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LM2903QDRQ1 数据表(PDF) 6 Page - Texas Instruments

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部件名 LM2903QDRQ1
功能描述  LM2903-Q1 Dual Differential Comparators
Download  18 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LM2903QDRQ1 数据表(HTML) 6 Page - Texas Instruments

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80- A
µ
Current Regulator
80 µA
60 µA
10 µA
VCC
10 µA
OUT
GND
IN+
IN−
Epi-FET
Diodes
Resistors
Transistors
COMPONENT COUNT
1
2
2
30
LM2903-Q1
SLCS141E – MAY 2003 – REVISED JULY 2014
www.ti.com
8 Detailed Description
8.1 Overview
The LM2903 is a dual comparator with the ability to operate up to 36 V on the supply pin. This standard device
has proven ubiquity and versatility across a wide range of applications. This is due to it's very wide supply
voltages range (2 V to 36 V), low Iq and fast response.
This device is Q100 qualified and can operate over a wide temperature range (–40°C to 125°C).
The open-drain output allows the user to configure the output's logic low voltage (VOL) and can be utilized to
enable the comparator to be used in AND functionality.
8.2 Functional Block Diagram
Figure 4. Schematic (Each Comparator)
8.3 Feature Description
LM2903 consists of a PNP darlington pair input, allowing the device to operate with very high gain and fast
response with minimal input bias current. The input Darlington pair creates a limit on the input common mode
voltage capability, allowing LM2903 to accurately function from ground to VCC–1.5V differential input. This is
enables much head room for modern day supplies of 3.3 V & 5.0 V.
The output consists of an open drain NPN (pull-down or low side) transistor. The output NPN will sink current
when the positive input voltage is higher than the negative input voltage and the offset voltage. The VOL is
resistive and will scale with the output current. Please see Figure 2 in the Typical Characteristics section for VOL
values with respect to the output current.
8.4 Device Functional Modes
8.4.1 Voltage Comparison
The LM2903-Q1 operates solely as a voltage comparator, comparing the differential voltage between the positive
and negative pins and outputting a logic low or high impedance (logic high with pull-up) based on the input
differential polarity.
6
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Copyright © 2003–2014, Texas Instruments Incorporated
Product Folder Links: LM2903-Q1


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