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ZL40511 Schematic ( PDF Datasheet ) - Zarlink Semiconductor

Teilenummer ZL40511
Beschreibung (ZL40511 / ZL40515) Dual Output DVD and CD 4 Channel Laser Diode Drivers
Hersteller Zarlink Semiconductor
Logo Zarlink Semiconductor Logo 




Gesamt 30 Seiten
ZL40511 Datasheet, Funktion
www.DataSheet4U.com
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
• CMOS control signals
• > 2 kV ESD
• Low Rth QFN package
• Contact Zarlink for available Custom Gain and
Input Impedance options
19 PWR_UP
20 INR
21 IN2
GND
22 IN3
GND
22 IN4
GND
24 GND_IN GND
1 /EN2
2 N/C
3 /EN3
4 GND
5 /EN4
6 N/C
7 VCC_IN
8 OSCEN
ZL40511/15
Dual Output DVD and CD
4 Channel Laser Diode Drivers
Data Sheet
August 2006
ZL40511LDE
ZL40511LDF
ZL40511LDG
ZL40515LDE
ZL40515LDF
ZL40515LDG
Ordering Information
24 Pin QFN
24 Pin QFN
24 Pin QFN
24 Pin QFN
24 Pin QFN
24 Pin QFN
Tubes, Bake & Drypack
Tape & Reel
Trays, Bake & Drypack
Tubes, Bake & Drypack
Tape & Reel
Trays, Bake & Drypack
-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
VCC_A 18
OUTA 17
GND 16
OUTB 15
VCC_B 14
RFA
RFB RSA
RSB
SELA
9 10
11 12
13
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.






ZL40511 Datasheet, Funktion
ZL40511/15
1.4 Electrical and Optical Pulse Response
Data Sheet
Lfix = 3nH
Lint
2p Vcc_A
Iout
15 500
K
En C_out 17p
Lfix = 3nH
K
Lint
ZL40510 Model
OutA
Cd
Lint=5nH , BW = 460MHz, Rd=7, Q=j20/(15+7) =0.9
Lint=5nH, BW = 460MHz, Rd=3, Q=j20/(15+3) = 1.11
Lint=7nH, BW = 411MHz, Rd=7, Q=j18/(15+7) = 0.8
Lint=7nH, BW = 411MHz, Rd=3, Q=j18/(15+3) = 1.0
C_bypass
Rd
Vd
Figure 2 - Pulse Response Model
Figure 3 illustrates a simplified model of the typical ZL40511/15 and the application. The ZL40511/15 consists of an
ideal switched current source and an equivalent model of the ZL40510/15 output stage. The Electrical Model for the
Laser Diode is a Voltage source Vd (V_on) in series with the On Resistance Rd all in parallel with the Junction
Capacitance Cd. This simplified model approximately represents the Laser Diode Electrical load when operated
beyond the Laser Threshold. To a first approximation, the Optical output is proportional to the current flow in the
Resistor Rd.
The Laser Diode and the ZL40511/15 are connected together buy interconnect tracks with the return current
passing through the supply decoupling bypass capacitor between ground and output Vcc.
The ZL40511/15 can be approximated to an ideal switched programmed current source with a propagation delay of
Iout_on (1.2 nS) and a switch transition time of 400 ps. The final output electrical pulse response parameters, Trise,
Tfall, Overshoot and Undershoot are determined by the combined electrical network as illustrated in Figure 3.
For example, the Rise Time and Fall time for large current steps can be slew rate limited by the combined
interconnect and fixed interconnect inductance. The Fixed Inductance represents that associated with packaging
and minimum interconnect distance. The Interconnect Inductance is that associated with the additional tracking
between Laser Diode and the ZL40511/15 to accommodate application physical limitations.
For example, if a pulse of 360 mA amplitude (40 mA to 400 mA) is to be switched in a time of 1 nS with the Vd =
1.6 V, then the maximum volt drop across the interconnect inductance is approximately 3.5 V (maximum Vpin for
500 mA output) – 1.6 V (Vdiode) = 1.9 V. Consequently, L*di/dt < 1.9 V. Hence, L < 1.9/ (0.36A/1 nS) = 5.3 nH.
Small current step size Rise and Fall Time will be determined by the Bandwidth of the combined network. This is
dominated by the Interconnect Inductance and the output Capacitance. Similarly, the overshoot and undershoot will
be determined by the Q of the network. This is a function of the Source Impedance from the ZL40511/15, the
Interconnect inductance and the Load impedance of the Laser Diode. Figure 3 includes example simplified
estimates of the Q and BW of the combined Laser Diode, ZL40511/15 and interconnect network for two different
interconnect inductance values (5 nH and 7 nH) and two different Diode On resistance (3 Ohm and 7 Ohm). This
simple analysis illustrates the change in BW and Q of the network depending on these parameters. This in turn
effects the Rise Time and Fall time and the Overshoot and Undershoot performance achieved in the application.
6
Zarlink Semiconductor Inc.

6 Page









ZL40511 pdf, datenblatt
ZL40511/15
Absolute Maximum Ratings
Characteristic
Supply voltage (VCC, VCC_IN)
Input voltage (INR, IN2, IN3, IN4)
Input voltage
(PWR_UP, EN2, /EN2, EN3, /EN3, EN4,
/EN4, OSCEN, SELA)
Output voltage (OUTA, OUTB)
Junction temperature
Min.
-0.5
-0.5
-0.5
-0.5
Typ.
Max.
6.0
6.0
(VCC_I
N + 0.5)
Units
V
V
V
Vcc V
150 °C
Data Sheet
Comments
Operating Range
Characteristic
Supply voltage (VCC, VCC_IN)
Input voltage (INR)
Input voltage (IN2, IN3, IN4)
Output voltage (OUTA, OUTB)
RF
RS
Operating temperature range, junction
Min.
4.5
-0.3
1
1
0
Typ.
Max.
5.5
0.7
0.7
(VCCA,
B-0.9)
150
Units
V
V
V
V
k
k
°C
Comments
External resistor to GND
External resistor to GND
Package Thermal Resistance
Package Type
24 pin QFN
Junction to
Case
RthJC
ambient
RthJA
40
Units
Comments
K/W Exposed paddle soldered to multi-layer PCB
12
Zarlink Semiconductor Inc.

12 Page





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