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AS111RCP10/SPACE 参数 Datasheet PDF下载

AS111RCP10/SPACE图片预览
型号: AS111RCP10/SPACE
PDF下载: 下载PDF文件 查看货源
内容描述: 电压比较器 [Voltage Comparator]
分类和应用: 比较器放大器
文件页数/大小: 22 页 / 1614 K
品牌: AUSTIN [ AUSTIN SEMICONDUCTOR ]
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Voltage  
Comparator  
AS111 RAD-TOL  
PRELIMINARY SPECIFICATION  
Austin Semiconductor, Inc.  
20  
Schematic Diagram  
NOTE 20: Pin connections shown on schematic diagram are for the TO08 can package.  
should be shorted together. If they are connected to a trim-  
pot, a 0.01 µF capacitor C1 between pins 5 and 6 will  
minimize the susceptibility to AC coupling. A smaller  
capacitor is used if pin 5 is used for positive feedback as in  
Figure 1.  
CIRCUIT TECHNIQUES FOR AVOIDING  
OSCILLATIONS IN COMPARATOR  
APPLICATIONS  
When a high-speed comparator such as the AS111 is used  
with fast input signals and low source impedances, the output  
response will normally be fast and stable, assuming that the  
power supplies have been bypassed (with 0.1 µF disc capaci-  
tors), and that the output signal is routed well away from the  
inputs (pins 2 and 3) and also away from pins 5 and 6.  
However, when the input signal is a voltage ramp or a slow  
sine wave, or if the signal source impedance is high (1 kW to  
100 kW), the comparator may burst into oscillation near the  
crossing-point. This is due to the high gain and wide  
bandwidth of comparators like theAS111. To avoid oscillation  
or instability in such a usage, several precautions are recom-  
mended, as shown in Figure 1 below.  
2. Certain sources will produce a cleaner comparator  
out put waveform if a 100 pF to 1000 pF capacitor C2 is  
connected directly across the input pins.  
3. When the signal source is applied through a resistive  
network, RS, it is usually advantageous to choose an RS’ of  
substantially the same value, both for DC and for dynamic  
(AC) considerations. Carbon, tin-oxide, and metal-film  
resistors have all been used successfully in comparator  
input circuitry. Inductive wirewound resistors are not  
suitable.  
1. The trim pins (pins 5 and 6) act as unwanted auxiliary  
inputs. If these pins are not connected to a trim-pot, they  
(continued)  
AS111 RAD-TOL  
Rev. 1.1 06/05  
AustinSemiconductor,Inc.reservestherighttochangeproductsorspecificationswithoutnotice.  
9
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