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TLV3501AIDG4 Datasheet(PDF) 8 Page - Texas Instruments |
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TLV3501AIDG4 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 21 page TLV3501 TLV3502 SBOS321D − MARCH 2005 − REVISED JULY 2005 www.ti.com 8 RELAXATION OSCILLATOR The TLV350x can easily be configured as a simple and inexpensive relaxation oscillator. In Figure 4, the R2 network sets the trip threshold at 1/3 and 2/3 of the supply. Since this is a high-speed circuit, the resistor values are rather low in order to minimize the effect of parasitic capacitance. The positive input alternates between 1/3 of V+ and 2/3 of V+ depending on whether the output is low or high. The time to charge (or discharge) is 0.69R1C. Therefore, the period is 1.38R1C. For 62pF and 1kΩ as shown in Figure 4, the output is calculated to be 10.9MHz. An implementation of this circuit oscillated at 9.6MHz. Parasitic capacitance and component tolerances explain the difference between theory and actual performance. V+ f=10MHz V S =5V 2/3 (V+) 1/3 (V+) R 1 1k Ω R 2 5k Ω R 2 5k Ω R 2 5k Ω V OUT V C V+ t C 62pF 1.38R 1C t Figure 4. Relaxation Oscillator HIGH-SPEED WINDOW COMPARATOR A window comparator circuit is used to determine when a signal is between two voltages. The TLV3502 can readily be used to create a high-speed window comparator. VHI is the upper voltage threshold, and VLO is the lower voltage threshold. When VIN is between these two thresholds, the output in Figure 5 is high. Figure 6 shows a simple means of obtaining an active low output. Note that the reference levels are connected differently between Figure 5 and Figure 6. The operating voltage range of either circuit is 2.7V to 5.5V. TLV3502b TLV3502a V OUT V HI V LO V IN SN74LVC1G02 V HI V LO V IN V OUT V Time Figure 5. Window Comparator—Active High TLV3502b TLV3502a V OUT V HI V LO V IN SN74AHC00 V HI V LO V IN V OUT V Time Figure 6. Window Comparator—Active Low |
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