ZL40510/14
Dual Output DVD and CD
4 Channel Laser Diode Drivers
Data Sheet
Features
•
•
•
•
•
•
•
•
•
•
•
•
Single 5 V supply (±10%)
150 mA low-noise read channel with 100 x
current gain
Three 500 mA write channels with 240 x gain
Combined channel output 700 mA
Dual output for DVD/CD laser
Rise and fall times 1 ns typical
Oscillator, 500 MHz, 100 mA with external
resistor control of frequency and amplitude
Power Up/Down control
LVDS control signals
> 2 kV ESD
Low R
th
QFN package
Contact Zarlink for available Custom Gain and
Input Impedance options
ZL40510LDE
ZL40510LDF
ZL40510LDG
ZL40514LDE
ZL40514LDF
ZL40514LDG
Ordering Information
24
24
24
24
24
24
Pin
Pin
Pin
Pin
Pin
Pin
QFN
QFN
QFN
QFN
QFN
QFN
Tubes, Bake & Drypack
Tape & Reel
Trays, Bake & Drypack
Tubes, Bake & Drypack
Tape & Reel
Trays, Bake & Drypack
August 2006
-40°C to +85°C
Applications
•
•
•
•
•
•
•
DVD±RW/RAM
DVD±R
CD-RW
CD-R
Write optical drives
Laser Diode current switch
Supports double density DVD
19
20
21
PWR_UP
INR
IN2
GND
GND
VCC_A
OUTA
18
17
22
23
IN3
IN4
GND
GND 16
OUTB
VCC_B
15
14
24
1
2
3
4
5
6
GND
GND_IN
EN2
/EN2
EN3
/EN3
EN4
/EN4
VCC_IN
7
OSCEN
8
RFA
RFB
9 10
RSA
RSB
SELA
13
11 12
Figure 1 - Functional Block Diagram
1
Zarlink Semiconductor Inc.
Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.
Copyright 2004-2006, Zarlink Semiconductor Inc. All Rights Reserved.
ZL40510/14
PWR_UP
Data Sheet
GND_IN
24
23
22
21
INR
20
IN4
IN3
IN2
19
18
17
16
15
14
13
EN2
/EN2
EN3
/EN3
EN4
/EN4
1
2
3
4
5
6
7
8
9
10
11
12
VCC_A
OUTA
GND
OUTB
VCC_B
SELA
ZL40510
VCC_IN
OSCEN
RSA
Figure 2 - Pinout of 4x4 mm 24 Pin QFN (top view)
Description
The ZL40510/14 are high performance laser drivers capable of driving two separate cathode grounded laser diodes
(e.g., 650 nm and 780 nm laser diodes).
The ZL40510/14 contain a 150 mA low-noise read channel (ChR), and three 500 mA write channels (Ch2, Ch3 and
Ch4). The read channel amplifies the positive current supplied at its reference input, INR, by a fixed factor of 100.
Write channels amplify the positive currents supplied at its reference inputs IN2, IN3, and IN4 by a fixed factor of
240.
An on-chip RF oscillator is provided for the reduction of laser mode hopping noise.
The ZL40510 offers higher tolerance performance.
2
Zarlink Semiconductor Inc.
RSB
RFA
RFB
ZL40510/14
Table of Contents
Data Sheet
1.0 Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Read and Write Channel Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 On-chip RF Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Thermal Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4 Electrical and Optical Pulse Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.5 Specified Electrical Performance with 15 mm Interconnect and Zarlink ZLE40510/14 Evaluation Board. . 7
1.6 Application Layout Guide Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.7 ZLE40510/14 Interconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.0 Application Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.0 Evaluation Boards From Zarlink Semiconductor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.0 Optical Pulse Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.0 Pin List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.0 Characteristic Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.0 I/O Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8.0 Timing Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
9.0 Timing Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
10.0 Example Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
10.1 Write Waveform. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
10.2 Oscillator Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3
Zarlink Semiconductor Inc.
