AD628

Rev. G | Page 19 of 20

FILTER CAPACITOR VALUES

filter. The capacitor value is

Table 7 shows several frequencies and their closest standard

capacitor values.

Table 7. Capacitor Values for Various Filter Frequencies

Frequency (Hz)

Capacitor Value (μF)

10

1.5

50

0.33

60

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

A2

–IN

+IN

OUT

CIRCUIT

LOSS

LOAD

+IN

–IN

G = +0.1

A1

AD628

10kΩ

10kΩ

10kΩ

100kΩ

100kΩ

10kΩ

Figure 35. Kelvin Connection