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T0810
3-Channel Laser Driver with RF Osc. and APC Amplifier
Description
The T0810 is a laser diode driver for the operation of a grounded laser diode for CD-RW 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 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 at the IOUT Pin. Each channel can contribute up to 150 mA to the total output current of up to 200 mA. A total gain of 400 mA is provided between each reference current input and 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. Frequency and swing can be set by two external resistors. Oscillation is enabled by a `high' at the ENOSC Pin. Complete output current and oscillator switch-off is achieved by a `low' at the ENABLE input. The T0810 also includes a fast settling APC (Adaptive Power Control) transimpedance amplifier. It is provided to interface between the front end monitor photo diode and the ALPC (Adaptive Laser Diode Power Controller) circuit. Electrostatic sensitive device. Observe precautions for handling.
Features
D Current-controlled output current source with 3 input channels D Low-power consumption D Output current per channel to 150 mA D Total output current to 200 mA D Rise time 1.0 ns / fall time 1.1 ns D On-chip RF oscillator D Control of frequency and swing by use of 2 external resistors D Oscillator frequency range from 200MHz to 500 MHz D Oscillator swing to 100 mA D Fast settling APC amplifier D Single 5-V power supply D Common enable / disable input D TTL/CMOS control signals D Small SSO16 package
Application
D CD-RW drives D Writable optical drives
Block Diagram
PDIN APC VREF VOUT
I3 NE3
Channel 3
I2 NE2
Channel 2 IOUT
IR ENABLE
Read channel
ENOSC RF
RF oscillator
RS
Figure 1. Block diagram
Rev. A5, 08-Aug-01
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T0810
Ordering Information
Extended Type Number T0810-TCQ SSO16 Package Taped and reeled Remarks
Pin Description
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Symbol VOUT VREF IR RF I2 I3 NE2 NE3 VCC ENOSC Function APC amplifier output Reference voltage input Inp. current, bias voltage approx. GND External resistor to GND sets oscillator frequency Inp. current, bias voltage approx. GND Inp. current, bias voltage approx. GND Digital control of channel 2 (low active) Digital control of channel 3 (low active) + 5 V power supply Enables RF oscillator (high active)
VOUT VREF IR RF I2 I3 NE2 NE3
1 2 3 4
16 15 14 13
PDIN VCC IOUT GND RS ENABLE ENOSC VCC
T0810
5 6 7 8 12 11 10 9
Figure 2. Pinning SSO16
ENABLE Enables output current (high active) RS GND IOUT VCC PDIN External resistor to GND sets oscillator swing Ground Output current source for laser diode + 5 V power supply Photo diode input
Absolute Maximum Ratings
Parameter Supply voltage Input voltage at IR, I2, I3 Input voltage at NE2, NE3, ENOSC Output voltage Power dissipation Junction temperature Storage temperature range 1) RthJA 80 K/W Symbol VCC VIN1 VIN2 VOUT PMAX TJ TSTG Value -0.5 to +6.0 -0.5 to + 0.5 -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
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T0810
Thermal Resistance
Parameter Junction ambient Symbol RthJA Value 150 Unit K/W
Recommended Operating Conditions
Parameter Supply voltage range 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 RF RS Tamb Value 4.5 to 5.5 < 0.4 >3 > 100 0 to +70 Unit V mA k _C
Electrical Characteristics : General
VCC = 5 V, Tamb =25_C, ENABLE = High, NE2 = NE3 = High, ENOSC = Low, unless otherwise specified Parameter Power supply Supply current, power down Supply current, read mode, Oscillator disabled Supply current, read mode, Oscillator enabled Supply current, write mode Supply current, input off Digital inputs NE2/NE3 low voltage NE2/NE3 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 ENABLE low current ENABLE high current ENOSC low current ENOSC high current NE = 0 V NE = 5 V ENABLE = 0 V ENABLE = 5 V ENOSC = 0 V ENOSC = 5 V INELO INEHI IENLO IENHI IEOLO IEOHI -100 800 -150 100 -300 800 A A A A A A VNELO VNEHI VENLO VENHI VEOLO VEOHI 2.0 3.0 0.5 2.0 0.5 1.3 V V V V V V ENABLE = Low, NE2 = NE3 = Low IIR = II2 = II3 = 125 A IIR = II2 = II3 = 125 A, ENOSC = High, RS = 560 , RF = 6.8 k IIR = II2 = II3 = 125 A, NE2 = NE3 = Low IIR = II2 = II3 = 0 A ICCPD ICCR1 ICCR2 0.2 90 100 0.4 107 118 mA mA mA Test Conditions / Pins Symbol Min. Typ. Max. Unit
ICCW ICCoff
190 15
220 20
mA mA
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T0810
Electrical Characteristics : Laser Amplifier
VCC = 5 V, Tamb = 25_C, ENABLE = High, unless otherwise specified Parameter Best fit current gain Best fit current offset Output current linearity Input current range Output current per channel Total output current IOUT series resistance IIN input impedance NE threshold Output off current 1 Output off current 2 Output off current 3 IOUT supply sensitivity, read mode IOUT supply sensitivity, write mode IOUT current output noise IOUT temperature sensitivity, read mode IOUT temperature sensitivity, write mode
