EL6240C - Product Brief
EL6240C - Product Brief
Dual Laser Driver with APC Amp
Features
• Read + 2 write channel laser driver
with oscillator and fast I/V
amplifier plus a separate ROM
laser driver with oscillator
• 200V/µs I/V amplifier
• 100X gain, 100mA low noise read
channel
• 250X gain, 250mA and 150X gain,
150mA write channels
• 500MHz, 100mA
P-P
oscillator
• Write rise/fall times = 0.8ns
• Single +5V supply
General Description
The EL6240C is a combination read + 2 write level laser driver and IV
amplifier, with an extra read + oscillator ROM channel for use in dual-
laser ‘combo’ applications. A separate (amplitude and frequency)
oscillator modulates the selected output for laser noise reduction dur-
ing read or write.
The CD pin, when high, selects the CD (write) laser. Positive current
supplied to the IIN lines, through a user selected external resistor,
allow the full scale range of each amplifier to be matched to the full
scale range of the users control DACs. When the write laser is
selected, and the WEN pins are switched low, the respective current is
summed to the output with 1ns rise and fall times. When the CD pin is
low, the ROM laserdiode is driven by output I
OUT2
, and no current
will appear at output I
OUT1
.
The 100mA
P-P
(max) oscillator is switched on and off by the OSCEN
line. The CD line allows the oscillator to operate at different ampli-
tudes and frequencies for each laser.
The entire chip is powered down when ENABLE is low. The user can
define the gain of the I/V amplifier. With a slew rate of 200V/µs, the
I/V amplifier can normally settle to 1% within 30ns.
Applications
•
•
•
•
Combo CD-RW + DVD-ROM
CD-RW to 16X
CD-R to 32X
Writable optical disk drives
Ordering Information
Part No
EL6240CU
EL6240CL
Temp. Range
-40°C to +85°C
-40°C to +85°C
Package
24-Pin QSOP
24-Pin LPP
Outline #
MDP0040
MDP0046
Connection Diagrams
1 VOUT
2 VREF
3 IINR
4 IIN2
5 RF1
6 IIN3
7 GND
8 RF2
9 WEN2
10 CD
11 WEN3
12 NC
PDIN 24
22 VOUT
23 VREF
24 IINR
20 VCC
19 VCC
18 IOUT1
17 GND
Thermal Pad
16 GND
15 RAMP1
14 RAMP2
13 ENABLE
VCC 10
IOUT2 11
OSCEN 12
WEN3 8
NC 9
VDD 23
VDD 22
IIN2 1
IOUT1 21
RF1 2
GND 20
IIN3 3
GND 19
GND 4
RAMP1 18
RF2 5
RAMP2 17
WEN2 6
ENABLE 16
CD 7
OSCEN 15
IOUT2 14
VDD 13
21 PDIN
October 25, 2001
Note:
All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a “controlled document”. Current revisions, if any, to these
specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation.
© 2001 Elantec Semiconductor, Inc.
ELANTEC [ ELANTEC SEMICONDUCTOR ]
