TSOP321.., TSOP323.., TSOP325.., TSOP341.., TSOP343..,

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Vishay Semiconductors

Rev. 2.2, 14-Dec-2021

5

Document Number: 82490

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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 long bursts (more than 10 carrier cycles) please see the datasheet for TSOP348.., TSOP344.., TSOP322.., TSOP324..

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)

TSOP341.., TSOP321..

TSOP343.., TSOP323..

TSOP345.., TSOP325..

Minimum burst length

6 cycles/burst

6 cycles/burst

6 cycles/burst

After each burst of length

A 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

MCIR code

Yes

Preferred

Yes

XMP-1, XMP-2 code

Yes

Preferred

Yes

Suppression of interference from

fluorescent lamps

Mild disturbance patterns are

suppressed (example:

signal pattern of Fig. 13)

Complex disturbance patterns

are suppressed (example: signal

pattern of Fig. 14)

Critical disturbance patterns

are suppressed,

e.g. highly dimmed LCDs