1
Features
•Current-controlled Output Current Source with 5 Input Channels
•2 Selectable Outputs for Grounded Laser Diodes
•Output Current per Channel up to 200 mA
•Total Output Current up to 250 mA
•Rise Time 1.0 ns / Fall Time 1.1 ns
•On-chip RF Oscillator
•Control of 2 Different Frequencies and Swings by Use of 4 External Resistors
•Oscillator Frequency Range from 200 MHz to 600 MHz
•Oscillator Swing to 100 mA
•Single 5-V Power Supply
•Common Enable/Disable Input
•TTL/CMOS Control Signals
•Small SSO24 Package and HP-VFQFP-N28 Package
Applications
•Combo Drives (DVD + CD-RW)
•DVD-RAM with CD-RW Capability
•DVD-RW with CD-RW Capability
Description
The T0 800 is a la ser diod e driver for the ope ration of two different, grou nded las er
diodes for DVD-RAM (650 nm) and CD-RW (780 nm). It includes five channels for five
different op tical power levels which are co ntrol led by a separate IC. The read chan nel
generates a c ontinuou s ou tput l evel. The chan nels 2 to 5 are provided as wr ite c han-
nels with ve ry fast switchin g speeds. When a ‘low’ signal is applied to the NE pins,
write current pulses are enabled. All channels are summed together and switched to
one of the two outp uts IOUTA or IOUTB by the selec t input S ELA. Eac h channe l can
contribute up to 200 mA to the total output current of up to 250 mA. A total gain of 100
is provided between each reference current input and the selected output. Although
the reference inputs are c urrent inpu ts, voltage control is possible by using external
resistors. An on-chip RF oscil lator reduces laser mode hopping noi se during read
mode. Frequency and swing can be set independently for the two selectable outputs
with two pairs of resistors. Oscillation is enabled by a ‘high’ signal at the ENOSC pin.
Complete output cur rent and oscil lator sw itch-off is ach ieved by a ‘low’ signal at the
ENABLE inp ut.
5-Channel Laser
Driver with RF
Oscillator an d
2Outputs
T0800
Preliminary
Rev. 4503C–DVD–12/02
2T0800 4503C–DVD–12/02
Pin Configuration
Figure 1. Pinning SSO24
IR
I2
I3
I4
I5
RFA
RFB
NE2
NE3
NE4
NE5
ENABLE
VCC1
VCC2
IOUTA
IOUTA
GND
RSA
RSB
IOUTB
IOUTB
SELA
ENOSC
VCC2
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
Pin Description: SSO24
Pin Symbol Type Function
1 IR Analog Input current, bias vo ltage approximately GND
2 I2 Analog Input current, bias vo ltage approximately GND
3 I3 Analog Input current, bias vo ltage approximately GND
4 I4 Analog Input current, bias vo ltage approximately GND
5 I5 Analog Input current, bias vo ltage approximately GND
6 RFA Analog External resistor to GND sets frequency of oscillator A
7 RFB Analog External resistor to GND sets frequency of oscillator B
8 NE2 Digital Digital control of channel 2 (low active)
9 NE3 Digital Digital control of channel 3 (low active)
10 NE4 Digital Digital control of channel 4 (low active)
11 NE5 Digital Digital control of channel 5 (low active)
12 ENABLE Digital Enables output current (high active)
13 VCC2 Supply +5 V powe r supp ly for IOUT
14 ENOSC Digital Enables RF oscillator (high active)
15 SELA Digital High: selects IOUTA, RFA, RSA
Low: selects IOUTB, RFB, RSB
16/17 IOUTB Analog Output current source B for laser diode
18 RSB Analog External resistor to GND sets swing of oscillator B
19 RSA Analog External resistor to GND sets swing of oscillator A
20 GND Supply Ground
21/22 IOUTA Analog Output current source A for laser diode
