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Features
* * * * * * * * * * * * * *
Current-controlled Output Current Source, 3 Input Channels Low Power Consumption Output Current per Channel to 250 mA Total Output Current to 300 mA Rise Time 1.0 ns, Fall Time 1.1 ns On-chip RF Oscillator Control of Frequency and Swing by Use of 2 External Resistors Oscillator Frequency Range from 200 MHz to 500 MHz Oscillator Swing to 100 mA Fast Settling APC Amplifier Single 5 V Power Supply Common Enable, Disable Input TTL/CMOS Control Signals Small SSO16 Package
Applications
* CD-RW Drives * Writable Optical Drives
3-Channel Laser Driver with RF Oscillator and APC Amplifier T0815
Description
The T0815 is a laser diode driver for the operation of a grounded laser diode for CDRW 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 250 mA to the total output current of up to 300 mA. A total gain of 400 is provided between each reference current input and the 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 switchoff is achieved by a `low' at the ENABLE input. The T0815 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.
Rev. 4504B-DVD-06/02
1
Figure 1. Block Diagram
PDIN APC VREF VOUT
I3 NE3
Channel 3
I2 NE2 IR ENABLE
Channel 2 IOUT Read channel
ENOSC
RF oscillator
RF
RS
Pin Configuration
Figure 2. Pinning SSO16
VOUT VREF IR RF I2 I3 NE2 NE3
1 2 3 4
16 15 14 13
PDIN VCC1 IOUT GND RS ENABLE ENOSC VCC2
T0815
5 6 7 8 12 11 10 9
2
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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 VCC2 ENOSC ENABLE RS GND IOUT VCC1 PDIN Type analog analog analog analog analog analog digital digital supply digital digital analog supply analog supply analog Function APC amplifier output Reference voltage input Input current, bias voltage approximately GND External resistor to GND sets oscillator frequency Input current, bias voltage approximately GND Inp. current, bias voltage approximately GND Digital control of channel 2 (low active) Digital control of channel 3 (low active) + 5 V power supply for IOUT Enables RF oscillator (high active) Enables output current (high active) External resistor to GND sets oscillator swing Ground Output current source for laser diode + 5 V power supply for IOUT and circuit Photo diode input
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 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 0.7
(1)
Unit V V V V W C C
to 1
(2)
150 -65 to +125
Notes: 1. RthJA 115 K/W, Tamb = 70C 2. RthJA 115 K/W, Tamb = 25C
Thermal Resistance
Parameters Junction ambient Note: Symbol RthJA Value 115
(1)
Unit K/W
1. Measured with multi-layer test board (JEDEC standard)
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Operating Range
Parameters 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 <1 >3 >1 0 to +70 Unit V mA kW kW C
Electrical Characteristics: General
VCC = 5 V, Tamb =25C, ENABLE = High, NE2 = NE3 = High, ENOSC = Low, unless otherwise specified No. 1 1.1 1.2 Parameters 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 7, 8 7, 8 11 11 10 10 INELO INEHI IENLO IENHI IEOLO IEOHI -100 800 -150 100 -300 800 A A A A A A A A A A A A 7, 8 7, 8 11 11 10 10 VNELO VNEHI VENLO VENHI VEOLO VEOHI 3.0 3.0 0.5 2.0 0.5 1.3 V V V V V V A A A A A A ENABLE = Low, NE2 = NE3 = Low IIR = II2 = II3 = 125 A 9, 15 9, 15 ICCR1 IIR = II2 = II3 = 125 A, ENOSC = High, RS = 7.5 kW, RF = 7.5 kW IIR = II2 = II3 = 125 A, NE2 = NE3 = Low IIR = II2 = II3 = 0 A 9, 15 ICCR2 9, 15 9, 15 95 mA 90 mA A ICCPD 0.3 mA A A Test Conditions Pin Symbol Min. Typ. Max. Unit Type*
1.3
1.4 1.5 2 2.1 2.2 2.3 2.4 2.5 2.6 3 3.1 3.2 3.3 3.4 3.5 3.6
ICCW ICCoff
190 17
mA mA
A A
*) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
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Electrical Characteristics: Laser Amplifier
VCC = 5 V, Tamb = 25C, ENABLE = High, unless otherwise specified No. 4 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 Parameters Laser Amplifier Total output current Output current per channel IOUT series resistance Best fit current gain Best fit current offset Output current linearity IIN input impedance NE threshold Output off current 1 Output off current 2 Output is sourcing Output is sourcing Total ROUT to VCC rail Any channel Any channel
(1)
Test Conditions
Pin 14 14 14 14 14 14 3, 5, 6 7, 8 14 14
Symbol IOUT IOUT ROUT GAIN IOS ILIN RIN VTH IOFF1 IOFF2
Min. 300 250
Typ. 350
Max.
