SC9149AHN SILAN [Silan Microelectronics Joint-stock], SC9149AHN Datasheet - Page 5

• Manufacturer Part Number: SC9149AHN
• Description: INFRARED REMOTE CONTROL RECEIVER
• Manufacturer: SILAN [Silan Microelectronics Joint-stock]

FUNCTIONAL DESCRIPTION
1. OSCILLATION CIRCUIT
in IC and 455kHz ceramic resonator ;however , when SC9149A/SC9150A series are used , a stable oscillator can
be constructed by parallel connecting C and R between the oscillator and GND by a single terminal oscillator .
Oscillation frequency is about 38KHz±5 kHz at R=39kΩ and
Characteristic below )
2. RECEIVING SIGNAL INPUT CIRCUIT
The oscillator has been so far constructed through a combination of a linear amplifier by means of CMOS inverter
Timing with transmitter signal and internal operating clock are all decided by this oscillator.
70
60
50
40
30
20
Silan
Semiconductors
700
HANGZHOU SILAN MICROELECTRONICS CO.,LTD.
Capacitor
900
Oscillator frequency vs. resistor and capacitor
(pF)
1100
R=39kΩ
V
Vcc
DD
Amp.
=5V
C
1300
Det.
R
osc
Rx
5
V
DD
SC9149A/SC9150A
70
60
50
40
30
20
26
C=1000pF. (Refer to SCILLATION Frequency
34
Resistor (kΩ）
42
C=1000pF
V
DD
50
=5V
58
Rev: 1.2
2003.01.21