T0800-PJQ - Atmel Corporation

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. 4503B–DVD–06/02

2T0800 4503B–DVD–06/02

Pin Configuration

Figure 1. Pinning SSO24

RFA

RFB

NE2

NE3

NE4

NE5

ENABLE

VCC1

VCC2

IOUTA

GND

RSA

RSB

IOUTB

SELA

ENOSC

VCC2

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

T0800

4503B–DVD–06/02

Figure 2. Pinning HP-VFQFP-N28

RFA

RFB

GND

NE2

NE3

IOUTA

GND

RSA

RSB

IOUTB

VCC1

VCC2

NE4

NE5

ENABLE

VCC2

ENOSC

SELA

28 27 26 25 24 23 22

8 9 10 11 12 13 14

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

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

4T0800 4503B–DVD–06/02

Figure 3. Block Diagram

Channel 3

Channel 2

NE3

NE2

Read channel

RF oscillator

ENOSC

ENABLE

RFA RSA

Channel 4

Channel 5

NE4

NE5

IOUTA

IOUTB

RFB RSB SELA

T0800

4503B–DVD–06/02

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 Unit

Junction ambient RthJA 135 K/W

Operating Range

Parameter Symbol Value Unit

Supply voltage range VCC 4.5 to 5.5 V

Input current IIR, II2, II3, II4, II5 < 3 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 4503B–DVD–06/02

Electrical Characteristics

VCC = 5 V, Tamb = 25°C, ENABLE = High, NE2 = NE3 = NE4 = NE5 = High, ENOSC = Low, unless otherwise specified

