New TSOP382../TSOP384..

Document Number 81733

Rev. 1.0, 08-Aug-07

Vishay Semiconductors

www.vishay.com

5

Suitable Data Format

The TSOP38#.. 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 TSOP38#.. 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 15 or figure 16).

For data formats with short bursts please see the data sheet for TSOP381../TSOP383..

Figure 15. IR Signal from Fluorescent Lamp

with low Modulation

Figure 16. IR Signal from Fluorescent Lamp

with high Modulation

010

15

20

Time (ms)

16920

IR Signal from fluorescent

lamp with low modulation

5

010

15

20

Time (ms)

16921

IR Signal from fluorescent

lamp with high modulation

10

TSOP382..

TSOP384..

Minimum burst length

10 cycles/burst

10 cycles/burst

After each burst of length

A gap time is required of

10 to 70 cycles

10 cycles

10 to 35 cycles

10 cycles

For bursts greater than

A gap time in the data stream is needed of

70 cycles

> 4 x burst length

35 cycles

> 10 x burst length

Maximum continuous short bursts/second

1800

1500

Compatible to NEC code

yes

yes

Compatible to RC5/RC6 code

yes

yes

Compatible to Sony code

yes

no

Compatible to Thomson 56 kHz code

yes

yes

Compatible to Mitsubishi code(38 kHz, preburst 8 ms, 16 bit)

yes

no

Compatible to Sharp code

yes

yes

Suppression of interference from fluorescent lamps

Most common disturbance

signals are suppressed

Even extreme disturbance

signals are suppressed