1)
Test Conditions / Pins Any channel Any channel
1) 1)
Symbol GAIN IOS ILIN IDAC IOUTR IOUT ROUT RIN VTH IOFF1 IOFF2 IOFF3 VSER VSEW INOO TSER TSEW
Min. -8 -3 0 150 200
Typ. 400
Max. +4 +3 0.4
Unit mA/mA mA % mA mA mA
Any channel 1) Input is sinking Output is sourcing IOUT = 180 mA total ROUT to VCC - Rail RIN is to GND Temperature stabilized ENABLE = Low NE2 = NE3 = High, IIR = 0, II2 = II3 = 125 A NE2 = NE3 = Low, IIR = II2 = II3 = 0 A IOUT = 40 mA, VCC = 5 V 10%, read only 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
8 1200 2000 1.68 0.5 0.7 5 -4 -6 3 100 100 1 0 2500
V mA mA mA %/V %/V nA/rt-Hz ppm/C ppm/C
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 GAIN) + IOS
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T0810
Electrical Characteristics : Laser Current Amplifier Outputs AC Performance
VCC = + 5 V, IOUT = 40 mA DC with 40 mA pulse, TA = 25C unless otherwise specified Parameter Write rise time Write fall time Output current overshoot IOUT ON propagation delay IOFF OFF propagation delay Disable time Enable time Amplifier bandwidth Oscillator Oscillator frequency Osc. temperature coefficient Disable time oscillator Enable time oscillator
1)
Test Conditions / Pins IOUT = 40 mA (read) + 40 mA (10% to 90%) 1) IOUT = 40 mA (read) + 40 mA (10% to 90%) 1) 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 IOUT = 50 mA, all channels, -3dB value RF = 4.3 k RF = 4.3 k ENOSC 50% High-Low to IOUT at 50% of final value ENOSC 50% Low-High to IOUT at 50% of final value
Symbol tRISE tFALL OS tON tOFF tDIS tEN BWLCA
Min.
Typ. 1.0 1.4 5 2.0 2.0 10 50 16
Max. 3.0 3.0
Unit ns ns % ns ns ns ns MHz
FOSC TCOSC TDISO TENO
380
470 -150 4 2
560
MHz ppm/C ns ns
Load resistor at IOUT: 10 // 39 + 50 (see test circuit)
Electrical Characteristics : APC Amplifier
VCC = 5 V, TA = 25C, RLOAD = 2 k to VREF unless otherwise specified Parameter Bandwidth Slew rate Setting time Open loop voltage gain Offset voltage Input bias current Common mode input range Common mode rejection ratio Input impedance Input capacitance Output voltage swing Pin 16 (PDIN) RL = 2 k to VREF Test Conditions / Pins G = 1, Cload = 22 pF G = 1, VOUT = 1 V to 3 V To 0.1%, VOUT = 1 V to 3 V VOUT = 1 V to 3 V VREF = 3 V VREF = 3 V CMRR > = 54 dB VCM = 0.5 V to 3.0 V CMIR CMRR RIN CIN VOUT 1 1 60 20 2 VCC-1.5 Symbol BWAPC SR ts Avol VOS -5 -1.5 VCC-1.5 Min. Typ. 200 80 50 60 +5 Max. Unit MHz V/s ns dB mV A V dB k pF V
Rev. A5, 08-Aug-01
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T0810
Application Information Oscillator
550 500 450 400 350 300 250 200 4 5 6 7 RF ( kW ) 8 9 10 0 200 Swing / mA ( pk/pk ) 40 30 20 10 Frequency ( MHz ) 50
250
300
350
400
450
500
Frequency ( MHz )
Figure 3. Frequency vs. resistor RF (RS = 680 )
100 80 60 40 20 0 200
Figure 5. Frequency dependency of swing (RS = 680 )
Swing / mA ( pk/pk )
400
600
800
1000
1200
1400
RS ( W )
Figure 4. Swing vs. resistor RS (RF = 6.8 k)
Test Circuit
Iout 39
50 (oscilloscope) 10
Figure 6. Test circuit for measurement of write rise and fall time
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T0810
Timing Diagram
ENABLE NE2 NE3 tON tON IOUT tEN tr tr Figure 7. Timing diagram tf tf tOFF tOFF tDIS
Typical Application Circuit
Cfb Rfb VCC 1 VOUT 2 VREF 3 IR Analog RF 4 RF 5 I2 6 I3 7 NE2 8 NE3 Digital PDIN 16 VCC 15 IOUT 14 GND 13 RS 12 ENABLE 11 ENOSC 10 VCC 9 VCC LD RS PD
Figure 8. Application circuit
Rev. A5, 08-Aug-01
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T0810
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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Rev. A5, 08-Aug-01
T0810
Ozone Depleting Substances Policy Statement
It is the policy of Atmel Germany GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances (ODSs). The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. Atmel Germany GmbH has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency (EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively. Atmel Germany GmbH can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances.
We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use Atmel Wireless & Microcontrollers products for any unintended or unauthorized application, the buyer shall indemnify Atmel Wireless & Microcontrollers against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. Data sheets can also be retrieved from the Internet: http://www.atmel-wm.com
Atmel Germany GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2594, Fax number: 49 (0)7131 67 2423
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