データシートサーチシステム |
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INA819 データシート(PDF) 29 Page - Texas Instruments |
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INA819 データシート(HTML) 29 Page - Texas Instruments |
29 / 43 page TI Device 47 kW 47 kW TI Device 10 kW Microphone, Hydrophone, and So Forth Thermocouple TI Device Center tap provides bias current return. Copyright © 2017, Texas Instruments Incorporated 29 INA819 www.ti.com SBOS959 – DECEMBER 2018 Product Folder Links: INA819 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated Application Information (continued) 9.1.2 Input Bias Current Return Path The input impedance of the INA819 is extremely high—approximately 100 GΩ. However, a path must be provided for the input bias current of both inputs. This input bias current is typically 150 pA. High input impedance means that this input bias current changes very little with varying input voltage. For proper operation, input circuitry must provide a path for input bias current. Figure 68 shows various provisions for an input bias current path. Without a bias current path, the inputs float to a potential that exceeds the common-mode range of the INA819 and the input amplifiers saturate. If the differential source resistance is low, the bias current return path can connect to one input (as shown in the thermocouple example in Figure 68). With a higher source impedance, using two equal resistors provides a balanced input with possible advantages of a lower input offset voltage as a result of bias current and better high-frequency common-mode rejection. Figure 68. Providing an Input Common-Mode Current Path |
同様の部品番号 - INA819 |
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同様の説明 - INA819 |
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