参数资料
| 型号： | MAX3799ETJ+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 27/36页 |
| 文件大小： | 0K |
| 描述： | IC AMP LIMITING VCSEL DVR 32TQFN |
| 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： | 14Gbps |
| 通道数： | 1 |
| 电源电压： | 2.85 V ~ 3.63 V |
| 电流 - 电源： | 97mA |
| 电流 - 调制： | 12mA |
| 电流 - 偏置： | 15mA |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
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MAX3799
1Gbps to 14Gbps, SFP+ Multirate Limiting
Amplifier and VCSEL Driver
Transmitter Deemphasis Control Register (SET_TXDE)
Bit #
Name
Default Value
7
X
X
6
X
X
5
X
X
4
X
X
3
SET_TXDE
[3] (MSB)
0
2
SET_TXDE
[2]
0
1
SET_TXDE
[1]
0
0
SET_TXDE
[0] (LSB)
0
ADDRESS
H0x10
Bits 3 to 0: SET_TXDE[3:0]. This is a 4-bit register used to control the amount of deemphasis on the transmitter out-
put. When calculating the total modulation current, the amount of deemphasis must be taken into account. The
deemphasis is set as a percentage of modulation current.
Design Procedure
6)
I MOD(Rextd=100 ? ) = [(20 + SET_IMOD i [8:0]) x 40μA]
× ? 1 ?
?
?
?
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 value is calculated using
the SET_IBIAS[8:0] register. SET_IBIAS[8:1] are the bits
that can be manually written. SET_IBIAS[0] can only be
updated using the BIASINC[4:0] register.
? 2 + SET _ TXDE[3 : 0] ?
64
For general Rextd, the modulation current that is
achieved using the same setting of SET_IMOD i [8:0] as
for Rextd = 100 ? is shown below. It can be written as a
function of I MOD(Rextd=100 ? ) , still assuming a 100 ? on-
chip load.
7) I MOD (Re xtd ) = 2 × I MOD (Re xtd = 100 ? ) ?
When implementing an APC loop, it is recommended to
use the BIASINC[4:0] register, which guarantees the
fastest bias current update.
?
?
Re xt ?
Re xt + 100 ? ?
3) BIASINC i [4:0] = New_Increment_Value
4) If (SET_IBIAS i [8:1] ≤ 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] + 20] x 40μA
Programming Modulation Current
1) IMODMAX[7:0] = Maximum_Modulation_Current_Value
Programming LOS Threshold
LOS TH = (SET_LOS[5:0] x 1.5mV P-P )
Programming Transmit Output
Deemphasis
The TXDE_EN bit must be set to 1 to enable the deem-
phasis function. The SET_TXDE register value is used
to set the amount of deemphasis, which is a percent-
age of the modulation current. Deemphasis percentage
is determined as:
2) SET_IMOD i [8:1] = Initial_Modulation_Current_Value
Note: The total modulation current value is calculated
using the SET_IMOD[8:0] register. SET_IMOD[8:1] are
DE (%) =
100 × ( 2 + SET _ TXDE[3 : 0] )
64
the bits that can be manually written. SET_IMOD[0] can
only be updated using the MODINC[4:0] register.
When implementing modulation compensation, it is rec-
ommended to use the MODINC[4:0] register, which
guarantees the fastest modulation current update.
3) MODINC i [4:0] = New_Increment_Value
4) If (SET_IMOD i [8:1] ≤ IMODMAX[7:0]),
then (SET_IMOD i [8:0] = SET_IMOD i-1 [8:0] + MODINC i [4:0])
5) Else (SET_IMOD i [8:0] = SET_IMOD i-1 [8:0])
The following equation is valid with assumption of 100 ?
on-chip and 100 ? external differential load (Rextd). The
maximum value that can be set for SET_TXDE[3:0] = 11.
Maxim Integrated
where the maximum SET_TXDE[3:0] = 11.
For an I MOD value of 10mA, the maximum achievable
deemphasis value is approximately 20%. Maximum
deemphasis achievable for full I MOD range of 12mA is
limited to 15%.
With deemphasis enabled, the value of the modulation
current amplitude is reduced by the calculated deem-
phasis percentage. To maintain the modulation current
amplitude constant, the SET_IMOD[8:0] register must
be increased by the deemphasis percentage. If the sys-
tem conditions like temperature, required I MOD value,
etc., change during the transmit operation, the deem-
phasis setting might need to be readjusted. For such an
27
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX3799EVKIT+ | 功能描述:限幅放大器 Maxim Evaluation Kit RoHS:否 制造商:Micrel 输入电压范围（最大值）:3.6 V 工作电源电压:3.3 V 电源电流:40 mA 工作温度范围:- 40 C to + 85 C 封装 / 箱体:MSOP-10 封装:Tube |
| MAX379C/D | 功能描述:多路器开关 IC RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| MAX379CJE | 功能描述:多路器开关 IC RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| MAX379CPE | 功能描述:多路器开关 IC RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| MAX379CPE+ | 功能描述:多路器开关 IC 4:1 2Ch Fault-Prtct Analog MUX RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
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