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參數(shù)資料
型號: op490
廠商: Analog Devices, Inc.
英文描述: Low Voltage Micropower Quad Operational Amplifier(低電壓微功率四運放)
中文描述: 低電壓,微功耗四運算放大器(低電壓微功率四運放)
文件頁數(shù): 9/12頁
文件大小: 251K
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
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