SNAS555D June   2000  – December 2016 LM2907-N , LM2917-N

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Parameter Measurement Information
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Differential Input
      2. 9.3.2 Configurable
      3. 9.3.3 Output Stage
    4. 9.4 Device Functional Modes
      1. 9.4.1 Grounded Input Devices (8-Pin LM2907 and LM2917)
      2. 9.4.2 Differential Input Devices (LM2907 and LM2917)
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Applications
      1. 10.2.1 Minimum Component Tachometer
        1. 10.2.1.1 Design Requirements
        2. 10.2.1.2 Detailed Design Procedure
          1. 10.2.1.2.1 Choosing R1 and C1
          2. 10.2.1.2.2 Using Zener Regulated Options (LM2917)
        3. 10.2.1.3 Application Curves
      2. 10.2.2 Other Application Circuits
        1. 10.2.2.1 Variable Reluctance Magnetic Pickup Buffer Circuits
        2. 10.2.2.2 Finger Touch or Contact Switch
        3. 10.2.2.3 Over-Speed Latch
        4. 10.2.2.4 Frequency Switch Applications
          1. 10.2.2.4.1 Application Curves
        5. 10.2.2.5 Anti-Skid Circuits
          1. 10.2.2.5.1 Select-Low Circuit
          2. 10.2.2.5.2 Select-High Circuit
          3. 10.2.2.5.3 Select-Average Circuit
        6. 10.2.2.6 Changing the Output Voltage for an Input Frequency of Zero
        7. 10.2.2.7 Changing Tachometer Gain Curve or Clamping the Minimum Output Voltage
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Related Links
    2. 13.2 Receiving Notification of Documentation Updates
    3. 13.3 Community Resources
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

12 Layout

12.1 Layout Guidelines

  • Bypass capacitors must be placed as close as possible to the supply pin. When using a through-hole package, it is acceptable to place the bypass capacitor on the bottom layer. All other components must be placed as close to the device as possible.
  • Use of a ground plane is recommended to provide a low-impedance ground across the circuit.
  • Feedback loops must use short and wide traces.

12.2 Layout Example

LM2907-N LM2917-N layout_SNAS555.gif Figure 48. Layout Recommendation