AD620BRZ-R7 datasheet(18/20 Pages) AD

Nome de Peças	AD620BRZ-R7

Descrição Electrónicos	Low Cost Low Power Instrumentation Amplifier

PDF	20 Pages

Scroll/Zoom	100%

Fabricante Electrônico	AD [Analog Devices]

Página de início	http://www.analog.com

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18 / 20 page

AD620

Rev. G | Page 18 of 20

GROUND RETURNS FOR INPUT BIAS CURRENTS

Input bias currents are those currents necessary to bias the

input transistors of an amplifier. There must be a direct return

path for these currents. Therefore, when amplifying “floating”

input sources, such as transformers or ac-coupled sources, there

must be a dc path from each input to ground, as shown in

Figure 47, Figure 48, and Figure 49. Refer to A Designer’s Guide

to Instrumentation Amplifiers (free from Analog Devices) for

more information regarding in-amp applications.

VOUT

AD620

– INPUT

TO POWER

SUPPLY

GROUND

REFERENCE

+ INPUT

+VS

–VS

LOAD

Figure 47. Ground Returns for Bias Currents with Transformer-Coupled Inputs

VOUT

– INPUT

+ INPUT

LOAD

TO POWER

SUPPLY

GROUND

REFERENCE

+VS

–VS

AD620

Figure 48. Ground Returns for Bias Currents with Thermocouple Inputs

100k

Ω

VOUT

AD620

– INPUT

+ INPUT

LOAD

TO POWER

SUPPLY

GROUND

REFERENCE

100k

Ω

–VS

+VS

Figure 49. Ground Returns for Bias Currents with AC-Coupled Inputs

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