TSOP75S..W

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Vishay Semiconductors

Rev. 2.2, 29-Mar-2021

6

Document Number: 84212

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SUITABLE DATA FORMAT

The TSOP75S..W 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 and fulfill the conditions in the

table below.

When a data signal is applied to the TSOP75S..W 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 Fig. 14 or Fig. 15)

Fig. 14 - IR Disturbance from Fluorescent Lamp

With Low Modulation

Fig. 15 - IR Disturbance from Fluorescent Lamp

With High Modulation

Note

• Best choice of AGC for some popular IR-codes:

- TSOP75S40W: Sony 12 bit, 15 bit, and 20 bit IR-codes

- TSOP75S56W: Cisco SA code

16920

10

100

1000

10000

0

1

2

3

4

5

6

7

0

5

10

15

20

Axis Title

Time (ms)

16921

10

100

1000

10000

-60

-40

-20

0

20

40

0

5

10

15

20

Axis Title

Time (ms)

TSOP75S..W

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

> 10 x burst length

Maximum number of continuous short bursts/second

1800

Suppression of interference from fluorescent lamps

Most common disturbance patterns are suppressed