SLOS180D February   1997  – April 2026 TL031 , TL032 , TL032A , TL034 , TL034A

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  Thermal Information
    3. 5.3  Recommended Operating Conditions
    4. 5.4  TL031C and TL031AC Electrical Characteristics
    5. 5.5  TL031C and TL031AC Operating Characteristics
    6. 5.6  TL031I and TL031AI Electrical Characteristics
    7. 5.7  TL031I and TL031AI Operating Characteristics
    8. 5.8  TL032C and TL032AC Electrical Characteristics
    9. 5.9  TL032C and TL032AC Operating Characteristics
    10. 5.10 TL032I and TL032AI Electrical Characteristics
    11. 5.11 TL032I and TL032AI Operating Characteristics
    12. 5.12 TL034C and TL034AC Electrical Characteristics
    13. 5.13 TL034C and TL034AC Operating Characteristics
    14. 5.14 TL034I and TL034AI Electrical Characteristics
    15. 5.15 TL034I and TL034AI Operating Characteristics
    16. 5.16 Typical Characteristics
  7. 6 Parameter Measurement Information
    1. 6.1 Typical Values
    2. 6.2 Input Bias and Offset Current
    3. 6.3 Noise
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Input Characteristics
      2. 7.1.2 Output Characteristics
      3. 7.1.3 Transimpedance Amplifier
      4. 7.1.4 4mA to 20mA Current Loops
      5. 7.1.5 Instrumentation Amplifier with Linear Gain Adjust
  9. 8 Device and Documentation Support
    1. 8.1 Receiving Notification of Documentation Updates
    2. 8.2 Support Resources
    3. 8.3 Trademarks
    4. 8.4 Electrostatic Discharge Caution
    5. 8.5 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

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  • P|8
  • PS|8
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订购信息

7.1.3 Transimpedance Amplifier

The low-power precision TL03x allows accurate measurement of low currents. The high input impedance and low offset voltage of the TL03xA greatly simplify the design of a transimpedance amplifier. At room temperature, this design achieves 10-bit accuracy with an error of less than 1/2 LSB.

Assuming that R2 is much less than R1 and ignoring error terms, the output voltage can be expressed as:

TL031 TL031A TL032 TL032A TL034 TL034A

Using the resistor values shown in the schematic for a 1nA input current, the output voltage equals −0.1V. If the VO limit for the TL03xA is measured at ±12V, the maximum input current for these resistor values is ±120nA. Similarly, one LSB on a 10-bit scale corresponds to 12mV of output voltage, or 120pA of input current.

The following equation shows the effect of input offset voltage and input bias current on the output voltage:

TL031 TL031A TL032 TL032A TL034 TL034A

If the application requires input protection for the transimpedance amplifier, do not use standard PN diodes. Instead, use low-leakage Siliconix SN4117 FETs (or equivalent) connected as diodes across the TL03xA inputs (see Figure 7-4).

As with all precision applications, special care must be taken to eliminate external sources of leakage and interference. Other precautions include using high-quality insulation, cleaning insulating surfaces to remove fluxes and other residue, and enclosing the application within a protective box.

TL031 TL031A TL032 TL032A TL034 TL034A Transimpedance Amplifier Figure 7-4 Transimpedance Amplifier