ZL40510/14
List of Figures
Data Sheet
Figure 1 - Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2 - Pinout of 4x4 mm 24 Pin QFN (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Figure 3 - Pulse Response Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 4 - ZLE40510/14 Application Board Electrical Interconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 5 - Application Schematic Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 6 - Typical Optical Eye Diagram Response* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 7 - Write Channel 2, 3 and 4 IP/OP Transfer Characteristic/Temp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 8 - Read Channel IP/OP Transfer Characteristic/Temp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 9 - Write Channel 2, 3 or 4 IP/OP Transfer Characteristic/Vcc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 10 - Write Channel 2, 3 or 4 IP/OP Best Fit Line% Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 11 - Write Channel 2, 3 or 4
∆
lout% Variation with Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 12 - Write Channel 2, 3 or 4
∆
lout% Variation with Vcc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 13 - Oscillator Frequency/RF
Vcc = 5 V, Temp = 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 14 - losc Out/Frequency/
RS = 1 K, 7.5 K, 11 K, Vcc = 5 V, Temp = 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 15 - losc Amplitude mA pk-pk/RSA or RSB
Vcc = 5 V, Temp = 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 16 - losc/Frequency
RS = 7.5 K, Vcc = 5 V, Temp = 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 17 -
∆
Freq% Variation with Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 18 - Oscillator Noise Spectral Density
Vcc = 5 V, Temp = 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 19 - CMOS/LVTTL Input (PWR_UP, OSCEN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 20 - Oscillator Resistors (RF, RS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 21 - Read Current Input (INR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 22 - Output (OUTA, OUTB). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 23 - Write Current Input (IN2, IN3, IN4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 24 - LVDS Input (EN2, /EN2), (EN3, /EN3), (EN4, /EN4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 25 - Timing of Read or Write Channels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 26 - Output Waveform Showing Addition of Read and Write Levels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 27 - Example of Write Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 28 - Example of Oscillator Waveform Superimposed on the Read Waveform . . . . . . . . . . . . . . . . . . . . . . 28
4
Zarlink Semiconductor Inc.
ZL40510/14
1.0
1.1
Data Sheet
Application Notes
Read and Write Channel Operation
The read channel is activated by applying a 'High' signal to the PWR_UP pin. In this mode, the fast write channels
can be enabled by applying a 'High' signal to the respective pair of write enable pins (EN2, /EN2), (EN3, /EN3) or
(EN4, /EN4). The output currents of the four channels are summed together and output as a composite signal at
either OUTA (if SELA select is 'High') or OUTB (if SELA select is 'Low'). This provides the ability to drive two
different laser diodes with just one ZL40510/14.
Voltage control of the channel reference inputs (INR, IN2, IN3 and IN4) can be achieved quite easily using an
external resistor R
ref
in series with the reference channel input to convert a given reference potential V
ref
to an input
current, I
in
:
I
in
=
V
ref
R
ref
+
R
in
,
where R
in
is the input impedance of the respective reference channel.
1.2
On-chip RF Oscillator
An on-chip RF oscillator is enabled if OSCEN = 'High', and its output signal is added to the appropriate current
output (OUTA, if SELA select is 'High', or OUTB, if SELA select is 'Low'). The oscillator amplitude is set by an
external resistor from RSA or RSB to GND. Its frequency is set by an external resistor RFA or RFB to GND. RSA
and RFA are selected when SELA is ‘High’.
The oscillator signal is summed with the programmed Write and Read levels before amplification to the output. The
oscillator signal has zero DC level and +I_pk to –I_pk signal swing. Consequently, if the programmed DC level from
the Write and Read Channels is less than the PK level programmed for the Oscillator, the combined signal will be
clipped on the negative cycle of the signal. This will increase the harmonic content of the output signal and reduce
the pk to pk amplitude output.
1.3
Thermal Considerations
Package thermal resistance is 40°C/W under the EIA/JESD51-3 compliant PCB test board condition.
Users should ensure that the junction temperature does not exceed 150°C. Thermal resistance from junction to
case and to ambient is very much dependent on how the IC is mounted onto the board, on the PCB layout and on
any heat extraction arrangements.
Power consumption and system ambient operating temperature limits should be noted and careful thermal gradient
calculations undertaken to ensure that the junction temperature never exceeds 150°C.
5
Zarlink Semiconductor Inc.