ZHCSH47 November   2017 INA317

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      简化原理图
  4. 4 修订历史记录
  5. 5 Pin Configuration and Functions
    1.     Pin 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
    6. 6.6 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
      1. 7.4.1 Internal Offset Correction
      2. 7.4.2 Input Common-Mode Range
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1  Setting the Gain
        2. 8.2.2.2  Internal Offset Correction
        3. 8.2.2.3  Offset Trimming
        4. 8.2.2.4  Noise Performance
        5. 8.2.2.5  Input Bias Current Return Path
        6. 8.2.2.6  Input Common-Mode Range
        7. 8.2.2.7  Operating Voltage
        8. 8.2.2.8  Low Voltage Operation
        9. 8.2.2.9  Single-Supply Operation
        10. 8.2.2.10 Input Protection
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11器件和文档支持
    1. 11.1 器件支持
      1. 11.1.1 开发支持
        1. 11.1.1.1 TINA-TI（免费下载软件）
    2. 11.2 文档支持
      1. 11.2.1 相关文档
    3. 11.3 商标
    4. 11.4 静电放电警告
    5. 11.5 Glossary
  12. 12机械、封装和可订购信息

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

8.2.2.1 Setting the Gain

A single external resistor (RG) that is connected between pins 1 and 8 sets the gain of the INA317. The value of RG is selected according to Equation 1:

Equation 1. G = 1 + (100 kΩ / RG)

Table 1 lists several commonly-used gains and resistor values. The 100 kΩ in Equation 1 is a result of the sum of the two internal feedback resistors (A1 and A2.) These on-chip resistors are laser trimmed to accurate absolute values. The accuracy and temperature coefficient of these resistors are included in the gain accuracy and drift specifications of the INA317 device.

The stability and temperature drift of the external gain setting resistor (RG) also affects gain. The contribution of RG to gain accuracy and drift is inferred from the gain inEquation 1. Low resistor values required for high gain make wiring resistance important. Sockets add to the wiring resistance and contribute additional gain error (possibly an unstable gain error) in gains of approximately 100 or greater. To ensure stability, avoid parasitic capacitance of more than a few picofarads at the RG connections. Careful matching of any parasitics on RG pins maintains optimal CMRR over frequency.

Table 1. Commonly-Used Gains and Resistor Values

DESIRED GAINRG (Ω)NEAREST 1% RG (Ω)
1 NC(1) NC
2 100 k 100 k
5 25 k 24.9 k
10 11.1 k 11 k
20 5.26 k 5.23 k
50 2.04 k 2.05
100 1.01 k 1 k
200 502.5 499
500 200.4 200
1000 100.1 100
(1) NC denotes no connection. When using the SPICE model, the simulation does not converge unless a resistor is connected to the RG pins; use a large resistor value.