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UPC2800AGR Datasheet

  • UPC2800AGR

  • PREAMPLIFIER FOR INFRARED REMOTE CONTROL

  • 12頁

  • NEC   NEC

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碌
PC2800A
2. EXAMPLE OF MEASURES TO PREVENT MALFUNCTIONING DUE TO NOISE
2.1 Radiation noise
鈥?Keep the wiring length between the PIN photodiode and pin 8 as short as possible.
鈥?Keep the signal lines of pins 2 and 6 as far away as possible from those of pins 7 and 8.
鈥?Commonly ground the anode of the PIN photodiode and the external capacitor connected to pin 7.
Separate the GND and power GND of pin 6 from these.
鈥?Cover the entire circuit in a shield case.
2.2 Power noise
鈥?Monitor the noise superimposed on pin 3 with an oscilloscope. If high-frequency noise is superimposed,
connect a ceramic capacitor of 0.1
碌
F or so between pin 3 and GND.
a capacitor between pin 1 and GND.
2.3 External light disturbance noise
鈥?Use a PIN photodiode with an excellent spectral sensitivity.
鈥?Use a PIN photodiode with a lens and with a narrow directional angle.
2.4 Noise
鈥?Insert an external resistor (R
1
: 1 k鈩?or less) in series to C
1
between pin 7 and GND to decrease the voltage
gain. In this case, however, the distance is shortened and care must be exercised not to decrease the
voltage gain too much.
If low-frequency noise is
superimposed, increase the capaciance of the capacitor between pin 3 and GND. If necessary, connect
3. NOTICE FOR USE
The
碌
PC2800A is designed for the infrared remote control receivers of audio-visual equipment, air conditioner
and so on. Therefore the
碌
PC2800A may not be suitable for some applications that require accurate pulse widths
such as data communications. In case of using the
碌
PC2800A under the accurate pulse width condition, confirm
that the output pulses from pin 2 have enough accuracy in actual environmental changing (refer to the following
examples).
Example of environmental changing:
Operating ambient temperature, supply voltage, external disturbing light, external noise, input burst
length, input carrier frequency, strength of input light, direction of input light, distance from transmitter,
characteristics of parts (including the
碌
PC2800A) and so on.
5

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