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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 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 WEN2-WEN2B, WEN3-WEN3B, and WEN4-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. Output write current pulses are enabled when a high is applied to the WEN2-WEN2B, WEN3-WEN3B, or WENWEN4B 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 * External 100 LVDS termination * 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
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 0C to +70C PACKAGE 32-Pin LPP PKG. DWG. # MDP0046
RFREQ2 1 GND 2 WENRB 3
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WEN2 4 WEN2B 5 WEN3 6 WEN3B 7 WEN4 8 WEN4B 9
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.
EL6835
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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.
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