參數(shù)資料
型號： DS1878T+T&R
廠商： Maxim Integrated Products
文件頁數(shù)： 1/101頁
文件大?。?/td> 0K
描述： IC CTLR SFP W/DGTL LDD RX 28TQFN
標準包裝： 2,500
類型： SFP+ 控制器
輸入類型： 模擬，數(shù)字
輸出類型： 數(shù)字
接口： I²C，LDD，串行
電流 - 電源： 2.5mA
安裝類型： 表面貼裝
封裝/外殼： 28-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 28-TQFN-EP（5x5）
包裝： 帶卷 (TR)
General Description
The DS1878 controls and monitors all functions for SFF,
SFP, and SFP+ modules including all SFF-8472 func-
tionality. The combination of the DS1878 with Maxim
laser driver/limiting amplifier solutions supports VCSEL,
DFB, and EML-based solutions. The device provides
APC loop, modulation current control, and eye safety
functionality. It 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 compo-
nents. Six ADC channels monitor VCC, temperature,
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
additional control functionality.
Applications
SFF, SFP, and SFP+ Transceiver Modules
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, Four 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 a Maxim
Laser Driver/Limiting Amplifier
+2.85V to +5.5V Operating Voltage Range
-40°C to +95°C Operating Temperature Range
28-Pin TQFN (5mm x 5mm x 0.75mm) Package
DS1878
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-5537; Rev 1; 8/11
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.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
*
EP = Exposed pad.
PART
TEMP RANGE
PIN-PACKAGE
DS1878T+
-40°C to +95°C
28 TQFN-EP*
DS1878T+T&R
-40°C to +95°C
28 TQFN-EP*
SFP+ Controller with Digital LDD Interface
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