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參數(shù)資料
型號: OP490E
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(shù): 10/16頁
文件大小: 206K
代理商: OP490E
REV. C
OP490
–10–
Micropower Voltage-Controlled Oscillator
An OP490 in combination with an inexpensive quad CMOS
switch comprise the precision V
CO
of Figure 5. This circuit
provides triangle and square wave outputs and draws only 75
m
A
from a 5 V supply. A acts as an integrator; S1 switches the
charging current symmetrically to yield positive and negative
ramps. The integrator is bounded by B which acts as a Schmitt
trigger with a precise hysteresis of 1.67 V, set by resistors R5,
R6, and R7, and associated CMOS switches. The resulting
1
14
2
13
3
12
4
11
5
10
6
9
7
8
S3
S4
S2
S1
CONT
IN/OUT
CONT
OUT/IN
OUT/IN
IN/OUT
IN/OUT
OUT/IN
IN/OUT
OUT/IN
CONT
CONT
V
SS
V
DD
+5V
+5V
1/4
OP490E
A
+5V
R2
200k
V
CONTROL
R1
200k
R3
100k
R4
200k
11
4
2
3
1
TRIANGLE
OUT
+5V
R8
200k
6
5
7
+5V
R5
200k
SQUARE
OUT
R6
200k
R7
200k
C1
75nF
1/4
OP490E
B
Figure 5. Micropower Voltage Controlled Oscillator
output of A is a triangle wave with upper and lower levels of
3.33 V and 1.67 V. The output of B is a square wave with almost
rail-to-rail swing. With the components shown, frequency of
operation is given by the equation:
f
V
Volts
(
Hz V
OUT
CONTROL
=
)
10
/
but this is easily changed by varying C1. The circuit operates
well up to a few hundred hertz.
相關PDF資料
PDF描述
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op492 Quad OP AMP(四運算放大器)
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相關代理商/技術參數(shù)
參數(shù)描述
OP490EY 制造商:Rochester Electronics LLC 功能描述:MICROPOWER QUAD OP AMP IC - Bulk 制造商:Analog Devices 功能描述:
OP490F 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Voltage Micropower Quad Operational Amplifier
OP490FY 制造商:Rochester Electronics LLC 功能描述:MICROPOWER QUAD OP AMP IC - Bulk 制造商:Analog Devices 功能描述:
OP490G 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Voltage Micropower Quad Operational Amplifier
OP490GBC 制造商:Analog Devices 功能描述:
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