Operating Circuit .12 Detailed Description .12 BIAS DAC/APC Control 12 BIAS and MOD Output Control During Power-Up 13 BIAS and MOD DACs as a Function of Transmit Disable (TXD) .14 APC and Quick-Trip Timing .14 Monitors and Fault Detection .15 Monitors 15 Five Quick-Trip Monitors and Alarms 15 Six ADC Monitors and Alarms .15 ADC Timing 15 Right-Shifting ADC Result .15 Differential MON3 Input 16 Enhanced RSSI Monitoring (Dual-Range Functionality) 16 Low-Voltage Operation 19 Power-On Analog (POA) 19 Delta-Sigma Outputs 19 Digital I/O Pins .21 LOS, LOSOUT 21 IN1, RSEL, OUT1, RSELOUT 21 TXF, TXD, TXDOUT 22 Transmit Fault (TXF) Output .23 Die Identification .23 2 DS1873