TSOP572.., TSOP574..

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Vishay Semiconductors

Datasheet Values Refer to PCN-OPT-1224-2022

Rev. 2.9, 24-Nov-2022

6

Document Number: 82434

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SUITABLE DATA FORMAT

The TSOP572.., TSOP574.. 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 TSOP572.., TSOP574..

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)

• 2.4 GHz and 5 GHz Wi-Fi

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 short bursts please see the datasheet for TSOP573..

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)

AGC CHARACTERISTICS

TSOP572..

TSOP574..

Minimum burst length

10 cycles/burst

10 cycles/burst

After each burst of length

a minimum gap time is required of

10 to 72 cycles

≥ 10 cycles

10 to 40 cycles

≥ 10 cycles

For bursts greater than

a minimum gap time in the data stream is needed of

72 cycles

> 3 x burst length

40 cycles

> 10 x burst length

Maximum number of continuous short bursts/second

950

1500

NEC code

Yes

Preferred

RC5 / RC6 code

Yes

Preferred

RCA 56 kHz code

Yes

Preferred

r-step code

Yes

Preferred

Sony code

Preferred

No

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)