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MAX972EBL-T Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX972EBL-T Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 17 page Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparators 10 ______________________________________________________________________________________ Low-Voltage Operation: V+ = 1V (MAX9_4 Only) The guaranteed minimum operating voltage is 2.5V (or ±1.25V). As the total supply voltage falls below 2.5V, performance degrades and the supply current falls. The reference will not function below about 2.2V, although the comparators will continue to operate with a total supply voltage as low as 1V. While the MAX9_4 has comparators that may be used at supply voltages below 2V, the MAX9_1/MAX9_2/MAX9_3 may not be used with supply voltages below 2.5V. At low supply voltages, the comparators’ output sink capability is reduced and the propagation delay increases (see Typical Operating Characteristics). The useful input voltage range extends from the negative supply to a little under 1V below the positive supply, which is slightly closer to the positive rail than when the device operates from higher supply voltages. Test your prototype over the full temperature and supply-voltage range if you anticipate operation below 2.5V. Comparator Output With 100mV of overdrive, propagation delay is typically 3µs. The Typical Operating Characteristics show the propagation delay for various overdrive levels. The open-drain outputs are intended for wire-ORed and level-shifting applications. The maximum output voltage is 11V above V-, and may be applied even when no supply voltage is present (V+ = V-). The MAX9_1 and MAX9_4 outputs sink current to GND, making these devices ideal for bipolar to single-ended conversion and level-shifting applications. The negative supply does not affect the output sink current. The positive supply provides gate drive for the output N-channel MOSFET and heavily influences the output current capability, especially at low supply voltages (see Typical Operating Characteristics section). The MAX9_2 and MAX9_3 have no GND pin, and their outputs sink current to V-. Voltage Reference The internal bandgap voltage reference has an output of 1.182V above V-. Note that the REF voltage is referenced to V-, not to GND. Its accuracy is ±1% (MAX971/MAX973/MAX974) or ±2% (MAX981–MAX984) in the 0°C to +70°C range. The REF output is typically capable of sourcing 25µA and sinking 15µA. Do not bypass the REF output. Noise Considerations Although the comparators have a very high gain, useful gain is limited by noise. This is shown in the Transfer Function graph (see Typical Operating Characteristics). As the input voltage approaches the comparator’s offset, the output begins to bounce back and forth; this peaks when VIN = VOS. (The lowpass filter shown on the graph averages out the bouncing, making the transfer function easy to observe.) Consequently, the comparator has an effective wideband peak-to-peak noise of around 300µV. The voltage reference has peak-to-peak noise approaching 1mV. Thus, when a comparator is used with the reference, the combined peak-to-peak noise is about 1mV. This, of course, is much higher than the RMS noise of the individual components. Take care in your layout to avoid capacitive coupling from any output to the reference pin. Crosstalk can significantly increase the actual noise of the reference. THRESHOLDS OUT IN- IN+ VHB HYSTERESIS BAND VREF - VHYST Figure 2. Threshold Hysteresis Band 7 2 5 6 HYST REF V- V+ R1 R2 MAX9_1 MAX982 MAX9_3 2.5V TO 11V IREF Figure 3. Programming the HYST Pin |
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