SNOS725E May   1999  – March 2025 LMC6462 , LMC6464

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information for LMC6462
    5. 5.5 Thermal Information for LMC6464
    6. 5.6 Electrical Characteristics for VS = ±2.25V or VS = 5V
    7. 5.7 Electrical Characteristics for VS = ±1.5V or VS = 3V
  7. 6 Typical Characteristics
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Input Common-Mode Voltage Range
      2. 7.1.2 Rail-to-Rail Output
      3. 7.1.3 Capacitive Load Tolerance
      4. 7.1.4 Compensating for Input Capacitance
      5. 7.1.5 Offset Voltage Adjustment
      6. 7.1.6 Instrumentation Circuits
    2. 7.2 Typical Applications
      1. 7.2.1 Transducer Interface Circuits
      2. 7.2.2 LMC646x as a Comparator
      3. 7.2.3 Half-Wave and Full-Wave Rectifiers
      4. 7.2.4 Precision Current Source
      5. 7.2.5 Oscillators
      6. 7.2.6 Low Frequency Null
    3. 7.3 Layout
      1. 7.3.1 Layout Guidelines
        1. 7.3.1.1 PCB Layout for High-Impedance Work
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Development Support
        1. 8.1.1.1 PSpice® for TI
    2. 8.2 Documentation Support
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • D|8
  • P|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.2.5 Oscillators

LMC6462 LMC6464 1Hz Square-Wave Oscillator Figure 7-18 1Hz Square-Wave Oscillator

For single supply 5V operation, the output of the circuit swings from 0V to 5V. The voltage divider set up by R2, R3 and R4 cause the noninverting input of the LMC646x to move from 1.67V (1/3 of 5V) to 3.33V (2/3 of 5V). This voltage behaves as the threshold voltage.

R1 and C1 determine the time constant of the circuit. The frequency of oscillation, fOSC, is:

Equation 4. 12∆t

where

  • Δt = time the amplifier input takes to move from 1.67V to 3.33V.

The calculations are as follows:

Equation 5. 1.67 = 5 1 - e - t 1 τ

where

  • τ = RC = 0.68 seconds
  • t1 = 0.27 seconds.

and

Equation 6. 3.33 = 5 1 - e - t 2 τ

where

  • t2 = 0.75 seconds

Then,

Equation 7. fOSC=12∆t=120.75 -0.27≅1Hz