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Features
* * * * * * * * * * * *
Current-controlled Output Current Source, 3 Input Channels Two Selectable Outputs for Grounded Laser Diodes Output Current per Channel up to 250 mA Total Output Current to 300 mA (Minimum) On-chip RF Oscillator Control of 2 Different Swings by Use of 2 external Resistors Oscillator Frequency Range from 100 MHz to 600 MHz Oscillator Swing to 100 mA Single 5 V Power Supply Common Enable/Disable Input TTL/CMOS Control Signals Small SSO16 Package
Applications
* DVD-ROM with CD-RW Capability (Combo Drives)
3-Channel Laser Driver with RF Oscillator and 2 Outputs T0806 Preliminary
Description
The T0806 is a laser diode driver for the operation of two different grounded laser diodes for DVD-RAM (650 nm) and CD-RW (780 nm) drives. It includes three channels for three different optical power levels which are controlled by a separate IC. The read channel generates a continuous output level whereas 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 outputs IOUTA or IOUTB by the select input SELA. Each channel can contribute up to 250 mA to the total output current of up to 300 mA. A total gain of 100 is 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 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.
Rev. 4522A-DVD-02/02
1
Figure 1. Block Diagram
I3 NE3
Channel 3
IOUTA IOUTB
I2 NE2
Channel 2
IR ENABLE
Read channel
ENOSC
RF oscillator
RF
RSA RSB
SELA
Pin Configuration
Figure 2. Pinning SSO16
IR I2 I3 RF NE2 NE3 ENABLE ENOSC
1 2 3 4
16 15 14 13
VCC IOUTA GND RSA RSB IOUTB SELA VCC
T0806
5 6 7 8 12 11 10 9
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Pin Description
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Symbol IR I2 I3 RF NE2 NE3 ENABLE ENOSC VCC SELA IOUTB RSB RSA GND IOUTA VCC IR I2 I3 RF NE2 NE3 ENABLE ENOSC VCC SELA IOUTB RSB RSA GND IOUTA VCC Type analog analog analog analog digital digital digital digital supply digital analog analog analog supply analog supply analog analog analog analog digital digital digital digital supply digital analog analog analog supply analog supply Function Input current, bias voltage approximately GND Input current, bias voltage approximately GND Input current, bias voltage approximately GND External resistor to GND sets oscillator frequency of oscillator A Digital control of channel 2 (low active) Digital control of channel 3 (low active) Enables output current (high active) Enables RF oscillator (high active) + 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 + 5 V power supply Input current, bias voltage approximately GND Input current, bias voltage approximately GND Input current, bias voltage approximately GND External resistor to GND sets oscillator frequency of oscillator A Digital control of channel 2 (low active) Digital control of channel 3 (low active) Enables output current (high active) Enables RF oscillator (high active) + 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 + 5 V power supply
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Absolute Maximum Ratings
Parameters Supply voltage Input voltage at IR, I2, I3 Input voltage at NE2, NE3, ENOSC Output voltage Power dissipation Junction temperature Storage temperature range Note: 1. RthJA < 80 K/W Symbol VCC VIN1 VIN2 VOUT PMAX TJ TSTG Value -0.5 to +6.0 -0.5 to +2.0 -0.5 to VCC +0.5 -0.5 to VCC -1 1
(1)
Unit V V V V W C C
150 -65 to +125
Thermal Resistance
Parameters Junction ambient Symbol RthJA Value 135 Unit K/W
Recommended Operating Conditions
Parameters Supply voltage range Input current External to GND to set oscillator frequency External to GND to set oscillator swing Operating temperature range Symbol VCC IIR/II2/II3 RFA, RFB RSA, ESB Tamb Value 4.5 to 5.5 < 2.5 >3 >1 0 to +70 Unit V mA k k C
Electrical Characteristics: General
VCC = 5 V, Tamb = 25C, ENABLE = High, NE2 = NE3 = High, ENOSC = Low, unless otherwise specified.
