+

LM2901

Vref

Vin

+

LM2901

Vin-

Vin+

LM139, LM239, LM339, LM139A

LM239A, LM339A, LM2901, LM2901AV, LM2901V

www.ti.com

SLCS006T – OCTOBER 1979 – REVISED JUNE 2015

9 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. Validate and test

the design implementation to confirm system functionality.

9.1 Application Information

Typically, the LMx39 compares either a single signal to a reference or two signals. 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 LMx39 optimal for level shifting to a higher or lower voltage.

9.2 Typical Application

Figure 7. 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

1 µA to 20 mA

Input Overdrive Voltage

100 mV

Reference Voltage

2.5 V

15 pF

9.2.2 Detailed Design Procedure

When using LMx39 in a general comparator application, determine the following:

•

Input voltage range

•

Minimum overdrive voltage

•

Output and drive current

•

Response time

9.2.2.1 Input Voltage Range

incorrect comparisons.

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