参数资料
型号: NCS2002SN1T1
厂商: ON Semiconductor
文件页数: 5/16页
文件大小: 0K
描述: IC OPAMP ENABLE R/R 1V 6TSOP
产品变化通告: Product Obsolescence 11/Feb/2009
标准包装: 1
放大器类型: 通用
电路数: 1
输出类型: 满摆幅
转换速率: 1.3 V/µs
增益带宽积: 900kHz
电流 - 输入偏压: 10pA
电压 - 输入偏移: 500µV
电流 - 电源: 820µA
电流 - 输出 / 通道: 128mA
电压 - 电源,单路/双路(±): 0.9 V ~ 7 V,±0.45 V ~ 3.5 V
工作温度: -40°C ~ 105°C
安装类型: 表面贴装
封装/外壳: SC-74,SOT-457
供应商设备封装: 6-TSOP
包装: 剪切带 (CT)
其它名称: NCS2002SN1T1OSCT
NCS2002, NCV2002
http://onsemi.com
13
The noninverting input threshold levels are set so that
the capacitor voltage oscillates between 1/3 and 2/3 of
VCC. This requires the resistors R1a, R1b and R2 to be of
equal value. The following formula can be used to ap-
proximate the output frequency.
RT
470 k
R2
470 k
R1b
470 k
R1a
470 k
CT
1.0 nF
0.9 V
fO = 1.5 kHz
0.67 VCC
R1b
470 k
VCC
D2
1N4148
fO
-
+
-
+
0.9 V
fO+
1
1.39 RTCT
VCC
0.33 VCC
0
Output Voltage
Timing Capacitor
Voltage
VCC
R2
470 k
D1
1N4148
10 k
1.0 M
cw
R1a
470 k
CT
1.0 nF
0.67 VCC
VCC
0.33 VCC
0
Output Voltage
Timing Capacitor
Voltage
0.67 VCC
VCC
0.33 VCC
0
Output Voltage
Timing Capacitor
Voltage
The timing capacitor CT will charge through diode D2 and discharge
through diode D1, 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 VCC, since all the
resistors at the noninverting input are of equal value.
Clockwise, Low Duty Cycle
CounterClockwise, High Duty Cycle
Figure 37. 0.9 V Square Wave Oscillator
Figure 38. Variable Duty Cycle Pulse Generator
cww
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