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| 型号： | MAX3946ETG+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 12/29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
Detailed Description
The MAX3946 SFP+ laser driver is designed to drive
5 I to 50 I TOSAs from 1Gbps to 11.3Gbps. The device
contains an input buffer with programmable equaliza-
tion, pulse-width adjustment, bias current and modula-
tion current DACs, output driver with programmable
deemphasis, power-on reset circuitry, bias monitor, laser
current limiter, and eye-safety circuitry. A 3-wire digital
interface is used to control the transmitter functions.
The registers that control the device’s functionality are
TXCTRL, SET_IMOD, SET_IBIAS, IMODMAX, IBIASMAX,
MODINC, BIASINC, SET_TXEQ, SET_PWCTRL, and
SET_TXDE.
Input Buffer with Programmable
Equalization
The input is internally biased and terminated with 50 I to
a common-mode voltage. The first amplifier stage fea-
tures a programmable equalizer for high-frequency loss-
es including SFP connector. Equalization is controlled
by the SET_TXEQ register and TXEQ_EN bit, TXCTRL[3]
(Table 1). The TX_POL bit in the TXCTRL register con-
trols the polarity of TOUT+ and TOUT- vs. TIN+ and TIN-.
The SET_PWCTRL register controls the output eye cross-
ing (Table 5). A status indicator bit (TXED) monitors the
presence of an AC input signal.
Bias Current DAC
The device’s bias current is optimized to provide up
to 80mA of bias current into a 5 I to 50 I laser load
with 200 F A resolution. The bias current is controlled
through the 3-wire digital interface using the SET_IBIAS,
IBIASMAX, and BIASINC registers.
For laser operation, the laser bias current can be set
using the 9-bit SET_IBIAS DAC. The upper 8 bits are set
by the SET_IBIAS[8:1] register, commonly used during
the initialization procedure after POR. The LSB (bit 0)
of SET_IBIAS is initialized to zero after POR and can
be updated using the BIASINC register. The IBIASMAX
register should be programmed to a desired maximum
bias current value (up to 96mA) to protect the laser. The
IBIASMAX register limits the maximum SET_IBIAS[8:1]
DAC code.
After initialization the value of the SET_IBIAS DAC reg-
ister should be updated using the BIASINC register
to optimize cycle time and enhance laser safety. The
BIASINC 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_IBIAS[8:1] exceeds
IBIASMAX[7:0], the IBIASERR warning flag is set and
SET_IBIAS[8:0] remains unchanged.
Modulation Current DAC
The modulation current from the device is optimized to
provide up to 80mA of modulation current into a 5 I to
25 I differential laser load (60mA for 50 I laser load)
with 300 F A to 200 F A resolution. The modulation current
is controlled through the 3-wire digital interface using
the SET_IMOD, IMODMAX, MODINC, and SET_TXDE
registers.
For laser operation, the laser modulation current can be
set using the 9-bit SET_IMOD DAC. The upper 8 bits
are set by the SET_IMOD[8:1] register, commonly used
during the initialization procedure after POR. The LSB (bit 0)
of SET_IMOD is initialized to zero after POR and can
be updated using the MODINC register. The IMODMAX
register should be programmed to a desired maximum
modulation current value (up to 96mA) to protect the
laser. The IMODMAX register limits the maximum
SET_IMOD[8:1] DAC code.
Table 1. Input Equalization Control Register Settings
TXCTRL[3]
TXEQ_EN
SET_TXEQ[2:1]
DESCRIPTION
0
1
1
1
1
X
0
0
1
1
X
0
1
0
1
150mV P-P to 1000mV P-P differential input amplitude (default setting)
Optimized for 1in to 4in FR4, 190mV P-P to 450mV P-P differential launch amplitude from source
Optimized for 4in to 6in FR4, 190mV P-P to 450mV P-P differential launch amplitude from source
Optimized for 1in to 4in FR4, 450mV P-P to 700mV P-P differential launch amplitude from source
Optimized for 4in to 6in FR4, 450mV P-P to 700mV P-P differential launch amplitude from source
12
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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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