SNOSBJ3E November   1999  – December 2014 LM139-N , LM239-N , LM2901-N , LM339-N

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics: LM139A, LM239A, LM339A, LM139
    6. 6.6 Electrical Characteristics: LM239, LM339, LM2901, LM3302
    7. 6.7 Typical Characteristics
      1. 6.7.1 LM139/LM239/LM339, LM139A/LM239A/LM339A, LM3302
      2. 6.7.2 LM2901
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Basic Comparator
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Application Curve
      2. 8.2.2 System Examples
        1. 8.2.2.1 Split-Supply Applications
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Related Links
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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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 LM139-N is specified for operation from 2.0 V to 36 V (±1V to ±18V) over the temperature range of –55°C to 125°C. While it may seem like a comparator has a well-defined and somewhat limited functionality as a '1-bit ADC', a comparator is a versatile component which can be used for many functions.

Refer to AN-74 LM139/LM239/LM339 A Quad of Independently Functioning Comparators (SNOA654) for additional application information on use of the LM139-N.

8.2 Typical Applications

8.2.1 Basic Comparator

00570603.pngFigure 11. Basic Comparator Schematic

8.2.1.1 Design Requirements

The basic usage of a comparator is to indicate when a specific analog signal has exceeded some predefined threshold. In this application, the negative input is tied to a reference voltage, and the positive input is connected to the input signal. The output is pulled up with a resistor to the logic supply voltage, V+.

For an example application, the supply voltage is 5 V. The input signal varies between 1 V and 3 V, and we want to know when the input exceeds 2.5 V. For this example, we would set the VREF to 2.5 V.

8.2.1.2 Application Curve

appcurve_lm139n.pngFigure 12. Basic Comparator Response

8.2.2 System Examples

00570604.png
Figure 13. Driving CMOS
(V+ = 5.0 VDC)
00570608.png
Figure 15. AND Gate
(V+ = 5.0 VDC)
00570605.png
Figure 14. Driving TTL
(V+ = 5.0 VDC)
00570609.png
Figure 16. OR Gate
(V+ = 5.0 VDC)
00570610.png
Figure 17. One-Shot Multivibrator
(V+= 15 VDC)
00570612.png
Figure 19. One-Shot Multivibrator with Input Lock Out
(V+= 15 VDC)
00570613.png
Figure 21. Large Fan-In AND Gate
(V+= 15 VDC)
00570614.png
Figure 23. Time Delay Generator
(V+= 15 VDC)
00570619.png
Figure 25. Inverting Comparator With Hysteresis
(V+= 15 VDC)
00570621.png
Figure 27. Basic Comparator
(V+= 15 VDC)
00570620.png
Figure 29. Comparing Input Voltages of Opposite Polarity
(V+= 15 VDC)
00570611.png
Figure 18. Bi-Stable Multivibrator
(V+= 15 VDC)
00570617.png
Figure 20. Pulse Generator
(V+= 15 VDC)
00570615.png
Figure 22. ORing the Outputs
(V+= 15 VDC)
00570618.png
Figure 24. Non-Inverting Comparator with Hysteresis
(V+= 15 VDC)
00570616.png
Figure 26. Squarewave Oscillator
(V+= 15 VDC)
00570624.png
Figure 28. Limit Comparator
(V+= 15 VDC)
00570622.png
* Or open-collector logic gate without pullup resistor
Figure 30. Output Strobing
(V+= 15 VDC)
00570625.png
Figure 31. Crystal Controlled Oscillator
(V+= 15 VDC)
00570628.png
Figure 33. Transducer Amplifier
(V+= 15 VDC)
00570623.png
250 mVDC ≤ VC ≤ +50 VDC
700 Hz ≤ fO ≤ 100 kHz
Figure 32. Two-Decade High-Frequency VCO
V+ = +30 VDC
00570630.png
Figure 34. Zero Crossing Detector (Single Power Supply)
(V+= 15 VDC)

8.2.2.1 Split-Supply Applications

00570631.png
Figure 35. MOS Clock Driver
(V+ = +15 VDC and V− = −15 VDC)
00570633.png
Figure 37. Comparator With a Negative Reference
(V+ = +15 VDC and V− = −15 VDC)
00570632.png
Figure 36. Zero Crossing Detector
(V+ = +15 VDC and V− = −15 VDC)
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