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参数资料
| 型号： | OP490E |
| 厂商： | Analog Devices, Inc. |
| 元件分类： | 运动控制电子 |
| 英文描述： | Low Voltage Micropower Quad Operational Amplifier |
| 中文描述： | 低电压，微功耗四运算放大器 |
| 文件页数： | 10/16页 |
| 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.
相关PDF资料 |
PDF描述 |
|---|---|
| OP490F | Low Voltage Micropower Quad Operational Amplifier |
| op490 | Low Voltage Micropower Quad Operational Amplifier(低电压微功率四运放) |
| op492 | Quad OP AMP(四运算放大器) |
| op292 | Dual OP AMP(双运算放大器) |
| OP492 | DUAL/QUAD SINGLE SUPPLY OPERATIONAL AMPLIFIER |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 制造商全称: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 制造商全称: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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