t0800-tnq ATMEL Corporation, t0800-tnq Datasheet

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t0800-tnq

Manufacturer Part Number
t0800-tnq
Description
5-channel Laser Driver With Rf Oscillator And 2 Outputs
Manufacturer
ATMEL Corporation
Datasheet
Features
Applications
1. Description
The T0800 is a laser diode driver for the operation of two different, grounded laser
diodes for DVD-RAM (650 nm) and CD-RW (780 nm). It includes five channels for five
different optical power levels which are controlled by a separate IC. The read channel
generates a continuous output level. The channels 2 to 5 are provided as write chan-
nels with very fast switching 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 outputs IOUTA or IOUTB by the select input SELA. Each channel can contrib-
ute 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 current inputs, voltage control is possible by using external resis-
tors. An on-chip RF oscillator reduces laser mode hopping noise 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 current and oscillator switch-off is achieved by a low signal at the ENABLE
input.
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 QFN28 Package
Combo Drives (DVD + CD-RW)
DVD-RAM with CD-RW Capability
DVD-RW with CD-RW Capability
5-Channel Laser
Driver with RF
Oscillator and
2 Outputs
T0800
Rev. 4503D–DVD–02/05

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t0800-tnq Summary of contents

Page 1

... DVD-RW with CD-RW Capability 1. Description The T0800 is a laser diode driver for the operation of two different, grounded laser diodes for DVD-RAM (650 nm) and CD-RW (780 nm). It includes five channels for five different optical power levels which are controlled by a separate IC. The read channel generates a continuous output level ...

Page 2

... ENABLE Digital 13 VCC2 Supply 14 ENOSC Digital 15 SELA Digital 16/17 IOUTB Analog 18 RSB Analog 19 RSA Analog 20 GND Supply 21/22 IOUTA Analog 23 VCC2 Supply 24 VCC1 Supply T0800 VCC1 VCC2 IOUTA IOUTA GND RFA 6 19 RSA RFB 7 18 RSB NE2 8 ...

Page 3

... Output current source A for laser diode Output current source A for laser diode +5 V power supply IOUT +5 V power supply circuit Not connected Input current, bias voltage approximately GND Input current, bias voltage approximately GND Input current, bias voltage approximately GND Should be connected with ground T0800 3 ...

Page 4

... Figure 2-3. T0800 4 Block Diagram I5 Channel 5 NE5 I4 Channel 4 NE4 I3 Channel 3 NE3 I2 Channel 2 NE2 IR Read channel ENABLE RF oscillator ENOSC RFA RFB RSA RSB IOUTA IOUTB SELA 4503D–DVD–02/05 ...

Page 5

... Symbol Value 115 (SSO24) R thJA 35 (QFN28) Symbol Value V 4 < 2 RFA, RFB > 3 RSA, RSB > 100 +70 amb T0800 Unit (2) W °C °C (1) Unit K/W K/W Unit V mA kΩ Ω °C 5 ...

Page 6

... ENABLE = 0 V 3.6 ENABLE high current ENABLE = 5 V 3.7 ENOSC low current ENOSC = 0 V 3.8 ENOSC high current ENOSC = Type means 100% tested 100% correlation tested Characterized on samples Design parameter Note: 1. Related to QFN28 Package T0800 6 (1) Pin Symbol 11,12, 22, ICC PD2 23 11,12, 22, ...

Page 7

... IOFF 20 15, 16, VSE R 20, 21 15, 16, VSE W 20, 21 15, 16, INO O 20, 21 15, 16, TSE R 20, 21 15, 16, TSE W 20 T0800 Min. Typ. Max. Unit 90 100 130 mA/ 200 mA 250 mA 170 220 270 Ω 1. ...

Page 8

... OUT oscillator final value ENOSC 50% Low-High Enable time 6 10%/90% of OUT oscillator final value *) Type means 100% tested 100% correlation tested Characterized on samples Design parameter T0800 8 = 25°C, unless otherwise specified amb Pin Symbol 15, 16, t (1) RISE 20, 21 15, 16, t (1) ...

Page 9

... RFA, RFB (kΩ) Swing versus Resistor RSA and RSB (RF = 7.82 k 120 100 0.0 200.0 400.0 600.0 RSA, RSB (Ω) Frequency Dependency of Swing 200.0 250.0 300.0 350.0 Frequency (MHz) T0800 8.0 9.0 10.0 ) Ω 800.0 1000.0 1200.0 400.0 450.0 500.0 9 ...

Page 10

... Figure 9-4. Figure 9-5. Figure 9-6. T0800 10 Transfer Characteristic of all Channels (Gain = 111) 350 300 250 200 150 100 50 0 0.0 500.0 1000.0 1500.0 IR/I2/I3/I4/I5 (mA) Output Characteristic (Voltage Compliance) R(IOUT) = 5.8 Ω 350 300 250 200 150 100 50 0 0.0 1.0 2.0 VCC - V(IOUT)/V Output Pulse, Read: 50 mA, Write: 250 mA pk-pk 2000 ...

Page 11

... RFA g 6 RFB 7 NE2 D 8 NE3 9 i NE4 10 NE5 g 11 ENABLE T0800 t OFF t OFF t OFF t DIS VCC VCC1 24 VCC2 23 IOUTA LD 22 IOUTA 21 GND 20 RSA 19 RSB 18 LD IOUTB 17 IOUTB 16 SELA 15 ENOSC 14 VCC2 ...

Page 12

... Ordering Information Extended Type Number T0800-TNQ T0800-PJQ 11. Package Information Package SSO24 Dimensions in mm 0.25 0. T0800 12 Package Remarks SSO24 Taped and reeled QFN28 Taped and reeled 8.05 7.80 1.30 0.15 0.05 7.15 13 technical drawings according to DIN specifications 12 5.7 5.3 4.5 4.3 0.15 6.6 6.3 4503D–DVD–02/05 ...

Page 13

... T0800 13 ...

Page 14

... Atmel Corporation 2005. All rights reserved. Atmel SM where You Are and others are the trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be trademarks of others. Atmel Operations Memory ...

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