Parameters Test Conditions Symbol Min. Typ. Max. Unit

Power supply

Supply current, power down ENABLE = Low,

NE2=NE3=NE4=NE5=Low ICCPD2 0.5 mA

Supply current, read mode,

osci llator d isabled IIR=II2= II3= II4= II5= 500 µA ICCR1 90 mA

Supply current, read mode,

oscillator enabled, output A selected IIR=II2= II3= II4= II5=

500 µA, ENOSC=High, RS = 430W,

RF = 7.5 kW, SELA = High

ICCR2 100 mA

Supply curre nt, write mo de IIR=II2= II3= II4= II5= 500 µA,

NE2=NE3=NE4=NE5=Low ICCW195 mA

Supply current, input off IIR=II2=II3=II4= II5=

0 µA ICCoff 18 mA

Digital inputs

NE2/NE3/NE4/NE5 low voltage VNELO 1.3 V

NE2/NE3/NE4/NE5 high voltage VNEHI 2.0 V

SELA low voltage VSELALO 0.5 V

SELA high voltage VSELAHI 2.7 V

ENABLE low voltage VENLO 0.5 V

ENABLE high voltage VENHI 3.0 V

ENOSC low voltage VEOLO 0.5 V

ENOSC high voltage VEOHI 2.0 V

Currents at digital inputs

NE2/NE3/NE4/NE5 low current NE = 0 V INELO -300 µA

NE2/NE3/NE4/NE5 high current NE = 5 V INEHI 800 µA

SELA low current SELA = 0 V ISELALO -50 µA

SELA high current SELA = 5 V ISELAHI 150 µA

ENABLE low current ENABLE = 0 V IENLO -150 µA

ENABLE high current ENABLE = 5 V IENHI 100 µA

ENOSC low current ENOSC = 0 V IEOLO -100 µA

ENOSC high current ENOSC = 5 V IEOHI 800 µA

T0800

4503B–DVD–06/02

Electrical Characteristics: Laser Amplifier

VCC = 5 V, Tamb = 25°C , ENABLE = High, unless otherwise specified

Parameters Test Conditions Symbol Min. Typ. Max. Unit

Outputs IOUTA and IOUTB

Best fit current gain Any channel (1) GAIN 90 100 130 mA/mA

Best fit current offset Any channel (1) IOS -8 +4 mA

Output curr ent lin eari ty Any chan nel (1) ILIN -3 +3 %

Input current range Input is sinking IDAC 0 3 mA

Output curr ent per cha nnel Output is sourcing IOUTR 200 mA

Total output current IOUT 250 mA

IIN input impedance RIN is to G ND RIN 150 200 250 W

NE threshold Temperature stabilized VTH 1.68 V

Output off current 1 ENABLE = Low IOFF11mA

Output off current 2 NE2=NE3=NE4=NE5=High IOFF21mA

Output off current 3 NE2=NE3=NE4=NE5=Low,

IIR=II2=II3=II4=II5=0 µA IOFF35mA

IOUT supply sensitiv ity, read mode IOUT = 40 mA,

VCC = 5 V ±10%, read-only VSER-4 1 %V

IOUT supply sensitivity, write mode IOUT = 80 mA, 40 mA read + 40 mA

write, VCC = 5 V ±10% VSEW-6 0 %V

IOUT current output noise IOUT = 40 mA, ENOSC = Low INOOTBD nA/

rt-Hz

IOUT temperature sensitivity, read

mode IOUT = 40 mA, read only TSER100 ppm/°C

IOUT temperature sensitivity, write

mode IOUT = 80 mA, 40 mA read + 40 mA

write TSEW100 ppm/°C

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 ´ GAI N) + I OS

8T0800 4503B–DVD–06/02

Electrical Characteristics: Laser Current Amplifier Outputs AC Performance

VCC = +5 V, IOUT = 40 mA DC with 40–mA pulse, Tamb = 25°C unless otherwise specified

Parameters Test Conditions Symbol Min. Typ. Max. Unit

Outputs IOUTA and IOUTB

Write rise time IOUT = 40 mA (read)

+40 mA (10%-90% ) 1) tRISE 1.0 3.0 ns

Write fall time IOUT = 40 mA (read)

+40 mA (10%-90% ) 1) tFALL 1.1 3.0 ns

Output curr ent o vershoot IOUT = 40 mA (read) + 40 mA 1) OS 5 %

IOUT ON prop delay NE 50% High-Low to IOUT at 50% of

final value tON 2.0 ns

IOFF OFF prop delay NE 50% Low-High to IOUT at 50% of

final value tOFF 2.0 ns

Disable time ENABLE 50% High-Low to IOUT at

50% of final value tDIS 20 ns

Enable time ENABLE 50% Low-High to IOUT at

50% of final value tEN 20 ns

Disable time oscillator ENOSC 50% Low-High to IOUT at

50% of final value TDISO 4ns

Enable time oscillator ENOSC 50% High-Low to IOUT at

50% of final value TENO 2ns

SELA delay SELA Low-High 50% to

IOUT at 50% of final value TSAH TBD ns

SELA delay SELA High-Low 50% to

IOUT at 50% of final value TSAL TBD ns

Amplifier bandwidth IOUT = 50 mA, all channels,

-3 dB value BWLCA 20 MHz

Oscillator frequency RF = 4.7 kWFOSC 380 470 560 MHz

Oscillator temperature coefficient RF = 4.7 kWTCOSC -150 ppm/°C

Note: 1) Load resistor at IOUT 10 W, measurement with a 50-W oscilloscope and a 39-W series r esistor.

T0800

4503B–DVD–06/02

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 4503B–DVD–06/02

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

T0800

4503B–DVD–06/02

Figure 10. Timing Diagram of IOUT

Figure 11. Application Circuit

ENABLE

NE2

IOUT

tDIS

tr tf

tEN

tON

tON tOFF

tOFF

NE3

NE4

NE5

VCC

RFA

RFB

NE2

NE3

NE4

NE5

ENABLE

VCC1

VCC2

IOUTA

GND

RSA

RSB

IOUTB

SELA

ENOSC

VCC2

13 VCC

12 T0800 4503B–DVD–06/02

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

T0800

4503B–DVD–06/02

Printed on recycled paper.

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components in life suppor t devices or systems.

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4503B–DVD–06/02 xM

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