Unit mA mA
Type* A A A A A A A B A A
6 355 -8 -3 1200 2000 1.68 1 1 400 485 +4 +3 2500
W mA/mA mA % W V mA mA
Any channel (1)
(1)
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
4.11 4.12
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
14 14
IOFF3 VSER -4
5
mA
A A
1
%/V A
4.13
14 VSEW 14 14 TSER 14 TSEW -400 -400 ppm/C ppm/C INOO -6 0 %/V nA/ rt-Hz
4.14 4.15
3
C C
4.16
C
*) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter Note: 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 GAIN) + IOS
5
4504B-DVD-06/02
Electrical Characteristics: Laser Current Amplifier Outputs AC Performance
VCC = + 5 V, IOUT = 40 mA DC with 40 mA pulse, Tamb = 25C unless otherwise specified No. 5 5.1 5.2 5.3 5.4 Parameters Write rise time Write fall time Output current overshoot IOUT ON propagation delay IOUT OFF propagation delay Disable time Test Conditions 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% HighLow to IOUT at 50% of final value ENABLE 50% LowHigh to IOUT at 50% of final value IOUT = 50 mA, all channels, -3 dB value RF = 7.5 kW RF = 7.5 kW ENOSC 50% HighLow to IOUT at 50% of final value ENOSC 50% LowHigh to IOUT at 50% of final value Pin 14 14 14 14 tON 14 tOFF 14 tDIS 14 tEN 14 BWLCA 20 ns C 20 ns C 2 ns C 2 ns C Symbol Min. Typ. Max. Unit Type* C C C C Laser Current Amplifier Outputs AC Performance tRISE tFALL OS 1.0 1.1 5 2.0 2.0 ns ns %
5.5
5.6
5.7
Enable time
5.8 6 6.1 6.2 6.3
Amplifier bandwidth Oscillator Oscillator frequency Oscillator temperature coefficient Disable time oscillator
16
MHz
14 14 14
FOSC TCOSC TDISO
255
300 -150
350
MHz ppm/C
A C C
4
ns C
6.4
Enable time oscillator
14 TENO 2 ns
*) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter Note: 1. Load resistor at IOUT 6.8 W, measurement with 50 W oscilloscope and 39 W series resistor.
6
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Electrical Characteristics: APC Amplifier
VCC = 5 V, Tamb = 25C, RLOAD = 2 kW to VREF unless otherwise specified No. 7 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 Parameters APC Ampliifier Bandwidth Slew rate Setting time Open loop voltage gain Offset voltage Input bias current Common mode input range Input capacitance Output voltage swing RL = 2 kW to VREF G = 1, Cload = 22 pF G = 1, VOUT = 1 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 1 1 1 1 1 2 1 16 1 CMIR CIN VOUT 0.8 1.8 2 3.5 BWAPC SR ts Avol VOS -8 0.2 3.8 200 80 50 60 +5 MHz V/s ns dB mV A V pF V C C C C A A C D A Test Conditions Pin Symbol Min. Typ. Max. Unit Type*
*) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
7
4504B-DVD-06/02
Characteristic Curves
Figure 3. Oscillator Frequency vs. Resistor RF (RS = 7.5 kW)
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 ( kOhm )
Figure 4. Oscillator Swing vs. Resistor RS (RF = 7.5 kW)
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 ( kOhm )
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 )
8
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Figure 6. Transfer Characteristic of All Channels (gain = 444, load resistor at IOUT = 6.8 W)
400 350 300
IOUT ( mA )
250 200
VCC =5.35 V
150 100 50 0 0.0 200.0 400.0 600.0
VCC =5.0 V VCC =4.75 V
800.0
1000.0
IR ( mA )
Figure 7. Voltage Compliance R (IOUT to VCC) = 5.9 W
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
9
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Figure 8. Step Response, Read Channel: 50 mA, Channel 2: 50 mApp
Figure 9. Step Response, Read Channel: 50 mA, Channel 2: 250 mApp
10
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Figure 10. Timing Diagram of IOUT
ENABLE
NE2
NE3
t ON t EN t ON tr tr
t OFF t OFF t DIS tf tf
Figure 11. Application circuit
Cfb
Rfb VCC A n a l o g __ D i g i t a l VOUT VREF IR RF I2 I3 NE2 NE3 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 PDIN VCC1 IOUT GND RS ENABLE ENOSC VCC2 VCC LD PD
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Ordering Information
Extended Type Number T0815-TCQ Package SSO16 Remarks Taped and reeled
Package Information
12
T0815
4504B-DVD-06/02
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4504B-DVD-06/02 xM

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