三合微科股�½有限公司
S
AM
H
OP
Microelectronics Corp.
SM5172
3
12
RF ENCODER
Single Resistor Oscillator
SM5172's oscillator be constructed by connecting a resistor between OSC1 and OSC2 pin.
SM5172's OSC frequency must be 1.8 to 5.8 times more than SM5162.
Encoder OSC Frequency
100
90
80
70
60
KHz 50
40
30
20
10
0
3
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
Dncoder OSC Frequency
300
R = 100 K
250
200
110
KHz 100
R = 300 K
50
R = 620 K
R = 680 K
R = 820 K
R = 1.0 M
0
3
6
9
12
15 VOLTAGE
Suggested oscillator resistor of SM5162/ SM5172:
SM5162
4.7M OHM
3.0M OHM
2.2M OHM
1.2M OHM
Page 9
SM5172
820K OHM
620K OHM
300K OHM
180K OHM
OCT. 2001
SAMHOP [ SAMHOP MICROELECTRONICS CORP. ]
