Optical Isolators. LT9910 Datasheet

LT9910 Isolators. Datasheet pdf. Equivalent

Part LT9910
Description (LT Series) Analog Optical Isolators
Feature ( DataSheet : www.DataSheet4U.com ) analog optical isolators Features • High input-to-output voltag.
Manufacture ETC
Datasheet
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( DataSheet : www.DataSheet4U.com ) analog optical isolator LT9910 Datasheet
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LT9910
( DataSheet : www.DataSheet4U.com )
analog optical isolators
Features
• High input-to-output voltage
isolation
• True resistance element output
• Single- or dual-element outputs
available
• Low cost
• Suitable for AC or DC use
• Wide range of input-to-output
characteristics
• Low drive current
• Low “on” resistance, high “off ”
resistance
• Complete solid-state construction
Typical Applications
• DC Isolators
• Feedback Elements in Automatic
Gain Control Circuits
• Audio Limiting and Compression
• Noiseless Switching
• Logic Interfacing
• Remote Gain Control for
Amplifiers
• Photochoppers
• Noiseless Potentiometers
Principle of Operation
Analog Optical Isolators are used in
many different types of circuits and
applications.
Available Related Products
VTL5C Series
LT3011 Series
LT9900 Series
Datasheets available upon request
26 www.optoelectronics.perkinelmer.com
www.DataSheet4U.com
Description
PerkinElmer Optoelectronics has been a leading manufacturer of
analog optical isolators (AOI) for over twenty years and makes a
broad range of standard parts under its trademark VACTROL®.
There are many kinds of optical isolators, but the most common
is the LED/phototransistor type. Other familiar types use output
elements such as light-sensitive SCRs, Triacs, FETs and ICs. The
major application for these silicon-based devices is to provide
electrical isolation of digital lines connected between different
pieces of equipment. The principle of operation is very simple.
When an input current is applied to the LED, the output photo-
transistor turns on. The only connection between the LED and
phototransistor is through light—not electricity—thus the term
optical isolator. These optical isolators are primarily digital in
nature with fast response times for interfacing with logic gates.
Rise and fall times of a few microseconds, faster for some
isolators, are typical.
The AOI also uses an optical link between input and output.
The input element is an LED and the output element is always
a photoconductive cell or, simply a photocell. Together, the
coupled pair act as an electrically variable potentiometer. Since
the output element of the AOI is a resistor, the voltage applied
to this output resistor may be DC and/or AC and the magnitude
may be as low as zero or as high as the maximum voltage rating.
Because the input will control the magnitude of a complex
waveform in a proportional manner, this type of isolator is an
analog-control element. AOIs may be used in the ON-OFF mode
but the fastest response time is only in the millisecond range.
A level-sensitive Schmitt trigger is required between the AOI
and logic gates when used in digital circuits.
Absolute Maximum Ratings @ 25°
Maximum Temperatures
Storage and Operating:
–40°C to 75°C
Cell Power:
Derate Above 30°C:
175 mW
3.9 mW/°C
LED Current:
Derate Above 30°C:
40 mA
0.9 mA/°C
LED Reverse Breakdown Voltage:
3.0 V
LED Forward Voltage Drop @ 20 mA:
2.0 V (1.65 V Typ.)
VTL5C8 = 2.8 V (2.2 V typ.)
VTL5C9 = 2.8 V (2.2 V typ.)
VTL5C10 = 2.8 V (2.2 V typ.)
Minimum Isolation Voltage @
70% Rel. Humidity:
2500 VRMS
Output Cell Capacitance:
5.0 pF
Input/Output Coupling Capacitance: 0.5 pF www.DataSheet4U.com



