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LTC1444IS Datasheet(PDF) 7 Page - Linear Technology |
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LTC1444IS Datasheet(HTML) 7 Page - Linear Technology |
7 / 12 page 7 LTC1443/LTC1444/LTC1445 OUT D (Pin 15): Comparator D Output. (Open-drain output for LTC1444). Output can source up to 40mA (LTC1443, LTC1445) and sink 5mA. OUT C (Pin 16): Comparator C Output. (Open-drain output for LTC1444). Output can source up to 40mA (LTC1443, LTC1445) and sink 5mA. The LTC1443/LTC1444/LTC1445 is a family of quad micropower comparators with a built-in reference (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 ability of the reference to drive up to a 0.01 µF capacitor without 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 ±1Vto±5.5V.ConnectingV–toGNDontheLTC1443 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 0.1 µF 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 during transi- tions 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 200 µA and sink up to 15µA with a 5V supply. The reference can drive a bypass capacitor of up to 0.01 µF without oscillation and by inserting a series resistor, capacitance values up to 100 µF 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 LTC1443/44/45 • F02 1 100 Figure 2. Damping Resistance vs Bypass Capacitor Value LTC144X V– REF R1 C1 REFERENCE OUTPUT LTC1443/44/45 • F01 Figure 1. Damping the Reference Output PI FU CTIO S APPLICATIO S I FOR ATIO |
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