DS1873 Datasheet, PDF (1/85 Pages) Maxim Integrated Products – SFP+ Controller with Analog LDD Interface

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 V_CC, 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 V_CC. 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
V_CC 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, 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
♦ 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.