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MAX9064EUK Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX9064EUK Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page Ultra-Small, Low-Power Single Comparators in 4-Bump UCSP and 5-SOT23 8 _______________________________________________________________________________________ Applications Information Bypassing REF/VCC Place a 0.1µF capacitor between REF or VCC and GND as close as possible to the device. During a switching event, all comparators draw a current spike from their power-supply rails. This current spike is minimized by the use of an internal break-before-make design. Hysteresis Operation The MAX9060–MAX9064 feature internal hysteresis for noise immunity and glitch-free operation. If additional hysteresis is needed, an external positive feedback net- work can be easily implemented on the MAX9060, MAX9062, and MAX9064 noninverting input devices. Additional external hysteresis is not recommended for the MAX9061 due to possible crossover current-related noise problems. Additional external hysteresis is not possible on the MAX9063 because the noninverting input of the comparator is not externally accessible. Adaptive Signal Level Detector The MAX9060 and MAX9061 can be used as an adap- tive signal-level detector. Feed a DAC output voltage to REF and connect the input to a variable signal level. As the DAC output voltage is varied from 0.9V to 5.5V, a corresponding signal level threshold-detector circuit is implemented. See Figure 1. PART INPUT VOLTAGE CONDITIONS ACTION AT OUTPUT VIN > VREF External pullup resistor pulls output high. MAX9060 VIN < VREF Output asserts low. VIN > VREF Output asserts low. MAX9061 VIN < VREF External pullup resistor pulls output high. VIN > 0.2V External pullup resistor pulls output high. MAX9062 VIN < 0.2V Output asserts low. VIN > 0.2V Output asserts low. MAX9063 VIN < 0.2V External pullup resistor pulls output high. VIN > 0.2V Output asserts high. MAX9064 VIN < 0.2V Output asserts low. Figure 1. Adaptive Signal Level Detector MAX9060 DAC REF IN MICROCONTROLLER INTERNAL PULLUP VDD I/O OUT Table 1. How Devices Behave Under Various Input Voltage Conditions |
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