Document Number 82033

Rev. 10, 15-Oct-2002

www.vishay.com

4

VISHAY

TSOP17..KA1

Vishay Semiconductors

Suitable Data Format

The circuit of the TSOP17..KA1 is designed in that

way that unexpected output pulses due to noise or

disturbance signals are avoided. A bandpassfilter, an

integrator stage and an automatic gain control are

used to suppress such disturbances.

The distinguishing mark between data signal and dis-

turbance signal are carrier frequency, burst length

and duty cycle.

The data signal should fulfill the following conditions:

• Carrier frequency should be close to center fre-

quency of the bandpass (e.g. 38 kHz).

• Burst length should be 10 cycles/burst or longer.

• After each burst which is between 10 cycles and 70

cycles a gap time of at least 14 cycles is necessary.

• For each burst which is longer than 1.8 ms a corre-

sponding gap time is necessary at some time in the

Figure 9. Max. Envelope Duty Cycle vs. Burstlength

Figure 10. Sensitivity vs. Ambient Temperature

Figure 11. Relative Spectral Sensitivity vs. Wavelength

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

10

30

50

70

90

110

Burst Length ( number of cycles / burst )

16915

0.0

0.1

0.2

0.3

0.4

0.5

0.6

–30 –15

0

1530

45607590

16918

Sensitivity in dark ambient

750

850

950

1050

0

0.2

0.4

0.6

0.8

1.2

l – Wavelength ( nm )

1150

94 8408

1.0

Figure 12. Horizontal Directivity

Figure 13. Vertical Directivity

ϕ

y

95 11340p2

0.4

0.2

0

0.2

0.4

0.6

0.6

0.9

0

30

10

20

40

50

60

70

80

1.0

0.8

0.7

95 11339p2

0.4

0.2

0

0.2

0.4

0.6

0.6

0.9

0

30

10

20

40

50

60

70

80

1.0

0.8

0.7