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PDF ISL58792 Data sheet ( Hoja de datos )
| Número de pieza | ISL58792 | |
| Descripción | Laser Diode Driver | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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DATASHEET
Laser Diode Driver with Serial Control and Write
Current DAC
ISL58792
The ISL58792 is a highly integrated, single supply laser diode
driver designed to support multi-standard writable optical drives
in CD, DVD, and Blu-Ray formats at various speeds. It is a ‘hybrid’
part having an interface compatible with a conventional LDD, but
an internal architecture similar to a write strategy LDD. This
combination adds versatility to the conventional interface.
The rise time, fall time and overshoot of all outputs are
adjustable to compensate for high and low resistance lasers.
The ISL58792 architecture includes dual write current banks,
which can be selected using the bank select line, BSEL. This
eliminates the need to synchronize the serial port to the media.
The oscillator is internally activated through program assignment
to attach to any WEN state.
The WEN lines have internal 100 terminators. There is a skew
detector on the WEN receiver outputs.
Applications
• Combination DVD, CD, and Blue Writable Drives
• BD Camcorders
• BD Video Recorders
Features
• Compatible with all Conventional Controllers Having a Serial
Port, with Some Programming
• Programmable Snubber on all Outputs
• Compatible with Future Controllers Having Gray Coded WEN
Lines for Glitchless High-Speed Operation
• WEN Line Skew Detection
• 1000mA Maximum Total Write Output Current.
• 10-bit x 10-bit Multiplying DAC Output Provides 10-bit Full
Scale Adjustment and 10-bit Resolution at any Full Scale
Output
• Three Laser Outputs Allow Read/Write DVD, CD, and Blue
Combinations
• Single +5V Supply
• Analog Inputs Supports Read APC
• HFM Oscillator Programmable to 100mAP-P and Range from
100MHz to >1GHz
• Programmable HFM On, Off and Cooling Levels
• Programmable Spread Spectrum for Low EMI
• Built-in ADC to Sample Laser Voltage Allows Power Reduction
by Optimizing Headroom
• Built-in Thermal Sensor Aids in Thermal Design
• Serial Input Works up to 50MHz
• Pb-Free (RoHS Compliant)
December 14, 2015
FN7580.3
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas LLC 2010, 2012, 2013, 2015. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL58792
Absolute Maximum Ratings (TA = +25°C)
VSO, Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6V
IBLUE, Voltage at IBLUE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
IOUT1,2, Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000mApk
IBLUE, Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600mApk
VIN, Logic Input Voltages . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to VSO + 0.5V
IIN, Current into RSET, RFREQ, IAPC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA
ESD Rating
Human Body Model (Tested per JESD22-A114F) . . . . . . . . . . . . . 1500V
Machine Model (Tested per JESDD22 A115B). . . . . . . . . . . . . . . . . 100V
Charge Device Model (Tested per JESDD22-C101D). . . . . . . . . . . 1500V
Latch-up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100mA @+125°C
Thermal Information
Thermal Resistance (Typical)
JA (°C/W) JC (°C/W)
24 Lead TQFN (Notes 3, 4) . . . . . . . . . . . . .
42
5.4
PD, Maximum Power Dissipation . . . . . . . . . . . . see Figure 12 on page 13
TS, Storage Temperature Range. . . . . . . . . . . . . . . . . . . . .-60°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Operating Conditions
TA, Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . -10°C to +85°C
TJ, Junction Temperature Range. . . . . . . . . . . . . . . . . . . . -10°C to +150°C
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
3. JA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
Brief TB379.
4. For JC, the “case temp” location is the center of the exposed metal pad on the package underside.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise
noted, all tests are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA
Standard Conditions Unless otherwise indicated, all of the following tables are: VSO = VHI = 5V, RSET = 620Ω, RFREQ = 4.7kΩ,
RLOAD-IOUT1/2 = 8Ω to GND, RLOAD-BLUE = 10Ω to VHI, PMAX = 0x3FF, Reg 1-21 = 88h, Reg x-00 bit6 = 0, TA = +25°C.
Electrical Specifications Standard conditions apply unless otherwise noted.
