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Features
* * * * * * * * * * * *
Current-controlled Output Current Source with 4 Input Channels LVDS Compatible Inputs at Channels 2, 3 and 4 with On-chip 100 Termination Separate Read-channel Enable Two Selectable Outputs for Grounded Laser Diodes Output Current per Channel up to 350 mA Total Output Current up to 600 mA On-chip RF Oscillator Control of 2 Different Swings and Frequencies by use of 4 External Resistors Oscillator Frequency Range from 200 MHz to 500 MHz Maximum Oscillator Current Amplitude 100 mApp Single 5V Power Supply Small Pb-free QFN24, 4 mm x 4 mm Package
Applications
* DVD+/-RW Dual Layer with CD-RW Capability * Recordable Optical Drives
4-Channel LVDS Laser Driver for Dual-layer Application ATR0849
1. Description
The ATR0849 is a laser diode driver designed to operate two different grounded laser diodes for DVD-RW/DVD+RW (650 nm) and CD-RW (780 nm). The device includes four channels for four different optical power levels. The write channels (channels 2 to 4) can be controlled by fast LVDS (Low Voltage Differential Signaling). The read channel generates a continuous output current, whereas channels 2 to 4 are designed as write channels with very fast switching speed. All channels are summed together and routed to one of the two outputs, IOUTA or IOUTB, controlled by the select input, SELA. Each write channel (channel 2 to 4) can contribute up to 350 mA to the total output current of up to 600 mA. The read channel can contribute up to 150 mA. Total gains of 100 (read channel) and 250 (channels 2, 3 and 4), are 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 available to reduce laser-mode hopping noise during read mode. The oscillator current amplitude 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 shutdown of the output currents is achieved by a low signal at the ENABLE input. In read mode, the reference currents (I2, I3, I4) should be switched off to reduce power consumption. In case of uncertain (balanced) enable signals, a built-in fail-safe circuit will reduce the laser diode output current to a safe value.
Summary
Rev. 4851BS-DVD-06/05
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
I4 E4
100
Channel 4
NE4 I3 E3
100
Channel 3 IOUTA
NE3
I2 E2 NE2
IOUTB
100
Channel 2
IR NER
Channel 1 Read channel
ENABLE ENOSC
RF oscillator
RFA RFB RSA RSB
SELA
2
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ATR0849
2. Pin Configuration
Figure 2-1. Pinning QFN24
SELA 17 RSB 16 GND 15 RSA 14 IOUTB 7 NE3 8 E4 13 ENABLE 9 10 11 12 NE4 VCC ENOSC VCC VCC
RFB RFA NER E2 NE2 E3
1 2 3 4 5 6
24 23 22 21 20 19 18 IOUTA
Table 2-1.
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Paddle
Pin Description
Symbol RFB RFA NER E2 NE2 E3 NE3 E4 NE4 ENOSC VCC VCC ENABLE IOUTB RSA GND RSB IOUTA SELA VCC IR I2 I3 I4 GND Type Analog Analog Digital Digital Digital Digital Digital Digital Digital Digital Supply Supply Digital Analog Analog Supply Analog Analog Digital Supply Analog Analog Analog Analog Supply Function External resistor to GND sets frequency of oscillator B External resistor to GND sets frequency of oscillator A Digital control of read channel (channel 1), active low Digital control of channel 2 Digital control of channel 2 Digital control of channel 3 Digital control of channel 3 Digital control of channel 4 Digital control of channel 4 Digital control of RF oscillator +5V power supply +5V power supply Enables output current, active high Output current source B for laser diode External resistor to GND sets swing of oscillator A Ground, power supply External resistor to GND sets swing of oscillator B Output current source A for laser diode High: selects IOUTA, RSA, RFA Low: selects IOUTB, RSB, RFB +5V power supply Input current, bias voltage approximately GND Input current, bias voltage approximately GND Input current, bias voltage approximately GND Input current, bias voltage approximately GND Ground, negative power supply
IR
I4
I3
I2
3
4851BS-DVD-06/05
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 any input Voltage bettween LVDS inputs (E2/NE2, E3/NE3, E4/NE4) Power dissipation Output voltage Junction temperature Storage temperature Notes: 1. RthJA 115 K/W at Tamb = 70 C 2. RthJA 15 K/W at Tamb = 25 C Symbol VCC Vin Vdmax Pmax Vout Tj Tstg Value -0.5 to +6.0 -0.5 to VCC + 0.5 1.7 0.7(1 ) to 1(2) -0.5 to VCC - 1 150 -65 to +125 Unit V V V W V C C
4. Thermal Resistance
Parameters Junction ambient Note: Measured with multi-layer test board (JDEC standard) Symbol RthJA Value 125 Unit K/W
5. Recommended Operating Range
Parameters Supply voltage Input current Voltage bettween LVDS inputs (E2/NE2, E3/NE3, E4/NE4) External resistor to GND to set oscillator frequency External resistor to GND to set oscillator swing Operating temperature range Symbol VCC IIR, II2, II3, II4 Vd RFA, RFB RSA, RSB Tamb Value 4.5 to 5.5 < 1.5 0.5 >3 > 100 0 to +70 Unit V mA V k C
4
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ATR0849
6. Ordering Information
Extended Type Number ATR0849-PFQG Package Pb-free QFN24 (4 mm x 4 mm) Remarks Taped and reeled
7. Package Information
5
4851BS-DVD-06/05
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4851BS-DVD-06/05

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