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参数资料
| 型号： | MAX3946ETG+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 13/29页 |
| 文件大小： | 0K |
| 描述： | IC LASER DVR SFP 11.3GBPS 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 |
| 数据速率： | 11.3Gbps |
| 通道数： | 1 |
| 电源电压： | 2.85 V ~ 3.63 V |
| 电流 - 电源： | 68mA |
| 电流 - 调制： | 80mA |
| 电流 - 偏置： | 80mA |
| 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： | 托盘 |
| 安装类型： | 表面贴装 |
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1Gbps to 11.3Gbps, SFP+ Laser Driver
with Laser Impedance Mismatch Tolerance
V CC
BIAS
MAX3946
0.6V
+
-
I BIAS
100
IF BMAX AND
WARNING
BMON
OR
IF BMAX IS
NOT USED
OR
IF BMON IS
NOT USED
OR
BMON ARE
NOT USED
100k I
R1
R1
1k I
BMAX
FAULT
1.2V
R2
1k I
R2
Figure 3. BMON and BMAX Circuitry
After initialization the value of the SET_IMOD DAC reg-
ister should be updated using the MODINC register
to optimize cycle time and enhance laser safety. The
MODINC register is an 8-bit register where the first 5 bits
contain the increment information in two’s comple-
ment notation. Increment values range from -16 to +15
LSBs. If the updated value of SET_IMOD[8:1] exceeds
IMODMAX[7:0], the IMODERR warning flag is set and
SET_IMOD[8:0] remains unchanged.
Modulation current sent to the laser is actually the com-
bination of the current generated by the SET_IMOD reg-
ister and current subtracted from this by the SET_TXDE
register.
Output Driver
The output driver is optimized for a 5 I to 50 I differen-
tial load. The output stage also features programmable
deemphasis that can be set as a percentage of the mod-
ulation current. The deemphasis function is controlled by
the TXDE_MD[1] and TXDE_MD[0] bits (TXCTRL[5:4])
and SET_TXDE[5:0].
Power-On Reset (POR)
POR ensures that the laser is off until supply voltage has
reached a specified threshold (2.75V). After POR, bias
current and modulation current ramps are controlled to
avoid overshoot. In the case of a POR, all registers are
reset to their default values.
BMON and BMAX Functions
Current out of the BMON pin is typically 1/100th the
value of the current at the BIAS pin. The total resistance
to ground at BMON sets the voltage gain. An internal
comparator at the BMAX pin latches a fault if the voltage
on BMAX exceeds the value of 1.2V. The BMAX voltage-
sense pin is connected by means of a voltage-divider to
the BMON pin and ground. The full-scale range of the
BMON voltage is 1.2V x (R1/R2 + 1) (Figure 3). The ana-
log bias-current limit is determined by (1.2V/R2) x 100.
Eye Safety and Output Control Circuitry
The safety and output control circuitry includes the dis-
able pin (DISABLE) and disable bit (TX_EN), along with a
fault indicator and fault detectors (Figure 4). The device
has two types of faults, HARD FAULT and SOFT FAULT.
A HARD FAULT triggers the FAULT pin, and the output
to the laser is disabled. A SOFT FAULT operates as a
warning, and the outputs are not disabled. Both types of
faults are stored in the TXSTAT1 and TXSTAT2 registers.
The FAULT pin is a latched output that can be cleared
by toggling the DISABLE pin. Toggling the DISABLE pin
also clears the TXSTAT1 and TXSTAT2 registers. A sin-
gle-point fault can be a short to V CC or ground. Table 2
shows the circuit response to various single-point faults.
______________________________________________________________________________________
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX3946ETG+ | 功能描述:激光驱动器 1.0625-11.3Gbps SFP Dual-Path Limit Amp 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 |
| MAX3946ETG+T | 功能描述:激光驱动器 1.0625-11.3Gbps SFP Dual-Path Limit Amp 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 |
| MAX3946EVKIT+ | 功能描述:激光驱动器 1.0625Gbps to 11.3Gbps SFP+ Laser Driver with Laser Impedance Mismatch Tolerance 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 |
| MAX3948ETE+ | 制造商:Maxim Integrated Products 功能描述:10G QSFP+ LDD - Rail/Tube |
| MAX3948ETE+T | 制造商:Maxim Integrated Products 功能描述:10G QSFP+ LDD 制造商:Maxim Integrated Products 功能描述:10G QSFP+ LDD - Tape and Reel |
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