atr0808

Manufacturer Part Numberatr0808
DescriptionThree Channel Laser Driver With Rf Oscillator And Two Outputs - Atmel Corporation
ManufacturerATMEL Corporation
atr0808 datasheet
 
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Features
Current-controlled Output Current Source with 3 Input Channels
Two Selectable Outputs for Grounded Laser Diodes
Output Current per Write Channel: 350 mA
Total Output Current: 500 mA
200 Ω Channel Input Resistance
On-chip RF Oscillator
Control of Two Different Swings by Use of Two External Resistors
Oscillator Frequency Range from 200 MHz to 500 MHz
Oscillator Swing: 100 mA
Single 5 V Power Supply
Common Enable/Disable Input
TTL/CMOS Control Signals
Small Pb-free QFN16 (4 mm × 4 mm) or SSO16 Package
Applications
DVD-ROM with CD-RW Capability
DVD+RW with CD-RW Capability
DVD-RW with CD-RW Capability
Writable Optical Drives
Description
The ATR0808 is a laser diode driver for the operation of two different grounded laser
diodes for DVD-RW/DVD+RW (650 nm) and CD-RW (780 nm). It includes three chan-
nels for three different optical power levels which are controlled by a separate IC. The
read channel generates a continuous output level, whereas the channels 2 and 3 are
provided as write channels with very fast switching speeds. Write current pulses are
enabled when a low signal is applied to the NE pins. All channels are summed
together and switched to one of the two IOUTA or IOUTB outputs by the select input
SELA. Each write channel (channel 2 and 3) can contribute up to 350 mA to the total
output current, up to 500 mA. The read channel can contribute up to 150 mA. Total
gains of 100 (read channel), 250 (channel 2 and 3) are provided between each refer-
ence current input and the selected output. Although, the reference inputs are current
inputs, voltage control is possible by using external resistors. An on-chip RF oscillator
is provided to reduce laser mode hopping noise during read mode. Swing can be set
independently for the two selectable outputs with two different resistors. Oscillation is
enabled by a high signal at the ENOSC pin. Complete output current and oscillator
switch-off is achieved by a low signal at the ENABLE input.
Three Channel
Laser Driver
with RF
Oscillator and
Two Outputs
ATR0808
Summary
Rev. 4724ES–DVD–01/04

atr0808 Summary of contents

  • Page 1

    ... Writable Optical Drives Description The ATR0808 is a laser diode driver for the operation of two different grounded laser diodes for DVD-RW/DVD+RW (650 nm) and CD-RW (780 nm). It includes three chan- nels for three different optical power levels which are controlled by a separate IC. The read channel generates a continuous output level, whereas the channels 2 and 3 are provided as write channels with very fast switching speeds ...

  • Page 2

    ... Figure 1. Block Diagram I3 NE3 I2 NE2 IR ENABLE ENOSC ATR0808 2 Channel 3 Channel 2 Read channel RF oscillator RF RSA RSB SELA IOUTA IOUTB 4724ES–DVD–01/04 ...

  • Page 3

    ... High: selects IOUTA, RSA Low: selects IOUTB, RSB Output current source B for laser diode External resistor to GND sets swing of oscillator B External resistor to GND sets swing of oscillator A Ground Output current source A for laser diode +5 V power supply for IOUT and circuit ATR0808 3 ...

  • Page 4

    ... Analog 11 RSA Analog 12 GND Supply 13 IOUTA Analog 14 VCC1 Supply 15 IR Analog 16 I2 Analog Paddle GND Supply ATR0808 GND RSA NE2 3 10 RSB NE3 4 9 IOUTB Function Input current, bias voltage approximately GND External resistor to GND sets frequency of oscillator ...

  • Page 5

    ... max V out stg = 70°C = 25°C Symbol R thJA Symbol RSA, RSB T amb ATR0808 Value -0.5 to +6.0 -0 +0.5 CC (1) ( 150 -65 to +125 Value (1) 115 Value 4.5 to 5.5 I < 2. < 1 > 3 > +70 Unit ...

  • Page 6

    ... Ordering Information Extended Type Number ATR0808-TCQG ATR0808-PEQG Package SSO16 ATR0808 6 Package Remarks Pb-free SSO16 Taped and reeled Pb-free QFN16 ( mm) Taped and reeled 4724ES–DVD–01/04 ...

  • Page 7

    ... Package QFN16 ( mm) 4724ES–DVD–01/04 ATR0808 7 ...

  • Page 8

    ... Fax: (81) 3-3523-7581 Disclaimer: Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company’s standard warranty which is detailed in Atmel’s Terms and Conditions located on the Company’s web site. The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein ...