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參數(shù)資料
| 型號： | MAX3905 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 150Mbps Automotive VCSEL Driver |
| 中文描述： | 150Mbps汽車VCSEL驅(qū)動器 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大小： | 1168K |
| 代理商： | MAX3905 |
M
DT
0
≈
[36 + 13(DT01) + 25(DT02)]°C
where DT0[1, 2] = 1 when bonded to V
CC
; DT0[1, 2] = 0
when left open.
Modulation-Current Generator
The modulation-current generator provides wirebond-
selectable current amplitude with temperature compen-
sation. The temperature coefficient (TC
MOD
) compen-
sates for the slope-efficiency change of the VCSEL over
temperature. The modulation current is set with inputs
MOD1 and MOD2. Connect MOD1 or MOD2 to V
CC
to
set the bit high, and leave open to set the bit low.
The typical modulation current at +25°C can be calcu-
lated by:
I
MOD
≈
[3.01 + (0.64 x MOD1) + (1.27 x MOD2)]mA
where MOD[1, 2] = 1 when bonded to V
CC
; MOD
[1, 2] = 0 when left open.
Power Reduction
The power-reduction feature is useful for in-system test
and diagnostics. When the 3DB input is low, the modu-
lation current is reduced by 50%. When 3DB is high or
V
CC
, the modulation output is normal.
For compatibility with 5V POF transmitters, the power
mode can be set by connecting a resistor from 3DB to
V
CC
. A resistor R
GAIN
< R
GAINN
sets the normal power
mode, while R
GAIN
> R
GAINL
sets the low-power mode.
Bias-Current Generator
The bias-current generator provides a current that
closely tracks the VCSEL properties with temperature.
This current is summed with the modulation current at
the OUT pad. The bias current at T
J
= DT
0
is
150Mbps Automotive VCSEL Driver
8
_______________________________________________________________________________________
Table 1. Driver Current and Temperature
Coefficient Definitions
PARAMETER
DESCRIPTION
I
LOW
Total VCSEL current when the data input is
logic-low.
I
HIGH
Total VCSEL current when the data input is
logic-high.
I
MOD
I
HIGH
- I
LOW.
DT
0
The center of the temperature-stable low-
current region (T
W
). DT
0
roughly
corresponds to T
0
of the VCSEL.
I
DT0
I
LOW
at T
J
= DT
0
.
The size (in °C) of the region where no
temperature coefficient is applied to I
LOW
.
The temperature coefficient applied to I
MOD
.
T
W
TC
MOD
TC
LOW
The temperature coefficient applied to I
LOW
.
This coefficient is negative below DT
0
- T
W
/2
and positive above DT
0
+ T
W
/2.
Total VCSEL current while squelched.
I
OFF
O
V
JUNCTION TEMPERATURE
TIME
I
HIGH
I
LOW
I
HIGH
I
LOW
I
MOD
= I
HIGH
- I
LOW
TC
MOD
TC
LOW
+ TC
MOD
TC
LOW
DT
O
T
W
Figure 2. Driver Current and Temperature Coefficient Definitions
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3905E/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX3910U/D | 功能描述:跨阻抗放大器 RoHS:否 制造商:Texas Instruments 封裝 / 箱體:SOIC-14 帶寬:3 MHz 工作電源電壓:36 V 電源電流:5.5 mA 工作溫度范圍:- 40 C to + 85 C 封裝:Tube |
| MAX3911EGK | 制造商:Maxim Integrated Products 功能描述: |
| MAX3911EGKD | 制造商:Maxim Integrated Products 功能描述: |
| MAX391C/D | 功能描述:模擬開關(guān) IC RoHS:否 制造商:Texas Instruments 開關(guān)數(shù)量:2 開關(guān)配置:SPDT 開啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開啟時間（最大值）: 關(guān)閉時間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-16 |
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