SM5272B
312 RF DECODER
S
AMHOP Microelectronics Corp.
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
R = 510K
70
60
50
40
KHz
R = 1.2 M
30
20
R = 2.7 M
R = 3.0 M
R = 3.3 M
R = 4.3 M
10
0
2.5
6
9
12
15 VOLTAGE
Decoder OSC Frequency
300
250
R = 100 K
200
180
KHz
100
R = 300 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
SM5272B
750K OHM
390K OHM
270K OHM
160K OHM
Page 9
OCT. 26, 2001
SAMHOP [ SAMHOP MICROELECTRONICS CORP. ]
