参数资料
型号: OP490GPZ
厂商: Analog Devices Inc
文件页数: 2/16页
文件大小: 0K
描述: IC OPAMP GP 20KHZ QUAD 14DIP
标准包装: 25
放大器类型: 通用
电路数: 4
转换速率: 0.012 V/µs
增益带宽积: 20kHz
电流 - 输入偏压: 4.2nA
电压 - 输入偏移: 600µV
电流 - 电源: 60µA
电压 - 电源,单路/双路(±): 1.6 V ~ 36 V,±0.8 V ~ 18 V
工作温度: -40°C ~ 85°C
安装类型: 通孔
封装/外壳: 14-DIP(0.300",7.62mm)
供应商设备封装: 14-PDIP
包装: 管件
产品目录页面: 773 (CN2011-ZH PDF)
OP490
Rev. E | Page 10 of 16
INPUT VOLTAGE PROTECTION
The OP490 uses a PNP input stage with protection resistors in
series with the inverting and noninverting inputs. The high
breakdown of the PNP transistors coupled with the protection
resistors provides a large amount of input protection, allowing
the inputs to be taken 20 V beyond either supply without
damaging the amplifier.
MICROPOWER VOLTAGE-CONTROLLED
OSCILLATOR
An OP490 in combination with an inexpensive quad CMOS
switch comprise the precision VCO of Figure 22. This circuit
provides triangle and square wave outputs and draws only 75 μA
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 the associated CMOS switches. The resulting
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
fOUT = VCONTROL (Volts) × 10 Hz/V
but this is easily changed by varying C1. The circuit operates
well up to a few hundred hertz.
VCONTROL
00
30
8-
02
2
+
1/4
OP490
A
+
1/4
OP490
B
SQUARE
OUT
IN/OUT
CONT
VSS
VDD
OUT/IN
C1
75nF
TRIANGLE
OUT
R5
200k
R6
200k
+15V
7
6
5
R1
200k
R2
200k
+15V
R4
200k
1
4
11
2
3
R3
100k
S1
S2
S3
S4
R8
200k
+5V
R7
200k
114
213
312
411
510
69
78
Figure 22. Micropower Voltage Controlled Oscillator
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