EL6839 Datasheet, PDF (1/2 Pages) Intersil Corporation – Dual 4-Channel Driver with Oscillator and LVDS

®
PRELIMINARY
Data Sheet
Dual 4-Channel Driver with Oscillator and
LVDS
The EL6839 is a high performance,
dual output, laser driver for writeable
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.
WEN2-WEN2B, WEN3-WEN3B and WEN4-WEN4B are
LVDS input pins with 100Ω external termination. Output write
current pulses are enabled when a high is applied to the
WEN2-WEN2B, WEN3-WEN3B, or WEN4-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 RF oscillators frequency is determined by R_FREQ1 or
R_FREQ2, and its amplitude by R_AMP1 or R_AMP2.
Ordering Information
PART
NUMBER TEMP. RANGE PACKAGE PKG. DWG. #
EL6839CL
32-Pin QFN
-
MDP0046
EL6839CL-T7 32-Pin QFN
7”
MDP0046
EL6839CL-T13 32-Pin QFN
13”
MDP0046
EL6839CLZ
32-Pin QFN
-
(See Note)
(Pb-free)
MDP0046
EL6839CLZ-T7 32-Pin QFN
7”
(See Note)
(Pb-free)
MDP0046
EL6839CLZ-
32-Pin QFN
13”
T13 (See Note) (Pb-free)
MDP0046
NOTE: Intersil Pb-free products employ special Pb-free material
sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which is compatible with both SnPb and
Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed
the Pb-free requirements of IPC/JEDEC J Std-020B.
July 15, 2004
EL6839
FN7227.2
Features
• Two channels for CD or DVD
• Voltage-controlled output current source requiring one
external set resistor per channel
• LVDS interface
• 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
• Pb-free available
Applications
• Super combo drives
• DVD drives
Get FULL DATASHEET
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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