TSOP572.., TSOP574..
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Vishay Semiconductors
Rev. 1.5, 20-Jun-12
5
Document Number: 82434
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SUITABLE DATA FORMAT
The TSOP572.., TSOP574.. series is designed to suppress
spurious output pulses due to noise or disturbance signals.
Data and disturbance signals can be distinguished by the
devices according to carrier frequency, burst length and
envelope duty cycle. The data signal should be close to the
band-pass center frequency (e.g. 38 kHz) and fulfill the
conditions in the table below.
When a data signal is applied to the TSOP572.., TSOP574..
in the presence of a disturbance signal, the sensitivity of the
receiver is reduced to insure that no spurious pulses are
present at the output. Some examples of disturbance
signals which are suppressed are:
• DC light (e.g. from tungsten bulb or sunlight)
• Continuous signals at any frequency
• Strongly or weakly modulated noise from fluorescent
lamps with electronic ballasts (see figure 12 or figure 13)
Fig. 13 - IR Signal from Fluorescent Lamp
with Low Modulation
Fig. 14 - IR Signal from Fluorescent Lamp
with High Modulation
Note
• For data formats with short bursts please see the datasheet for TSOP573..
0101520
Time (ms)
16920
IR Signal
5
0101520
Time (ms)
16921
IR Signal
5
TSOP572.. TSOP574..
Minimum burst length 10 cycles/burst 10 cycles/burst
After each burst of length
a minimum gap time is required of
10 to 70 cycles
≥ 10 cycles
10 to 42 cycles
≥ 10 cycles
For bursts greater than
a minimum gap time in the data stream is needed of
70 cycles
> 4 x burst length
42 cycles
> 10 x burst length
Maximum number of continuous short bursts/second 800 1300
Recommended for NEC code Yes Yes
Recommended for RC5/RC6 code Yes Yes
Recommended for Sony code Yes No
Recommended for Thomson 56 kHz code Yes Yes
Recommended for Mitsubishi code (38 kHz, preburst 8 ms, 16 bit) Yes Yes
Recommended for RCMM code No No
Suppression of interference from fluorescent lamps
Most common disturbance
signals are suppressed
Even extreme disturbance
signals are suppressed
