TSOP2856 Vishay, TSOP2856 Datasheet - Page 3

• Manufacturer Part Number: TSOP2856
• Manufacturer: Vishay

Specifications of TSOP2856

• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Mounting: Through Hole
• Pin Count: 3
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Compliant

Suitable Data Format
The circuit of the TSOP28... 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 ( not
suppressed) and disturbance signal (supressed) are
carrier frequency, burst length and Signal Gap Time
(see diagram below).
The data signal should fullfill the following condition:
frequency of the bandpass (e.g. 38kHz).
neccessary.
signal transmission. There must be a Signal Gap Time
(longer than 15ms) at least each 90ms (see Figure A).
Document Number 82058
Rev. 7, 31-Jan-00
Figure B: Disturbance Signal from Fluorescent Lamp with Signal Gap Time of 7ms
Carrier frequency should be close to center
Burst length should be 6 cycles/burst or longer.
After each burst a gap time of at least 10 cycles is
The data format should not make a continuous
0
0
10
2
Figure A: Data Signal (Output of IR Receiver) with a Signal Gap Time of 20ms
20
4
30
6
40
8
Signal Gap Time
Signal Gap Time
time [ms]
time [ms]
50
10
Some examples for suitable data format are:
NEC Code (repetitive pulse), NEC Code (repetitive
data), Toshiba Micom Format, Sharp Code, RC5
Code, RECS–80 Code, R–2000 Code.
When a disturbance signal is applied to the TSOP28...
it can still receive the data signal. However the
sensitivity is reduced to that level that no unexpected
pulses will occure.
Some examples for such disturbance signals which
are suppressed by the TSOP28... are:
frequency,
DC light (e.g. from tungsten bulb or sunlight),
Continuous signal at 38kHz or at any other
Signals from fluorescent lamps (see Figure B).
Continuous IR signal (e.g. 1ms burst, 2ms pause)
60
12
70
14
Vishay Semiconductors
80
(suppressed by TSOP28..)
16
TSOP28..
90
www.vishay.com
18
100
3 (7)
20