i7110
© 2005 iCreate Technologies Corporation
Page 1
APD-8011-001
+3.3V to +5.0V, 300Mbps LED Driver
1
Introduction
1.1 General Description
The i7110 is a high-speed
LED driver
designed for low-cost optical fiber based
transmission systems. Data rates up to
300Mbps can be achieved depending on
the LED used.
The differential PECL inputs can be
shaped by applying resistors between
pulse width adjustment pins and ground.
This adjustment is continuous over a
±
500ps range to compensate the LED
unbalanced ‘turn on’ and ‘turn off’ time. A
peaking and clamp circuit is implemented
in i7110 to enhance speed performance
and connecting external RC network
performs this function.
The i7110 can switch a wide range of
current 5mA to 120mA into typical
LEDs.
To
minimize
the
effects
of
temperature on LED output power, the
device's modulation current can be set via
two external resistors to increase with a
temperature coefficient from 800ppm/℃ to
10000ppm/℃.
Complementary current outputs help to
maintain
a
constant
supply
current,
reducing EMI and supply noise generated
by the transmitter module, and the current
is disabled if pin Disa is Pulled high. The
i7110 is packaged in QSOP16 and
TSSOP20.
1.2 Applications
FDDI
SDH STM-1
SONET OC-3
Fast Ethernet
Fiber Channel
1.3 Features
Data
rates
up
to
300
Mbps,
depending on LED.
+5 V to +3.3 V operation.
Programmable output current from
5mA to 120mA.
Peaking circuit giving rise and fall
time < 700ps.
Clamping circuit enhances turn off
time.
Resistor
programmable
compensation
for
temperature
dependence of LED output.
PECL input with optional pulse width
adjustment.
Support most LED types.
Support output current disable ability.
Single Chip solution, available in
TSSOP20 or QSOP16.
1.4 Ordering Information
Part no.
Package
i7110-ES
16-pin QSOP
i7110-EG
16-pin QSOP
i7110-EP
20-pin TSSOP
* i7110-EG is provided in green package
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