ADT2510 Datasheet, PDF (4/4 Pages) ADTech – Wide Operating Supply Voltage 2.7V ~ 5.5 V

Application Guide
1. Example of Module(37.9kHz) Packaging Using ADT2510
R₁ : 100ohm
IN
ADT2510
fc set pins
S1 S2
VCC
OUT
GND
C₁ : 4.7uF
ADT2510
VCC
OUT
GND
2. Functional Guide of ADT2510
-. ADT2510 is high gain amplifier for high sensitivity. So if you want better characteristic of
receivable distance, you have much careful attention in bonding of GND pads and shielding
to GND.
-. For more better distance performance,it is important to suppress the supply noise.
The supply filter R₁,C₁ have to be located close to IC if possible
-. The photo diode are the important factor in IR receiver module and you select it considerately.
-. In packaging of IR module, the photo lens is good for receiving of photo signal.
But if the chip is included in the lens, the chip also receives the photo signal
and the signal acts as a noise in the chip.
So when you design the lens or module frame, the above point must be considered.
-. In the detection or demodulation(wave shape) of incoming signal, ADT2510 need
the minimum burst length of modulated signals.
The incoming photo signal is modulated with proper carrier signal(e.g.37.9kHz)
and if the ‘1’ data bit is modulated with carrier signal, the period of data bit’1’ is important.
Because the carrier signals is in this period, in the integrator& wave shape block of
ADT2510 the integration need minimum period to the reach of appropriately level.
Hence the minimum burst length is important characteristic and specification of remote
control systems.
The minimum burst length of ADT2510 is about 10 cycles of carrier. (~10*Tfc)
You can easily understand as see the figure 1.
Figure 1.
Carrier Frequency : 37.9kHz
(Input burst waveform)
Burst length
(Integrator output)
(Output pulse)
The minimum
Burst length
* The min. burst length of ADT2510 : ~10cycles of carreier (~10*Tfc)
* This specifications are subject to be changed without notice
Feb. 02. 2007 / Rev. 0.1
4/4
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