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MAX3967D Datasheet(PDF) 6 Page - Maxim Integrated Products

Part # MAX3967D
Description  270Mbps SFP LED Driver
Download  14 Pages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX3967D Datasheet(HTML) 6 Page - Maxim Integrated Products

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Detailed Description
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.
Temperature 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 (RTC) 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
Ω.
270Mbps SFP LED Driver
6
_______________________________________________________________________________________
PIN
NAME
FUNCTION
1
TCNOM
Shorting TC to TCNOM provides a modulation tempco of approximately 3600 ppm/°C.
2TC
A resistor (RTC) connected between the TC and TCMIN pins sets the tempco of the modulation
current. Leaving RTC unconnected provides the maximum tempco.
3, 4, 5
PB1, PB2, PB3
Programs the Prebias Voltage at the OUT+ Pin (Table 1)
6, 7
VEEOUT
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
VCCOUT
Supply Connection for the Output-Current Drivers
15, 19
VCC
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 VEE 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
VEE
Ground for internal amplifiers.
24
TCMIN
Shorting TC to TCMIN provides the minimum modulation-current tempco.
Pin Description


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