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Features
* * * * * * * * * * * * *
Current-controlled Output Current Source, 3 Input Channels Two Selectable Outputs for Grounded Laser Diodes Output Current per Channel up to 250 mA Total Output Current to 300 mA (Minimum) Rise Time 1.0 ns, Fall Time 1.1 ns On-chip RF Oscillator Control of 2 Different Swings by Use of 2 external Resistors Oscillator Frequency Range from 200 MHz to 600 MHz Oscillator Swing to 100 mA Single 5V Power Supply Common Enable/Disable Input TTL/CMOS Control Signals Small PB-free QFN16 (4 mm x 4 mm) or SSO16 Package
3-channel Laser Driver with RF Oscillator and 2 Outputs T0806 Summary
Applications
* DVD-ROM with CD-RW Capability (Combo Drives) * Combo Drives with CD and DVD Writing Capability
1. Description
The T0806 is a laser diode driver for the operation of two different grounded laser diodes for DVD-RAM (650 nm) and CD-RW (780 nm) drives. It includes three channels for three different optical power levels which are controlled by a separate IC. The read channel generates a continuous output level whereas 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 outputs IOUTA or IOUTB by the select input SELA. Each channel can contribute up to 250 mA to the total output current of up to 300 mA. A total gain of 100 is provided between each reference 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.
Rev. 4522FS-DVD-11/05
Note: This is a summary document. A complete dorcument is available under NDA. For more information, please contact your local Atmel sales office.
Figure 1-1.
Block Diagram
I3 NE3 Channel 3
IOUTA IOUTB
I2 NE2
Channel 2
IR ENABLE
Read channel
ENOSC
RF oscillator
RF
RSA RSB
SELA
2
T0806
4522FS-DVD-11/05
T0806
2. Pin Configuration
Figure 2-1. Pinning SSO16
IR I2 I3 RF NE2 NE3 ENABLE ENOSC 1 2 3 4 16 15 14 13
VCC1 IOUTA GND RSA RSB IOUTB SELA VCC2
T0806
5 6 7 8 12 11 10 9
Table 2-1.
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Pin Description SSO16
Symbol IR I2 I3 RF NE2 NE3 ENABLE ENOSC VCC2 SELA IOUTB RSB RSA GND IOUTA VCC1 Type Analog Analog Analog Analog Digital Digital Digital Digital Supply Digital Analog Analog Analog Supply Analog Supply Function Input current, bias voltage approximately GND Input current, bias voltage approximately GND Input current, bias voltage approximately GND External resistor to GND sets oscillator frequency of oscillator A Digital control of channel 2 (low active) Digital control of channel 3 (low active) Enables output current (high active) Enables RF oscillator (high active) +5V power supply for IOUT 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 +5V power supply for IOUT and circuit
3
4522FS-DVD-11/05
Figure 2-2.
Pinning QFN16
I3 RF NE2 NE3
1 2 3 4
16 15 14 13 12 11 10 9 5678 ENABLE ENOSC VCC2 SELA
I2 IR VCC1 IOUTA GND RSA RSB IOUTB
Table 2-2.
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Paddle
Pin Description QFN16
Symbol I3 RF NE2 NE3 ENABLE ENOSC VCC2 SELA IOUTB RSB RSA GND IOUTA VCC1 IR I2 GND Type Analog Analog Digital Digital Digital Digital Supply Digital Analog Analog Analog Supply Analog Supply Analog Analog Supply Function Input current, bias voltage approximately GND External resistor to GND sets oscillator frequency Digital control of channel 2 (low active) Digital control of channel 3 (low active) Enables output current (high active) Enables RF oscillator (high active) +5V power supply for IOUT 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 +5V power supply for IOUT and circuit Input current, bias voltage approximately GND Input current, bias voltage approximately GND Ground
4
T0806
4522FS-DVD-11/05
T0806
3. Absolute Maximum Ratings
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Parameters Supply voltage Input voltage at IR, I2, I3 Input voltage at NE2, NE3, ENOSC Output voltage Total output current Output current per channel Power dissipation Junction temperature Storage temperature range Notes: 1. RthJA 115 K/W, Tamb = 70 C 2. RthJA 115 K/W, Tamb = 25 C Symbol VCC VIN1 VIN2 VOUT IOUT IOUT (IR, I2, I3) PMAX TJ TStg 0.7 Value -0.5 to +6.0 -0.5 to +1.0 -0.5 to VCC +0.5 -0.5 to VCC -1 350 300
(1)
Unit V V V V mA mA
(2)
to 1
W C C
150 -65 to +125
4. Thermal Resistance
Parameters Junction ambient Symbol RthJA Value 135 Unit K/W
5. Recommended Operating Conditions
Parameters Supply voltage range Input current External resistor to GND to set oscillator frequency External resistor to GND to set oscillator swing Operating temperature range Symbol VCC IIR/II2/II3 RF RSA, RSB Tamb Value 4.5 to 5.5 < 3.0 >3 >1 0 to +70 Unit V mA k k C
5
4522FS-DVD-11/05
6. Ordering Information
Extended Type Number T0806-TCQG T0806-PEQG Package SSO16 Pb-free QFN16 (4 mm x 4 mm) Remarks Taped and reeled, Pb-free Taped and reeled, Pb-free
7. Package Information
6
T0806
4522FS-DVD-11/05
T0806
7
4522FS-DVD-11/05
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4522FS-DVD-11/05

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