®
EL6835
Data Sheet
July 1, 2003
FN7231
PRELIMINARY
Dual 4-Channel Driver with Oscillator &
LVDS
The EL6835 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 WEN2-WEN2B, WEN3-WEN3B, and WEN4-WEN4B. The
oscillator is enabled when OSEN 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 high is
applied to the WEN2-WEN2B, WEN3-WEN3B, or WEN-
WEN4B pin. The write current will flow to the selected
output. When SEL1 is high I
OUT1
is selected. WENRB
enables read and oscillator current when low.
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
• External 100Ω LVDS termination
• 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 ENAs for power savings
Applications
• Super combo drives
Pinout
EL6835
(32-PIN LPP)
TOP VIEW
32 RFREQ1
26 VDDQ
25 VDDN
24 IOUT1
23 IOUT1
22 GND
THERMAL
PAD
21 RAMP1
20 RAMP2
19 VDDN
18 IOUT2
17 IOUT2
OSEN 10
GND 12
NC 13
SEL1 14
ENA 15
GND 16
GND 11
27 GND
28 IINR
31 IIN4
30 IIN3
29 IIN2
Ordering Information
PART
NUMBER
EL6835CL
TEMP. RANGE
0°C to +70°C
PACKAGE
32-Pin LPP
PKG. DWG. #
MDP0046
RFREQ2 1
GND 2
WENRB 3
Get FULL DATASHEET
WEN2 4
WEN2B 5
WEN3 6
WEN3B 7
WEN4 8
WEN4B 9
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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.
EL6835
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
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
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