Parameters Power Supply Supply current, power down Supply current, read mode, oscillator disabled Supply current, read mode, oscillator enabled, output A, selected Supply current, write mode Supply current, input off VCC shutdown voltage ENABLE = Low, NE2 = NE3 = Low IIR = II2 = II3 = 500 A IIR = II2 = II3 = 500 A, ENOSC = High, RS = 8.2 k, RF = 6.8 k, SELA = High IIR = II2 = II3 = 500 A, NE2 = NE3 = Low IIR = II2 = II3 = 0 A ICCPD2 ICCR1 ICCR2 0.3 90 93 mA mA mA Test Conditions / Pins Symbol Min. Typ. Max. Unit
ICCW ICCoff VSHUT
180 17 2.4
mA mA V
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Electrical Characteristics: General (Continued)
VCC = 5 V, Tamb = 25C, ENABLE = High, NE2 = NE3 = High, ENOSC = Low, unless otherwise specified.
Parameters Digital Inputs NE2/NE3 low voltage NE2/NE3 high voltage SELA low voltage SELA high voltage ENABLE low voltage ENABLE high voltage ENOSC low voltage ENOSC high voltage Current at Digital Inputs NE2/NE3 low current NE2/NE3 high current SELA low current SELA high current ENABLE low current ENABLE high current ENOSC low current ENOSC high current NE = 0 V NE = 5 V SELA = 0 V SELA = 5 V ENABLE = 0 V ENABLE = 5 V ENOSC = 0 V ENOSC = 5 V INELO INEHI ISELALO ISELAHI IENLO IENHI IEOLO IEOHI -100 800 -150 100 -50 150 -300 800 A A A A A A A A VNELO VNEHI VSELALO VSELAHI VENLO VENHI VEOLO VEOHI 3.0 2.7 0.5 3.0 0.5 2.0 0.5 1.3 V V V V V V V V Test Conditions / Pins Symbol Min. Typ. Max. Unit
Electrical Characteristics: Laser Amplifier
VCC = 5 V, Tamb = 25C, ENABLE = High, unless otherwise specified.
Parameters Outputs IOUTA and IOUTB Total output current Output current per channel Best fit current gain Best fit current offset Output current linearity Input current range IIN input impedance NE threshold Output off current 1 Output off current 2 Output off current 3 IOUT supply sensitivity, read mode Note: Output is sourcing Output is sourcing Any channel (1) Any channel Any channel
(1) (1)
Test Conditions / Pins
Symbol IOUT IOUTR GAIN IOS ILIN IDAC RIN VTH IOFF1 IOFF2 IOFF3 VSER
Min. 300 250
Typ. 350 100
Max.
Unit mA mA mA/mA
-8 -3 0 150 200 1.68
+4 +3 2 250 1 1 5
mA % mA V mA mA mA %/V
Input is sinking RIN is to GND Temperature stabilized ENABLE = Low NE2 = NE3 = High, IIR =0 A, II2 = II3 = 500 A NE2 = NE3 = Low, IIR = II2 = II3 = 0 A IOUT = 40 mA, VCC = 5 V 10%, read only
-4
1
1. Linearity of the amplifier is calculated using a best fit method at three operating points of IOUT at 20 mA, 40 mA, and 60 mA. IOUT = (IIN x GAIN) + IOS
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Electrical Characteristics: Laser Amplifier (Continued)
VCC = 5 V, Tamb = 25C, ENABLE = High, unless otherwise specified.
Parameters IOUT supply sensitivity, write mode IOUT current output noise IOUT temperature sensitivity, read mode IOUT temperature sensitivity, write mode Note: Test Conditions / Pins IOUT = 80 mA, 40 mA read + 40 mA write, VCC = 5 V 10% IOUT = 40 mA, ENOSC = Low IOUT = 40 mA, read only IOUT = 80 mA, 40 mA read + 40 mA write Symbol VSEW INOO TSER TSEW Min. -6 3 100 100 Typ. Max. 0 Unit %/V nA/rt-Hz ppm/C ppm/C
1. Linearity of the amplifier is calculated using a best fit method at three operating points of IOUT at 20 mA, 40 mA, and 60 mA. IOUT = (IIN x GAIN) + IOS
Electrical Characteristics: Laser Current Amplifier Outouts AC Performance
VCC = + 5 V, IOUT = 40 mA DC with 40 mA pulse, TA = 25C unless otherwise specified.
