INA821 datasheet(16/36 Pages) TI

tên linh kiện	INA821

Giải thích chi tiết về linh kiện	INA849 Ultra-Low-Noise (1 nV/?숰z), High-Bandwidth, Instrumentation Amplifier

PDF	36 Pages

Scroll/Zoom	100%

nhà sản xuất	TI [Texas Instruments]

Trang chủ	http://www.ti.com

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16 / 36 page

8 Detailed Description

8.1 Overview

The INA849 is a monolithic, precision, instrumentation amplifier that incorporates a current-feedback input stage

and a four-resistor difference amplifier output stage. The functional block diagram in the next section shows how

the differential input voltage is buffered by Q1 and Q2, and is forced across RG, which causes a signal current to

flow through RG, R1, and R2. The output difference amplifier, A3, removes the common-mode component of the

input signal and refers the output signal to the REF pin. The VBE and voltage drop across R1 and R2 produce

output voltages on A1 and A2 that are approximately 0.8 V lower than the input voltages.

8.2 Functional Block Diagram

3 k

+VS

íVS

+VS

íVS

+VS

íVS

+VS

íVS

+VS

Super-

NPN

Super-

NPN

+VS

íIN

+IN

REF

OUT

+VS

IB Cancellation

3 k

íVS

5 k

INA849

SBOS945A – NOVEMBER 2020 – REVISED DECEMBER 2020

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INA821 bảng dữ liệu(PDF) 16 Page - Texas Instruments