参数资料
| 型号： | MAX3967AETG+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 8/14页 |
| 文件大小： | 0K |
| 描述： | IC SFP LED DRVR 24-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 激光二极管驱动器，用于光纤模块 |
| 数据速率： | 270Mbps |
| 通道数： | 1 |
| 电源电压： | 2.97 V ~ 5.5 V |
| 电流 - 电源： | 30mA |
| 电流 - 调制： | 可调式 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
270Mbps SFP LED Driver
Table 1. LED Prebias Voltage
See the Modulation Current Tempco vs. R TC graph in
the Typical Operating Characteristics to program a cus-
PB1
Open
V EE
Open
V EE
Open
V EE
Open
PB2
Open
Open
V EE
V EE
Open
Open
V EE
PB3
Open
Open
Open
Open
V EE
V EE
V EE
PREBIAS (V)
0.400
0.475
0.550
0.625
0.700
0.775
0.850
tom tempco. From the graph, determine the appropriate
resistor and connect it between TCMIN and TC.
For example, if an LED requires a 5000ppm/°C tempco,
choose R TC of 8.3k ? .
Program the Modulation Current
Determine the required modulation current at T A = +25°C.
Then select the appropriate value of R MODSET from the
Modulation Current vs. R MODSET graph in the Typical
Operating Characteristics .
I PEAK = LED PREBIAS
V EE V EE V EE 0.925
internal compensation. The compensation network can
be optimized by adding additional components
between V CCOUT and OUT+.
The MAX3967A includes a complementary output dri-
ver, which is switched 180° out of phase with the main
output. This configuration helps to maintain constant
current flow from the voltage supply, reducing noise
and EMI. A large diode and a 5 ? resistor are connect-
ed in series with the negative output (OUT-) to emulate
the LED load at OUT+.
Peaking Current
The prebias resistor provides peaking current to improve
the LED switching speed. The peaking magnitude is
given by the following equation:
V -V
78 ?
The peaking amplitude is equal for rising and falling
data transitions.
Design Procedure
Select an LED
For best performance, select a high-efficiency, low-
inductance LED. LED inductance causes large voltage
swings and ringing.
Program the Modulation-Current Tempco
Select a modulation-current tempco that provides near-
ly constant LED output power as temperature varies.
For the minimum tempco, connect TCMIN to the TC pin.
For a tempco of approximately 3600ppm/°C, connect
TC to TCNOM and leave TCMIN unconnected. For the
maximum tempco, leave TCMIN, TCNOM, and TC
unconnected.
For example, to program 75mA modulation current, the
graph indicates an R MODSET value of 750 ? for maxi-
mum tempco (12,000ppm/°C) and 1k ? for nominal
tempco (3600ppm/°C). By interpolation, choose an
R MODSET of 792 ? for a tempco of 5000ppm/°C.
Program Prebias Voltage
Determine the LED prebias voltage that produces an
acceptable trade-off between peaking current and extinc-
tion ratio. See Table 1 for PB1, PB2, and PB3 settings.
Layout Considerations
For optimum performance, total load inductance should
not exceed 10nH. Load inductance includes LED
inductance, LED package lead inductance, and circuit-
board traces. Keep the connections between the
MAX3967A OUT pins and the LED as short as possible
to minimize inductance.
Chip-and-wire (hybrid) technology reduces package
inductance significantly, and provides the best possible
performance.
Use good high-frequency layout techniques and a
multilayer board with an uninterrupted ground plane.
Power supplies should be capacitively bypassed to the
ground plane with surface-mount capacitors located
near the power-supply pins.
8
_______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| MAX3996CTP+T | IC LASR DRVR 2.5GBPS 5.5V 20TQFN |
| MAX4193CSA+T | IC REG BOOST 525MA 8SOIC |
| MAX4806CTN+T | IC DGTL PULSER DUAL 56TQFN |
| MAX4820ETP+T | IC RELAY DRIVER 8CHAN 20-TQFN |
| MAX4823ETP+T | IC RELAY DRIVER 8CHAN 20-TQFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX3967AEVKIT | 功能描述:LED 照明开发工具 Evaluation Kit for the MAX3967A RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| MAX3967E/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX3967ETG | 制造商:Maxim Integrated Products 功能描述:270MBPS SFP LED DRIVER - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX3967ETG+ | 制造商:Maxim Integrated Products 功能描述:LED DRVR 2.97V TO 5.5V 24TQFN - Bulk |
| MAX3967ETG+T | 制造商:Maxim Integrated Products 功能描述:LED DRVR 2.97V TO 5.5V 24TQFN - Tape and Reel |
发布紧急采购，3分钟左右您将得到回复。