23 VCC2 Supply +5 V powe r supp ly for IOUT
24 VCC1 Supply +5 V powe r supp ly for circuit
3
T0800
4503C–DVD–12/02
Figure 2. Pinning HP-VFQFP-N28
I4
I5
RFA
RFB
GND
NE2
NE3
IOUTA
IOUTA
GND
RSA
RSB
IOUTB
IOUTB
I3
I2
IR
nc
VCC1
VCC2
VCC2
NE4
NE5
ENABLE
VCC2
VCC2
ENOSC
SELA
28 27 26 25 24 23 22
8 9 10 11 12 13 14
1
2
3
4
5
6
7
21
20
19
18
17
16
15
Pin Description: HP-VFQFP-N28
Pin Symbol Type Function
1 I4 Analog Input current, bias vo ltage approximately GND
2 I5 Analog Input current, bias vo ltage approximately GND
3 RFA Analog External resistor to GND sets frequency of oscillator A
4 RFB Analog External resistor to GND sets frequency of oscillator B
5 GND Supply Ground
6 NE2 Digital Digital control of channel 2 (low active)
7 NE3 Digital Digital control of channel 3 (low active)
8 NE4 Digital Digital control of channel 4 (low active)
9 NE5 Digital Digital control of channel 5 (low active)
10 ENABLE Digital Enables output current (high active)
11, 12 VCC2 Supply +5 V power supply IOUT
13 ENOSC Digital Enables RF oscillator (high active)
14 SELA Digital High: selects IOUTA, RFA, RSA
Low: selects IOUTB, RFB, RSB
15 IOUTB Analog Output current source B for laser diode
16 IOUTB Analog Output current source B for laser diode
17 RSB Analog External resistor to GND sets swing of oscillator B
18 RSA Analog External resistor to GND sets swing of oscillator A
19 GND Supply Ground
20 IOUTA Analog Output current source A for laser diode
21 IOUTA Analog Output current source A for laser diode
22, 23 VCC2 Supply +5 V power supply IOUT
24 VCC1 Supply +5 V power supply circuit
25 nc – Not connected
26 IR Analog Input current, bias voltage approximately GND
27 I2 Analog Input current, bias voltage approximately GND
28 I3 Analog Input current, bias voltage approximately GND
Paddle – – Should be conneced with ground
4T0800 4503C–DVD–12/02
Figure 3. Block Diagram
Channel 3
Channel 2
I3
NE3
I2
NE2
Read channel
RF oscillator
IR
ENOSC
ENABLE
RFA RSA
Channel 4
Channel 5
I4
NE4
NE5
I5
IOUTA
IOUTB
RFB RSB SELA
5
T0800
4503C–DVD–12/02
Absolute Maxim u m Ratings
Parameter Symbol Value Unit
Supply voltage VCC -0.5 to +6.0 V
Input voltage at IR, I2, I3, I4, I5 VIN1 -0.5 to + 0.5 V
Input voltage at NE2, NE3, NE4, NE5, ENOSC VIN2 -0.5 to VCC + 0.5 V
Output voltage VOUT -0.5 to VCC –1 V
Power dissipation Ptot 0.7 (1) to 1 (2) W
Junction temperature TJ150 °C
Storage t emperatu re range Tstg -6 5 to +125 °C
Notes: 1. RthJA ≤ 115 K/W, Tamb = 70°C
2. RthJA ≤ 115 K/W, Tamb = 25°C
Thermal Resistance
Parameter Symbol Value (1) Unit
Junction ambient RthJA 115 (SSO24)
35 (HP-VFQFP-N28) K/W
K/W
Note: 1. Measured with multi-layer test board (JEDEC standard JESD51-7)
Recommended Operating Conditions
Parameter Symbol Value Unit
Supply voltage range VCC 4.5 to 5.5 V
Input current IIR, II2, II3, II4, II5 < 2.5 mA
External resistor to GND to set oscillator
frequency RFA, RFB > 3 kW
External resistor to GND to set oscillator swing RSA, RSB > 100 W
Operating temperature range Tamb 0 to +70 °C
6T0800 4503C–DVD–12/02
Electrical Characteristics
VCC = 5 V, Tamb = 25°C, ENABLE = High, NE2 = NE3 = NE4 = NE5 = High, ENOSC = Low, unless otherwise specified
No. Parameters Test Conditions Pin (1) Symbol Min. Typ. Max. Unit Type*
1 Power Supply
1.1 Supply current, power
down ENABLE = Low,
NE2 = NE3 = NE4 =
NE5 = Low
11,12,
22, 23, 24 ICCPD2 0.5 mA A
1.2 Supply current, read
mode, oscillator
disabled
IIR = II2 = II3 = II4 = II5 =
500 µA 11,12,
