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LM2903QDRG4Q1 Datenblatt(PDF) 6 Page - Texas Instruments |
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LM2903QDRG4Q1 Datenblatt(HTML) 6 Page - Texas Instruments |
6 / 21 page 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 Submit Documentation Feedback Copyright © 2003–2014, Texas Instruments Incorporated Product Folder Links: LM2903-Q1 |
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