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| 型号： | MAX3740AETG+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | IC DRIVER SFP VCSEL 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 |
| 数据速率： | 3.2Gbps |
| 通道数： | 1 |
| 电源电压： | 2.97 V ~ 3.63 V |
| 电流 - 电源： | 55mA |
| 电流 - 调制： | 15mA |
| 电流 - 偏置： | 15mA |
| 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 |
3.2Gbps SFP VCSEL Driver with Diagnostic
Monitors
Table 2. Circuit Response to Various Single-Point Faults (Closed-Loop APC Configuration)
PIN NAME
FAULT
TX_DISABLE
IN+
IN-
SQUELCH
TC1
TC2
MODSET
PEAKSET
OUT+
OUT-
BIASSET
BIAS
BIASMON
COMP
MD
REF
PWRMON
CIRCUIT RESPONSE TO V CC SHORT
Does not affect laser power.
Modulation and bias current are disabled.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
The laser modulation is increased, but average power
is not affected.
Modulation current is disabled.
Does not affect laser power.
Modulation current is disabled.
Does not affect laser power.
Laser bias is disabled.
Fault state* occurs. Note that VCSEL emissions may
continue; care must be taken to prevent this condition.
Fault state* occurs.
The bias current is reduced, and the average power of
the laser output is reduced.
I BIAS increases to the value determined by R BIASSET ; if
the bias-monitor fault threshold is exceeded, a fault is
signaled.
I BIAS increases to the value determined by R BIASSET ; if
the bias-monitor fault threshold is exceeded, a fault is
signaled.
Fault state* occurs.
CIRCUIT RESPONSE TO GND SHORT
Does not affect laser power.
Normal condition for circuit operation.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
Modulation current is disabled.
The laser modulation is increased, but average power
is not affected.
Does not affect laser power.
Modulation current is disabled.
Does not affect laser power.
Fault state* occurs.
Disables VCSEL.
Does not affect laser power.
I BIAS increases to the value determined by R BIASSET ; if
the bias monitor fault threshold is exceeded, a fault is
signaled.
The bias current is reduced, and the average power of
the laser output is reduced.
The bias current is reduced, and the average power of
the laser output is reduced.
Does not affect laser power.
*A fault state asserts the FAULT pin, disables the modulator output, and disables the bias output.
Modulation Circuit
The modulation circuitry consists of an input buffer, a
current mirror, and a high-speed current switch (Figure
3). The modulator drives up to 15mA of modulation into
a 50 Ω VCSEL load.
The amplitude of the modulation current is set with
resistors at MODSET and temperature coefficient (TC1,
TC2) pins. The resistor at MODSET (R MODSET ) pro-
grams the temperature-stable portion of the modulation
current, and the resistor between TC1 and TC2 (R TC )
programs the temperature coefficient of the modulation
current. For appropriate R TC and R MODSET values, see
the Typical Operating Characteristics section.
Design Procedure
Select Laser
Select a communications-grade laser with a rise time of
260ps or better for 1.25Gbps, or 130ps or better for
2.5Gbps applications. Use a high-efficiency laser that
requires low modulation current and generates a low-
voltage swing. Trim the leads to reduce laser package
inductance. The typical package leads have induc-
tance of 25nH per inch (1nH/mm). This inductance
causes a large voltage swing across the laser. A com-
pensation filter network can also be used to reduce
ringing, edge speed, and voltage swing (see the
Designing the Compensation Filter Network section).
10
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| MAX3741ETE-T | 功能描述:通信集成电路 - 若干 RoHS:否 制造商:Maxim Integrated 类型:Transport Devices 封装 / 箱体:TECSBGA-256 数据速率:100 Mbps 电源电压-最大:1.89 V, 3.465 V 电源电压-最小:1.71 V, 3.135 V 电源电流:50 mA, 225 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube |
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