AD628 datasheet(18/20 Pages) AD

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AD628

Rev. C | Page 18 of 20

FILTER CAPACITOR VALUES

A capacitor may be connected to Pin 4 (CFILT) to implement a

low-pass filter. The capacitor value is

()

μF

15.9/ tf

C =

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 interconnecting

wiring. The AD628 is particularly suited for this type of

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

feedback to match the source impedance of A2, which 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

10k

Ω

10k

Ω

10k

Ω

100k

Ω

100k

Ω

VS/2

CFILT

10k

Ω

Figure 35. Kelvin Connection

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