参数资料
| 型号： | MAX3656ETG+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 11/15页 |
| 文件大小： | 0K |
| 描述： | IC LASR DRVR 2.5GBPS 3.6V 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： | 2.5Gbps |
| 通道数： | 1 |
| 电源电压： | 3 V ~ 3.6 V |
| 电流 - 电源： | 40mA |
| 电流 - 调制： | 85mA |
| 电流 - 偏置： | 70mA |
| 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： | 1422 (CN2011-ZH PDF) |
155Mbps to 2.5Gbps Burst-Mode
Laser Driver
Programming the APC Loop
When using the MAX3656’s APC feature, program the
average optical power by adjusting the APCSET resis-
tor. To select this resistor, determine the desired moni-
tor current to be maintained over temperature and
lifetime. See the I MD vs. R APCSET graph in the Typical
Operating Characteristics and select the value of
R APCSET that corresponds to the required current.
Setting the LONGB Input Pin
Set the LONGB pin according to Table 2 to optimize
APC loop operation.
Interfacing with Laser Diodes
The laser modulation current output OUT+ is optimized
to drive a 15 Ω load and must be DC-coupled. A series
damping resistor, R D , provides impedance matching to
the laser diode. The combined value of the series
BIAS- pin is connected through a 10 Ω resistor and
switching diode to V CC .
Input Termination Requirements
The MAX3656 data and BEN inputs are internally biased.
Although the inputs are compatible with LVPECL signals,
it is not necessary to drive the MAX3656 with a standard
LVPECL signal. While DC-coupled, the MAX3656 oper-
ates properly as long as the specified common-mode
voltage and differential voltage swings are met.
Because of the on-chip biasing network (Figure 3), the
MAX3656 inputs self-bias to the proper operating point
to accommodate AC-coupling.
See Figures 4 and 5 for connecting to PECL or CML
data outputs.
damping resistor and the laser diode equivalent series
resistance should be close to 15 Ω . An RC shunt com-
pensation network, R COMP /C COMP , connected between
the laser diode cathode and ground should be provided
V CC
V CC
V CC
to reduce optical output aberrations and duty-cycle dis-
tortion caused by laser diode parasitic inductance. The
values of R COMP and C COMP can be adjusted to match
IN+
5k Ω
16k Ω
the laser diode and PC board layout characteristics for
optimal optical eye performance (refer to Application
Note 274: HFAN-02.0: Interfacing Maxim’s Laser Drivers
with Laser Diodes). The OUT- pin is connected through
a 15 Ω resistor and switching diode to the laser diode
anode. The switching diode at OUT- improves the opti-
IN-
V CC
5k Ω
cal output eye and burst-enable delay by better match-
ing the laser diode characteristics.
For data rates greater than 1Gbps, a parallel RL peak-
ing network, R P /L P , connected between the laser diode
anode and V CC is recommended. This network creates
a differential drive for the laser diode to improve
rise/fall times and reduce jitter. The values of R P and
V CC
V CC
24k Ω
MAX3656
V CC
L P are also adjusted to match the laser diode and PC
board layout characteristics for optimal optical eye
performance.
Current in the BIAS output switches at high speed
when bursting; therefore, the BIAS+ pin should be con-
nected directly through a resistor, equal to R D as
determined above, to the laser diode cathode. The
Table 2. Setting the LONGB Input Pin
BEN+
BEN-
V CC
5k Ω
5k Ω
16k Ω
LONGB
0
0 or 1
1
CONDITION
Burst on-time ≤ 1.2μs
Burst on-time > 1.2μs or
continuous mode operation
Data rates of 155Mbps
24k Ω
Figure 3. MAX3656 Internal Biasing
______________________________________________________________________________________
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX3656ETG+ | 功能描述:激光驱动器 .155-2.5Gbps Burst Mode 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 |
| MAX3656ETG+ | 制造商:Maxim Integrated Products 功能描述:IC LASER DIODE DRIVER 2.5GBPS TQFN-24 |
| MAX3656ETG+D | 制造商:Maxim Integrated Products 功能描述:LASER DRVR 2.5GBPS 1CH 24TQFN EP - Rail/Tube |
| MAX3656ETG+T | 功能描述:激光驱动器 .155-2.5Gbps Burst Mode 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 |
| MAX3656ETG+TD | 制造商:Maxim Integrated Products 功能描述:LASER DRVR 2.5GBPS 1CH 24TQFN EP - Tape and Reel |
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