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MAX970 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX970 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 12 page Single/Dual/Quad, Micropower, Ultra-Low-Voltage, Rail-to-Rail I/O Comparators ______________________________________________________________________________________ 11 3) Calculate R1: R1 = (R3 + R4) x (VHB / VCC). Putting in the values for this example, R1 = (2.2M Ω + 10k) x (50mV / 5.0V) = 22.1k Ω. 4) Choose the trip point for VIN rising. This is the threshold voltage where the comparator output tran- sitions from low to high as VIN rises above the trip point. For this example, choose 3.0V. 5) Calculate R2 as follows: where VTHR is the rising-voltage trip threshold. Choose a standard value of 15k Ω. 6) Verify trip voltages and hysteresis as follows: where VTHR is the rising-voltage trip point, and VTHF is the falling-voltage trip point. Circuit Layout and Bypassing Power-supply bypass capacitors are not needed if sup- ply impedance is low, but 100nF bypass capacitors should be used when supply impedance is high or when supply leads are long. Minimize signal lead lengths to reduce stray capacitance between the input and output that might cause instability. IR Receiver Figure 5 shows an application using the MAX965 as an infrared receiver. The infrared photodiode creates a current relative to the amount of infrared light present. This current creates a voltage across R1. When this voltage level crosses the reference voltage applied to the inverting input, the output transitions. Optional R3 provides additional hysteresis for noise immunity. 2-Cell to TTL Logic-Level Shifter Figure 6 shows an application using the MAX965 to convert a 2-cell voltage-level signal into a TTL- compatible signal. The supply voltage for the compara- tor comes from the 2-cell supply. The output is pulled up to a 5V supply. V ri g V V x R x R R R R V falling V V R x V R R Hysteresis V V IN THR REF IN THF THR CC THR THF sin : : = + + + = − + = − 1 1 1 1 2 1 3 4 1 3 4 R V V x R R R R R V x k k M k k THR REF 2 1 1 1 1 1 3 4 2 1 3 0 1 2 22 1 22 1 2 2 10 14 76 = − − + = − − + = . . . . GND VCC VCC VCC VCC 0.1 µF OUT R3 RD RPULL-UP REF MAX965 HYST Figure 5. IR Receiver GND VCC +5V 2 CELLS 0.1 µF OUT INPUT REF MAX965 HYST Figure 6. 2-Cell to TTL Logic-Level Translator |
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