Data Sheet

Customer Special
HS0038BD
www.vishay.com
Vishay Semiconductors
Rev. 1.0, 19-Mar-13
5
Document Number: 00750x
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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
• Strongly or weakly 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
0101520
Time (ms)
16920
IR Signal
5
0101520
Time (ms)
16921
IR Signal
5
HS0038BD
Minimum burst length 10 cycles/burst
After each burst of length
a minimum gap time is required of
10 to 70 cycles
 10 cycles
For bursts greater than
a minimum gap time in the data stream is needed of
70 cycles
> 4 x burst length
Maximum number of continuous short bursts/second 1800
Recommended for NEC code yes
Recommended for RC5/RC6 code yes
Recommended for Sony code yes
Recommended for Thomson 56 kHz code yes
Recommended for Mitsubishi code (38 kHz, preburst 8 ms, 16 bit) yes
Recommended for Sharp code yes
Suppression of interference from fluorescent lamps Most common disturbance signals are suppressed