SLOS351E February   2004  – November 2016 TLV271 , TLV272 , TLV274

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  Recommended Operating Conditions
    3. 7.3  Thermal Information: TLV271
    4. 7.4  Thermal Information: TLV272
    5. 7.5  Thermal Information: TLV274
    6. 7.6  Electrical Characteristics: DC Characteristics
    7. 7.7  Electrical Characteristics: Input Characteristics
    8. 7.8  Electrical Characteristics: Output Characteristics
    9. 7.9  Electrical Characteristics: Power Supply
    10. 7.10 Electrical Characteristics: Dynamic Performance
    11. 7.11 Electrical Characteristics: Noise/Distortion Performance
    12. 7.12 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Rail to Rail Output
      2. 8.3.2 Offset Voltage
      3. 8.3.3 Driving a Capacitive Load
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curve
    3. 9.3 System Examples
      1. 9.3.1 General Configurations
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Related Links
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Community Resource
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, 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
  • DGK|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information

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. Customers should validate and test their design implementation to confirm system functionality.

9.1 Application Information

The TLV27x family offers outstanding DC and AC performance. These devices operate up to a 16-V power supply and offer ultra-low input bias current and 3-MHz bandwidth. These features make the TLV27x a robust operational amplifier for battery-powered and industrial applications.

9.2 Typical Application

TLV271 TLV272 TLV274 Low_Pass_Filter_SBOS079.gif Figure 27. Second-Order, Low-Pass Filter

9.2.1 Design Requirements

  • Gain = 1 V/V
  • Low-pass cutoff frequency = 50 kHz
  • –40-db/dec filter response
  • Maintain less than 3-dB gain peaking in the gain versus frequency response

9.2.2 Detailed Design Procedure

The infinite-gain multiple-feedback circuit for a low-pass network function is shown in Figure 27. Use Equation 2 to calculate the voltage transfer function.

Equation 2. TLV271 TLV272 TLV274 App_EQ_1_SBOS165.gif

This circuit produces a signal inversion. For this circuit, the gain at DC and the low-pass cutoff frequency are calculated by Equation 3:

Equation 3. TLV271 TLV272 TLV274 App_EQ_2_SBOS165.gif

Software tools are readily available to simplify filter design. WEBENCH® Filter Designer is a simple, powerful, and easy-to-use active filter design program. The WEBENCH® Filter Designer lets you create optimized filter designs using a selection of TI operational amplifiers and passive components from TI's vendor partners.

Available as a web-based tool from the WEBENCH Design Center, WEBENCH Filter Designer allows you to design, optimize, and simulate complete multistage active filter solutions within minutes.

9.2.3 Application Curve

TLV271 TLV272 TLV274 D003_sbos079.gif Figure 28. TLV27x Second-Order, 50-kHz, Low-Pass Filter

9.3 System Examples

9.3.1 General Configurations

When receiving low-level signals, limiting the bandwidth of the incoming signals into the system is often required. The simplest way to accomplish this limiting is to place an RC filter at the noninverting terminal of the amplifier (see Figure 29 and Equation 4).

TLV271 TLV272 TLV274 ai_single-pole_low-pass_los351.gif Figure 29. Single-Pole Low-Pass Filter
Equation 4. TLV271 TLV272 TLV274 q_single-pole_low-pass_los351.gif

If even more attenuation is needed, a multiple pole filter is required. The Sallen-Key filter, shown in Figure 30, can be used for this task. For best results, the amplifier should have a bandwidth that is 8 to 10 times the filter frequency bandwidth; refer to Equation 5. Failure to use an amplifier with this characteristic can result in phase shift of the amplifier.

TLV271 TLV272 TLV274 ai_2-pole_low-pass-sallenkey_los351.gif Figure 30. Two-Pole, Low-Pass, Sallen-Key Filter
Equation 5. TLV271 TLV272 TLV274 q_two-pole_sallen-key_los351.gif