New Product
TSOP321.., TSOP323.., TSOP325.., TSOP341.., TSOP343.., TSOP345..
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Vishay Semiconductors
Rev. 1.1, 01-Oct-12
5
Document Number: 82490
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
SUITABLE DATA FORMAT
These products are 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 IR receiver 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
• Modulated noise from fluorescent lamps with electronic
ballasts (see figure 14 or figure 15)
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 long bursts (more than 10 carrier cycles) please see the datasheet for TSOP348.., TSOP344.., TSOP322.., TSOP324..
0101520
Time (ms)
16920
IR Signal
5
0101520
Time (ms)
16921
IR Signal
5
TSOP341.., TSOP321.. TSOP343.., TSOP323.. TSOP345.., TSOP325..
Minimum burst length 6 cycles/burst 6 cycles/burst 6 cycles/burst
After each burst of length
a minimum 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
Recommended for NEC code yes yes yes
Recommended for RC5/RC6 code yes yes yes
Recommended for Sony code yes no no
Recommended for RCMM code yes yes yes
Recommended for r-step code yes yes yes
Recommended for XMP code yes yes yes
Suppression of interference from
fluorescent lamps
Common disturbance signals are
supressed (example:
signal pattern of fig. 14)
Even critical disturbance signals
are suppressed (examples: signal
pattern of fig. 14 and fig. 15)
Even critical disturbance signals
are suppressed (examples: signal
pattern of fig. 14 and fig. 15)
