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PDF DS1874 Data sheet ( Hoja de datos )
| Número de pieza | DS1874 | |
| Descripción | SFP+ Controller | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-4691; Rev 0; 6/09
www.DataSheet4U.com
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 VCC, 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
VCC. Two digital-to-analog (DAC) outputs with tempera-
ture-indexed lookup tables (LUTs) are available for addi-
tional monitoring and control functionality.
Applications
SFF, SFP, and SFP+ Transceiver Modules
Pin Configuration
TOP VIEW
21 20 19 18 17 16 15
N.C. 22
VCC 23
CSELOUT 24
SCLOUT 25
SDAOUT 26
LOSOUT 27
OUT1 28
+
DS1874
*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
♦ 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, 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
♦ 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
♦ I2C-Compatible Interface
♦ 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
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
DS1874T+
-40°C to +95°C
28 TQFN-EP*
DS1874T+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  
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SFP+ Controller with Digital 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 +6V
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 +6V.
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, SDAOUT)
SYMBOL
VCC (Note 1)
VIH:1
CONDITIONS
Low-Level Input Voltage
(SDA, SCL, SDAOUT)
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.)
PARAMETER
Supply Current
Output Leakage
(SDA, SDAOUT, OUT1,
RSELOUT, LOSOUT, TXF)
Low-Level Output Voltage (SDA,
SDAOUT, SCLOUT, CSELOUT,
OUT1, RSELOUT, LOSOUT,
TXDOUT, DAC1, DAC2, TXF)
High-Level Output Voltage
(DAC1, DAC2, SCLOUT,
SDAOUT, CSELOUT, TXDOUT)
TXDOUT Before EEPROM Recall
SYMBOL
ICC (Notes 1, 2)
ILO
IOL = 4mA
VOL
IOL = 6mA
VOH
IOH = 4mA
CONDITIONS
DAC1 and DAC2 Before LUT
Recall
Figure 11
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 
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SFP+ Controller with Digital LDD Interface
Block Diagram
VCC
SDA
SCL
VCC
MON1
MON2
MON3P
MON3N
MON4
TXD
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
13-BIT
ADC
8-BIT
QTs
APC
INTEGRATOR
9-BIT
DELTA-SIGMA
9-BIT
DELTA-SIGMA
3-WIRE
INTERFACE
TEMPERATURE
SENSOR
POWER-ON
ANALOG
INTERRUPT
SEE
FIGURE 12
VCC
REFIN
DAC1
DAC2
SDAOUT
SCLOUT
CSELOUT
TXF
TXDOUT
RSELOUT
SEE
FIGURE 13
OUT1
LOSOUT
DS1874
GND
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 70 Páginas | |
| PDF Descargar | [ Datasheet DS1874.PDF ] | |
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