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T0810
3-Channel Laser Driver with RF Osc. and APC Amplifier
Description
www.datashTeehte4uT.c0o8m10 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 gener-
ates 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
VREF
APC
VOUT
I3
NE3 Channel 3
I2
NE2 Channel 2
IR
ENABLE
Read
channel
ENOSC
RF oscillator
RF RS
Figure 1. Block diagram
IOUT
Rev. A5, 08-Aug-01
1 (9)

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T0810
Ordering Information
Extended Type Number
T0810-TCQ
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SSO16
Package
Pin Description
Pin Symbol
Function
1 VOUT APC amplifier output
2 VREF Reference voltage input
3 IR Inp. current, bias voltage approx. GND
4 RF External resistor to GND sets
oscillator frequency
5 I2 Inp. current, bias voltage approx. GND
6 I3 Inp. current, bias voltage approx. GND
7 NE2 Digital control of channel 2
(low active)
8 NE3 Digital control of channel 3
(low active)
9 VCC + 5 V power supply
10 ENOSC Enables RF oscillator (high active)
11 ENABLE Enables output current (high active)
12 RS External resistor to GND sets
oscillator swing
13 GND Ground
14 IOUT Output current source for laser diode
15 VCC + 5 V power supply
16 PDIN Photo diode input
Remarks
Taped and reeled
VOUT 1
16 PDIN
VREF 2
15 VCC
IR 3
14 IOUT
RF 4
I2 5
T0810
13 GND
12 RS
I3 6
11 ENABLE
NE2 7
10 ENOSC
NE3 8
9 VCC
Figure 2. Pinning SSO16
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)
150
–65 to +125
Unit
V
V
V
V
W
_C
_C
2 (9) Rev. A5, 08-Aug-01

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T0810
Thermal Resistance
Parameter
Junction ambient
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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
RthJA
Symbol
VCC
IIR/II2/II3
RF
RS
Tamb
Value
150
Value
4.5 to 5.5
< 0.4
>3
> 100
0 to +70
Unit
K/W
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
Test Conditions / Pins Symbol Min. Typ. Max. Unit
Power supply
Supply current, power down ENABLE = Low,
NE2 = NE3 = Low
ICCPD
0.2 0.4 mA
Supply current, read mode,
Oscillator disabled
Supply current, read mode,
Oscillator enabled
Supply current, write mode
Supply current, input off
Digital inputs
IIR = II2 = II3 = 125 µA
ICCR1
IIR = II2 = II3 = 125 µA,
ENOSC = High, RS = 560 ,
RF = 6.8 k
IIR = II2 = II3 = 125 µA,
NE2 = NE3 = Low
IIR = II2 = II3 = 0 µA
ICCR2
ICCW
ICCoff
90 107 mA
100 118 mA
190 220 mA
15 20 mA
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
VNELO
VNEHI
VENLO
VENHI
VEOLO
VEOHI
2.0
3.0
2.0
INELO
INEHI
IENLO
IENHI
IEOLO
IEOHI
–300
–150
–100
1.3 V
V
0.5 V
V
0.5 V
V
µA
800 µA
µA
100 µA
µA
800 µA
Rev. A5, 08-Aug-01
3 (9)