參數(shù)資料
型號: NCS2002SN1T1
廠商: ON Semiconductor
文件頁數(shù): 5/16頁
文件大?。?/td> 0K
描述: IC OPAMP ENABLE R/R 1V 6TSOP
產(chǎn)品變化通告: Product Obsolescence 11/Feb/2009
標(biāo)準(zhǔn)包裝: 1
放大器類型: 通用
電路數(shù): 1
輸出類型: 滿擺幅
轉(zhuǎn)換速率: 1.3 V/µs
增益帶寬積: 900kHz
電流 - 輸入偏壓: 10pA
電壓 - 輸入偏移: 500µV
電流 - 電源: 820µA
電流 - 輸出 / 通道: 128mA
電壓 - 電源,單路/雙路(±): 0.9 V ~ 7 V,±0.45 V ~ 3.5 V
工作溫度: -40°C ~ 105°C
安裝類型: 表面貼裝
封裝/外殼: SC-74,SOT-457
供應(yīng)商設(shè)備封裝: 6-TSOP
包裝: 剪切帶 (CT)
其它名稱: 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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