EL6838 ® June 30, 2003 FN7228 Dual 4-Channel Driver with Oscillator Features The EL6838 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 OUTEN2, OUTEN3, and OUTEN4. The oscillator is enabled when OSCEN 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. • Two channels for CD or DVD 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. • Oscillator frequency to 600MHz • 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 amplitude to 100mAP-P • Single +5V supply (±10%) • Chip Enables for power savings Applications • Super Combo drives Pinout 0°C to +70°C 24-Pin LPP MDP0046 IIN4 1 19 VDDN RFREQ1 2 18 IOUT1 RFREQ2 3 17 GND THERMAL PAD GND 4 16 RAMP1 OUTENR 5 15 RAMP2 OUTEN2 6 14 VDDN OUTEN3 7 13 IOUT2 OUTEN4 8 Get FULL DATASHEET 20 VDDQ PKG. DWG # GND 12 PACKAGE 21 GND EL6838CL TEMP. RANGE SEL1 10 PART NUMBER 24 IIN3 Ordering Information 22 IINR EL6838 (24-PIN LPP) TOP VIEW 23 IIN2 The RF oscillators frequency is determined by RFREQ1 or RFREQ2, and its amplitude by RAMP1 or RAMP2. • Rise time = 0.8ns OSCEN 9 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 IOUT1 is selected. OUTENR enables read and oscillator current. • Voltage-controlled output current source requiring one external set resistor per channel ENA 11 Data Sheet PRELIMINARY PINOUT NOT FINALIZED 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 © 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. EL6838 All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality 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. For information regarding Intersil Corporation and its products, see www.intersil.com 2