- 您现在的位置：买卖IC网 > PDF目录20055 > MAX3946ETG+ (Maxim Integrated)IC LASER DVR SFP 11.3GBPS 24TQFN PDF资料下载
参数资料
| 型号： | MAX3946ETG+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 21/29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 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页当前第21页第22页第23页第24页第25页第26页第27页第28页第29页
1Gbps to 11.3Gbps, SFP+ Laser Driver
with Laser Impedance Mismatch Tolerance
? ? ? 0.15mA ( SET_IMOD [ 8 : 4 ] + 1 ) ? ? 50 ? + R LD
? ? ? 0.15mA ( SET_TXDE [ 5:0 ] + 1 ) ? ? 50 ? + R LD
I MOD = 0.9 × ? ? 0.3mA ( SET_IMOD [ 8 : 0 ] + 16 ) ? ? ×
Design Procedure
Programming Bias Current
1) IBIASMAX[7:0] = Maximum_Bias_Current_Value
2) SET_IBIAS i [8:1] = Initial_Bias_Current_Value
Note: The total bias current is calculated using the
SET_IBIAS[8:0] DAC value. SET_IBIAS[8:1] are the bits
that can be manually written. SET_IBIAS[0] can only be
updated using the BIASINC register.
When implementing an APC loop it is recommended to
use the BIASINC register, which guarantees the fastest
bias current update.
3) BIASINC i [4:0] = New_Increment_Value
4) If (SET_IBIAS i [8:1] P IBIASMAX[7:0]), then (SET_
IBIAS i [8:0] = SET_IBIAS i-1 [8:0] + BIASINC i [4:0])
5) Else (SET_IBIAS i [8:0] = SET_IBIAS i - 1 [8:0])
The total bias current can be calculated as follows:
6) I BIAS = [SET_IBIAS i [8:0] + 16] x 200 F A
Programming Modulation Current
1) IMODMAX[7:0] = Maximum_Modulation_Current_Value
2) SET_IMOD i [8:1] = Initial_Modulation_Current_Value x 1.06
Note: The total modulation laser current is calculated
using the SET_IMOD[8:0] DAC value and the SET_TXDE
register value. SET_IMOD[8:1] are the bits that can be
manually written. SET_IMOD[0] can only be updated
using the MODINC register.
When implementing modulation compensation, it is rec-
ommended to use the MODINC register, which guaran-
tees the fastest modulation current update.
3) MODINC i [4:0] = New_Increment_Value
4) If (SET_IMOD i [8:1] P IMODMAX[7:0]), then (SET_
IMOD i [8:0] = SET_IMOD i - 1 [8:0] + MODINCi[4:0])
5) Else (SET_IMOD i [8:0] = SET_IMOD i - 1 [8:0])
The following equations give the modulation current
(peak-to-peak) seen at the laser when driven differen-
tially. R EXTD is the differential load impedance of the
laser plus any added series resistance.
6a) TXDE_MD[1:0] = 00, then
6b) TXDE_MD[1:0] = 01, then
? 0.3mA ( SET_IMOD [ 8 : 0 ] + 16 ) ? 50 ?
I MOD = ? ? ×
6c) TXDE_MD[1:0] = 10, then set SET_TXDE[5:0] can be
set to any value ≥ SET_IMOD[8:4] and
? 0.3mA ( SET_IMOD [ 8 : 0 ] + 16 ) ? 50 ?
I MOD = ? ? ×
When SET_TXDE[5:0] is increased, the deemphasis
current increases and the overall peak-to-peak modu-
lation current decreases. This effect saturates when
SET_TXDE[5:0] = 0.2 x (SET_IMOD[8:0] + 16) - 1, and
further increases to SET_TXDE[5:0] do not increase the
deemphasis current.
6d) TXDE_MD[1:0] = 11, then
50 ?
50 ? + R LD
Note: When TXDE_MD[1:0] = 10 and the SET_TXDE
register is set by the user, the minimum allowed deem-
phasis is 3% and the maximum is 10%. These limits are
internally set by the MAX3946.
Programming Transmit Output Deemphasis
1) TXDE_MD[1:0] = Transmit_Deemphasis_Mode
2) SET_TXDE[5:0] = Transmit_Deemphasis_Value. If
TXDE_MD[1:0] = 00, 01, or 11, the value of SET_TXDE
is automatically set by the device and there is no
need to enter data to SET_TXDE.
For Transmit_Deemphasis_Mode:
00 = deemphasis is fixed at 6% of the modulation ampli-
tude (the device controls the SET_TXDE value), default
setting
01 = deemphasis is fixed at 3% of the modulation ampli-
tude (the device controls the SET_TXDE value)
10 = deemphasis is programmed by the SET_TXDE
register setting
? ? ? 0.15mA ( SET_IMOD [ 8 : 3 ] + 2 ) ? ?
? 0.3mA ( SET_IMOD [ 8 : 0 ] + 16 ) ?
I MOD = ? ? ×
50 ?
50 ? + R LD
11 = deemphasis is at its maximum of approximately 9%
(the device controls the SET_TXDE value)
______________________________________________________________________________________
21
相关PDF资料 |
PDF描述 |
|---|---|
| MAX3296CTI+ | IC LASR DRVR 2.5GBPS 5.5V 28TQFN |
| CENB1050A1803F01 | POWER SUPP EXT 50.4W 18V @ 2.8A |
| RBB10DHHN | CONN EDGE DUAL .050 DIP 20 POS |
| CENB1050A1503N01 | POWER SUPP EXT 50.4W 15V @ 3.36A |
| CENB1050A1503F01 | POWER SUPP EXT 50.4W 15V @ 3.36A |
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 |
发布紧急采购，3分钟左右您将得到回复。