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參數(shù)資料
| 型號(hào)： | CA3240E1 |
| 元件分類(lèi)： | 通用總線(xiàn)功能 |
| 英文描述： | 12 STAGE RIPPLE-CARRY BINARY COUNTER/DIVIDERS |
| 中文描述： | 集成電路雙運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 7/14頁(yè) |
| 文件大?。?/td> | 342K |
| 代理商： | CA3240E1 |
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3-121
Both applied voltage and temperature accelerate these
changes. The process is reversible and offset voltage shifts
of the opposite polarity reverse the offset. In typical linear
applications, where the differential voltage is small and sym-
metrical, these incremental changes are of about the same
magnitude as those encountered in an operational amplifier
employing a bipolar transistor input stage.
Offset-Voltage Nulling
The input offset voltage of the CA3240AE1 and CA3240E1
can be nulled by connecting a 10k
potentiometer between
Terminals 3 and 14 or 5 and 8 and returning its wiper arm to
Terminal 4, see Figure 5A. This technique, however, gives
more adjustment range than required and therefore, a consid-
erable portion of the potentiometer rotation is not fully utilized.
Typical values of series resistors that may be placed at either
end of the potentiometer, see Figure 5B, to optimize its utiliza-
tion range are given in the table “Electrical Specifications for
Equipment Design” shown on third page of this data sheetAn
alternate system is shown in Figure 5C. This circuit uses only
one additional resistor of approximately the value shown in
the table. For potentiometers, in which the resistance does not
drop to 0
at either end of rotation, a value of resistance 10%
lower than the values shown in the table should be used.
Typical Applications
On/Off Touch Switch
The on/off touch switch shown in Figure 6 uses the
CA3240E to sense small currents flowing between two con-
tact points on a touch plate consisting of a PC board metalli-
zation “grid”. When the “on” plate is touched, current flows
between the two halves of the grid causing a positive shift in
the output voltage (Terminal 7) of the CA3240E. These posi-
tive transitions are fed into the CA3059, which is used as a
latching circuit and zero-crossing TRIAC driver. When a pos-
itive pulse occurs at Terminal 7 of the CA3240E, the TRIAC
is turned on and held on by the CA3059 and its associated
positive feedback circuitry (51k
resistor and 36k
/42k
voltage divider). When the positive pulse occurs at Terminal
1 (CA3240E), the TRIAC is turned off and held off in a simi-
lar manner. Note that power for the CA3240E is supplied by
the CA3059 internal power supply.
The advantage of using the CA3240E in this circuit is that it
can sense the small currents associated with skin conduc-
tion while allowing sufficiently high circuit impedance to pro-
vide protection against electrical shock.
Dual Level Detector (Window Comparator)
Figure 7 illustrates a simple dual liquid level detector using
the CA3240E as the sensing amplifier. This circuit operates
on the principle that most liquids contain enough ions in
solution to sustain a small amount of current flow between
two electrodes submersed in the liquid. The current, induced
by an 0.5V potential applied between two halves of a PC
board grid, is converted to a voltage level by the CA3240E in
a circuit similar to that of the on/off touch switch shown in
Figure 6. The changes in voltage for both the upper and
lower level sensors are processed by the CA3140 to activate
an LED whenever the liquid level is above the upper sensor
or below the lower sensor..
FIGURE 5A. BASIC
FIGURE 5B. IMPROVED RESOLUTION
FIGURE 5C. SIMPLER IMPROVED RESOLUTION
NOTE:
11. See Electrical Specification Table on Third page of this data sheet for value of R.
FIGURE 5. THREE OFFSET-VOLTAGE NULLING METHODS, (CA3240AE1, CA3240E1 ONLY)
CA3240
V+
4
13(9)
12(10)
3
(5)
14(8)
V-
1(7)
2(6)
10k
CA3240
V+
V-
10k
R (NOTE 11)
R
(NOTE 11)
CA3240
V+
V-
10k
R
(NOTE 11)
CA3240, CA3240A
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CA3240EX | 制造商:Rochester Electronics LLC 功能描述:BIMOS DUAL OP AMP MOSFET IN BIP OUT BURN-IN 8 PDIP COM - Bulk |
| CA3240EZ | 功能描述:運(yùn)算放大器 - 運(yùn)放 OPAMP 2X 4.5MHZ LWBI AS 0.05NA 8PDIP RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| CA3240R2188 | 制造商:Harris Corporation 功能描述: |
| CA3240T | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Analog IC |
| CA3241E | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Consumer IC |
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