TSOP373..H, TSOP375..H

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Vishay Semiconductors

Rev. 2.2, 30-Mar-2021

5

Document Number: 82643

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SUITABLE DATA FORMAT

The TSOP373..H, TSOP375..H 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 TSOP373..H,

TSOP375..H 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 Signal from Fluorescent Lamp

With Low Modulation

Fig. 14 - 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 TSOP372..H, TSOP374..H

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)

TSOP373..H

TSOP375..H

Minimum burst length

6 cycles/burst

6 cycles/burst

After each burst of length

a minimum gap time is required of

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

35 cycles

> 6 x burst length

24 cycles

> 25 ms

Maximum number of continuous short bursts/second

2000

2000

MCIR code

Preferred

Yes

RCMM code

Preferred

Yes

XMP-1, XMP-2 code

Preferred

Yes

Suppression of interference from fluorescent lamps

Mild and complex disturbance

patterns are suppressed (example:

signal pattern of Fig. 13 and 14)

Critical disturbance

patterns are suppressed,

e.g. highly dimmed LCDs