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LM2903QDRQ1 数据表(PDF) 7 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) 7 Page - Texas Instruments

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+
½ LM2903
VLOGIC
VSUP
Vref
Vin
+
½ LM2903
Vin-
Vin+
Rpullup
Rpullup
VLOGIC
VSUP
CL
CL
LM2903-Q1
www.ti.com
SLCS141E – MAY 2003 – REVISED JULY 2014
9 Application and Implementation
9.1 Application Information
LM2903Q1 will typically be used to compare a single signal to a reference or two signals against each other.
Many users take advantage of the open drain output to drive the comparison logic output to a logic voltage level
to an MCU or logic device. The wide supply range and high voltage capability makes LM2903Q1 optimal for level
shifting to a higher or lower voltage.
9.2 Typical Application
Figure 5. Single-ended and Differential Comparator Configurations
9.2.1 Design Requirements
For this design example, use the parameters listed in Table 1 as the input parameters.
Table 1. Design Parameters
DESIGN PARAMETER
EXAMPLE VALUE
Input Voltage Range
0 V to Vsup-1.5 V
Supply Voltage
2 V to 36 V
Logic Supply Voltage
2 V to 36 V
Output Current (RPULLUP)
1 µA to 20 mA
Input Overdrive Voltage
100 mV
Reference Voltage
2.5 V
Load Capacitance (CL)
15 pF
9.2.2 Detailed Design Procedure
When using LM2903-Q1 in a general comparator application, determine the following:
Input Voltage Range
Minimum Overdrive Voltage
Output & Drive Current
Response Time
9.2.2.1 Input Voltage Range
When choosing the input voltage range, the input common mode voltage range (VICR) must be taken in to
account. If temperature operation is above or below 25°C the VICR can range from 0 V to VCC–2.0V. This limits
the input voltage range to as high as VCC–2.0V and as low as 0 V. Operation outside of this range can yield
incorrect comparisons.
Below is a list of input voltage situation and their outcomes:
1. When both IN- & IN+ are both within the common mode range:
(a) If IN- is higher than IN+ and the offset voltage, the output is low and the output transistor is sinking
current
(b) If IN- is lower than IN+ and the offset voltage, the output is high impedance and the output transistor is
not conducting
Copyright © 2003–2014, Texas Instruments Incorporated
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