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DS1874T+TR

Description
SFP Controller with Digital LDD Interface
File Size1MB,88 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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DS1874T+TR Overview

SFP Controller with Digital LDD Interface

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 V
CC
, 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
V
CC
. Two digital-to-analog (DAC) outputs with tempera-
ture-indexed lookup tables (LUTs) are available for addi-
tional monitoring and control functionality.
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
I
2
C-Compatible Interface
DS1874
Applications
SFF, SFP, and SFP+ Transceiver Modules
Pin Configuration
DAC1
REFIN
DAC2
GND
GND
V
CC
15
14
13
12
DS1874
11
10
MON1
MON3N
MON3P
MON4
TXDOUT
RSEL
GND
TOP VIEW
21
N.C. 22
V
CC
23
CSELOUT 24
SCLOUT 25
SDAOUT 26
LOSOUT 27
OUT1 28
1
RSELOUT
20
19
18
17
16
MON2
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
+
2
SCL
3
SDA
4
TXF
5
LOS
*EP
9
8
Ordering Information
PART
TEMP RANGE
-40°C to +95°C
-40°C to +95°C
PIN-PACKAGE
28 TQFN-EP*
28 TQFN-EP*
DS1874T+
DS1874T+T&R
6
IN1
7
TXD
THIN QFN
(5mm
×
5mm
×
0.8mm)
*EXPOSED PAD.
+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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