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TLV3501A-Q1 参数 Datasheet PDF下载

TLV3501A-Q1图片预览
型号: TLV3501A-Q1
PDF下载: 下载PDF文件 查看货源
内容描述: 4.5纳秒的轨至轨高速比较器的Microsize包 [4.5-ns Rail-to-Rail, High-Speed Comparator in Microsize Packages]
分类和应用: 比较器
文件页数/大小: 18 页 / 653 K
品牌: TI [ TEXAS INSTRUMENTS ]
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TLV3501-Q1  
SBOS533A SEPTEMBER 2010REVISED SEPTEMBER 2010  
www.ti.com  
APPLICATION INFORMATION  
The TLV3501-Q1 features high-speed response and includes 6 mV of internal hysteresis for improved noise  
immunity with an input common-mode range that extends 0.2 V beyond the power-supply rails.  
Shutdown  
A shutdown pin allows the device to go into idle when it is not in use. When the shutdown pin is high, the device  
draws about 2 mA and the output goes to high impedance. When the shutdown pin is low, the TLV3501-Q1 is  
active. When the TLV3501-Q1 shutdown feature is not used, connect the shutdown pin to the most negative  
supply, as shown in Figure 15. It takes about 100 ns to come out of shutdown mode.  
VS  
0.1 mF  
2.2 mF  
VIN  
VOUT  
TLV3501-Q1  
VREF  
Figure 15. Basic Connections for the TLV3501-Q1  
Operating Voltage  
TLV3501-Q1 comparators are specified for use on a single supply from +2.7 V to +5.5 V (or a dual supply from  
±1.35 V to ±2.75 V) over a temperature range of 40°C to +125°C. The device continues to function below this  
range, but performance is not specified.  
Adding External Hysteresis  
The TLV3501-Q1 has a robust performance when used with a good layout. However, comparator inputs have  
little noise immunity within the range of specified offset voltage (±5 mV). For slow moving or noisy input signals,  
the comparator output may display multiple switching as input signals move through the switching threshold. In  
such applications, the 6 mV of internal hysteresis of the TLV3501-Q1 might not be sufficient. In cases where  
greater noise immunity is desired, external hysteresis may be added by connecting a small amount of feedback  
to the positive. Figure 16 shows a typical topology used to introduce 25 mV of additional hysteresis, for a total of  
31-mV hysteresis when operating from a single 5-V supply. Total hysteresis is approximated by Equation 1:  
(V+)´R  
1
V
=
+ 6mV  
HYST  
R +R  
1
2
(1)  
VHYST sets the value of the transition voltage required to switch the comparator output by enlarging the threshold  
region, thereby reducing sensitivity to noise.  
VS = 5 V  
0.1 mF  
2.2 mF  
VIN  
VOUT  
TLV3501-Q1  
R1 = 51 W  
R2 = 10 kW  
VREF  
Figure 16. Adding Hysteresis to the TLV3501-Q1  
8
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Copyright © 2010, Texas Instruments Incorporated  
Product Folder Link(s): TLV3501-Q1  
 
 
 
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