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參數資料
型號: OP490
廠商: Analog Devices, Inc.
元件分類: 運動控制電子
英文描述: Low Voltage Micropower Quad Operational Amplifier
中文描述: 低電壓,微功耗四運算放大器
文件頁數: 9/12頁
文件大小: 241K
代理商: OP490
OP490
REV. B
–9–
MICROPOWE R VOLT AGE -CONT ROLLE D OSCILLAT OR
An OP490 in combination with an inexpensive quad CMOS
switch comprise the precision V
CO
of Figure 2. T his circuit pro-
vides triangle and square wave outputs and draws only 75
μ
A
from a 5 V supply. A acts as an integrator; S1 switches the
charging current symmetrically to yield positive and negative
ramps. T he integrator is bounded by B which acts as a Schmitt
trigger with a precise hysteresis of 1.67 volts, set by resistors R5,
R6, and R7, and associated CMOS switches. T he resulting out-
put of A is a triangle wave with upper and lower levels of 3.33
and 1.67 volts. T he output of B is a square wave with almost
rail-to-rail swing. With the components shown, frequency of op-
eration is given by the equation:
f
OUT
=
V
CONTROL
(
Volts
)
×
10
Hz
/
V
but this is easily changed by varying C1. T he circuit operates
well up to a few hundred hertz.
Figure 2. Micropower Voltage Controlled Oscillator
相關PDF資料
PDF描述
OP490G Low Voltage Micropower Quad Operational Amplifier
OP490E Low Voltage Micropower Quad Operational Amplifier
OP490F Low Voltage Micropower Quad Operational Amplifier
op490 Low Voltage Micropower Quad Operational Amplifier(低電壓微功率四運放)
op492 Quad OP AMP(四運算放大器)
相關代理商/技術參數
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