V

SUP

V

xIN+

V

REF

+

C

L

R

PULLUP

V

LOGIC

–

½ LM2901x-Q1

V

xIN+

V

xIN–

C

L

R

PULLUP

–

½ LM2901x-Q1

V

SUP

V

LOGIC

Copyright © 2016, Texas Instruments Incorporated

8

LM2901-Q1, LM2901V-Q1, LM2901AV-Q1

SLCS142E – DECEMBER 2003 – REVISED MAY 2016

www.ti.com

Product Folder Links: LM2901-Q1 LM2901V-Q1 LM2901AV-Q1

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Copyright © 2003–2016, Texas Instruments Incorporated

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The LM2901x-Q1 family of devices is typically 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 the

LM2901x-Q1 family of devices optimal for level shifting to a higher or lower voltage.

8.2 Typical Application

Figure 4. Single-Ended and Differential Comparator Configurations

8.2.1 Design Requirements

For this design example, use the parameters listed in Table 1 as the input parameters.

Table 1. Design Parameters

PARAMETER

EXAMPLE VALUE

Input voltage range

Supply voltage

2 V to 36 V

Logic supply voltage

2 V to 36 V

1 µA to 20 mA

Input overdrive voltage

100 mV

Reference voltage

2.5 V

15 pF

8.2.2 Detailed Design Procedure

8.2.2.1 Input Voltage Range

incorrect comparisons.

The following lists some input voltage scenarios and the resulting outcomes:

•

When both IN– and IN+ are both within the common-mode range:

–

If IN– is higher than IN+ and the offset voltage, then the output is low and the output transistor is sinking

current.