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Features
* * * * * * * * * * * *
Current-controlled Output Current Source with 4 Input Channels Two Selectable Outputs for Grounded Laser Diodes Up to 350 mA Output Current per Channel Total Output Current up to 500 mA On-chip RF Oscillator Oscillator Frequency Range from 200 MHz to 500 MHz Individual Setting of RF Oscillator Current on Each Output by External Resistors Maximum Oscillator Current Amplitude 100 mA Single 5 V Power Supply Common Enable/Disable Input TTL/CMOS Compatible Control Signals Small Pb-free QFN20 or SSO20 Package
Applications
* * * *
DVD-ROM with CD-RW Capability DVD+RW with CD-RW Capability DVD-RW with CD-RW Capability Magneto-optical Drives and Others
Four Channel Laser Driver with RF Oscillator and Two Outputs ATR0809
Description
ATR0809 is a laser diode driver for the operation of two different grounded laser diodes for DVD-RW/+RW (650 nm) and CD-RW (780 nm). It includes four channels for four different optical power levels. All channels (channel 1 = read channel, channel 2, 3, 4 = write channels) can be controlled by fast switches. The 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 write channel (channel 2, 3 and 4) can contribute up to 350 mA to the total output current of up to 500 mA. The read channel can contribute up to 150 mA. Total gains of 100 (read channel), 250 (channel 2 and 3) and 100 (channel 4) are provided between each reference current input and the selected output. Although the reference inputs are current inputs, voltage control is also possible by using external resistors. An on-chip RF oscillator can be used to reduce laser mode hopping noise in read mode. The oscillator current amplitude and frequency can be set independently for the two selectable outputs with four 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.
Summary
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Figure 1. Block Diagram
I4 NE4 I3 NE3 I2 NE2
Channel 4
Channel 3 IOUTA IOUTB Channel 2
IR NER ENABLE
Channel 1 Read channel
ENOSC
RF oscillator
RFA RSA RFB RSB
SELA
2
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ATR0809
Pin Configuration SSO20
Figure 2. Pinning SSO20
IR I2 I3 I4 RFA RFB NER NE2 NE3 NE4 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VCC ENABLE IOUTA GND RSA RSB IOUTB SELA VCC ENOSC
Pin Description
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Symbol IR I2 I3 I4 RFA RFB NER NE2 NE3 NE4 ENOSC VCC SELA IOUTB RSB RSA GND IOUTA ENABLE VCC Type Analog Analog Analog Analog Analog Analog Digital Digital Digital Digital Digital Supply Digital Analog Analog Analog Supply Analog Digital Supply Function Input current, bias voltage approximately GND Input current, bias voltage approximately GND Input current, bias voltage approximately GND Input current, bias voltage approximately GND External resistor to GND sets frequency of oscillator A External resistor to GND sets frequency of oscillator B Digital control of channel 1 (read, active low) Digital control of channel 2 (active low) Digital control of channel 3 (active low) Digital control of channel 4 (active low) Enables RF oscillator (active high) 5 V power supply High: selects IOUTA, RSA, RFA Low: selects IOUTB, RSB, RFB 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 Enables output current (active high) 5 V power supply
3
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Pin Configuration QFN20
Figure 3. Pinning QFN20
I3 I2 IR VCC ENABLE 10 9 8 7 6 I4 RFA RFB NER NE2 11 12 13 14 15 16 17 18 19 20 NE3 NE4 ENOSC VCC SELA 5 4 3 2 1 IOUTA GND RSA RSB IOUTB
Pin Description
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Symbol I4 RFA RFB NER NE2 NE3 NE4 ENOSC VCC SELA IOUTB RSB RSA GND IOUTA ENABLE VCC IR I2 I3 Type Analog Analog Analog Digital Digital Digital Digital Digital Supply Digital Analog Analog Analog Supply Analog Digital Supply Analog Analog Analog Function Input current, bias voltage approximately GND External resistor to GND sets frequency of oscillator A External resistor to GND sets frequency of oscillator B Digital control of channel 1 (read, active low) Digital control of channel 2 (active low) Digital control of channel 3 (active low) Digital control of channel 4 (active low) Enables RF oscillator (active high) 5 V power supply 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 Enables output current (active high) 5 V power supply Input current, bias voltage approximately GND Input current, bias voltage approximately GND Input current, bias voltage approximately GND
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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 Power dissipation Output voltage Junction temperature Storage temperature Notes: 1. RthJA 115 K/W at Tamb = 70C 2. RthJA 115 K/W at Tamb = 25C Symbol VCC Vin Pmax Vout Tj Tstg Value -0.5 to +6.0 -0.5 to VCC +0.5 0.7
(1)
Unit V V W V C C
to 1
(2)
-0.5 to VCC -1 150 -65 to +125
Thermal Resistance
Parameters Junction case Junction ambient Note: Symbol RthJC RthJA Value 27 125
(1)
Unit K/W K/W
1. Measured with multi-layer test board (JEDEC standard)
Recommended Operating Conditions
Parameters Supply voltage 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, II4 RFA, RFB RSA, RSB Tamb Value 4.5 to 5.5 < 2.5 >3 > 1000 0 to +70 Unit V mA k k C
5
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Ordering Information
Extended Type Number ATR0809-TKQG ATR0809-PRQG Package SSO20 QFN20 Remarks Pb-free Pb-free, 4 mm x 4 mm
Package Information
Package SSO20
Dimensions in mm
6.75 6.50 5.7 5.3 4.5 4.3
1.30 0.25 0.65 5.85 20 11 0.15 0.05 0.15 6.6 6.3
technical drawings according to DIN specifications
1
10
6
ATR0809
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