AD628ARM datasheet(19/20 Pages) AD

Il numero della parte	AD628ARM

Spiegazioni elettronici	High Common-Mode Voltage, Programmable Gain Difference Amplifier

PDF	20 Pages

Scroll/Zoom	100%

Produttore elettronici	AD [Analog Devices]

Homepage	http://www.analog.com

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19 / 20 page

AD628

Rev. G | Page 19 of 20

FILTER CAPACITOR VALUES

Connect a capacitor to Pin 4 (CFILT) to implement a low-pass

filter. The capacitor value is

C = 15.9/ft (μF)

where ft is the desired 3 dB filter frequency.

Table 7 shows several frequencies and their closest standard

capacitor values.

Table 7. Capacitor Values for Various Filter Frequencies

Frequency (Hz)

Capacitor Value (μF)

1.5

0.33

0.27

100

0.15

400

0.039

1 k

0.015

5 k

0.0033

10 k

0.0015

KELVIN CONNECTION

In certain applications, it may be desirable to connect the

inverting input of an amplifier to a remote reference point.

This eliminates errors resulting in circuit losses in inter-

connecting wiring. The AD628 is particularly suited for this

type of connection. In Figure 35, a 10 kΩ resistor added in the

feedback matches the source impedance of A2. This is

described in more detail in the Gain Adjustment section.

+IN

–IN

+VS

–IN

+IN

VREF

OUT

CIRCUIT

LOSS

LOAD

+IN

–IN

G = +0.1

AD628

–VS

10kΩ

100kΩ

VS/2

CFILT

10kΩ

Figure 35. Kelvin Connection

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