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参数资料
| 型号： | MAX3735AETG+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 13/18页 |
| 文件大小： | 0K |
| 描述： | IC LSR DRVR 2.7GBPS 3.63V 24TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 类型： | 激光二极管驱动器（光纤） |
| 数据速率： | 2.7Gbps |
| 通道数： | 1 |
| 电源电压： | 2.97 V ~ 3.63 V |
| 电流 - 电源： | 27mA |
| 电流 - 调制： | 85mA |
| 电流 - 偏置： | 100mA |
| 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： | 管件 |
| 安装类型： | 表面贴装 |
| 产品目录页面： | 1423 (CN2011-ZH PDF) |
2.7Gbps, Low-Power SFP Laser Drivers
Input Termination Requirements
The MAX3735/MAX3735A data inputs are SFP MSA
compliant. On-chip 100 ? differential input impedance is
provided for optimal termination (Figure 6). Because of
the on-chip biasing network, the MAX3735/MAX3735A
inputs self-bias to the proper operating point to accom-
modate AC-coupling.
Optional Shutdown Output Circuitry
The SHUTDOWN control output features extended eye
safety when the laser cathode is grounded. An external
transistor is required to implement this circuit (Figure 4).
In the event of a fault, SHUTDOWN asserts high, plac-
ing the optional shutdown transistor in cutoff mode and
thereby shutting off the laser current.
Applications Information
An example of how to set up the MAX3735/MAX3735A
follows:
Select a communications-grade laser for 2.488Gbps.
Assume that the laser output average power is PAVG =
0dBm, the operating temperature is -40°C to +85°C,
minimum extinction ratio is 6.6 (8.2dB), and the laser
diode has the following characteristics:
Wavelength: λ = 1.3μm
Threshold current: I TH = 22mA at +25°C
Threshold temperature coefficient: β TH = 1.3% / °C
Laser-to-monitor transfer: ρ MON = 0.2A/W
Laser slope efficiency: η = 0.05mW/mA at +25°C
V CC
Determine R APCSET
The desired monitor diode current is estimated by I MD
= P AVG x ρ MON = 200μA. The Monitor Diode vs. R APC-
SET graph in the Typical Operating Characteristics sec-
tion shows that R APCSET should be 3k ? . The value can
also be estimated using the equation below:
I MD = 1.23 / (2 × R APCSET )
Determine R MODSET
To achieve a minimum extinction ratio (r e ) of 6.6 over
temperature and lifetime, calculate the required extinc-
tion ratio at +25°C. Assuming the results of the calcula-
tion are r e = 20 at +25°C, the peak-to-peak optical
power P P-P = 1.81mW, according to Table 3. The
required modulation current is 1.81mW / (0.05mW/mA)
= 36.2mA. The Modulation Current vs. R MODSET graph
in the Typical Operating Characteristics section shows
that R MODSET should be 9.5k ? . The value can also be
estimated using the equation below:
I MOD = 1.23 / (0.0037 × R MODSET )
Determine C APC
In order to meet SFP timing requirements and minimize
pattern-dependent jitter, the CAPC capacitor value is
determined by the laser-to-monitor transfer and other
variables. The following equations and table can be
used to choose the CAPC values for the MAX3735 and
MAX3735A, respectively. The equations and table
assume a DC-coupled laser. Refer to Maxim
Application Note HFDN 23.0: Choosing the APC Loop
V CC
MAX3735
MAX3735A
16k ?
MAX3735
PACKAGE
IN+
0.11pF
PACKAGE
0.97nH
V CC
50 ?
MAX3735A
0.81nH
0.11pF
0.99nH
OUT-
OUT+
0.11pF
V CC
50 ?
IN-
0.97nH
0.99nH
OUT+
0.11pF
24k ?
0.11pF
K = 0.3
Figure 6. Simplified Input Structure
Figure 7. Simplified Output Structure
______________________________________________________________________________________
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX3735AETG+ | 功能描述:激光驱动器 2.7Gbps Low-Power SFP Laser Driver RoHS:否 制造商:Micrel 数据速率:4.25 Gbps 工作电源电压:3 V to 3.6 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:QFN-16 封装:Tube |
| MAX3735AETG+T | 功能描述:激光驱动器 2.7Gbps Low-Power SFP Laser Driver RoHS:否 制造商:Micrel 数据速率:4.25 Gbps 工作电源电压:3 V to 3.6 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:QFN-16 封装:Tube |
| MAX3735AETG-T | 功能描述:激光驱动器 2.7Gbps Low-Power SFP Laser Driver RoHS:否 制造商:Micrel 数据速率:4.25 Gbps 工作电源电压:3 V to 3.6 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:QFN-16 封装:Tube |
| MAX3735AEVKIT | 功能描述:激光驱动器 Evaluation Kit for the MAX3735A RoHS:否 制造商:Micrel 数据速率:4.25 Gbps 工作电源电压:3 V to 3.6 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:QFN-16 封装:Tube |
| MAX3735E/D | 功能描述:激光驱动器 RoHS:否 制造商:Micrel 数据速率:4.25 Gbps 工作电源电压:3 V to 3.6 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:QFN-16 封装:Tube |
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