三合微科股�½有限公司
S
AM
H
OP
Microelectronics Corp.
SM5272B
3
12
RF DECODER
Single Resistor Oscillator
SM5272B's oscillator be constructed by connecting a resistor between OSC1 and OSC2 pin.
SM5272B's OSC frequency must be 1.4 to 6.8 times more than SM5262B.
Encoder OSC Frequency
100
90
80
70
60
KHz 50
40
30
20
10
0
2.5
6
9
12
R = 2.7 M
R = 3.0 M
R = 3.3 M
R = 4.3 M
R = 1.2 M
R = 510K
15 VOLTAGE
Decoder OSC Frequency
300
250
200
180
KHz
100
R = 300 K
R = 100 K
50
R = 620 K
R = 680 K
R = 820 K
R = 1.0 M
0
2.5
6
9
VOLTAGE
Suggested oscillator resistor of SM5262B/ SM5272B:
SM5262B
4.7M OHM
3.0M OHM
2.2M OHM
1.2M OHM
Page 9
SM5272B
750K OHM
390K OHM
270K OHM
160K OHM
OCT. 26, 2001
SAMHOP [ SAMHOP MICROELECTRONICS CORP. ]
