TSOP38438 Vishay, TSOP38438 Datasheet - Page 5

• Manufacturer Part Number: TSOP38438
• Manufacturer: Vishay

Specifications of TSOP38438

• Lead Free Status / RoHS Status: Compliant

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
Note
• For data formats with short bursts please see the datasheet for TSOP383.., TSOP385.., TSOP393.., TSOP395..
Document Number: 81733
Rev. 1.4, 14-Dec-10
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
Recommended for NEC code
Recommended for RC5/RC6 code
Recommended for Sony code
Recommended for Thomson 56 kHz code
Recommended for Mitsubishi code (38 kHz, preburst 8 ms, 16 bit)
Recommended for Sharp code
Suppression of interference from fluorescent lamps
lamps with electronic ballasts (see figure 15 or figure 16)
TSOP382.., TSOP384.., TSOP392.., TSOP394..
IR Receiver Modules for Remote
Control Systems
Most common disturbance
TSOP382.., TSOP392..
signals are suppressed
> 4 x burst length
16921
16920
10 cycles/burst
10 to 70 cycles
 10 cycles
70 cycles
Fig. 15 - IR Signal from Fluorescent Lamp
Fig. 16 - IR Signal from Fluorescent Lamp
1800
0
0
yes
yes
yes
yes
yes
yes
with High Modulation
with Low Modulation
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Vishay Semiconductors
Time (ms)
Time (ms)
10
10
Even extreme disturbance
TSOP384.., TSOP394..
signals are suppressed
> 10 x burst length
15
15
10 cycles/burst
10 to 35 cycles
 10 cycles
35 cycles
1500
yes
yes
yes
yes
no
no
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20
20
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