22, 23, 24 ICCR1 115 mA A
1.3
Supply current, read
mode, oscillator
enab l ed, output A
selected
IIR = II2 = II3 = II4 = II5 =
500 µA,
ENOSC = High,
RS = 560 W,
RF = 7.5 kW,
SELA = High
11,12,
22, 23, 24 ICCR2 120 mA A
1.4
Supply current, write
mode IIR = II2 = II3 = II4 = II5 =
500 µA,
NE2 = NE3 = NE4 =
NE5 = Low
11,12,
22, 23, 24 ICCW320 mA A
1.5 Supply current, input
off IIR = II2 = II3 = II4 = II5 =
0 µA 11,12,
22, 23, 24 ICCoff 18 mA A
2 Digital Inputs
2.1 NE2/NE3/NE4/NE5
low voltage 6, 7, 8, 9 VNELO 1.1 V A
2.2 NE2/NE3/NE4/NE5
high voltage 6, 7, 8, 9 VNEHI 2.0 V A
2.3 SELA low voltage 14 VSELALO 0.5 V A
2.4 SELA high voltage 14 VSELAHI 2.0 V A
2.5 ENABLE low voltage 10 VENLO 0.5 V A
2.6 ENABLE high voltage 10 VENHI 2.0 V A
2.7 ENOSC low voltage 13 VEOLO 0.5 V A
2.8 ENOSC high vo ltage 13 VEOHI 2.0 V A
3 Currents at Digital Inputs
3.1 NE2/NE3/NE4/NE5
low current NE = 0 V 6, 7, 8, 9 INELO -300 µA A
3.2 NE2/NE3/NE4/NE5
high current NE = 5 V 6, 7, 8, 9 INEHI 800 µA A
3.3 SELA low current SELA = 0 V 14 ISELALO -45 µA A
3.4 SELA high current SELA = 5 V 14 ISELAHI 150 µA A
3.5 ENABLE low current ENABLE = 0 V 10 IENLO -150 µA A
3.6 ENABLE high current ENABLE = 5 V 10 IENHI 100 µA A
3.7 ENOSC low current ENOSC = 0 V 13 IEOLO -100 µA A
3.8 ENOSC high current ENOSC = 5 V 13 IEOHI 800 µA A
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Note: 1. Related to HP-VFQFP-N28 Package
7
T0800
4503C–DVD–12/02
Electrical Characteristics: Laser Amplifier
VCC = 5 V, Tamb = 25°C , ENABLE = High, unless otherwise specified
No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type*
4 Outputs IOUTA and IOUTB
4.1 Best fit cur rent gai n Any chann el (1) 15, 16,
20, 21 GAIN 90 100 130 mA/mA A
4.2 Best fit cur rent offs et Any chann el (1) 15, 16,
20, 21 IOS -8 +4 mA A
4.3 Output current
linearity Any channel (1) 15, 16,
20, 21 ILIN -3 +3 % A
4.5 Output current per
channel Output is sou rcing 15, 16,
20, 21 IOUTR 200 mA A
4.6 Total output current 15, 16,
20, 21 IOUT 250 mA A
4.7 IIN input im pedance RIN is to GND 1, 2, 26,
27, 28 RIN 170 220 270 WA
4.8 NE thresho ld Temperature
stabilized 6, 7, 8,
9VTH 1.68 V C
4.9 Output off current 1 ENABLE = Low 15, 16,
20, 21 IOFF11mAA
4.10 Output off current 2 NE2 = NE3 = NE4 =
NE5 = High 15, 16,
20, 21 IOFF21mAA
4.11
Output off current 3 NE2 = NE3 = NE4 =
NE5 = Low,
IIR = II2 = II3 = II4 = II5 =
0 µA
15, 16,
20, 21 IOFF35mAA
4.12 IOUT supply sensitivity ,
read mode IOUT = 40 mA,
VCC = 5 V ±10%,
read-only
15, 16,
20, 21 VSER-5 1 %V A
4.13 IOUT supply sensitivity ,
write mode IOUT = 80 mA, 40 mA
read + 40 mA write,
VCC = 5 V ±10%
15, 16,
20, 21 VSEW-6 0 %V A
4.14 IOUT current output
noise IOUT = 40 mA,
ENOSC = Low 15, 16,
20, 21 INOO3nA/
rt-Hz C
4.15 IOUT temperature
sensi tiv ity, read mode IOUT = 40 mA, read
only 15, 16,
20, 21 TSER-100 ppm/°C C
4.16 IOUT temperature
sensi t iv ity, write mode IOUT = 80 mA, 40 mA
read + 40 mA write 15, 16,
20, 21 TSEW-300 ppm/°C C
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Note: 1. Linearity of the amplifie r is calculated using a best fit method at three operating points of I OUT at 20 mA , 40 mA, and 60
mA, IOUT = (IIN ´ GAIN) + IOS
8T0800 4503C–DVD–12/02
Electrical Characteristics
VCC = 5 V, IOUT = 40 mA DC with 40-mA pulse, Tamb = 25°C, unless otherwise specified
No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type*
5 Outputs IOUTA and IOUTB, AC Performance
5.1 Write rise time IOUT = 40 mA (read)
