TSOP4838ST1 Vishay, TSOP4838ST1 Datasheet - Page 5

• Manufacturer Part Number: TSOP4838ST1
• Manufacturer: Vishay

Specifications of TSOP4838ST1

• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 5.5V
• Mounting: Through Hole
• Pin Count: 3
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Compliant

SUITABLE DATA FORMAT
The TSOP48.., TSOP44.. series 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 TSOP48.., TSOP44.. 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 IR signals from common fluorescent lamps
Note
• For data formats with short bursts please see the datasheet of TSOP41.., TSOP43.. .
Document Number: 82090
Rev. 2.6, 20-Aug-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
(example of noise pattern is shown in fig. 14 or fig. 15)
IR Receiver Modules for Remote
Control Systems
Most common disturbance signals are
> 4 x burst length
10 cycles/burst
10 to 70 cycles
suppressed
≥ 12 cycles
TSOP48..
70 cycles
800
yes
yes
yes
yes
yes
yes
16921
16920
Fig. 14 - IR Signal from Fluorescent Lamp
Fig. 15 - IR Signal from Fluorescent Lamp
0
0
Lamp with High Modulation
IR Signal from Fluorescent
with High Modulation
with Low Modulation
IR Signal from Fluorescent
Lamp with Low Modulation
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TSOP48.., TSOP44..
Vishay Semiconductors
Even extreme disturbance signals are
Time (ms)
Time (ms)
10
10
> 10 x burst length
10 cycles/burst
10 to 35 cycles
suppressed
≥ 12 cycles
TSOP44..
35 cycles
15
15
1300
yes
yes
yes
yes
yes
no
www.vishay.com
20
20
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