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| 型號： | ADT2450 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 5V Operating IR Receiver with Excellent Noise Performance for R/C |
| 中文描述： | 5V的工作紅外接收機噪聲性能的R /葷 |
| 文件頁數(shù)： | 4/4頁 |
| 文件大?。?/td> | 49K |
| 代理商： | ADT2450 |
ADT2450
5V Operating IR Receiver
with Excellent Noise Performance for R/C
Feb. 05. 2005 / Rev. 0.0
http://www.ad-tech.co.kr
4/4
Application Guide
1. Example of Module(37.9kHz) Packaging Using ADT2450
2. Functional Guide of ADT2450
-. ADT2450 has 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 R
1
,C
1
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,
ADT2450 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 ADT2450
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 ADT2450 is about 10~11 cycles of carrier. (~10~11*Tfc)
You can easily understand as see the figure 1.
IN
fc set pins
S1 S2 S3 S4
GND
VCC
OUT
VCC
OUT
GND
ADT2450
C
1
: 4.7uF
R
1
: 100ohm
Figure 1.
(Integrator output)
Burst length
Carrier Frequency : 37.9kHz
(Output pulse)
(Input burst waveform)
The minimum
Burst length
* The min. burst length of ADT2450 : ~10-~11cycles of carrier (~10~11*Tfc)
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