- 您现在的位置：买卖IC网 > PDF目录20044 > LTC5100EUF#TR (Linear Technology)IC DRIVER VCSEL 3.2GBPS 16QFN PDF资料下载
参数资料
| 型号： | LTC5100EUF#TR |
| 厂商： | Linear Technology |
| 文件页数： | 21/52页 |
| 文件大小： | 0K |
| 描述： | IC DRIVER VCSEL 3.2GBPS 16QFN |
| 标准包装： | 2,500 |
| 类型： | 激光二极管驱动器 |
| 数据速率： | 3.2Gbps |
| 通道数： | 1 |
| 电源电压： | 3.135 V ~ 3.465 V |
| 电流 - 电源： | 54mA |
| 电流 - 调制： | 12mA |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN（4x4） |
| 包装： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页当前第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页
LTC5100
OPERATIO
Figure 19 shows how the LTC5100 achieves a low reflec-
tion coefficient. The unavoidable capacitance of the high
speed driver transistor, bond pads and ESD protection
circuitry (C1) is compensated by the inductance of the
bond wires (L BWA and L BWB ).
The high speed behavior of the circuit in Figure 19 can be
understood in greater detail by examining the simplified
circuit in Figure 20. In Figure 20 the switched current
source (M1 in Figure 19) launches a current step (1)
toward the termination resistor (2A) and toward the trans-
mission line (2B) connected to the laser. The laser is
typically mismatched to the line impedance and reflects a
portion of the incident wave (3) back toward the MODB
pin. There it encounters an L-C-L structure composed of
the bond wires and driver capacitance. This structure is
carefully designed as a lumped element approximation to
the transmission line impedance. It therefore transmits
wave (3) through the IC package without reflecting energy
back toward the laser. The traveling wave passes through
the chip largely unimpeded (4) and is absorbed by the
matched termination resistor, R T .
The matched termination is provided by the termination
resistor, R T , decoupled by capacitor C T . C T forms an AC
short across the entire frequency range contained in the
modulation data.
The termination resistor, R T , need not be 50 ? . 50 ? is best
for electrical testing because it matches the impedance of
most high frequency instruments. R T can be made smaller,
35 ? , for example, to more closely match a laser with low
dynamic impedance or to allow more voltage headroom at
the SRC pin. This may be necessary for lasers that run at
dynamic impedance or if a narrow, high impedance PC
board trace is needed to connect to the laser.
Figure 21 shows that the high speed modulation current is
confined to the ground system, laser and back termination
network. No high speed current circulates in the power
supply where it could cause radiation and interference
problems.
HIGH SPEED DATA INPUTS
The high speed data inputs, IN + and IN – , are internally
terminated in 50 ? and internally AC coupled, eliminating
the need for external termination resistors and AC cou-
pling capacitors. Figure 10 shows the equivalent circuit
for the high speed data pins. By default, the high speed
data inputs are terminated differentially with 100 ? for
compatibility with LVDS, PECL and similar differential
signaling standards (Cml_en = 0). Alternately, the inputs
can be programmed for 50 ? single-ended termination to
the power supply for biasing a current mode logic (CML)
driver. To select CML compatibility, program Cml_en to 1.
Although internally AC coupled, the inputs are biased with
high valued resistors (50k equivalent) to V DD(HS) /2, so the
LTC5100 remains compatible with external AC coupling
capacitors. When externally AC coupled, the inputs self-
bias to approximately V DD(HS) /2.
Internal AC coupling gives the LTC5100 rail-to-rail input
common mode capability. The inputs can be driven as
much as 300mV beyond the rail during peak excursions.
The AC coupling circuit is a distributed highpass filter with
high voltages or high bias currents. R T can be made larger,
70 ? for example, to more closely match a laser with high
4 3
LTC5100
V DD
SRC
MODA
14
11
NO HIGH
SPEED
CURRENT
50 ?
10nF
2A
11
MODA
R T
50 ?
L BWA
C1
L BWB
2B
Z O = R T
10
MODB TRANSMISSION
LINE
3.2Gbps
MODULATOR
M1
MODB
12
10
9
TYP
1
5100 F20
V SS
EXPOSED
PAD
5100 F21
Figure 20. Wave Propagation in the Laser Interconnect
Figure 21. High Speed Current Flow in the Modulation Output
sn5100 5100fs
21
相关PDF资料 |
PDF描述 |
|---|---|
| CAT28LV64H13I20 | IC EEPROM 64KBIT 200NS 28TSOP |
| ACM25DTAS | CONN EDGECARD 50POS R/A .156 SLD |
| W25X40BVSNIG | IC SPI FLASH 4MBIT 8SOIC |
| AMC18DRTS-S93 | CONN EDGECARD 36POS DIP .100 SLD |
| T86D476M016EAAL | CAP TANT 47UF 16V 20% 2917 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC511P | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Optoelectronic |
| LTC5336E | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Optoelectronic |
| LTC-5336E | 功能描述:LED 显示器和配件 3 Digit, Orange RoHS:否 制造商:Avago Technologies 显示器类型:7 Segment 数位数量:2 字符大小:7.8 mm x 14.22 mm 照明颜色:Red 波长:628 nm 共用管脚:Common Anode 工作电压:2.05 V 工作电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 35 C 封装:Tube |
| LTC5336G | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Optoelectronic |
| LTC-5336G | 功能描述:LED 显示器和配件 3 Digit, Green RoHS:否 制造商:Avago Technologies 显示器类型:7 Segment 数位数量:2 字符大小:7.8 mm x 14.22 mm 照明颜色:Red 波长:628 nm 共用管脚:Common Anode 工作电压:2.05 V 工作电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 35 C 封装:Tube |
发布紧急采购，3分钟左右您将得到回复。