1
FN7353
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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EL6238
Dual 4 Channel Driver with Oscillator
The EL6238 is a high performance,
dual output, laser driver for writeable
`super-combo' CD - DVD drive. 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
inputs. 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
Ordering Information
PART NUMBER TEMP. RANGE
PACKAGE
PKG. DWG. #
EL6238CL
0C to +70C
24-Pin LPP
MDP0046
Data Sheet
July 25, 2003
2
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EL6238
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