TSOP2238 Ver la hoja de datos (PDF) - Vishay Semiconductors
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TSOP2238 Datasheet PDF : 8 Pages
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IR Receiver Modules for
Remote Control Systems
New TSOP22..
Vishay Semiconductors
SUITABLE DATA FORMAT
The TSOP22.. 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 TSOP22.. 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 14 or figure 15)
IR Signal from Fluorescent
Lamp with Low Modulation
0
16920
5
10
15
20
Time (ms)
Fig. 14 - IR Signal from Fluorescent Lamp
with Low Modulation
IR Signal from Fluorescent
Lamp with High Modulation
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
Compatible to NEC code
Compatible to RC5/RC6 code
Compatible to Sony code
Compatible to Thomson 56 kHz code
Compatible to Mitsubishi code (38 kHz, preburst 8 ms, 16 bit)
Compatible to Sharp code
Suppression of interference from fluorescent lamps
Note
For data formats with short bursts please see the datasheet of TSOP21..
0
16921
10
10
15
20
Time (ms)
Fig. 15 - IR Signal from Fluorescent Lamp
with High Modulation
TSOP22..
10 cycles/burst
10 to 70 cycles
≥ 12 cycles
70 cycles
> 4 x burst length
800
yes
yes
yes
yes
yes
yes
Most common disturbance signals are suppressed
Document Number: 82095
Rev. 2.0, 18-Jul-08
www.vishay.com
89
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