ATMEL ATR0849-PFQG

Features
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Current-controlled Output Current Source with 4 Input Channels
LVDS Compatible Inputs at Channels 2, 3 and 4 with On-chip 100Ω Termination
Separate Read-channel Enable
Two Selectable Outputs for Grounded Laser Diodes
Output Current per Channel up to 350 mA
Total Output Current up to 600 mA
On-chip RF Oscillator
Control of 2 Different Swings and Frequencies by use of 4 External Resistors
Oscillator Frequency Range from 200 MHz to 500 MHz
Maximum Oscillator Current Amplitude 100 mApp
Single 5V Power Supply
Small Pb-free QFN24, 4 mm × 4 mm Package
Applications
4-Channel LVDS
Laser Driver for
Dual-layer
Application
• DVD+/-RW Dual Layer with CD-RW Capability
• Recordable Optical Drives
ATR0849
1. Description
The ATR0849 is a laser diode driver designed to operate two different grounded laser
diodes for DVD-RW/DVD+RW (650 nm) and CD-RW (780 nm). The device includes
four channels for four different optical power levels. The write channels (channels 2
to 4) can be controlled by fast LVDS (Low Voltage Differential Signaling).
Summary
The read channel generates a continuous output current, whereas channels 2 to 4 are
designed as write channels with very fast switching speed. All channels are summed
together and routed to one of the two outputs, IOUTA or IOUTB, controlled by the
select input, SELA. Each write channel (channel 2 to 4) can contribute up to 350 mA
to the total output current of up to 600 mA. The read channel can contribute up to
150 mA. Total gains of 100 (read channel) and 250 (channels 2, 3 and 4), are 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 available to reduce laser-mode hopping noise during
read mode. The oscillator current amplitude 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 shutdown of the output currents is achieved by a low signal at the ENABLE input.
In read mode, the reference currents (I2, I3, I4) should be switched off to reduce
power consumption.
In case of uncertain (balanced) enable signals, a built-in fail-safe circuit will reduce the
laser diode output current to a safe value.
Rev. 4851BS–DVD–06/05
Note: This is a summary document. A complete dorcument
is available under NDA. For more information, please contact your local Atmel sales office.
Figure 1-1.
Block Diagram
I4
E4
100
Channel 4
100
Channel 3
NE4
I3
E3
NE3
IOUTA
I2
E2
NE2
IR
NER
ENABLE
ENOSC
IOUTB
100
Channel 2
Channel 1
Read channel
RF oscillator
RFA RFB RSA RSB
2
SELA
ATR0849
4851BS–DVD–06/05
ATR0849
2. Pin Configuration
Table 2-1.
RFB
1
SELA
VCC
IR
I2
I3
Pinning QFN24
I4
24 23 22 21 20 19
18 IOUTA
16 GND
E2
4
15 RSA
NE2
5
14 IOUTB
E3
6
13 ENABLE
9 10 11 12
VCC
8
VCC
7
NE4
17 RSB
3
E4
2
NE3
RFA
NER
ENOSC
Figure 2-1.
Pin Description
Pin
Symbol
Type
1
RFB
Analog
External resistor to GND sets frequency of oscillator B
Function
2
RFA
Analog
External resistor to GND sets frequency of oscillator A
3
NER
Digital
Digital control of read channel (channel 1), active low
4
E2
Digital
Digital control of channel 2
5
NE2
Digital
Digital control of channel 2
6
E3
Digital
Digital control of channel 3
7
NE3
Digital
Digital control of channel 3
8
E4
Digital
Digital control of channel 4
9
NE4
Digital
Digital control of channel 4
10
ENOSC
Digital
Digital control of RF oscillator
11
VCC
Supply
+5V power supply
12
VCC
Supply
+5V power supply
13
ENABLE
Digital
Enables output current, active high
14
IOUTB
Analog
Output current source B for laser diode
15
RSA
Analog
External resistor to GND sets swing of oscillator A
16
GND
Supply
Ground, power supply
17
RSB
Analog
External resistor to GND sets swing of oscillator B
18
IOUTA
Analog
Output current source A for laser diode
19
SELA
Digital
High: selects IOUTA, RSA, RFA
Low: selects IOUTB, RSB, RFB
20
VCC
Supply
+5V power supply
21
IR
Analog
Input current, bias voltage approximately GND
22
I2
Analog
Input current, bias voltage approximately GND
23
I3
Analog
Input current, bias voltage approximately GND
24
I4
Analog
Input current, bias voltage approximately GND
Paddle
GND
Supply
Ground, negative power supply
3
4851BS–DVD–06/05
3. Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Parameters
Symbol
Value
Unit
Supply voltage
VCC
–0.5 to +6.0
V
Input voltage at any input
Vin
–0.5 to VCC + 0.5
V
Voltage bettween LVDS inputs
(E2/NE2, E3/NE3, E4/NE4)
Vdmax
1.7
V
Power dissipation
Pmax
0.7(1 ) to 1(2)
W
Output voltage
Vout
–0.5 to VCC – 1
V
Junction temperature
Tj
150
°C
Storage temperature
Tstg
–65 to +125
°C
Symbol
Value
Unit
RthJA
125
K/W
Symbol
Value
Unit
VCC
4.5 to 5.5
V
IIR, II2, II3, II4
< 1.5
mA
Vd
0.5
V
External resistor to GND to set oscillator frequency
RFA, RFB
>3
kΩ
External resistor to GND to set oscillator swing
RSA, RSB
> 100
Ω
Tamb
0 to +70
°C
Notes:
1. RthJA ≤ 115 K/W at Tamb = 70° C
2. RthJA ≤ 15 K/W at Tamb = 25° C
4. Thermal Resistance
Parameters
Junction ambient
Note:
Measured with multi-layer test board (JDEC standard)
5. Recommended Operating Range
Parameters
Supply voltage
Input current
Voltage bettween LVDS inputs
(E2/NE2, E3/NE3, E4/NE4)
Operating temperature range
4
ATR0849
4851BS–DVD–06/05
ATR0849
6. Ordering Information
Extended Type Number
Package
Remarks
ATR0849-PFQG
Pb-free QFN24 (4 mm × 4 mm)
Taped and reeled
7. Package Information
5
4851BS–DVD–06/05
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4851BS–DVD–06/05