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EL6836
Data Sheet July 1, 2003 FN7351
PRELIMINARY
Dual 4-Channel Driver with Oscillator
The EL6836 is a high performance, dual output, laser driver for writeable DVD drives. The ENA pin enables the chip, while the SEL1 pin selects the IOUT pin. Various waveforms can be generated where the amplitude is determined by the currents flowing into IINR, IIN2, IIN3, and IIN4. The timing is determined by the signals at WEN2B, WEN3B, and WEN4B. The oscillator is enabled when OSEN is high. The amplified IINR 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 IINR, IIN2, IIN3, and IIN4 input. The resistor allows the user to optimize the current gain for each channel. WEN2B, WEN3B, and WEN4B are CMOS input pins with a 1.68V threshold. Output write current pulses are enabled when a low is applied to the WEN2B, WEN3B, or WEN4B pin. The write current will flow to the selected output. When SEL1 is high IOUT1 is selected. WENRB enables read and oscillator current when low. The RF oscillators frequency is determined by RFREQ1 or RFREQ2, and its amplitude by RAMP1 or RAMP2.
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 100mAP-P * Single +5V supply (10%) * Chip ENAs for power savings
Applications
* Super combo drives * DVD drives
Pinout
EL6836 (32-PIN LPP) TOP VIEW
32 RFREQ1
Ordering Information
PART NUMBER EL6836CL TEMP. RANGE 0C to +70C PACKAGE 32-Pin LPP PKG. DWG. # MDP0046
26 VDDQ 25 VDDN 24 IOUT1 23 IOUT1 22 GND 21 GND 20 VDDN 19 VDDN 18 IOUT2 17 IOUT2 GND 16
RFREQ2 1 GND 2 WENRB 3
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NC 4 WEN2B 5 NC 6 WEN3B 7 NC 8 WEN4B 9 OSEN 10 SEL1 12 ENA 13 RAMP1 14 RAMP2 15 GND 11 THERMAL PAD
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright (c) 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.
27 GND
28 IINR
31 IIN4
30 IIN3
29 IIN2
EL6836
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