®
EL6203
Data Sheet
November 15, 2002
FN7218
Laser Driver Oscillator
The EL6203 is a push-pull oscillator
used to reduce laser noise. It uses the
standard interface to existing ROM
controllers. The frequency and amplitude are each set with a
separate resistor connected to ground. The tiny package and
harmonic reduction allow the part to be placed close to a
laser with low RF emissions. An auto turn-off feature allows it
to easily be used on combo CD-RW plus DVD-ROM pick-
ups.
One external resistor sets the oscillator frequency. Another
external resistor sets the oscillator amplitude. If the APC
current is reduced such that the average laser voltage drops
to less than 1.1V, the output and oscillator are disabled,
reducing power consumption to a minimum.
The current drawn by the oscillator consists of a small bias
current, plus the peak output amplitude in the positive cycle.
In the negative cycle the oscillator subtracts peak output
amplitude from the laser APC current.
This part is pin-compatible to the EL6201. It is superior to the
EL6201 in several ways: It has up to 100mA output
capability, it is more power-efficient, it has less harmonic
content, and it has an auto shut-off feature activated at 1.1V.
The part is available in the space-saving 5-pin SOT-23
package. It is specified for operation from 0°C to +70°C.
Features
• Low power dissipation
• User-selectable frequency from 60MHz to 600MHz
controlled with a single resistor
• User-specified amplitude from 10mA
PK-PK
to 100mA
PK
controlled with a single resistor
• Auto turn-off threshold
• Soft edges for reduced EMI
• Small 5-pin SOT-23 package
Applications
• DVD players
• DVD-ROM drives
• CD-RW drives
• MO drives
• General purpose laser noise reduction
Ordering Information
PART NUMBER
EL6203CW
EL6203CW-T7
EL6203CW-T13
PACKAGE
5-Pin SOT-23*
5-Pin SOT-23*
5-Pin SOT-23*
TAPE & REEL
-
7”
13”
PKG. NO.
MDP0038
MDP0038
MDP0038
Pinout
EL6203
(5-PIN SOT-23)
TOP VIEW
1
VDD
RFREQ
5
*EL6203CW symbol is .Zxxx where xxx represents date code
2
GND
3
IOUT
RAMP
4
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright © Intersil Americas Inc. 2003. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc.
All other trademarks mentioned are the property of their respective owners.
EL6203
Absolute Maximum Ratings
(T
A
= 25°C)
Voltages Applied to:
V
DD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +6.0V
I
OUT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +6.0V
R
FREQ
, R
AMP
. . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +6.0V
Operating Ambient Temperature Range . . . . . . . . . . . 0°C to +70°C
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . +150°C
Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C
Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100mA
PK-PK
Power Dissipation (max) . . . . . . . . . . . . . . . . . . . . . . . . See Curves
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise noted, all tests
are at the specified temperature and are pulsed tests, therefore: T
J
= T
C
= T
A
Supply & Reference Voltage Characteristics
V
DD
= +5V, T
A
= 25°C, R
L
= 10Ω, R
FREQ
= 5210Ω (F
OSC
= 350MHz), R
AMP
=
2540Ω (I
OUT
= 50mA
P-P
measured at 60MHz), V
OUT
= 2.2V
PARAMETER
PSOR
I
SO
I
STYP
I
SLO
I
SHI
V
FREQ
V
RAMP
V
CUTOFF
DESCRIPTION
Power Supply Operating Range
Supply Current Disabled
Supply Current Typical Conditions
Supply Current Low Conditions
Supply Current High Conditions
Voltage at R
FREQ
Pin
Voltage on RAMP Pin
Monitoring Voltage of I
OUT
Pin
1.1
V
OUT
< V
CUTOFF
R
FREQ
= 5.21kΩ, R
AMP
= 2.54kΩ
R
FREQ
= 30.5kΩ, R
AMP
= 12.7kΩ
R
FREQ
= 3.05kΩ, R
AMP
= 1.27kΩ
CONDITIONS
MIN
4.5
550
18.5
4.75
32
1.27
1.27
1.4
TYP
MAX
5.5
750
22
UNIT
V
µA
mA
mA
mA
V
V
V
Oscillator Characteristics
V
DD
= +5V, T
A
= 25°C, R
L
= 10Ω, R
FREQ
= 5210Ω (F
OSC
= 350MHz), R
AMP
= 2540Ω (I
OUT
= 50mA
P-P
measured at 60MHz), V
OUT
= 2.2V
PARAMETER
F
OSC
F
HIGH
F
LOW
TC
OSC
PSRR
OSC
DESCRIPTION
Frequency Tolerance
Frequency Range High
Frequency Range Low
