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LMC7221BIMX Datasheet(PDF) 6 Page - National Semiconductor (TI) |
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LMC7221BIMX Datasheet(HTML) 6 Page - National Semiconductor (TI) |
6 / 12 page Typical Performance Characteristics (Continued) Application Information 1.0 Benefits of the LMC7221 Tiny Comparator Size. The small footprint of the SOT 23-5 packaged Tiny Comparator, (0.120 x 0.118 inches, 3.05 x 3.00 mm) saves space on printed circuit boards, and enable the design of smaller electronic products. Because they are easier to carry, many customers prefer smaller and lighter products. Height. The height (0.056 inches, 1.43 mm) of the Tiny Comparator makes it possible to use it in PCMCIA type III cards. Simplified Board Layout. The Tiny Comparator can sim- plify board layout in several ways. First, by placing a com- parator where comparators are needed, instead of routing signals to a dual or quad device, long pc traces may be avoided. By using multiple Tiny Comparators instead of duals or quads, complex signal routing and possibly crosstalk can be reduced. Low Supply Current. The typical 7 µA supply current of the LMC7221 extends battery life in portable applications, and may allow the reduction of the size of batteries in some ap- plications. Wide Voltage Range. The LMC7221 is characterized at 15V, 5V and 2.7V. Performance data is provided at these popular voltages. This wide voltage range makes the LMC7221 a good choice for devices where the voltage may vary over the life of the batteries. Digital Outputs Representing Signal Level. Comparators provide a high or low digital output depending on the voltage levels of the (+) and (−) inputs. This makes comparators use- ful for interfacing analog signals to microprocessors and other digital circuits. The LMC7221 can be thought of as a one-bit a/d converter. Open Drain Output. The open drain output is like the open collector output of a logic gate. This makes the LMC7221 very useful for mixed voltage systems. Driving LEDs (Light Emitting Diodes). With a 5 volt power supply, the LMC7221’s output sinking current can drive small, high efficiency LEDs for indicator and test point cir- cuits. The small size of the Tiny package makes it easy to find space to add this feature to even compact designs. Input range to Beyond Rail to Rail. The input common mode range of the LMC7221 is slightly larger than the actual power supply range. This wide input range means that the comparator can be used to sense signals close to the power supply rails. This wide input range can make design easier by eliminating voltage dividers, amplifiers, and other front end circuits previously used to match signals to the limited input range of earlier comparators. This is useful to power supply monitoring circuits which need to sense their own power supply, and compare it to a reference voltage which is close to the power supply voltage. The wide input range can also be useful for sensing the voltage drop across a current sense resistor for battery chargers. Input Bias Current vs Common Mode Voltage DS012346-12 Input Bias Current vs Common Mode Voltage DS012346-13 Input Bias Current vs Temperature DS012346-14 Leakage Current vs Supply Voltage DS012346-15 www.national.com 6 |
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