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參數(shù)資料
| 型號(hào)： | MAX3668EHJ |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 其它接口 |
| 英文描述： | +3.3V, 622Mbps SDH/SONET Laser Driver with Automatic Power Control |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, PQFP32 |
| 封裝： | 5 X 5 MM, 1 MM HEIGHT, MS-026AAA-HD, TQFP-32 |
| 文件頁(yè)數(shù)： | 6/12頁(yè) |
| 文件大?。?/td> | 435K |
| 代理商： | MAX3668EHJ |
M
+3.3V, 622Mbps SDH/SONET
Laser Driver with Automatic Power Control
6
_______________________________________________________________________________________
MAX3668
DATA+
OUT+
OUT-
DATA-
100k
ENABLE
I
MD
R
APCSET
R
BIASMAX
R
MODSET
APCSET
CAPC
C
APC
BIASMAX
MD
MODSET
FAIL
BIAS
I
BIAS
165X
V
CC
FAILURE
DETECTOR
40X
5X
Figure 3. Functional Diagram
Detailed Description
The MAX3668 laser driver consists of two main parts: a
high-speed modulation driver and a laser-biasing block
with Automatic Power Control (APC). The circuit is opti-
mized for low-voltage (+3.3V) operation.
The output stage is composed of a high-speed differential
pair and a programmable modulation current source.
Since the modulation output drives a maximum current
of 75mA into the laser with a 230ps edge speed, large
transient voltage spikes can be generated due to the
parasitic inductance. These transients and the laser for-
ward voltage leave insufficient headroom for the proper
operation of the laser driver if the modulation output is
DC-coupled to the laser diode. To solve this problem,
the MAX3668’s modulation output is designed to be
AC-coupled to the cathode of a laser diode. A simpli-
fied functional diagram is shown in Figure 3.
The MAX3668 modulation output is optimized for driv-
ing a 20
10
load; the minimum required voltage at
OUT+ is 2.0V. Modulation current swings of 75mA are
possible. To interface with the laser diode, a damping
resistor (R
D
) is required for impedance matching. An
RC shunt network may be used to compensate for the
laser-diode parasitic inductance, thereby improving the
optical output aberrations and duty-cycle distortion.
At a 622Mbps data rate, any capacitive load at the cath-
ode of a laser diode degrades the optical output perfor-
mance. Since the BIAS output is directly connected to the
laser cathode, minimize the parasitic capacitance associ-
ated with this pin by using an inductor to isolate the BIAS
pin from the laser cathode.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3668EHJ+ | 功能描述:激光驅(qū)動(dòng)器 3.3V 622Mbps SDH/SONET RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube |
| MAX3668EHJ+T | 功能描述:激光驅(qū)動(dòng)器 3.3V 622Mbps SDH/SONET RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube |
| MAX3668EHJ-T | 功能描述:激光驅(qū)動(dòng)器 3.3V 622Mbps SDH/SONET RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube |
| MAX3668EVKIT | 功能描述:激光驅(qū)動(dòng)器 Evaluation Kit for the MAX3668 RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube |
| MAX3669E/D | 功能描述:激光驅(qū)動(dòng)器 DICE SALES DICE12 RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube |
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