MICREL SY100EL1001 Datasheet
LASER DIODE DRIVER
C
K
WITH INPUT D FLIP-FLOP
PRELIMINARY
SY100EL1001
FEATURES
■ Up to 1.25Gb/s operation
■ 75mA peak drive current
■ Separate modulation control
■ Separate master reset for laser safety
■ Differential inputs for data and clock
■ 75KΩ input pulldown resistor
■ Single power supply
■ Available in 16-pin SOIC package
PIN CONFIGURATION
16
V
15
NC
14
MC
13
OUT
12
OUT
11
V
R
V
N
CL
CLK
SET
CCO
1
2
3
4
Top View
5
6
D
SOIC
Z16-2
CC
BB
DESCRIPTION
The SY100EL1001 is a high speed current source for
driving a semiconductor laser diode in optical transmission
applications. The output current modulation is DC –
voltage controlled. The integrated circuit contains the
following functional blocks:
• Input Line Receiver
• D Flip-Flop
• Bias Control Circuitry
• Output Current Switch
A logic HIGH level at the data input results in the
modulation current flowing through the OUT pin on the
next rising edge of the clock. A logic HIGH level at the
master reset input will disable the modulation current.
The device incorporates complementary open collector
outputs with a capability of driving peak current of 75
mA.
The laser driver current is adjustable by selection of
RSET. The resistor REXT must be placed between OUT
and VCC to dissipate the worst case power. RSER is
recommended to fix laser diode matching issues.
The SY100EL1001 utilizes the high performance
bipolar ASSET technology.
7
D
8
MR
BLOCK DIAGRAM
CLK, CLK
D, D
MR
10
9
NC
EE
V
BB
V
D Flip-Flop
BIAS
Control
MC
Modulation Control
V
R
OUT
CC
EXT
OUT
R
SER
to Laser Diode
R
SET
V
EE
Rev.: E Amendment: /0
1
Issue Date: August, 1998
Micrel
PRELIMINARY
SY100EL1001
PIN NAMES TRUTH TABLE
Pin Function
V
CC, VCCO Most positive power supply pins separation helps
to isolate sensitive circuitry from noise
generating function. +5V for PECL operation
or ground for ECL operation.
V
EE Most negative power supply input. Ground
for PECL operation or -5V for ECL operation.
BB This pin provides a reference voltage for use
V
in single ended applications or when the
input signal is AC coupled into the device.
D,D These differential ECL/PECL 100K
compatible inputs receive NRZ data.
CLK, CLK These differential clock inputs
MR This ECL/PECL 100K compatible input resets
the Laser Driver Logic - modulation current
transitions to zero when asserted high.
OUT, OUT Open collector outputs from the modulation
buffer drive these differential current outputs.
MC An external voltage sets the main value of
modulation current IO.
SET An external resistor sets the source current
R
for modulation Imod.
NC These pins are not connected.
D D CLK CLK MR OUT OUT
LHZZZL HL
HLZZZL LH
XXXX H HL
NOTE:
1. L = LOW, H = HIGH, Z = LOW-to-HIGH transition,
ZZ = HIGH-to-LOW transition, X = don't care.
(1)
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol Rating Value Unit
VCC Power Supply Voltage (VCC = 0V) 0 to -7.0 V
VIN Input Voltage (VCC = 0V) 0 to -6.0 V
IO Output Current 75 mA
TA Operating Temperature Range -40 to +85 ˚C
tot Power Dissipation 500 mW
P
NOTE:
1. Permanent device damage may occur if ABSOLUTE MAXIMUM RATINGS are exceeded. This is a stress rating only and functional operation is not implied
at conditions other than those detailed in the operational sections of this data sheet. Exposure to ABSOLUTE MAXIMUM RATlNG conditions for extended
periods may affect device reliability.
OPERATIONING CONDITIONS
(1)
Symbol Rating Value Unit
VEE Power Supply Voltage -4.75 to -5.25 V
RSET Resistor to Adjust Current 10 to 100 Ω
REXT Resistor to Dissipate Power 10 to 50 Ω
R
SER Laser Diode Serial Resistor 0 to 50 Ω
NOTE:
1. The voltage drop across REXT and RSER should not be greater than 2V.
2
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