參數資料
型號: NCS7101SN2T1
廠商: ON SEMICONDUCTOR
元件分類: 運算放大器
英文描述: 1.8 Volt Rail-to-Rail Operational Amplifier
中文描述: OP-AMP, 9000 uV OFFSET-MAX, 1 MHz BAND WIDTH, PDSO5
封裝: SOT-23, 5 PIN
文件頁數: 12/16頁
文件大?。?/td> 138K
代理商: NCS7101SN2T1
NCS7101
http://onsemi.com
12
The noninverting input threshold levels are set so that
the capacitor voltage oscillates between 1/3 and 2/3 of
V
CC
. This requires the resistors R
1a
, R
1b
and R
2
to be of
equal value. The following formula can be used to
approximate the output frequency.
R
T
470 k
R
2
470 k
R
1b
470 k
R
1a
470 k
C
T
1.0 nF
V
CC
f
O
= 1.5 kHz
0.67 V
CC
0.33 V
CC
+
0.9 V
fO
1
1.39 R
T
C
T
V
CC
0
Output Voltage
Timing Capacitor
Voltage
Figure 34. Square Wave Oscillator
R
1b
470 k
V
CC
D
2
1N4148
f
O
+
V
CC
R
2
470 k
D
1
1N4148
10 k
10 k
1.0 M
cw
R
1a
470 k
C
T
1.0 nF
0.67 V
CC
V
CC
0.33 V
CC
0
Output Voltage
Timing Capacitor
Voltage
0.67 V
CC
V
CC
0.33 V
CC
0
Output Voltage
Timing Capacitor
Voltage
The timing capacitor C
T
will charge through diode D
2
and discharge
through diode D
1
, allowing a variable duty cycle. The pulse width of the
signal can be programmed by adjusting the value of the trimpot. The ca-
pacitor voltage will oscillate between 1/3 and 2/3 of V
CC
, since all the
resistors at the noninverting input are of equal value.
Clockwise, Low Duty Cycle
CounterClockwise, High Duty Cycle
Figure 35. Variable Duty Cycle Pulse Generator
cww
R
1
1.0 M
R
2
1.0 M
R
3
1.0 k
C
in
10 F
2.5 V
10,000 F
+
Ceff.
R1
R3Cin
2.5 V
Figure 36. Positive Capacitance Multiplier
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