TSOP41 Vishay, TSOP41 Datasheet - Page 5

• Manufacturer Part Number: TSOP41
• Description: Ir Receiver Modules For Remote Control Systems
• Manufacturer: Vishay

TSOP41..
Vishay Semiconductors
Suitable Data Format
The circuit of the TSOP41.. is designed so that unex-
pected output pulses due to noise or disturbance sig-
nals are avoided. A bandpass filter, an integrator
stage and an automatic gain control are used to sup-
press 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:
IR Signal from fluorescent
lamp with low modulation
• Carrier frequency should be close to center fre-
quency of the bandpass (e.g. 38 kHz).
0
5
10
15
20
• Burst length should be 6 cycles/burst or longer.
Time (ms)
16920
• After each burst which is between 6 cycles and 70
Figure 13. IR Signal from Fluorescent Lamp with low Modulation
cycles a gap time of at least 10 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 have at least same
length as the burst.
• Up to 2200 short bursts per second can be received
continuously.
Some examples for suitable data format are: NEC
Code, Toshiba Micom Format, Sharp Code, RC5
Code, RC6 Code, RCMM Code, R-2000 Code,
RECS-80 Code.
When a disturbance signal is applied to the TSOP41..
it can still receive the data signal. However the sensi-
tivity is reduced to that level that no unexpected
pulses will occur.
Some examples for such disturbance signals which
are suppressed by the TSOP41.. 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 (an example of the signal modulation is in the fig-
ure below).
Document Number 82135
www.vishay.com
Rev. 1.11, 22-Jan-07
123