PARAMETER
DESCRIPTION
MIN MAX
(Note 13) TYP (Note 13)
DC ELECTRICAL SPECIFICATIONS
VSO (Notes 5, 6)
4.5
VIBLUE
IBLUE pin; RLOAD = 10
IVSO Supply Current (No Current Output)
19
IS, dis(nom)
Supply Current, Disable Mode
17
IS, dis(high)
Supply Current; VSO = 5.5V, Disable Mode
25
IBLUE-LEAK1
VIBLUE = 7.0V; IBLUE is Selected; CE = OE = 1; Reg1-21 = 00h
150
IBLUE-LEAK2
VIBLUE = 7.0V; IBLUE is Selected; CE = OE = 1; IAPC pin voltage = 0V
IBLUE-LEAK3
VIBLUE = 7.0V; IBLUE is not Selected; CE = OE = 1
1.1
VIH Input Logic High Level
2.0
VIL Input Logic Low Level
VOH SDIO High Level, IL = -5mA
2.4
VOL SDIO Low Level, IL = 5mA
IINH Logic Input Current High Level
-15
IINL Logic Input Current Low Level
-15
NOTES:
5. Required voltage at the device pins. Allowance must be made for any voltage drop between the power supply and the device.
6. Required voltage also depends on laser diode manufacturer and pickup optical efficiency. Also, see ROUT spec of WDAC.
5.7
7.0
30
100
100
300
80
1.6
0.8
0.4
+15
+10
UNIT
V
V
mA
µA
µA
µA
µA
mA
V
V
V
V
µA
µA
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5
FN7580.3
December 14, 2015
5 Page 
ISL58792
Applications Information
IOUT
The data sheet values for oscillator current, and write current are
based on an RSET of 620 when PMAX and WriteDAC are both set to
full scale. The user may choose RSET to match the output current
needs of the application.
The PMAX DAC is biased by IRSET (= VRSET/RSET). See the
“Typical Performance Curves” on page 11.
The write channel output capability for a typical part is shown in
Figures 1, 2, and 3. The amount of IOUT will be limited by the
available headroom voltage at the IOUTx pins.
A four input DAC (Reg 1-0A bits 3, 2, 1, 0) can be used to control
the amount of RC snubbing applied to the outputs. For IBLUE,
there is an extra bit (Reg 1-0A bit 4) weighted as MSB.
Read current may be controlled by either the Read DAC or the
IAPC input. When set by the PREAD DAC, IREAD is limited to the
data sheet value, whereas the IAPC input will allow a significantly
higher value to be obtained. The ReadDAC and IAPC currents sum
together.
Glitches could occur if two or three WEN lines are changed
simultaneously, and the propagation delay is different for the two
lines between the inner circuits of the controller and the inner
circuits of the LDD. Because the WEN lines are encoded, the
selected write current will be correct before the change in code,
and again after the code changes. But some other output could
result momentarily if the propagation delays are not matched.
The skew detector detects the first rising edge at the LVDS
outputs.
FOSC
Both FOSC and RFREQ may be chosen to accommodate the
desired range or operating point of the HFMFREQ DAC. Although
FOSC is relatively linear with DAC code, monotonicity is not
guaranteed (see Figures 5 and 6).
The oscillator may be turned on by the WEN code selected. The
particular code that selects the oscillator is under program
control. The PCOOL function is also available through the program
control and WEN selection.
The WEB enables write current. WEN code 000 through 111 will
select a write current as described in Table 1.
Power
The main power consumption is caused by the headroom voltage
across the output stage (VSO - VIOUT) x IOUT. For IOUT1 and IOUT2,
the VSO can be reduced below 5.0V, as long as sufficient
headroom voltage is available to obtain the desired output
current. For the blue outputs, the built in ADC can be used to
obtain the output voltage, which is also the headroom voltage.
The HFM oscillator power consumption will increase with
increasing frequency and amplitude (see Figure 7).
Note that in the TQFN package, the die is mounted directly on the
thermal pad. This provides a very low thermal resistance Junction
to thermal pad of just a few °C/W. The problem is in moving the
heat from the thermal pad to some other heat sink.
Figure 12 shows that when mounted well on a 4-layer PCB with 3
ground plane layers, and an area of 10cmx10cm, the JA is
+42°C/W. The typical application will not afford this good of a
heat sink.
Typical Performance Curves
1200
1000
800
IOUT2 vs VHEAD vs PMAX CODE
(REG 1-21 = 88h) (VSO = 4.5V)
(RSET = 620)
600
3FFh
300h
200h
400
100h
200
80h
40h
0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
VHEADROOM (V)
FIGURE 1. IOUT WRITE CURRENT vs VHEADROOM vs PMAX
500
400
3FFh
300h
300
200h
200
100h
100
40h
0
01
234 56
VHEADROOM (V)
001h
78
FIGURE 2. IBLUE vs PMAX vs VHEADROOM (VSO = 5.0V)
(RSET = 620) (1-21 = FFh), (RLOAD = 10)
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FN7580.3
December 14, 2015
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ISL58792.PDF ] | |
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