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Maxim Integrated Products - SFP+ Controller

Numéro de référence DS1873
Description SFP+ Controller
Fabricant Maxim Integrated Products 
Logo Maxim Integrated Products 





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DS1873 fiche technique
19-4986; Rev 1; 11/09
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
www.DataSheetD4AUC1.co2m4
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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