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Features
* Two High-side Outputs for Grounded Red Laser Diodes * Total Output Current up to 700 mA at VLD = 3.8V * One Low-side Output for Floating Blue Laser Diode * Total Output Current up to 550 mA, External LD Supply Voltage * Five Channels with Gain DACs * Two Current Inputs for Read and Write Channels * Channel 2 Current Contribution up to 350 mA * LVDS-compatible Enable Inputs at Channels 2, 3, 4 and HFM * Optional SyncDrive Technology for Increased Timing Accuracy * Common Enable Input for All Channels * Low-EMI High-Frequency Modulator (HFM) with Wiper
- Frequency Range 200 MHz to 500 MHz - Swing up to 100 mApp - Erase Modulation Supported
3-output Laser Driver with 5 Channels and Serial Interface ATR0881 Preliminary Summary
* Serial Interface (SPI and TWI) with Write and Read Operation
- - - - - - - - - LD Output Channel Gains and Input Current Source Overcurrent Protection HFM Frequency and Swing HFM Frequency Measurement LVDS/Single Ended Input Configurations SyncDrive Mode Temperature Monitor Blue LD Voltage Monitor
* Small, Pb-free, 24-pin, Paddle-up Package 4 mm x 4 mm
Applications
* Blu-ray/DVD/CD Recordable Drives * Blu-ray Combo Drives
Benefits
* The Serial Interface Yields the Following Benefits:
- - - - Low Pin Count and Small Package Flexible Channel Configurations Digital Gain Control High Accuracy of HFM Frequency
NOTE: This is a summary document. The complete document is available. For more information, please contact your local Atmel sales office.
9105BS-DVD-03/08
1. Description
The ATR0881 is a laser diode driver designed to operate two grounded red laser diodes for CD and DVD and one floating blue laser diode for Blu-ray. The floating blue laser diode needs an extra supply voltage VH. The serial interface (SPI and TWI supported) makes ATR0881 very flexible and configurable for a wide range of applications. Five channels can be assigned to one of the two reference current inputs IR and IW. The channel gains can be individually set by DACs. Prescalers with 2 bits are provided to increase the resolution. Overcurrent protection circuits supervise the reference current inputs. The channel enable inputs can be configured as single ended or LVDS. In SyncDrive mode, channels 3, 4, and 5 are synchronized to channel 2. The on-chip spread spectrum HFM with low EMI reduces laser mode hopping noise. All HFM frequency and swing parameters can be set by the serial interface. A high frequency-accuracy can be achieved by the frequency counter feature. HFM enable can be configured as single ended or LVDS or automatically-disabling by write channels.
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ATR0881 [Preliminary]
9105BS-DVD-03/08
ATR0881 [Preliminary]
2. Pin Configuration
Figure 2-1. Pinning QFN24
IOUTC SDATA SENB RREF SCLK VDD
24 23 22
21 20 19 18 17
NE5 NE4 E3 NE3 E2 NE2
1 2 3 4 5 6 7 8 9 10 11 12
GNDC IOUTB VDDAB VDDAB IOUTA GND
Exposed Upside Paddle
16 15 14 13
NENO
ENO
VDD
NEX
IW
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 Corners
Pin Description
Symbol NE5 NE4 E3 NE3 E2 NE2 ENO NENO NEX VDD IW IR GND IOUTA VDDAB IOUTB GNDC IOUTC RREF VDD SENB SDATA SCLK Type Digital in Digital in Digital in Digital in Digital in Digital in Digital in Digital in Digital in Supply Analog in Analog in Supply Analog out Supply Analog out Supply Analog out Analog in Supply Digital in Digital in/out Digital in Function Enable channel 5 (inverting, single ended) or enable channel 4 (non-inverting, LVDS) Enable channel 4 (inverting, LVDS, or single ended) Enable channel 3 (non-inverting, LVDS) Enable channel 3 (inverting, LVDS, or single ended) Enable channel 2 (non-inverting, LVDS) Enable channel 2 (inverting, LVDS, or single ended) Enable HFM (non-inverting, LVDS, or single ended) Enable HFM (inverting, LVDS) Multipurpose enable input (inverting, all channels, channel 1, write channels) Power supply Reference current input for write channels Reference current input for read channels GND Laser diode anode connection Power supply for outputs IOUTA and IOUTB Laser diode anode connection GND for output IOUTC Laser diode cathode connection Reference current input for HFM and overcurrent detector Power supply Serial enable Serial data input and output Serial clock Paddle - at least one corner has to be connected to GND
IR
3
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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 pin Current into IR, IW and RREF pins (no voltage source allowed) Power dissipation Junction temperature Storage temperature Notes: 1. RthJA 115C/W at Tamb = 70C 2. RthJA 115C/W at Tamb = 25C 11, 12, 20 Pin 10, 15, 16, 21 Symbol VDD VIN IIN P Tj Tstg Value -0.3 to +6.0 -0.3 to VDD + 0.3 0 to 4 0.7(1) to 1(2) 150 -65 to +125 Unit V V mA W C C
4. Thermal Resistance
Parameters Junction-ambient Note: Symbol RthJA Value 50 Unit C/W
Package thermal resistance is measured on the ATR0881 demo board without heat spreader. Users should ensure that the junction temperature never exceeds 150C. Thermal resistance from junction to case and to ambient depends very much on the PCB layout and on heat spreading measures.
5. Recommended Operating Conditions
Parameters Supply voltage Input current External reference resistor to GND Operating voltage at IOUTC output Operating temperature range Note: Pin 10, 15, 16, 21 11, 12 20 19 Symbol VDD IR, IW RREF VIOUTC Tamb Value 4.5 to 5.5 2 13 1% 0.8 to 4.0
(1)
Unit V mA k V C
0 to +70
1. Adjust supply voltage VH of blue laser diode to keep VIOUTC within the specified range for all operating modes of the laser diode to avoid degradation of the laser diode.
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ATR0881 [Preliminary]
9105BS-DVD-03/08
ATR0881 [Preliminary]
6. Ordering Information
Extended Type Number ATR0881-PTQW Package QFN24_PUP Remarks Taped and reeled
7. Package Information
Package: QFN_PUP_4 x 4_24L Exposed pad 2.2 x 2.2 Dimensions in mm Not indicated tolerances 0.05 1 Top 24 18 13 12 2.20.15 4 0.2 0.750.1 Z 7 0.5 nom. 2.5 Bottom 19 24 1
6
6
0.35
Z 10:1
0.40.1
Drawing-No.: 6.543-5106.01-4 Issue: 1; 18.03.04
0.35 0.230.07
technical drawings according to DIN specifications
8. Revision History
Please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this document. Revision No. 9105BS-DVD-03/08 History * All TWI parts added * Applications on page 1 changed * Section 4 "Thermal Resistance" on page 4 changed
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9105BS-DVD-03/08
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Product Contact
Web Site www.atmel.com Technical Support dvd_ldd@atmel.com Sales Contact www.atmel.com/contacts
Literature Requests www.atmel.com/literature
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9105BS-DVD-03/08

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