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LTC1443 Datasheet(PDF) 8 Page - Linear Technology |
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LTC1443 Datasheet(HTML) 8 Page - Linear Technology |
8 / 14 page LTC1443/LTC1444/LTC1445 8 144345fe applicaTions inForMaTion The LTC1443/LTC1444/LTC1445 is a family of quad micropowercomparatorswithabuilt-inreference(1.182V for the LTC1443 and 1.221V for the LTC1444/LTC1445). Features include programmable hysteresis (LTC1444/ LTC1445), wide supply voltage range (2V to 11V) and the abilityofthereferencetodriveuptoa0.01µFcapacitorwith- out oscillation. The comparator CMOS outputs (LTC1443/ LTC1445) can source up to 40mA while the LTC1444 has an open-drain output to V–. The supply current glitches that normally occur when the comparator output switches states have been eliminated. Power Supplies The comparator family operates from a single 2V to 11V supply. The LTC1443 includes a separate ground for the comparator output stage, allowing a split supply ranging from ±1V to ±5.5V. Connecting V– to GND on the LTC1443 allows single supply operation. If the comparator output is required to source more than 1mA or the supply source impedance is high, V+ should be bypassed with a 0.1µF capacitor. Comparator Inputs The comparator inputs can swing from the negative sup- ply (V–) to within 1.3V maximum of the positive supply (V+). The inputs can be forced 300mV below V– or above V+ without damage, and the typical input leakage current is only ±10pA. Comparator Outputs The LTC1443 comparator output swings between GND and V+ to assure TTL compatibility with a split supply. The LTC1444 and LTC1445 outputs swing between V– and V+. The outputs are capable of sourcing up to 40mA (LTC1443/LTC1445) and sinking up to 5mA while still maintaining microampere quiescent currents. The output stage does not generate crowbar switching currents dur- ing transitions which helps minimize parasitic feedback through the supply pins. Voltage Reference The internal bandgap reference has a voltage of 1.182V for LTC1443 or 1.221V for LTC1444/LTC1445 referenced to V–. The reference accuracy is 1.5% from –40°C to 85°C. It can source up to 200µA and sink up to 15µA with a 5V supply. The reference can drive a bypass capacitor of up to 0.01µFwithoutoscillationandbyinsertingaseriesresistor, capacitance values up to 100µF can be used (Figure 1). Figure 2 shows the resistor value required for different capacitor values to achieve critical damping. CAPACITOR VALUE (µF) 0.001 0.1 10 1000 0.01 0.1 10 1 144345 F02 1 100 Figure 2. Damping Resistance vs Bypass Capacitor Value LTC144X V– REF R1 C1 REFERENCE OUTPUT 144345 F01 1.2V +– Figure 1. Damping the Reference Output |
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