MC10SX1130 Datasheet, PDF (1/8 Pages) ON Semiconductor – LED DRIVER

MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
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by MC10SX1130/D
LED Driver
The MC10SX1130 is high speed LED Driver/current switch specifically
targeted for use in FDDI PMD and ANSI X3T9.3 FibreChannel 266
Mbits/s optical transmitters. The integrated circuit contains several
unique functional blocks which makes it easily configurable for use with a
variety of high performance LED devices. The part is fabricated using
Motorola’s proven MOSAIC III™ advanced bipolar process. The logic is
designed so that a data HIGH input results in the modulation current
flowing through the IOUT pin to turn on the LED.
• Differential Data Inputs
MC10SX1130
LED DRIVER
• 300MHz Operation
• 100mA Peak Drive Current
• Extremely Low Jitter
• Duty Cycle Distortion Compensation
• Adjustable Output Current Tracking With Temperature
• Thermally Enhanced 16-Lead SOIC Package
• 75kΩ Data Input Pulldown Resistors
• +5V or –5.2V Operation
16
1
• VBB Reference Available
D SUFFIX
SOIC PACKAGE
CASE 751B-05
The device incorporates open collector outputs with a capability of
driving peak currents of 100mA. Since the output current switching
circuitry simply switches current between the complementary outputs, the
dynamic switching demands on the system power supply are greatly reduced. In addition, because the design is pure bipolar, the
device current drain is insensitive to the data pattern and frequency of operation.
The LED drive current is adjustable through the selection of an external set resistor, RSET. In addition, to allow for open loop
compensation for the LED’s negative optical output power tracking over temperature, a circuit is included to provide an
adjustable positive temperature tracking coefficient to the LED drive current. This is controlled through the selection of an
external resistor, RTCO.
The MC10SX1130 incorporates novel pulse stretching circuitry which is intended to compensate for the turn-on delay and rise
and fall time asymmetry inherent in LED devices. The stretch circuitry can be used to pre-distort the input signal pulse width to
minimize the duty cycle distortion of the transmitted optical eye pattern. The stretch circuitry supports three different selections of
pre-distortion. This choice is accomplished through a unique ‘tri-state’ input which can be left open, tied to VCC, or tied to VEE to
determine the pre-distortion amount.
The device provides a VBB output for either single-ended use or as a DC bias for AC coupling the signal into the device. The
VBB pin should only be used as a bias for the MC10SX1130 as its current sink/source capability is limited. Whenever used, the
VBB pin should be bypassed to ground via a 0.01µF capacitor.
Pinout: 16-Lead Plastic Package (Top View)
VEE Stretch VEE IOUT RSET IOUT VCC VEE
16 15 14 13 12 11 10 9
BLOCK DIAGRAM
ECL
BUFFER
DIN
DIN
Stretch
PULSE WIDTH
ADJUST CIRCUIT
IOUT IOUT
VBB
12345678
VEE VCC VBB DIN DIN RTCO1 RTCO2 VEE
MOSAIC III is a trademark of Motorola.
3/94
© Motorola, Inc. 1994
BIAS
CONTROL
RTCO1
RTCO2
REV 1
RSET