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INA819 データシート(PDF) 29 Page - Texas Instruments

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部品番号 INA819
部品情報  35-關V Offset, 8-nV/?숰z Noise, Low-Power Precision Instrumentation Amplifier
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI1 - Texas Instruments

INA819 データシート(HTML) 29 Page - Texas Instruments

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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


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