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參數(shù)資料
| 型號(hào)： | HL3280 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | PREAMPLIFIER FOR REMOTE CONTROL USE |
| 中文描述： | 前置放大器的遙控器來 |
| 文件頁數(shù)： | 6/6頁 |
| 文件大小： | 71K |
| 代理商： | HL3280 |
HL3280
6
6. Application Guide
6.1 Example of Module(37.9KHz) Packaging Using HL3280
IN
fc set pins
S1 S2 S3 S4
GND
VCC
OUT
VCC
OUT
GND
HL3280
C1:4.7uF
R1:100
6.2 Functional Guide of HL3280
HL3280 is high gain amplifier for high sensitivity. So if you want better characteristics 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 is 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, HL3280 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, the integration need minimum period to the reach
of appropriately level in the Integrator & Wave Shape block of HL3280.
Hence the minimum burst length is important characteristic and specification of remote
control systems. The minimum burst length of HL3280 is about 10 cycles of carrier.
(~10*Tfc) You can easily understand as see the Figure 1.
Figure 1.
(Input burst waveform)
(Integrator output)
burst length
carrier frequency : 37.9KHz
(Output pulse)
minimum
burst length
* The minimum burst length of HL3280:~10cycles of carrier (~10*Tfc)
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