Motore di ricerca datesheet componenti elettronici
  Italian  ▼
ALLDATASHEETIT.COM

X  

ISL58781 Scheda tecnica(PDF) 10 Page - Intersil Corporation

Il numero della parte ISL58781
Spiegazioni elettronici  Laser Diode Driver with Serial Control and Write Current DAC
Download  15 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Produttore elettronici  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL58781 Scheda tecnica(HTML) 10 Page - Intersil Corporation

Back Button ISL58781 Datasheet HTML 6Page - Intersil Corporation ISL58781 Datasheet HTML 7Page - Intersil Corporation ISL58781 Datasheet HTML 8Page - Intersil Corporation ISL58781 Datasheet HTML 9Page - Intersil Corporation ISL58781 Datasheet HTML 10Page - Intersil Corporation ISL58781 Datasheet HTML 11Page - Intersil Corporation ISL58781 Datasheet HTML 12Page - Intersil Corporation ISL58781 Datasheet HTML 13Page - Intersil Corporation ISL58781 Datasheet HTML 14Page - Intersil Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 15 page
background image
10
FN6909.3
December 3, 2015
Submit Document Feedback
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 10.
The write channel output capability for a typical part is
shown in Figure 1. 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.
Read current may be controlled by either the Read DAC
or the IAPC input. When set by PREAD, 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 Figure 5). Under
extreme conditions, where VSO = 4.5V and temperature
is +125°C, the HFM frequency is only capable of 900MHz
(see Figure 6).
The oscillator may be turned on either by the OSCEN
lines or by the WEN code selected. The particular code
that selects the oscillator is under program control. The
Pcool function is only available through the program
control and WEN selection.
The WEB enables write current. Thus WEN code 000 may
also select a write current.
Power
The main power consumption is caused by the headroom
voltage across the output stage (VSO - VIOUT) xIOUT. For
IOUT1 and IOUT2, the VSO can be reduced below 5.0V
(but above VSO-GOOD), 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 QFN 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 10 shows that when mounted well on a 4-layer
PCB with 3 ground plane layers, and an area of
10cmx10cm, the JA is +37°C/W. The typical application
will not afford this good of a heat sink.
Typical Performance Curves
FIGURE 1. IOUT WRITE CURRENT vs VSD vs
IPMAX_BIAS
FIGURE 2. IBLUE vs PMAX vs VHEADROOM
(VSO =5.0V) (RSET = 620)
(1-21 = FFh), (RLOAD = 10)
VHEADROOM (V)
(REG 1-21 = 88h) (VSO = 4.5V)
IOUT2 vs VHEAD vs PMAX CODE
3FFh
300h
200h
100h
80h
40h
0.00.5
1.01.5
2.02.5
3.0
3.5
4.04.5
0
200
400
600
800
1000
1200
(RSET = 620)
02
5
7
VHEADROOM (V)
13
46
8
3FFh
300h
200h
100h
40h
001h
0
100
200
300
400
500
ISL58781


Codice articolo simile - ISL58781

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
Renesas Technology Corp
ISL58781 RENESAS-ISL58781 Datasheet
822Kb / 15P
   Laser Diode Driver with Serial Control and Write Current DAC
December 3, 2015
ISL58781CRZ-T13 RENESAS-ISL58781CRZ-T13 Datasheet
822Kb / 15P
   Laser Diode Driver with Serial Control and Write Current DAC
December 3, 2015
More results

Descrizione simile - ISL58781

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
Intersil Corporation
ISL58792 INTERSIL-ISL58792 Datasheet
458Kb / 16P
   Laser Diode Driver with Serial Control and Write Current DAC
logo
Renesas Technology Corp
ISL58792 RENESAS-ISL58792 Datasheet
788Kb / 16P
   Laser Diode Driver with Serial Control and Write Current DAC
ISL58781 RENESAS-ISL58781 Datasheet
822Kb / 15P
   Laser Diode Driver with Serial Control and Write Current DAC
December 3, 2015
ISL58797 RENESAS-ISL58797 Datasheet
195Kb / 2P
   Laser Diode Driver with Write Current DAC and PDIC Control Outputs
logo
Intersil Corporation
ISL58797 INTERSIL-ISL58797 Datasheet
116Kb / 2P
   Laser Diode Driver with Write Current DAC and PDIC Control Outputs
logo
Renesas Technology Corp
ISL58797 RENESAS-ISL58797_V01 Datasheet
207Kb / 2P
   Laser Diode Driver with Write Current DAC and PDIC Control Outputs
April 26, 2012
logo
Analog Devices
AD9661A AD-AD9661A Datasheet
174Kb / 12P
   Laser Diode Driver with Light Power Control
REV. 0
logo
Vitesse Semiconductor C...
VSC7938 VITESSE-VSC7938 Datasheet
213Kb / 16P
   Laser Diode Driver with Automatic Power Control
logo
Analog Devices
AD9661A AD-AD9661A_15 Datasheet
626Kb / 12P
   Laser Diode Driver with Light Power Control
REV. 0
logo
Vitesse Semiconductor C...
VSC7939 VITESSE-VSC7939 Datasheet
226Kb / 18P
   Laser Diode Driver with Automatic Power Control
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15


Scheda tecnica Scarica

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEETIT.COM
Lei ha avuto il aiuto da alldatasheet?  [ DONATE ] 

Di alldatasheet   |   Richest di pubblicita   |   contatti   |   Privacy Policy   |   scambio Link   |   Ricerca produttore
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com