TSOP322.., TSOP324.., TSOP344.., TSOP348..

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Vishay Semiconductors

Rev. 1.9, 14-Dec-2021

5

Document Number: 82489

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SUITABLE DATA FORMAT

This series is designed to suppress spurious output pulses

due to noise or disturbance signals. The devices can

distinguish data signals from noise due to differences in

frequency, burst length, and envelope duty cycle. The data

signal should be close to the device’s band-pass center

frequency (e.g. 38 kHz) and fulfill the conditions in the table

below.

When a data signal is applied to the product in the presence

of a disturbance, the sensitivity of the receiver is

automatically reduced by the AGC to insure that no spurious

pulses are present at the receiver’s output. Some examples

which are suppressed are:

• DC light (e.g. from tungsten bulbs sunlight)

• Continuous signals at any frequency

• Strongly or weakly modulated patterns from fluorescent

lamps with electronic ballasts (see Fig. 13 or Fig. 14).

Fig. 13 - IR Disturbance from Fluorescent Lamp

With Low Modulation

Fig. 14 - IR Disturbance from Fluorescent Lamp

With High Modulation

Notes

• For data formats with short bursts please see the datasheet for TSOP323.., TSOP325.., TSOP343.., TSOP345..

• For Sony 12, 15, and 20 bit IR codes please see the datasheet of TSOP34S40F, TSOP32S40F

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)

TSOP322.., TSOP348..

TSOP324.., TSOP344..

Minimum burst length

10 cycles/burst

10 cycles/burst

After each burst of length

a minimum gap time is required of

10 to 70 cycles

≥ 10 cycles

10 to 35 cycles

≥ 10 cycles

For bursts greater than

a minimum gap time in the data stream is needed of

70 cycles

> 4 x burst length

35 cycles

> 10 x burst length

Maximum number of continuous short bursts/second

1800

1500

NEC code

Yes

Preferred

RC5/RC6 code

Yes

Preferred

Thomson 56 kHz code

Yes

Preferred

Sharp code

Yes

Preferred

Suppression of interference from fluorescent lamps

Mild disturbance patterns

are suppressed (example:

signal pattern of Fig. 13)

Complex and critical disturbance patterns

are suppressed (example: signal pattern

of Fig. 14 or highly dimmed LCDs)