TSOP31237 Vishay, TSOP31237 Datasheet - Page 6

IR Receiver Module

TSOP31237

Manufacturer Part Number
TSOP31237
Description
IR Receiver Module
Manufacturer
Vishay
Datasheet

Specifications of TSOP31237

Transmission Range
45m
Directivity
45°
Supply Voltage Range
2.5V To 5.5V
Opto Case Style
Through Hole
Operating Temperature Range
-25°C To +85°C
Carrier Frequency
36.7kHz
Supply Current
450µA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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Part Number:
TSOP31237
Quantity:
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TSOP312..
Vishay Semiconductors
Suitable Data Format
The circuit of the TSOP312.. is designed in that way
that unexpected output pulses due to noise or distur-
bance signals are avoided. A bandpass filter, an inte-
grator stage and an automatic gain control are used
to suppress such disturbances.
The distinguishing mark between data signal and dis-
turbance signal are carrier frequency, burst length
and duty cycle.
The data signal should fulfill the following conditions:
• Carrier frequency should be close to center fre-
quency of the bandpass (e.g. 38 kHz).
• Burst length should be 10 cycles/burst or longer.
• After each burst which is between 10 cycles and 70
cycles a gap time of at least 14 cycles is necessary.
• For each burst which is longer than 1.8 ms a corre-
sponding gap time is necessary at some time in the
data stream. This gap time should be at least 4 times
longer than the burst.
• Up to 800 short bursts per second can be received
continuously.
Some examples for suitable data format are: NEC
Code (repetitive pulse), NEC Code (repetitive data),
Toshiba Micom Format, Sharp Code, RC5 Code,
RC6 Code, R-2000 Code, Sony Code.
When a disturbance signal is applied to the
TSOP312.. it can still receive the data signal. How-
ever the sensitivity is reduced to that level that no
unexpected pulses will occur.
Some examples for such disturbance signals which
are suppressed by the TSOP312.. are:
• DC light (e.g. from tungsten bulb or sunlight)
• Continuous signal at 38 kHz or at any other fre-
quency
• Signals from fluorescent lamps with electronic bal-
last with high or low modulation
( see Figure 15 or Figure 16 ).
www.vishay.com
6
Figure 16. IR Signal from Fluorescent Lamp with high Modulation
Figure 15. IR Signal from Fluorescent Lamp with low Modulation
16920
16921
0
0
IR Signal from fluorescent
lamp with high modulation
IR Signal from fluorescent
lamp with low modulation
5
5
Time ( ms )
Time ( ms )
10
10
15
15
Document Number 82217
20
20
Rev. 2, 19-May-03
VISHAY

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