TSOP331.., TSOP333.., TSOP335..
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Vishay Semiconductors
Rev. 1.1, 22-Jul-16
5
Document Number: 82742
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SUITABLE DATA FORMAT
This series is designed to suppress spurious output pulses
due to noise or disturbance signals. The devices can
distinguish data signals from noise due to differences in
frequency, burst length, and envelope duty cycle. The data
signal should be close to the device’s band-pass center
frequency (e.g. 38 kHz) and fulfill the conditions in the table
below.
When a data signal presented to the device in the
presence of a disturbance, the sensitivity of the receiver is
automatically reduced by the AGC to insure that no spurious
pulses are present at the receiver’s output. Some examples
which are suppressed are:
• DC light (e.g. from tungsten bulbs sunlight)
• Continuous signals at any frequency
• Strongly or weakly modulated patterns from fluorescent
lamps with electronic ballasts (see Fig. 13 or Fig. 14).
Fig. 13 - IR Disturbance from Fluorescent Lamp
with Low Modulation
Fig. 14 - IR Disturbance from Fluorescent Lamp
with High Modulation
Note
• For data formats with long bursts (more than 10 carrier cycles) please see the datasheet for TSOP332.., TSOP334..
0101520
Time (ms)
16920
IR Signal
5
0101520
Time (ms)
16921
IR Signal
5
TSOP331.. TSOP333.. TSOP335..
Minimum burst length 6 cycles/burst 6 cycles/burst 6 cycles/burst
After each burst of length
A gap time is required of
6 to 70 cycles
≥ 10 cycles
6 to 35 cycles
≥ 10 cycles
6 to 24 cycles
≥ 10 cycles
For bursts greater than
a minimum gap time in the data
stream is needed of
70 cycles
> 1.2 x burst length
35 cycles
> 6 x burst length
24 cycles
> 25 ms
Maximum number of continuous
short bursts/second
2000 2000 2000
MCIR code Yes Preferred Yes
RCMM code Yes Preferred Yes
XMP-1, XMP-2 code Yes Preferred Yes
Suppression of interference from
fluorescent lamps
Mild disturbance patterns
are suppressed (example:
signal pattern of Fig. 13)
Complex disturbance patterns
are suppressed (example: signal
pattern of Fig. 14)
Critical disturbance patterns
are suppressed,
e.g. highly dimmed LCDs
