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TSOP572.., TSOP574..
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SUITABLE DATA FORMAT
The TSOP572.., TSOP574.. 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 is applied to the TSOP572.., TSOP574..
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.
Vishay Semiconductors
Some examples which are suppressed are:
0
5
10
15
20
? DC light (e.g. from tungsten bulbs sunlight)
16920
Time (ms)
? Continuous signals at any frequency
? Strongly or weakly modulated patterns from fluorescent
lamps with electronic ballasts (see figure 12 or figure 13)
Fig. 13 - IR Signal from Fluorescent Lamp
with Low Modulation
0
5
10
15
20
16921
Time (ms)
Fig. 14 - IR Signal from Fluorescent Lamp
with High Modulation
TSOP572..
TSOP574..
Minimum burst length
After each burst of length
a minimum gap time is required of
For bursts greater than
a minimum gap time in the data stream is needed of
Maximum number of continuous short bursts/second
NEC code
RC5/RC6 code
Thomson 56 kHz code
Suppression of interference from fluorescent lamps
10 cycles/burst
10 to 70 cycles
≥ 10 cycles
70 cycles
> 4 x burst length
800
yes
yes
yes
Most common disturbance
patterns are suppressed
10 cycles/burst
10 to 42 cycles
≥ 10 cycles
42 cycles
> 10 x burst length
1300
preferred
preferred
preferred
Even extreme disturbance
patterns are suppressed
Notes
? For data formats with short bursts please see the datasheet for TSOP573..
? Best choice of AGC for some popular IR-codes:
TSOP57436: RC-5, RC-6, Panasonic;
TSOP57438: NEC, Sharp, r-step;
TSOP57456: r-step, Thomson RCA
Rev. 1.7, 25-Feb-14
5
Document Number: 82434
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
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