Frequency Temperature Sensitivity
Frequency Change
∆F/F
CONDITIONS
Unit-unit frequency variation
R
FREQ
= 3.05kΩ
R
FREQ
= 30.5kΩ
0°C to +70°C ambient
V
DD
from 4.5V to 5.5V
MIN
300
TYP
350
600
60
50
1
MAX
400
UNIT
MHz
MHz
MHz
ppm/°C
%
Driver Characteristics
PARAMETER
AMP
HIGH
AMP
LOW
IOS
NOM
IOS
HIGH
IOS
LOW
I
OUTP-P
Duty Cycle
PSRR
AMP
T
ON
T
OFF
IOUT
N
V
DD
= +5V, T
A
= 25°C, R
L
= 10Ω, R
FREQ
= 30.5kΩ (F
OSC
= 60MHz), R
AMP
= 2540Ω (I
OUT
= 50mA
P-P
measured at 60MHz), V
OUT
= 2.2V
CONDITIONS
R
AMP
= 1.27kΩ
R
AMP
= 12.7kΩ
R
FREQ
= 5210Ω, V
OUT
= 2.2V
R
FREQ
= 5210Ω, V
OUT
= 2.8V
R
FREQ
= 5210Ω, V
OUT
= 1.8V
Defined as one standard deviation
R
FREQ
= 5210Ω
V
DD
from 4.5V to 5.5V
Output voltage step from 0V to 2.2V
Output voltage step from 2.2V to 0V
R
FREQ
= 5210Ω, measured @ 10MHz
MIN
TYP
100
10
-4
-4.8
-3.5
2
43
-54
15
0.5
2.5
MAX
UNIT
mA
P-P
mA
P-P
mA
mA
mA
%
%
dB
µs
µs
nA/√Hz
DESCRIPTION
Amplitude Range High
Amplitude Range Low
Offset Current @ 2.2V
Offset Current @ 2.8V
Offset Current @ 1.8V
Output Current Tolerance
Output Push Time/Cycle Time
Amplitude Change of Output
∆I/I
Auto Turn-on Time
Auto Turn-off Time
Output Current Noise Density
2
EL6203
Pin Descriptions
PIN NAME
1
2
3
4
5
PIN TYPE
VDD
GND
IOUT
RAMP
RFREQ
PIN DESCRIPTION
Positive power for laser driver (4.5V - 5.5V)
Chip ground pin (0V)
Current output to laser diode
Set pin for output current amplitude
Set pin for oscillator frequency
Recommended Operating Conditions
V
DD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V ±10%
V
OUT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2V - 3V
R
FREQ
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3kΩ (min)
R
AMP
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.25kΩ (min)
F
OSC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60-600MHz
I
OUT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-100mA
PK-PK
I
OUT
Control
V
OUT
Less than V
CUTOFF
More than V
CUTOFF
I
OUT
OFF
Normal Operation
3
EL6203
Typical Performance Curves
V
DD
= 5V, T
A
= 25°C, R
L
= 10Ω, R
FREQ
= 5.21kΩ, R
AMP
= 2.54kΩ, V
OUT
= 2.2V unless otherwise specified.
Frequency Distribution
500
Typical
Production
Distortion
8
7
6
Number of Parts
Number of Parts
300
5
4
3
2
100
1
0
310
318
326
334
342
350
358
366
374
382
390
0
6
18
30
42
54
66
78
90
0.35
0.8
0.9
Measured from
-40°C to +85°C
Frequency Drift with Temperature
400
200
Frequency (MHz)
Frequency TC (ppm/°C)
Frequency vs R
FREQ
700
Frequency=1824 * 1kΩ / R
FREQ
(MHz)
600
500
Frequency (MHz)
400
300
200
100
0
0
5
10
15
20
25
30
35
Frequency (MHz)
600
500
400
300
200
100
0
700
Frequency vs 1 / R
FREQ
Frequency=1824 * 1kΩ / R
FREQ
(MHz)
0
0.05
0.1
0.15
0.2
0.25
0.3
R
FREQ
(kΩ)
1kΩ / R
FREQ
Output Current vs R
AMP
180
160
140
Output Current (mA)
120
100
80
(over-shoot not included)
60
40
20
0
0
2
4
6
8
10
12
14
Amplitude
PK-PK
=127 * 1kΩ / R
AMP
(mA)
measured @60MHz
I
OUT PK-PK
measured @60/350/600MHz
(over-shoot included)
Output Current (mA)
180
160
140
120
100
80
60
40
20
Output Current vs 1 / R
AMP
I
OUT PK-PK
measured @60/350/600MHz
(over-shoot included)
Amplitude
PK-PK
=
127 * 1kΩ / R
AMP
(mA)
measured @60MHz
(over-shoot not included)
0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
R
AMP
(kΩ)
1kΩ / R
AMP
4
EL6203
Typical Performance Curves
(Continued)
Supply Current vs R
FREQ
25
35
Supply Current vs R
AMP
30
Supply Current (mA)
Supply Current (mA)
20
25
20
15
15
10
0
0
5
10
15
20
25
30
35
0
0
5
10
15
20
25
30
35
R
FREQ
(kΩ)
R
AMP
(kΩ)
Frequency vs Supply Voltage
360
100
Peak-to-Peak Output Current vs Supply Voltage
355
Frequency (MHz)
I
OUT PK-PK
(mA)
4.6
4.8
5
5.2
5.4
5.6
95
350
90
345
85
340
4.4
80
4.4
4.6
4.8
5
5.2
5.4
5.6
Supply Voltage (V)
Supply Voltage (V)
Supply Current vs Supply Voltage
21
400
Frequency vs Temperature
380
20
Supply Current (mA)
Frequency (MHz)
4.6
4.8
5
5.2
5.4
5.6
360
19
340
18
320
17
4.4
300
-50
0
50
Ambient Temperature (°C)
100
150
Supply Voltage (V)
5
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