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參數(shù)資料
| 型號： | MAX3967ETG |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 其它接口 |
| 英文描述： | 270Mbps SFP LED Driver |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, QCC24 |
| 封裝： | 4 X 4 MM, 0.80 MM HEIGHT, QFN-24 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 319K |
| 代理商： | MAX3967ETG |
Modulation-Current Generator
The modulation-current generator circuit provides con-
trol of the modulation-current amplitude. This amplitude
is determined by the voltage at the MODSET pin and
external resistor R
MODSET.
Do not connect bypass capacitors at the MODSET pin.
Capacitance at this pin increases high-frequency out-
put noise. The MON pin provides an optional modula-
tion-current monitor. The current sourced from the MON
pin is 1/96 of the modulation current. If used, the pin
should be connected to V
EE
through a resistor. The
resistance must be chosen so the voltage on MON
does not exceed 1.1V. If not used, leave MON open.
Prebias Current Generator
A prebias voltage (V
PREBIAS
) can be applied to the
LED to improve switching speed. The prebias current
generator creates a current that flows through the 78
prebias resistor in the output stage, creating a prebias
voltage. The prebias voltage can be adjusted by selec-
tively connecting pins PB1, PB2, and PB3 to V
EE
. Table 1
describes the functions of PB1, PB2, and PB3.
Output Current Drivers
The modulation-current reference is switched and
amplified by the output stages.
LED package lead inductance causes ringing and
overshoot, which can be compensated with an RC filter
network. The MAX3967 includes 35
and 12pF of inter-
M
270Mbps S FP LED Driver
_______________________________________________________________________________________
7
Figure 2. Functional Diagram
12pF
MODULATION-
CURRENT
GENERATOR
REFERENCE-VOLTAGE GENERATOR
PREBIAS-CURRENT
GENERATOR
COMPLEMENTARY
OUTPUT
24X
MAIN
OUTPUT
24X
V
TEMP
TCMIN
PB1
PB2
PB3
TCNOM
TC
MODSET
MON
1.2V
OUT-
OUT+
IN-
IN+
INPUT
BUFFER
GAIN 4X
MAX3967
RMODSET
VCCOUT
TX_DISABLE
50
35
5
V
CC
RPREBIAS
78
1
0
0
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| MAX3967ETG+ | 制造商:Maxim Integrated Products 功能描述:LED DRVR 2.97V TO 5.5V 24TQFN - Bulk |
| MAX3967ETG+T | 制造商:Maxim Integrated Products 功能描述:LED DRVR 2.97V TO 5.5V 24TQFN - Tape and Reel |
| MAX3967ETG-T | 制造商:Maxim Integrated Products 功能描述:270MBPS SFP LED DRIVER - Tape and Reel |
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