SC9149A View Datasheet(PDF) - Silan Microelectronics
Part Name
Description
MFG CO.
'SC9149A' PDF : 13 Pages View PDF
Silan
Semiconductors
SC9149A/SC9150A
FUNCTIONAL DESCRIPTION
1. OSCILLATION CIRCUIT
Timing with transmitter signal and internal operating clock are all decided by this oscillator.
VDD
osc
C
R
The oscillator has been so far constructed through a combination of a linear amplifier by means of CMOS inverter
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 C=1000pF. (Refer to SCILLATION Frequency
Characteristic below )
Oscillator frequency vs. resistor and capacitor
70
70
60
VDD=5V
R=39kΩ
50
60
VDD=5V
C=1000pF
50
40
40
30
20
700
900
1100
Capacitor (pF)
1300
30
20
26 34
42
50
58
Resistor (kΩ）
2. RECEIVING SIGNAL INPUT CIRCUIT
Vcc
Amp. Det. Rx
HANGZHOU SILAN MICROELECTRONICS CO.,LTD.
Rev: 1.2 2003.01.21
5
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