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PDF DS1873 Data sheet ( Hoja de datos )
| Número de pieza | DS1873 | |
| Descripción | SFP+ Controller | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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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.
1 page  
SFP+ Controller with Analog LDD Interface
ABSOLUTE MAXIMUM RATINGS
Voltage Range on MON1–MON4, RSEL,
IN1, LOS, TXF, and TXD Pins
Relative to Ground .................................-0.5V to (VCC + 0.5V)*
Voltage Range on VCC, SDA, SCL, OUT1,
RSELOUT, and LOSOUT Pins
Relative to Ground..............................................-0.5V to +4.2V
Operating Temperature Range ...........................-40°C to +95°C
Programming Temperature Range .........................0°C to +95°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature...........................Refer to the IPC/JEDEC
J-STD-020 Specification.
*Subject to not exceeding +4.2V.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
(TA = -40°C to +95°C, unless otherwise noted.)
PARAMETER
Main Supply Voltage
High-Level Input Voltage
(SDA, SCL)
SYMBOL
VCC (Note 1)
VIH:1
CONDITIONS
Low-Level Input Voltage
(SDA, SCL)
VIL:1
High-Level Input Voltage
(TXD, TXF, RSEL, IN1, LOS)
VIH:2
Low-Level Input Voltage
(TXD, TXF, RSEL, IN1, LOS)
VIL:2
MIN
+2.85
0.7 x
VCC
-0.3
2.0
TYP
MAX
+3.9
VCC +
0.3
0.3 x
VCC
VCC +
0.3
UNITS
V
V
V
V
-0.3
+0.8
V
DC ELECTRICAL CHARACTERISTICS
(VCC = +2.85V to +3.9V, TA = -40°C to +95°C, unless otherwise noted.)
www.DataSheet4U.com
PARAMETER
SYMBOL
CONDITIONS
Supply Current
Output Leakage
(SDA, OUT1, RSELOUT,
LOSOUT, TXF)
ICC (Notes 1, 2)
ILO
Low-Level Output Voltage
(SDA, MOD, BIAS, OUT1,
RSELOUT, LOSOUT, TXDOUT,
DAC1, DAC2, TXF)
IOL = 4mA
VOL
IOL = 6mA
High-Level Output Voltage
(MOD, BIAS, DAC1, DAC2,
TXDOUT)
VOH
IOH = 4mA
TXDOUT Before EEPROM Recall
See Figure 14
MOD, BIAS, DAC1, and DAC2
Before LUT Recall
See Figure 12
Input Leakage Current
(SCL, TXD, LOS, RSEL, IN1)
ILI
Digital Power-On Reset
Analog Power-On Reset
POD
POA
MIN TYP MAX UNITS
2.5 10
mA
1 μA
VCC -
0.4
10
10
1.0
2.0
0.4
0.6
100
100
1
2.2
2.75
V
V
nA
nA
μA
V
V
_______________________________________________________________________________________ 5
5 Page 
SFP+ Controller with Analog LDD Interface
Block Diagram
VCC
SDA
SCL
VCC
MON1
MON2
MON3P
MON3N
MON4
TXD
www.DataSheet4U.com
RSEL
IN1
LOS
VCC
I2C
INTERFACE
EEPROM
256 BYTES
AT A0h
MAIN MEMORY
EEPROM/SRAM
ADC CONFIGURATION/RESULTS,
SYSTEM STATUS/CONTROL BITS,
ALARMS/WARNINGS,
LOOKUP TABLES,
USER MEMORY
DAC1
10 BITS
DAC2
10 BITS
MOD DAC
10 BITS
13-BIT
ADC
8-BIT
QTs
APC
INTEGRATOR
BIAS DAC
10 BITS
TEMPERATURE
SENSOR
POWER-ON
ANALOG
INTERRUPT
LOGIC
CONTROL
VCC
LOGIC
CONTROL
DS1873
REFIN
DAC1
DAC2
MOD
BIAS
TXF
TXDOUT
RSELOUT
OUT1
LOSOUT
GND
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet DS1873.PDF ] | |
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