1
FN7228
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.
PRELIMINARY
EL6838
Dual 4-Channel Driver with Oscillator
The EL6838 is a high performance,
dual output, laser driver for writeable
`super-combo' CD - DVD drives. The
ENA pin enables the chip, while the SEL1 pin selects the
I
OUT
pin. Various waveforms can be generated where the
amplitude is determined by the currents flowing into I
INR
,
I
IN2
, I
IN3
, and I
IN4
. The timing is determined by the signals
at OUTEN2, OUTEN3, and OUTEN4. The oscillator is
enabled when OSCEN is high. The amplified I
INR
current of
the selected channel is enabled when the ENA pin is high.
The total output current is the sum of the read current, the
enabled write currents, and the oscillator current when
enabled.
Usually a voltage DAC will drive a resistor that is in series
with the I
INR
, I
IN2
, I
IN3
, and I
IN4
input. The resistor allows
the user to optimize the current gain for each channel.
Output write current pulses are enabled when a low is
applied to the OUTEN2, OUTEN3, or OUTEN4 pin. The
write current will flow to the selected output. When SEL1 is
high I
OUT1
is selected. OUTENR enables read and oscillator
current.
The R
F
oscillators frequency is determined by R
FREQ1
or
R
FREQ2
, and its amplitude by R
AMP1
or R
AMP2
.
Features
Two channels for CD or DVD
Voltage-controlled output current source requiring one
external set resistor per channel
Rise time = 0.8ns
Fall time = 0.8ns
Channel 2 to 250mA max
Channel 3 to 150mA max
Channel 4 to 100mA max
On chip oscillator with frequency and amplitude control by
use of external resistors to ground
Oscillator frequency to 600MHz
Oscillator amplitude to 100mA
P-P
Single +5V supply (10%)
Chip Enables for power savings
Applications
Super Combo drives
Pinout
EL6838
(24-PIN LPP)
TOP VIEW
Ordering Information
PART
NUMBER
TEMP. RANGE
PACKAGE
PKG. DWG #
EL6838CL
0C to +70C
24-Pin LPP
MDP0046
19
18
17
16
15
14
13
24
23
22
21
20
8
9
10
11
12
1
2
3
4
5
6
7
THERMAL
PAD
IIN4
RFREQ1
RFREQ2
GND
OUTENR
OUTEN2
OUTEN3
VDDN
IOUT1
GND
RAMP1
RAMP2
VDDN
IOUT2
II
N3
II
N2
II
NR
GND
VDDQ
OUT
E
N4
OS
CEN
SE
L1
ENA
GND
PINOUT NOT FINALIZED
Data Sheet
June 30, 2003
Get FULL DATASHEET
2
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Intersil Corporation's quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
EL6838
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