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MAX965 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX965 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 12 page Single/Dual/Quad, Micropower, Ultra-Low-Voltage, Rail-to-Rail I/O Comparators function below about 1.5V, although the comparators typically continue to operate with a supply voltage as low as 1V. At low supply voltages (<1.6V), the input common-mode range remains rail-to-rail, but the com- parator’s output sink capability is reduced and propa- gation delay increases (see Typical Operating Characteristics). Figure 1 shows a typical comparator application that monitors VCC at 1.6V. Resistor divider R1/R2 sets the voltage trip point (VTRIP) at 1.6V. As VCC drops below 1.6V and approaches 1V, the reference voltage typical- ly falls below the divider voltage (V+). This causes the comparator output to change state. If OUT’s state must be maintained under these conditions, a latching circuit is required. Comparator Output The MAX965–MAX970 contain a unique slew-rate- controlled output stage capable of rail-to-rail operation with an external pull-up resistor. Typical comparators consume orders of magnitude more current during switching than during steady-state operation. With the MAX965 family of comparators, during an output transi- tion from high to low, the output slew rate is limited to minimize switching current. Voltage Reference With VCC greater than 1.6V but less than 5.5V, the inter- nal 1.235V bandgap reference is ±1.5% accurate over the commercial temperature range and ±2.5% accu- rate over the extended temperature range. The REF output is typically capable of sourcing 50µA. To reduce reference noise or to provide noise immunity, bypass REF with a capacitor (0.1nF to 0.1µF). Noise Considerations The comparator has an effective wideband peak-to- peak noise of around 10µV. The voltage reference has peak-to-peak noise approaching 1.0mV with a 0.1µF bypass capacitor. Thus, when a comparator is used with the reference, the combined peak-to-peak noise is about 1.0mV. This, of course, is much higher than the individual components’ RMS noise. Avoid capacitive coupling from any output to the reference pin. Crosstalk can significantly increase the references’ actual noise. __________Applications Information Hysteresis Many comparators oscillate in the linear region of oper- ation because of noise or undesired parasitic feed- back. This tends to occur when the voltage on one input is equal or very close to the voltage on the other input. The MAX965–MAX970 have internal hysteresis to counter parasitic effects and noise. In addition, with the use of external resistor, the MAX965/MAX967/ MAX968/MAX969’s hysteresis can be programmed to as much as ±50mV (see the section Adding Hysteresis to the MAX965/MAX967/MAX968/MAX969). The hysteresis in a comparator creates two trip points: one for the rising input voltage and one for the falling input voltage (Figure 2). The difference between the trip points is the hysteresis. When the comparator’s input voltages are equal, the hysteresis effectively causes one comparator input voltage to move quickly past the other, thus taking the input out of the region where oscillation occurs. THRESHOLDS OUT IN- IN+ VHB HYSTERESIS BAND VREF - VHYST Figure 2. Threshold Hysteresis Band REF GND VCC VTRIP = 1.22 + 1 VCC VREF OUT R1 47k R2 150k V+ VCC V+ t 1.6V 1.0V 100k MAX965 R1 R2 R1 = x R2 - 1 VTRIP 1.22 Figure 1. Operation below 1.6V _______________________________________________________________________________________ 9 |
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