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LM2903N 데이터시트(PDF) 10 Page - Texas Instruments

부품명 LM2903N
상세설명  Low-Power, Low-Offset Voltage, Dual Comparators
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LM193-N, LM2903-N, LM293-N, LM393-N
SNOSBJ6F – OCTOBER 1999 – REVISED DECEMBER 2014
www.ti.com
8 Detailed Description
8.1 Overview
The LM139 provides two independently functioning, high-precision, low VOS drift, low input bias current
comparators in a single package. The low power consumption of 0.4mA at 5V and the 2.0V supply operation
makes the LM139 suitable for battery powered applications.
8.2 Functional Block Diagram
Figure 11. Basic Comparator
8.3 Feature Description
The input bias current of 25 nA enables the LM193 to use even very high impedance nodes as inputs. The
differential voltage input range equals the supply voltage range.
The LM193 can be operated with a single supply, where V+ can be from 2.0 V to 36 V, or in a dual supply
voltage configuration, where GND pin is used as a V– supply. The supply current draws only 0.4 mA for both
comparators.
The output of each comparator in the LM193 is the open collector of a grounded-emitter NPN output transistor
which can typically draw up to 16mA.
8.4 Device Functional Modes
A basic comparator circuit is used for converting analog signals to a digital output. The output is HIGH when the
voltage on the non-inverting (+IN) input is greater than the inverting (-IN) input. The output is LOW when the
voltage on the non-inverting (+IN) input is less than the inverting (-IN) input. The inverting input (-IN) is also
commonly referred to as the "reference" or "VREF" input. All pins of any unused comparators should be tied to
the negative supply.
10
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Product Folder Links: LM193-N LM2903-N LM293-N LM393-N


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