TSOP372..H, TSOP374..H

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Vishay Semiconductors

Rev. 2.2, 30-Mar-2021

5

Document Number: 82622

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SUITABLE DATA FORMAT

The TSOP372..H, TSOP374..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 TSOP372..H,

TSOP374..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

Notes

• For data formats with short bursts (less than 10 carrier cycles) please see the datasheet for TSOP373..H, TSOP375..H

• For Sony 12, 15, and 20 bit IR codes please see the datasheet of TSOP37S40H

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)

TSOP372..H

TSOP374..H

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)