Parameters Output IOUTA and IOUTB Write rise time Write fall time Output current overshoot IOUT ON propagation delay IOFF OFF propagation delay Disable time Enable time Disable time Enable time SELA delay SELA delay Amplifier bandwidth Oscillator Oscillator frequency Oscillator temperature coefficient Disable time oscillator Enable time oscillator Note: RF = 7.5 k RF = 7.5 k ENOSC 50% High-Low to IOUT at 50% of final value ENOSC 50% Low-High to IOUT at 50% of final value FOSC TCOSC TDISO TENO 255 300 -150 4 2 350 MHz ppm/C ns ns IOUT = 40 mA (read) + 40 mA (10% to 90%) (1) IOUT = 40 mA (read) + 40 mA (10% to 90%) IOUT = 40 mA (read) + 40 mA (1) NE 50% High-Low to IOUT at 50% of final value NE 50% Low-High to IOUT at 50% of final value ENABLE 50% High-Low to IOUT at 50% of final value ENABLE 50% Low-High to IOUT at 50% of final value ENOSC 50% High-Low to IOUT at 50% of final value ENOSC 50% Low-High to IOUT at 50% of final value SELA 50% Low-High to IOUT at 50% of final value SELA 50% High-Low to IOUT at 50% of final value IOUT = 50 mA, all channels, -3 dB value
(1)
Test Conditions / Pins
Symbol tRISE tFALL OS tON tOFF tDIS tEN TDISO TtENO TSAH TSAL BWLCA
Min.
Typ. 1.0 1.1 5 2 2 20 20 3 20
Max. 2.0 2.0
Unit ns ns % ns ns ns ns ns ns
16
MHz
1. Load resistor at IOUT 6.8 , measurement with 50- oscilloscope and 39- series resistor.
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Characteristics Curves
Figure 3. Oscillator Frequency vs. Resistor RF (RS = 7.5 k)
550 500
Frequency (MHz)
450 400 350 300 250 200 4,0 5,0 6,0 7,0 8,0 9,0 10,0
RF (k )
Figure 4. Oscillator Swing vs. Resistor RS (RF = 7.5 k)
120
100
Swing / mA (pk/pk)
80
60
40
20
0 2,0 3,0 4,0 5,0 6,0 7,0 8,0 9,0 10,0
RS (k )
Figure 5. Oscillator Frequency Dependency of Swing
60
50
Swing / mA (pk/pk)
40
30
20
10
0 200,0 250,0 300,0 350,0 400,0 450,0 500,0
Frequency (MHz)
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Figure 6. Transfer Characteristic of all Channels (Gain = 444)
400 350 300
IOUT (mA)
250 200 150 100 50 0 0,0 200,0 400,0 600,0 800,0 1000,0 - VCC = 5.25 V - VCC = 5.0 V - VCC = 4.75 V
IR ( A)
Figure 7. Voltage Compliance R (IOUT to VCC)= 5.9
350 300 250
IOUT (mA)
200 150 100 50 0 0.0 1.0 2.0 3.0 4.0 5.0
VCC-V (IOUT) /V
Figure 8. Step Response, Read Channel: 50 mA, Channel 2: 50 mApp
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Figure 9. Step Response, Read Channel: 50 mA, Channel 2: 250 mApp
Timing Diagram
Figure 10. Timing Diagram of IOUTA/IOUTB
t ON t ON t EN tr tr
t OFF t OFF t DIS tf tf
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Typical Application Circuit
Figure 11. Application Circuit
A n a l o g IR I2 I3 RF NE2 D i g i t a l NE3 ENABLE ENOSC 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC IOUTA GND RSA RSB IOUTB SELA VCC LD LD VCC
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Ordering Information
Extended Type Number T0806-TCQ Package SSO16 Remarks Taped and reeled
Package Information
Package SSO16
Dimensions in mm
5.00 max 5.00 4.80 1.40 0.2 0.25 0.635 4.45 16 9 0.25 0.10 3.95 max 5.2 4.8 6.2 5.8
technical drawings according to DIN specifications
1
8
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4522A-DVD-02/02 xM

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