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AS1975 Datasheet(PDF) 10 Page - ams AG |
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AS1975 Datasheet(HTML) 10 Page - ams AG |
10 / 18 page www.austriamicrosystems.com Revision 1.02 10 - 18 AS1970 Data Sheet - Ap p lica tio n In fo r m a tio n 9 Application Information Figure 17 shows a typical application circuit for the AS1970 - AS1975 comparators. Figure 17. Typical Application Diagram – Threshold Detector Hysteresis (AS1970/AS1972/AS1974) The AS1970/AS1972/AS1974 have 3mV internal hysteresis. Additional hysteresis can be generated with three resis- tors using positive feedback (Figure 18), however this method also slows hysteresis response time. Figure 18. Additional Hysteresis AS1970/AS1972/AS1974 Resistor Selection Example For the circuit shown in Figure 18, the following steps can be used to calculate values for R1, R2, and R3. 1. Select R3 first. The current through R3 should be at least 1µA to minimize errors caused by leakage current. The current through R3 at the trip point is: (VREF - VOUT)/R3 (EQ 1) The two possible output states in solving for R3 yields these two formulas: R3 = VREF/1µA (EQ 2) R3 = (VREF - VCC)/1µA (EQ 3) For example, for VREF = 1.2V and VCC = 5V, the two R3 resistor values are 1.2M Ω and 3.8MΩ. Use the smaller of the two resulting resistor values; in this case a standard 1.2M Ω resistor should be used for R3. 2. Choose the hysteresis band (VHB). For this example, use VHB = 50mV. 3. Calculate R1 according to the following equation: R1 = R3(VHB/VCC)(EQ 4) Substituting the example values for R3 and VHB gives: R1 = 1.2M Ω(50mV/5V) = 12kΩ AS1970 - AS1975 RPULLUP † † AS1971/AS1973/AS1975 only VIN 4 IN- 1 OUT 2 VCC 5 VEE 3 IN+ OUT R1 R3 VCC VIN VREF R2 + VEE VCC – |
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