參數(shù)資料
型號(hào): OP490GS
廠商: ANALOG DEVICES INC
元件分類: 運(yùn)動(dòng)控制電子
英文描述: Low Voltage Micropower Quad Operational Amplifier
中文描述: QUAD OP-AMP, 1500 uV OFFSET-MAX, 0.02 MHz BAND WIDTH, PDSO16
封裝: MS-013AA, SOIC-16
文件頁(yè)數(shù): 9/12頁(yè)
文件大?。?/td> 241K
代理商: OP490GS
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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