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PDF UPC2800AGR Data sheet ( Hoja de datos )
| Número de pieza | UPC2800AGR | |
| Descripción | PREAMPLIFIER FOR INFRARED REMOTE CONTROL | |
| Fabricantes | NEC | |
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DATA SHEET
BIPOLAR ANALOG INTEGRATED CIRCUITS
µ PC2800A
PREAMPLIFIER FOR INFRARED REMOTE CONTROL
DESCRIPTION
The µPC2800A is a receiver preamplifier for infrared remote control systems. It can be directly connected
to a PIN photodiode and integrates a high-gain first-stage amplifier, limiter, bandpass filter, detection circuit,
and waveform shaping circuit to provide a receiver preamplifier on a single chip.
FEATURES
• High reliability due to high-frequency lighting fluorescent lamp
Internal trap circuit
• Internal bandpass filter
Central frequency variable by external resistor: fO = 30 to 80 kHz
Few variation of central frequency thanks to fO trimming
• Low external components
Internal output pull-up resistor and power supply filter resistor
Only low external capacitance required
• ABLC (Automatic Bias Level Control) circuit
Controls fluctuation of bias level cause by disturbance from external light
• Open-collector output
Open-collector output (active low) with pull-up resistor (33 kΩ TYP.)
ORDERING INFORMATION
Part Number
µPC2800AGR
Package
8-pin plastic SOP (225 mil)
The information in this document is subject to change without notice.
Document No. S12974EJ6V0DS00 (6th edition)
Date Published October 1998 N CP(K)
Printed in Japan
The mark shows major revised points.
©
1992
1 page  
µPC2800A
2. EXAMPLE OF MEASURES TO PREVENT MALFUNCTIONING DUE TO NOISE
2.1 Radiation noise
• Keep the wiring length between the PIN photodiode and pin 8 as short as possible.
• Keep the signal lines of pins 2 and 6 as far away as possible from those of pins 7 and 8.
• 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.
• Cover the entire circuit in a shield case.
2.2 Power noise
• Monitor the noise superimposed on pin 3 with an oscilloscope. If high-frequency noise is superimposed,
connect a ceramic capacitor of 0.1 µF or so between pin 3 and GND. If low-frequency noise is
superimposed, increase the capaciance of the capacitor between pin 3 and GND. If necessary, connect
a capacitor between pin 1 and GND.
2.3 External light disturbance noise
• Use a PIN photodiode with an excellent spectral sensitivity.
• Use a PIN photodiode with a lens and with a narrow directional angle.
2.4 Noise
• Insert an external resistor (R1: 1 kΩ or less) in series to C1 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.
3. NOTICE FOR USE
The µPC2800A is designed for the infrared remote control receivers of audio-visual equipment, air conditioner
and so on. Therefore the µPC2800A may not be suitable for some applications that require accurate pulse widths
such as data communications. In case of using the µPC2800A 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 µPC2800A) and so on.
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[MEMO]
µPC2800A
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