New Product

TSOP381.., TSOP383.., TSOP385.., TSOP391.., TSOP393..,

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Vishay Semiconductors

Rev. 1.0, 07-May-12

5

Document Number: 81743

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

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 15 or figure 16)

Fig. 14 - IR Signal from Fluorescent Lamp

with Low Modulation

Fig. 15 - 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 TSOP382.., TSOP384.., TSOP392.., TSOP394..

010

15

20

Time (ms)

16920

5

010

15

20

Time (ms)

16921

5

TSOP381.., TSOP391..

TSOP383.., TSOP393..

TSOP385.., TSOP395..

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. 15)

Even critical disturbance signals

are suppressed (examples: signal

pattern of fig. 15 and fig. 16)

Even critical disturbance signals

are suppressed (examples: signal

pattern of fig. 15 and fig. 16)