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參數(shù)資料
| 型號： | MAX3967E |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | LED驅(qū)動(dòng)器 |
| 英文描述： | 270Mbps SFP LED Driver |
| 中文描述： | 270Mbps的SFP LED驅(qū)動(dòng)器 |
| 文件頁數(shù)： | 6/14頁 |
| 文件大?。?/td> | 319K |
| 代理商： | MAX3967E |
M
Detailed Desc ription
The MAX3967 provides a flexible current drive for the
modulation of fiber optic light-emitting diodes (LEDs).
The circuit is designed to be used with +3.3V or +5V
power supplies. The IC provides up to 100mA of modu-
lation current. An adjustable prebias current source
sets the LED prebias voltage. An integrated resistor
provides passive peaking and optical pulse-width com-
pensation.
Figure 2 shows a block diagram of the MAX3967, which
comprises a reference-voltage generator, modulation-
current generator, input buffer with disable, prebias-
current generator, main output driver, complementary
output driver, and LED-compensation network.
T emperature Compensation
The reference-voltage generator circuit provides two
voltage sources that create modulation-current temper-
ature compensation. A positive modulation-current tem-
perature coefficient (tempco) is useful to compensate
for the temperature characteristics of typical fiber optic
LEDs. The first source has a temperature-stable output.
The second source has a temperature-increasing out-
put with a tempco of approximately 12,000ppm/°C (rel-
ative to +25°C). A resistor-divider between the two
reference generators programs the modulation-current
tempco. For maximum modulation-current tempco,
leave the TC pin disconnected. For a tempco of
approximately 3600ppm/°C, connect TC to TCNOM. To
obtain the minimum tempco, connect TCMIN to TC.
Intermediate tempco values can be programmed by
connecting an external resistor (R
TC
) between TCMIN
and TC.
Input Buffer
The inputs are connected to the PECL-compatible dif-
ferential input buffer. If left unconnected, IN+ is internal-
ly pulled to a PECL low and IN- is pulled to a PECL
high, causing low current at OUT+. The input imped-
ance of IN+ and IN- is approximately 50k
.
270Mbps S FP LED Driver
6
_______________________________________________________________________________________
PIN
NAME
FUNCTION
1
TCNOM
Shorting TC to TCNOM provides a modulation tempco of approximately 3600 ppm/°C.
2
TC
A resistor (R
TC
) connected between the TC and TCMIN pins sets the tempco of the modulation
current. Leaving R
TC
unconnected provides the maximum tempco.
3, 4, 5
PB1, PB2, PB3
Programs the Prebias Voltage at the OUT+ Pin (Table 1)
6, 7
V
EEOUT
Ground for the Output-Current Drivers
8, 9
OUT+
Current Output Pins
10, 11
OUT-
Complementary Current Output Pins
12, 16
N.C.
Not Connected
13, 14
V
CCOUT
Supply Connection for the Output-Current Drivers
15, 19
V
CC
Provides Current to the Internal Amplifiers
17
MON
The Current Sourced from the MON Pin is Proportional to the Modulator Current
18
MODSET
A Resistor from MODSET to V
EE
Programs the LED Modulation Current
20
IN-
Inverting Data Input
21
IN+
Noninverting Data Input
22
TX_DISABLE
Transmit Disable. When high, the current at the OUT+ pins is in the low state. The transmitter is
enabled when TX_DISABLE is open.
23
V
EE
Ground for internal amplifiers.
24
TCMIN
Shorting TC to TCMIN provides the minimum modulation-current tempco.
Pin Desc ription
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| MAX3967E/D DIE | 制造商:Maxim Integrated Products 功能描述: |
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