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TLV3502AIDG4 Datasheet(PDF) 7 Page - Texas Instruments |
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TLV3502AIDG4 Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 21 page  TLV3501 TLV3502 SBOS321D − MARCH 2005 − REVISED JULY 2005 www.ti.com 7 APPLICATIONS INFORMATION The TLV3501 and TLV3502 both feature high-speed response and includes 6mV of internal hysteresis for improved noise immunity with an input common-mode range that extends 0.2V 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 µA and the output goes to high impedance. When the shutdown pin is low, the TLV3501 is active. When the TLV3501 shutdown feature is not used, simply connect the shutdown pin to the most negative supply, as shown in Figure 1. It takes about 100ns to come out of shutdown mode. The TLV3502 does not have the shutdown feature. V IN V REF V OUT V S 0.1 µF2.2µF TLV3501 Figure 1. Basic Connections for the TLV3501 OPERATING VOLTAGE TLV3501 comparators are specified for use on a single supply from +2.7V to +5.5V (or a dual supply from ±1.35V to ±2.75V) 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 TLV350x has a robust performance when used with a good layout. However, comparator inputs have little noise immunity within the range of specified offset voltage ( ±5mV). 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 6mV of internal hysteresis of the TLV350x 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 input. Figure 2 shows a typical topology used to introduce 25mV of additional hysteresis, for a total of 31mV hysteresis when operating from a single 5V supply. Total hysteresis is approximated by Equation 1: V HYST + ( V )) R 1 R 1 ) R 2 ) 6mV VHYST sets the value of the transition voltage required to switch the comparator output by enlarging the threshold region, thereby reducing sensitivity to noise. V IN V REF V OUT V S =5V 0.1 µF2.2µF TLV3501 R 1 =51Ω R 2 =10kΩ Figure 2. Adding Hysteresis to the TLV350x INPUT OVER-VOLTAGE PROTECTION Device inputs are protected by ESD diodes that will conduct if the input voltages exceed the power supplies by more than approximately 300mV. Momentary voltages greater than 300mV beyond the power supply can be tolerated if the input current is limited to 10mA. This limiting is easily accomplished with a small input resistor in series with the comparator, as shown in Figure 3. V IN V REF V OUT V S 0.1 µF2.2µF TLV3501 R Figure 3. Input Current Protection for Voltages Exceeding the Supply Voltage (1) |
Similar Part No. - TLV3502AIDG4 |
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Similar Description - TLV3502AIDG4 |
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