SGLS007G February   2003  – August 2022 TLC2272-Q1 , TLC2272A-Q1 , TLC2274-Q1 , TLC2274A-Q1

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: VDD = 5 V (TLC2272-Q1 and TLC2272A-Q1)
    6. 6.6 Electrical Characteristics: VDD± = ±5 V (TLC2272-Q1 and TLC2272A-Q1)
    7. 6.7 Electrical Characteristics: VDD = 5 V (TLC2274-Q1 and TLC2274A-Q1)
    8. 6.8 Electrical Characteristics: VDD± = ±5 V (TLC2274-Q1 and TLC2274A-Q1)
    9. 6.9 Typical Characteristics
  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
      1. 8.1.1 Macromodel Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Differential Amplifier Equations
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  9. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Development Support
        1. 9.1.1.1 PSpice® for TI
        2. 9.1.1.2 TINA-TI™ Simulation Software (Free Download)
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  10. 10Mechanical, Packaging, and Orderable Information

Package Options

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

8.2.2.1 Differential Amplifier Equations

Equation 1 and Equation 2 are used to calculate VOUT.

Equation 1. GUID-810452B7-72AD-4EA8-BB94-8C02EFAF0332-low.gif
Equation 2. GUID-144FB1CE-29C7-4CEB-9AF9-2678568586BE-low.gif

In an ideal case, Equation 3 then calculates R1 = R and R2 = Rg, and VOUT:

Equation 3. GUID-684E8880-CA77-47E7-9686-5177EC701CBA-low.gif

However, the resistors have tolerances; therefore, the resistors cannot be perfectly matched.

R1 = R ± ΔR1

R2 = R2 ± ΔR2

R = R ± ΔR

Rg = Rg ± ΔRg

Equation 4. GUID-5DCA07BB-0002-4EA4-8B1E-D68785C27C34-low.gif

Equation 5 shows that by developing the equations and neglecting the second order, the worst case is when the tolerances add up:

Equation 5. GUID-B6449B63-8A5D-4CF0-9F6E-6A13A64131C0-low.gif

where

  • Tol = 0.01 for 1%
  • Tol = 0.001 for 0.1%

If the resistors are perfectly matched, then Tol = 0 and Equation 6 calculates VOUT:

Equation 6. GUID-AD30F3D4-BD2A-4516-8AF1-3AC02D9514D5-low.gif

The highest error is from the common mode:

Equation 7. GUID-909AC7F1-D17C-4FCD-927F-68862E816883-low.gif

Gain of 10, Rg / R = 10, and Tol = 1%:

Common mode error = ((4 × 0.01) / 1.1) × 12 V = 0.436 V

Gain of 10 and Tol = 0.1%:

Common mode error = 43.6 mV

The resistors were chosen from 2% batches.

R1 and R 12 kΩ

R2 and Rg 120 kΩ

Ideal Gain = 120 / 12 = 10

The measured value of the resistors:

R1 = 11.835 kΩ

R = 11.85 kΩ

R2 = 117.92 kΩ

Rg = 118.07 kΩ