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1
FN7219.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2004. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc.
All other trademarks mentioned are the property of their respective owners.
EL6204
Laser Driver Oscillator
The EL6204 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.
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 utility
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.
The EL6204 part is available in the space-saving 6-pin SOT-
23 package and is specified for operation from 0
C to +70
C.
Pinout
EL6204
(6-PIN SOT-23)
TOP VIEW
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-PK
controlled with a single resistor
Auto turn-off threshold
Soft edges for reduced EMI
Small 6-pin SOT-23 package
Applications
DVD players
DVD-ROM drives
CD-RW drives
MO drives
General purpose laser noise reduction
Local oscillators
1
2
3
6
5
4
IOUT
VDD
GND1
RFREQ
GND2
RAMP
Ordering Information
PART NUMBER
PACKAGE
TAPE & REEL PKG. DWG. #
EL6204CW-T7
6-Pin SOT-23
7" (3K pcs)
MDP0038
EL6204CW-T7A
6-Pin SOT-23
7" (250 pcs)
MDP0038
Data Sheet
March 1, 2004
2
Absolute Maximum Ratings
(T
A
= 25C)
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 . . . . . . . . . . . 0C to +70C
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . +150C
Storage Temperature Range . . . . . . . . . . . . . . . . . . -65C to +150C
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
= 25C, R
L
= 10
, R
FREQ
= 5210
(F
OSC
= 350MHz), R
AMP
=
2540
(I
OUT
= 50mA
P-P
measured at 60MHz), V
OUT
= 2.2V
PARAMETER
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
PSOR
Power Supply Operating Range
4.5
5.5
V
I
SO
Supply Current Disabled
V
OUT
< V
CUTOFF
550
750
A
I
STYP
Supply Current Typical Conditions
R
FREQ
= 5.21k
,
R
AMP
= 2.54k
18.5
22
mA
I
SLO
Supply Current Low Conditions
R
FREQ
= 30.5k
, R
AMP
= 12.7k
4.75
mA
I
SHI
Supply Current High Conditions
R
FREQ
= 3.05k
,
R
AMP
= 1.27k
32
mA
V
FREQ
Voltage at R
FREQ
Pin
1.27
V
V
RAMP
Voltage on RAMP Pin
1.27
V
V
CUTOFF
Monitoring Voltage of I
OUT
Pin
1.1
1.4
V
Oscillator Characteristics
V
DD
= +5V, T
A
= 25C, R
L
= 10
, R
FREQ
= 5210
(F
OSC
= 350MHz), R
AMP
= 2540
(I
OUT
= 50mA
P-P
measured at 60MHz), V
OUT
= 2.2V
PARAMETER
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
F
OSC
Frequency Tolerance
Unit-unit frequency variation
300
350
400
MHz
F
HIGH
Frequency Range High
R
FREQ
= 3.05k
600
MHz
F
LOW
Frequency Range Low
R
FREQ
= 30.5k
60
MHz
TC
OSC
Frequency Temperature Sensitivity
0C to +70C ambient
50
ppm/C
PSRR
OSC
Frequency Change
F/F
V
DD
from 4.5V to 5.5V
1
%
Driver Characteristics
V
DD
= +5V, T
A
= 25C, R
L
= 10
, R
FREQ
= 30.5k
(F
OSC
= 60MHz), R
AMP
= 2540
(I
OUT
= 50mA
P-P
measured at 60MHz), V
OUT
= 2.2V
PARAMETER
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
AMP
HIGH
Amplitude Range High
R
AMP
= 1.27k
100
mA
P-P
AMP
LOW
Amplitude Range Low
R
AMP
= 12.7k
10
mA
P-P
IOS
NOM
Offset Current @ 2.2V
R
FREQ
= 5210
,
V
OUT
= 2.2V
-4
mA
IOS
HIGH
Offset Current @ 2.8V
R
FREQ
= 5210
,
V
OUT
= 2.8V
-4.8
mA
IOS
LOW
Offset Current @ 1.8V
R
FREQ
= 5210
,
V
OUT
= 1.8V
-3.5
mA
I
OUTP-P
Output Current Tolerance
Defined as one standard deviation
2
%
