ATR0807

ATR0807 ATMEL | Alldatasheet

Document overview

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Technical content

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  500 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 x 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 ATR0807 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 ATR0807 (Summary) Rev. 4723CS–DVD–07/03

2 ATR0807

Figure 1. Block Diagram

Figure 2. Pinning SSO16

1 IR Analog Input current, bias voltage approximately GND

2 I2 Analog Input current, bias voltage approximately GND

3 I3 Analog Input current, bias voltage approximately GND

4 RF Analog External resistor to GND sets frequency of oscillator

5 NE2 Digital Digital control of channel 2 (low active)

6 NE3 Digital Digital control of channel 3 (low active)

7 ENABLE Digital Enables output current (high active)

8 ENOSC Digital Enables RF oscillator (high active)

9 VCC2 Supply +5 V power supply for IOUT

10 SELA Digital High: selects IOUTA, RSA

11 IOUTB Analog Output current source B for laser diode

12 RSB Analog External resistor to GND sets swing of oscillator B

13 RSA Analog External resistor to GND sets swing of oscillator A

14 GND Supply Ground

15 IOUTA Analog Output current source A for laser diode

16 VCC1 Supply +5 V power supply for IOUT and circuit

4 ATR0807

Figure 3. Pinning QFN16

1 I3 Analog Input current, bias voltage approximately GND

2 RF Analog External resistor to GND sets frequency of oscillator

3 NE2 Digital Digital control of channel 2 (low active)

4 NE3 Digital Digital control of channel 3 (low active)

5 ENABLE Digital Enables output current (high active)

6 ENOSC Digital Enables RF oscillator (high active)

7 VCC2 Supply +5 V power supply for IOUT

8 SELA Digital High: selects IOUTA, RSA

9 IOUTB Analog Output current source B for laser diode

10 RSB Analog External resistor to GND sets swing of oscillator B

11 RSA Analog External resistor to GND sets swing of oscillator A

12 GND Supply Ground

13 IOUTA Analog Output current source A for laser diode

14 VCC1 Supply +5 V power supply for circuit

15 IR Analog Input current, bias voltage approximately GND

16 I2 Analog Input current, bias voltage approximately GND

4723CS–DVD–07/03 Absolute Maximum Ratings Parameters Symbol Value Unit Supply voltage V CC -0.5 to +6.0 V Input voltage at any input V in -0.5 to VCC +0.5 V Power dissipation P max 0.7 (1) to 1 (2) W Output voltage V out -0.5 to VCC -1 V Junction temperature T j 150 °C Storage temperature T stg -65 to +125 °C Notes: 1. R thJA /g163 115 K/W at Tamb = 70°C 2. R thJA /g163 115 K/W at Tamb = 25°C Thermal Resistance Parameters Symbol Value Unit Junction ambient R thJA 115 (1) K/W Notes: 1. Measured with multi-layer test board (JEDEC standard) Recommended Operating Conditions Parameters Symbol Value Unit Supply voltage V CC 4.5 to 5.5 V Input current I IR, II2, II3 IIR < 2.0, II2 = II3 < 1.5 mA External resistor to GND to set oscillator frequency RF > 3 k /g87 External resistor to GND to set oscillator swing RSA, RSB > 1 k /g87 Operating temperature range T amb 0 to +70 °C

6 ATR0807

4723CS–DVD–07/03

Ordering Information

Extended Type Number Package Remarks ATR0807-TCQ Pb-free SSO16 Taped and reeled ATR0807-PEQ Pb-free QFN16 (4 mm x 4 mm) Taped and reeled

4723CS–DVD–07/03

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