TSOP373.., TSOP375..
www.vishay.com
Vishay Semiconductors
Rev. 1.8, 12-Dec-16
5
Document Number: 82446
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
SUITABLE DATA FORMAT
The TSOP373.., TSOP375.. 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.., TSOP375..
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.., TSOP374.. .
0101520
Time (ms)
16920
IR Signal
5
0101520
Time (ms)
16921
IR Signal
5
TSOP373.. TSOP375..
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