Duty Cycle
Output Push Time/Cycle Time
R
FREQ
= 5210
43
%
PSRR
AMP
Amplitude Change of Output
I/I
V
DD
from 4.5V to 5.5V
-54
dB
T
ON
Auto Turn-on Time
Output voltage step from 0V to 2.2V
15
s
T
OFF
Auto Turn-off Time
Output voltage step from 2.2V to 0V
0.5
s
IOUT
N
Output Current Noise Density
R
FREQ
= 5210
,
measured @ 10MHz
2.5
nA/
Hz
EL6204
3
Recommended Operating Conditions
V
DD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V 10%
V
OUT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2V - 3V
R
FREQ
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3k
(min)
R
AMP
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.25k
(min)
F
OSC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60-600MHz
I
OUT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-100mA
PK-PK
Pin Descriptions
PIN NAME
PIN TYPE
PIN DESCRIPTION
1
IOUT
Current output to laser diode
2
VDD
Positive power for laser driver (4.5V - 5.5V)
3
GND1
Chip ground pin (0V for output)
4
RAMP
Set pin for output current amplitude
5
GND2
Chip ground pin (0V for RFREQ, RAMP)
6
RFREQ
Set pin for oscillator frequency
I
OUT
Control
V
OUT
I
OUT
Less than V
CUTOFF
OFF
More than V
CUTOFF
Normal Operation
EL6204
4
Typical Performance Curves
V
DD
= 5V, T
A
= 25C, R
L
= 10
, R
FREQ
= 5.21k
, R
AMP
= 2.54k
, V
OUT
= 2.2V unless otherwise specified.
Frequenc
y (MHz)
0
200
400
500
600
700
R
FREQ
(k
)
0
Frequency vs R
FREQ
5
15
25
35
10
20
30
100
300
Frequency=1824 * 1k
/ R
FREQ
(MHz)
Frequenc
y (MHz)
0
200
400
500
600
700
1k
/ R
FREQ
0
Frequency vs 1 / R
FREQ
0.05
0.15
0.25
0.35
0.1
0.2
0.3
100
300
Frequency=1824 * 1k
/ R
FREQ
(MHz)
O
u
t
put Current
(mA)
0
40
80
120
160
180
R
AMP
(k
)
0
Output Current vs R
AMP
2
6
10
14
4
8
12
20
60
O
u
t
put Current
(mA)
0
40
80
120
160
180
1k
/ R
AMP
0
Output Current vs 1 / R
AMP
0.1
0.5
0.7
0.9
0.3
0.6
0.8
20
60
100
140
100
140
0.2
0.4
Numbe
r
of P
a
r
t
s
0
100
500
Frequency (MHz)
31
0
Frequency Distribution
31
8
33
4
35
0
36
6
32
6
34
2
35
8
200
300
400
37
4
38
2
39
0
Typical
Production
Distortion
Numbe
r
of P
a
r
t
s
0
1
8
Frequency TC (ppm/C)
6
Frequency Drift with Temperature
30
54
18
42
3
5
7
66
78
90
Measured from
-40C to +85C
2
4
6
(over-shoot included)
Amplitude
PK-PK
=127 * 1k
/ R
AMP
(mA)
measured @60MHz
(over-shoot not included)
I
OUT PK-PK
measured @60/350/600MHz
(over-shoot included)
(over-shoot not included)
I
OUT PK-PK
measured @60/350/600MHz
Amplitude
PK-PK
=
127 * 1k
/ R
AMP
(mA)
measured @60MHz
EL6204
5
Typical Performance Curves
(Continued)
Frequenc
y (MHz)
340
345
355
360
Supply Voltage (V)
4.4
Frequency vs Supply Voltage
4.6
4.8
5.2
5.6
5
5.4
350
I
OU
T PK-PK
(m
A)
80
85
95
100
Supply Voltage (V)
4.4
Peak-to-Peak Output Current vs Supply Voltage
4.6
4.8
5.2
5.6
5
5.4
90
S
uppl
y Current (mA)
0
20
25
R
FREQ
(k
)
0
Supply Current vs R
FREQ
5
15
25
35
10
20
30
15
S
uppl
y Current (mA)
0
25
35
R
AMP
(k
)
0
Supply Current vs R
AMP
5
15
25
35
10
20
30
15
20
30
10
Suppl
y Current (mA)
17
18
20
21
Supply Voltage (V)
4.4
Supply Current vs Supply Voltage
4.6
4.8
5.2
5.6
5
5.4
19
Frequen
c
y (
M
Hz)
300
320
380
400
Ambient Temperature (C)
-50
Frequency vs Temperature
0
150
50
100
340
360
EL6204
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