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參數(shù)資料
| 型號(hào)： | OP490GSZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 2/16頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP GP 20KHZ QUAD 16SOIC |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 放大器類型： | 通用 |
| 電路數(shù)： | 4 |
| 轉(zhuǎn)換速率： | 0.012 V/µs |
| 增益帶寬積： | 20kHz |
| 電流 - 輸入偏壓： | 4.2nA |
| 電壓 - 輸入偏移： | 600µV |
| 電流 - 電源： | 60µA |
| 電壓 - 電源，單路/雙路(±)： | 1.6 V ~ 36 V，±0.8 V ~ 18 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SOIC W |
| 包裝： | 剪切帶 (CT) |
| 產(chǎn)品目錄頁(yè)面： | 772 (CN2011-ZH PDF) |
| 其它名稱： | OP490GSZ-REELCT |
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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
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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