+40 mA (10%-90%) (1) 15, 16,
20, 21 tRISE 1.0 3.0 ns C
5.2 Write fall time IOUT = 40 mA (read)
+40 mA (10%-90%) (1) 15, 16,
20, 21 tFALL 1.1 3.0 ns C
5.3 Output current
overshoot IOUT = 40 mA (read) + 40
mA (1) 15, 16,
20, 21 OS 5 % C
5.4 IOUT ON prop delay NE 50% High-Low to
IOUT at 50% of final value 15, 16,
20, 21 tON 2.0 ns C
5.5 IOFF OFF prop
delay NE 50% Low-High to
IOUT at 50% of final value 15, 16,
20, 21 tOFF 2.0 ns C
5.6 Disable time ENABLE 50% High-Low
to IOUT at 50% of final
value
15, 16,
20, 21 tDIS 20 ns C
5.7 Enable time ENABLE 50% Low-High
to IOUT at 50% of final
value
15, 16,
20, 21 tEN 20 ns C
5.8 Disable time
oscillator ENOSC 50% Low-High
to IOUT at 50% of final
value
15, 16,
20, 21 TDISO 4nsC
5.9 Enab le tim e
oscillator ENOSC 50% High-Low
to IOUT at 50% of final
value
15, 16,
20, 21 TENO 2nsC
5.10 SELA delay SELA Low-High 50% to
IOUT at 50% of final value 15, 16,
20, 21 TSAH TBD ns C
5.11 SELA delay SELA High-Low 50% to
IOUT at 50% of final value 15, 16,
20, 21 TSAL TBD ns C
5.12 Amplifier
bandwidth IOUT = 50 mA, all
channels,
-3 dB value
15, 16,
20, 21 BWLCA 20 MHz C
6 Oscillator
6.1 Oscillator
frequency RF = 4.7 kW15, 16,
20, 21 FOSC 380 470 560 MHz A
6.2 Oscillator
temperature
coefficient
RF = 4.7 kW15, 16,
20, 21 TCOSC -150 ppm/°C C
6.3 Disable time
oscillator ENOSC 50% High-Low
to IOUT , at 10%/90% of
final value
15, 16,
20, 21 TDISO 4nsC
6.4 Enab le tim e
oscillator ENOSC 50% Low-High
to IOUT , at 10%/90% of
final value
15, 16,
20, 21 TENO 2nsC
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
9
T0800
4503C–DVD–12/02
Application Information Oscillator
Figure 4. Frequency vs. Resistor RFA and RFB (RS = 525 W)
Figure 5. Swing vs. Resistor RSA and RSB (RF = 7.82 kW)
Figure 6. Frequency Dependency of Swing
10 T0800 4503C–DVD–12/02
Figure 7. Transfer Characteristic of all Channels (gain = 111)
Figure 8. Output Characteristic (Voltage Compliance) R(IOUT) = 5.8 W
Figure 9. Output Pulse, Read: 50 mA, Write: 250 mA pk-pk
11
T0800
4503C–DVD–12/02
Figure 10. Timing Diagram of IOUT
Figure 11. Application Circuit
ENABLE
NE2
IOUT
tDIS
tr
tr tf
tf
tEN
tON
tON
tr
tr
tf
tON
tON tOFF
tOFF
tOFF
tf
tOFF
NE3
NE4
NE5
VCC
LD
LD
A
n
a
l
o
g
D
i
g
i
t
a
l
IR
I2
I3
I4
I5
RFA
RFB
NE2
NE3
NE4
NE5
ENABLE
VCC1
VCC2
IOUTA
IOUTA
GND
RSA
RSB
IOUTB
IOUTB
SELA
ENOSC
VCC2
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13 VCC
12 T0800 4503C–DVD–12/02
Packag e Information
Ordering Information
Extende d Type Numbe r Package Remarks
T0800-TNQ SSO24 Taped and reeled
T0800-PJQ HP-VFQFP-N28 Taped and reeled
technical drawings
according to DIN
specifications
Package SSO24
Dimensions in mm 8.05
7.80
0.15
0.05
0.25
0.65
7.15
1.30
5.7
5.3
4.5
4.3
6.6
6.3
0.15
24 13
112
13
T0800
4503C–DVD–12/02
Printed on recycled paper.
© Atmel Corporation 2002.
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which is detailed in Atmel’s Terms and Conditions located on the Company’s web site. The Company assumes no responsibility for any errors
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not make any commitment to update the information contained herein. No licenses to patents or other intellectual proper ty of Atmel are granted
by the Company in connection with the s ale of A tmel products, expressly or by implication. Atmel’s products are not aut hor ized for use as critical
components in life suppor t devices or systems.
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