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| 型号： | DS1874T+T&R |
| 厂商： | Maxim Integrated |
| 文件页数： | 13/88页 |
| 文件大小： | 0K |
| 描述： | IC CTLR SFP+ ANLG LDD 28-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 激光二极管控制器 |
| 通道数： | 1 |
| 电源电压： | 2.85 V ~ 3.9 V |
| 电流 - 电源： | 2.5mA |
| 工作温度： | -40°C ~ 95°C |
| 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) |
| 安装类型： | 表面贴装 |
| 其它名称： | 90-1874T+TRL |
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SFP+ Controller with Digital LDD Interface
Table 1. Acronyms
an external resistor. The feedback is sampled by a com-
parator and compared to a digital set-point value. The
ACRONYM
ADC
AGC
APC
APD
ATB
BM
DAC
LOS
LUT
NV
QT
TE
TIA
ROSA
SEE
SFF
SFF-8472
SFP
SFP+
TOSA
TXP
DEFINITION
Analog-to-Digital Converter
Automatic Gain Control
Automatic Power Control
Avalanche Photodiode
Alarm Trap Bytes
Burst Mode
Digital-to-Analog Converter
Loss of Signal
Lookup Table
Nonvolatile
Quick Trip
Tracking Error
Transimpedance Amplifier
Receiver Optical Subassembly
Shadowed EEPROM
Small Form Factor
Document Defining Register Map of SFPs
and SFFs
Small Form Factor Pluggable
Enhanced SFP
Transmit Optical Subassembly
Transmit Power
MODTI
8
MODTC = 0
7
6
output of the comparator has three states: up, down, or
no-operation. The no-operation state prevents the output
from excessive toggling once steady state is reached.
As long as the comparator output is in either the up or
down states, the bias is adjusted by writing increment
and decrement values to the MAX3798/MAX3799
through the BIASINC register (3-wire address 13h).
The DS1874 has an LUT to allow the APC set point to
change as a function of temperature to compensate for
tracking error (TE). The TE LUT has 36 entries that
determine the APC setting in 4°C windows between
-40°C to +100°C.
MODULATION Control
The MAX3798/MAX3799 control the laser modulation
using the internal temperature-indexed LUT within the
DS1874. The modulation LUT is programmed in 2°C
increments over the -40°C to +102°C range to provide
temperature compensation for the laser’s modulation.
The modulation is updated after each temperature con-
version using the 3-wire interface that connects to the
MAX3798/MAX3799. The MAX3798/MAX3799 include a
9-bit DAC. The modulation LUT is 8 bits.
Figure 1 demonstrates how the 8-bit LUT controls the
9-bit DAC with the use of a temperature control bit
(MODTC, Table 02h, Register C6h) and a temperature
index register (MODTI, Table 02h, Register C2h).
MODTI
8
MODTC = 1
7
6
5
MOD LUT
LOADED TO [8:1]
5
MOD LUT
LOADED TO [8:1]
4
3
MOD LUT
LOADED TO [7:0]
(DAC BIT 0 = 0)
4
3
(DAC BIT 0 = 0)
MOD LUT
LOADED TO [7:0]
2
1
0
2
1
0
-40
TEMPERATURE ( ° C)
+102
-40
TEMPERATURE ( ° C)
+102
Figure 1. Modulation LUT Loading to MAX3798/MAX3799 MOD DAC
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1875 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:PON Triplexer and SFP Controller |
| DS1875RT+ | 制造商:Maxim Integrated Products 功能描述:PON TRIPLEXER AND SFP CONTROLLER - Rail/Tube |
| DS1875RT+T&R | 制造商:Maxim Integrated Products 功能描述:PON TRIPLEXER AND SFP CONTROLLER - Tape and Reel |
| DS1875T+ | 功能描述:ADC / DAC多通道 PON Triplexer & SFP Controller 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 |
| DS1875T+T&R | 制造商:Maxim Integrated Products 功能描述:PON TRIPLEXER 38TQFN EP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC SFP CTRLR/TRIPLEXER 38-TQFN 制造商:Maxim Integrated Products 功能描述:ADC / DAC Multichannel PON Triplexer & SFP Controller |
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