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参数资料
| 型号： | DS1877T+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/65页 |
| 文件大小： | 0K |
| 描述： | IC CTLR/MON SFP 1-2CH 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | SFP+ 控制器 |
| 输入类型： | 逻辑 |
| 输出类型： | 逻辑 |
| 接口： | I²C |
| 电流 - 电源： | 2.5mA |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
| 其它名称： | 90-1877T+TRL |
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13
Maxim Integrated
SFP Controller for Dual Rx Interface
DS1877
Detailed Description
The DS1877 integrates the control and monitoring func-
tionality required in an SFP or SFP+ system. The device
is specifically designed for a dual-receiver SFP module.
Key components of the device are shown in the Block
Diagram and described in subsequent sections.
DACs During Power-Up
On power-up, the device sets the DACs to high imped-
ance. After time tINIT, the DACs are set to an initial con-
dition set in EEPROM. After a temperature conversion is
completed and if the VCC LO alarm is enabled, an addi-
tional VCC conversion above the customer-defined VCC
LO alarm level is required before the DACs are updated
with the value determined by the temperature conversion
and the DAC LUT. See Figure 1.
Quick-Trip Timing
As shown in Figure 2, the device’s input comparator is
shared between two LOS comparisons. The comparator
polls the alarms in a multiplexed sequence. The com-
parator checks the LOS (RSSI1_ and RSSI2_) signals
against the internal reference. Depending on the results
of the comparison, the corresponding alarms and warn-
ings are asserted or deasserted. Any QT alarm that is
detected by default remains active until a subsequent
comparator sample shows that the condition no longer
exists.
Table 1. Acronyms
Figure 1. Power-Up Timing
Figure 2. Quick-Trip Sample Timing
VCC
VPOA
DAC
SETTINGS
HIGH IMPEDANCE
OFF STATE
LUT VALUE
500s
tINIT
QUICK-TRIP SAMPLE TIMES
LOS2
LOS1
LOS2
tREP
ACRONYM
DESCRIPTION
ADC
Analog-to-Digital Converter
AGC
Automatic Gain Control
APC
Automatic Power Control
APD
Avalanche Photodiode
ATB
Alarm Trap Bytes
DAC
Digital-to-Analog Converter
LOS
Loss of Signal
LUT
Lookup Table
NV
Nonvolatile
QT
Quick Trip
TIA
Transimpedance Amplifier
ROSA
Receiver Optical Subassembly
SEE
Shadowed EEPROM
SFF
Small Form Factor
SFF-8472
Document Defining Register Map of SFPs
and SFFs
SFP
Small Form Factor Pluggable
SFP+
Enhanced SFP
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1878 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:SFP+ Controller with Digital LDD Interface |
| DS1878T | 功能描述:ADC / DAC多通道 SFP+ Controller w/ MAX3946&3945 RoHS:否 制造商:Texas Instruments 转换速率: 分辨率:8 bit 接口类型:SPI 电压参考: 电源电压-最大:3.6 V 电源电压-最小:2 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-40 |
| DS1878T TR | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:SFP+ Controller with Digital LDD Interface |
| DS1878T+ | 功能描述:ADC / DAC多通道 SFP+ Controller w/ MAX3946&3945 RoHS:否 制造商:Texas Instruments 转换速率: 分辨率:8 bit 接口类型:SPI 电压参考: 电源电压-最大:3.6 V 电源电压-最小:2 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-40 |
| DS1878T+T | 功能描述:ADC / DAC多通道 SFP+ Controller w/ MAX3946&3945 RoHS:否 制造商:Texas Instruments 转换速率: 分辨率:8 bit 接口类型:SPI 电压参考: 电源电压-最大:3.6 V 电源电压-最小:2 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-40 |
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