TSOP573.., TSOP575..
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Vishay Semiconductors
Rev. 1.4, 25-Feb-14
5
Document Number: 82450
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SUITABLE DATA FORMAT
The TSOP573.., TSOP575.. 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 TSOP573.., TSOP575..
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 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
Notes
• For data formats with long bursts (more than 10 carrier cycles) please see the datasheet for TSOP572.., TSOP574.. .
• Best choice of AGC for some popular IR-codes:
-
TSOP57336: MCIR, RCMM
-
TSOP57538: Mitsubishi, RECS-80 Code
-
TSOP57338: XMP-1, XMP-2, r-map
0
10
15
20
Time (ms)
16920
IR Signal
5
0
10
15
20
Time (ms)
16921
IR Signal
5
TSOP573..
TSOP575..
Minimum burst length
6 cycles/burst
6 cycles/burst
After each burst of length
a minimum gap time is required of
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
35 cycles
> 6 x burst length
24 cycles
> 25 ms
Maximum number of continuous
short bursts/second
2000
2000
MCIR code
preferred
yes
RCMM code
preferred
yes
XMP-1, XMP-2 code
preferred
yes
Suppression of interference from
fluorescent lamps
Even critical disturbance patterns are suppressed
(example: signal pattern of fig. 12 and fig. 13)
Even critical disturbance patterns are suppressed
(example: signal pattern of fig. 12 and fig. 13)