LT9910
Optical Isolators
Analog Optical Isolators—
VTL5C Series
PerkinElmer Optoelectronics’ line of
AOIs consists of a light-tight package
which houses a light source and one or
more photoconductive cells. Through
control of the input current or voltage
applied to the AOI, the output resistance
can be varied. The output resistance can
be made to switch between an “on” and
“off” state or made to track the input
signal in an analog manner. Because a
small change in input signal can cause a
large change in output resistance, AOIs
have been found to provide a very eco-
nomical and technically superior solu-
tion for many applications.
VTL5C Series
Technical Specification
On Resistance
Part Material Input
Dark
Number Type Current Adapted typ.
VTL5C1
1 mA 20 k
1 10 mA 600
40 mA 200
VTL5C2
1 mA 5.5 k
0 10 mA 800
40 mA 200
VTL5C2/2
0
5 mA
40 mA
2.5 k
700
VTL5C3
1 mA 30 k
3 10 mA 5 k
40 mA 1.5
VTL5C3/2
3
1 mA
40 mA
55 k
2 k
VTL5C4
1 mA 1.2 k
4 10 mA 125
40 mA 75
VTL5C4/2
4
1 mA
10 mA
1.5 k
150
VTL5C6
1 mA 75 k
0 10 mA 10 k
40 mA 2 k
VTL5C7
7
0.4 mA
2 mA
5 k
1.1 k
VTL5C8
1 mA 4.8 k
0 4 mA 1.8 k
16 mA 1 k
VTL5C9 1 2 mA 630
VTL5C10 4 1 mA 400
Off Resistance
@ 10 sec.
min.
50 M
1 M
1 M
10 M
10 M
400 k
400 k
100 M
1 M
10 M
50 M
400 k
Slope
15
24
20
20
19
18.7
8.3
16.7
5.7
8
7.3
3.8
Dynamic
Range
100 db
69 db
65 db
75 db
71 db
72 db
68 db
88 db
75 db
80 db
112 db
75 db
Cell
Voltage
100 V
200 V
50 V
250 V
100 V
50 V
30 V
250 V
50 V
500 V
100 V
50 V
Response Time
Turn-on to 63% Turn-off (Decay)
Final RON typ. to 100max.
2.5 ms
35 ms
3.5 ms
500 ms
7 ms
150 ms
2.5 ms
35 ms
3 ms
50 ms
6 ms
1.5 sec
6 ms
1.5 sec
3.5 ms 50 ms (1 M)
6 ms
1 sec. (100 k)
4 ms
4 ms
1 ms
60 ms
50 ms
1.5 sec
Specification Notes
LED Current: Since the input has a substantially constant
voltage drop, a current-limiting resistance is required.
ON Resistance: Dark adapted resistance measured after 24
or more hours of no input.
OFF Resistance: Measured 10 sec. after removal of the input.
The ultimate resistance is many times greater than the value
at 10 sec.
Response Time: Ascent measured to 63% of final conductance
from the application of 40 mA input. The conductance rise time
to a specified value is increased at reduced input drive while
the conductance decay time to a specified value is decreased.
Typical matching and tracking from 0.4 to 40 mA is 25%.
Measured 5 sec. after removal of the input. The ultimate
resistance is many times greater than the value at 5 sec.
VTL5C9 response times are based on a 2 mA input. VTL5C10
response times are based on a 10 mA input
for ascent time and a 1 mA input for decay time.
LT Series
LT Series Key
R1mA Output Resistance at If=1 mA
R20mA Output Resistance at If=20 mA
R01 Dark Resistance after 1 sec (If=0)
R05 Dark Resistance after 5 sec (If=0)
Top Operating Temperature Range
Tst Storage Temperature Range
Vi Input/Output Insulation Voltage
TC Module Thermal Coefficient
Ton Rise Time to 63% of final R20
Toff Decay Time to 37% of initial R20
Cs Output Capacity
Vmax Operating Voltage at If=0
Pmax Output Power Dissipation at 25˚C
LT Series
Technical Specification
Part
Number
Typical Electro-Optical Characteristics
R1mA R20mA typ. R01 min. R05 min. top range
kkmm˚C
LT3011-2
1
3 9 -20-+60
LT3011 — 0.32 0.1 0.3 -20-+70
LT9909 0.7-1.2 0.35 0.06 0.18 -20-+70
LT9910 1.2-2.5 0.7 0.06 0.18 -20-+70
LT9911 2-5 1.5 0.1 0.3 -20-+70
LT9912 4.5-9 2
0.2 0.6 -20-+70
LT9913 8-16 3.5
0.5 1.5 -20-+70
LT9914 14-25 6
0.7 2.1 -20-+70
tst range
˚C
-20-+80
-20-+70
-20-+70
-20-+70
-20-+70
-20-+70
-20-+70
-20-+70
Vi min. TC 10 lux
V %/˚K
2500 2
2500 0.4
1000 0.4
1000 0.4
1000 0.4
1000 0.4
1000 0.4
1000 0.4
Limit Values
ton toff typ. Cs max. Vmax Pmax
msec msec pF V mW
10 10 2 50 50
50 40 2 100 75
40 40 1 50 50
40 40 1 50 50
50 40 1 100 50
40 30 1 100 50
35 30 1 100 50
35 30 1 100 50
All readings taken at standard light A (2854 K color temperature) after 2 hours of preillumination at 500 lux.
Input/Output Coupling Capacity: 1 pF max.
Reverse Voltage: 4 V max.
Diode Forward Current: 25 mA max. DC
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