ATR0881 ATMEL | Alldatasheet
Document overview
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Technical content
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 Serial Interface (SPI and TWI) with Write and Read Operation –L D O u t p u t – 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 × 4m m
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 3-output Laser Driver with 5 Channels and Serial Interface ATR0881 Preliminary Summary 9105BS–DVD–03/08
9105BS–DVD–03/08 ATR0881 [Preliminary] 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 V H. 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 in crease the resolution. Overcurrent protection cir- cuits 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.
9105BS–DVD–03/08 ATR0881 [Preliminary] 2. Pin Configuration Figure 2-1. Pinning QFN24 78 9 1 0 1 1 1 2 NE2 NE3 NE5 NE4 IOUTA GND Exposed Upside Paddle VDDAB VDDAB GNDC ENO NENO IW IR NEX VDD SCLK SDATA RREF IOUTC SENB VDD IOUTB 24 23 22 21 20 19 Table 2-1. Pin Description Pin Symbol Type Function
1 NE5 Digital in Enable channel 5 (inverting, single ended) or enable channel 4 (non-inverting, LVDS)
2 NE4 Digital in Enable channel 4 (inverting, LVDS, or single ended)
3 E3 Digital in Enable channel 3 (non-inverting, LVDS)
4 NE3 Digital in Enable channel 3 (inverting, LVDS, or single ended)
5 E2 Digital in Enable channel 2 (non-inverting, LVDS)
6 NE2 Digital in Enable channel 2 (inverting, LVDS, or single ended)
7 ENO Digital in Enable HFM (non-inverting, LVDS, or single ended)
8 NENO Digital in Enable HFM (inverting, LVDS)
9 NEX Digital in Multipurpose enable input (inver ting, all channels, channel 1, write channels)
10 VDD Supply Power supply
11 IW Analog in Reference current input for write channels
12 IR Analog in Reference current input for read channels
13 GND Supply GND
14 IOUTA Analog out Laser diode anode connection
15, 16 VDDAB Supply Power supply for outputs IOUTA and IOUTB
17 IOUTB Analog out Laser diode anode connection
18 GNDC Supply GND for output IOUTC
19 IOUTC Analog out Laser diode cathode connection
20 RREF Analog in Reference current inpu t for HFM and overcurrent detector
21 VDD Supply Power supply
22 SENB Digital in Serial enable
23 SDATA Digital in/out Serial data input and output
24 SCLK Digital in Serial clock
Corners Paddle – at least one corner has to be connected to GND
9105BS–DVD–03/08 ATR0881 [Preliminary] 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 Pin Symbol Value Unit Supply voltage 10, 15, 16, 21 VDD –0.3 to +6.0 V Input voltage at any pin V IN –0.3 to VDD + 0.3 V Current into IR, IW and RREF pins (no voltage source allowed) 11, 12,
20 IIN 0 to 4 mA
Power dissipation P 0.7 (1) to 1(2) W Junction temperature T j 150 °C Storage temperature T stg –65 to +125 °C Notes: 1. R thJA ≤ 115°C/W at Tamb =7 0 ° C 2. R thJA ≤ 115°C/W at Tamb =2 5 ° C 4. Thermal Resistance Parameters Symbol Value Unit Junction-ambient R thJA 50 °C/W Note: Package thermal resistance is measured on the ATR0881 demo board without heat spreader. Users should ensure that the junction temperature never exceeds 150°C. 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 Pin Symbol Value Unit Supply voltage 10, 15, 16, 21 VDD 4.5 to 5.5 V Input current 11, 12 I R, IW ≤ 2m A External reference resistor to GND 20 R REF 13 ±1% k Ω Operating voltage at IOUTC output 19 V IOUTC 0.8 to 4.0(1) V Operating temperature range T amb 0 to +70 °C Note: 1. Adjust supply voltage V H 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.
9105BS–DVD–03/08 ATR0881 [Preliminary] 7. Package Information 8. Revision History 6. Ordering Information Extended Type Number Package Remarks ATR0881-PTQW QFN24_PUP Taped and reeled Package: QFN_PUP_4 x 4_24L Exposed pad 2.2 x 2.2 Dimensions in mm Not indicated tolerances ±0.05 Z Z 10:1 24 24 712 Top Bottom 2.2 ±0.15 0.35 0.35 0.23±0.07 0.4±0.1 0.2 4 2.50.75±0.1 0.5 nom. specifications according to DIN technical drawings Issue: 1; 18.03.04 Drawing-No.: 6.543-5106.01-4 Please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this document. Revision No. History 9105BS-DVD-03/08
- All TWI parts added
- Applications on page 1 changed
- Section 4 “Thermal Resistance” on page 4 changed
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