CyberHome DVR 1600 DVD Recorder
The controller is a MediaTek chipset:
MT8105GE MT1818E MT1816E
Memories:
W981616CH-7 HY5DU561622DT-5
Flash:
29LV160BBTC-70 26LV800BTC-55
Motor control:
BD7905FS
Contains Cyber World
combination DVD +-RW and CD head.
SHAME on them for not providing any technical information on their web page!
The laser diodes are both controlled by a chip marked 6839CL Z B0513DTQ (accented)e
EL6839CLZ is manufactured by Intersil's elantec line.
SHAME on Intersil for declaring the datasheet a controlled document.
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 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 WEN2WEN2B, 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.
WEN2-WEN2B, WEN3-WEN3B and WEN4-WEN4B are LVDS input pins with 100[ohm] 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 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
- 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 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 & DVD drives
Pins:
- RFREQ
- GND
- WENRB
- WEN2
- WEN2B
- WEN3
- WEN3B
- WEN4
- WEN4B
- OSEN
- GND
- SEL1
- ENA
- RAMP1
- RAMP2
- GND
- IOUT2
- IOUT2
- VDDN
- VDDN
- GND
- GND
- IOUT1
- IOUT1
- VDDN
- VDDQ
- GND
- IINR
- IIN2
- IIN3
- IIN4
- RFREQ1