Measurement Computing DBK45 - Manual (Page 4)

The right-hand figure shows the DIP-16
component pattern typical of the 4 filter sections.
Note: “n” corresponds to “channel number.”
Pin 7 of the DIP-16 socket:
• connects to pin 8 for low-pass filtering
• connects to pin 6 for band-pass filtering
DIP-16 Component Pattern
The following table lists values of components for common corner frequencies in Butterworth filters. If
designing your own filter, software from Burr-Brown provides the component values to create the desired
filter. Note that the design math is beyond the scope of this manual.
3-Pole Butterworth Filter Components
3dB
(Hz)
RCnA RCnB RCnC RCnD RcnE RCnF RCnG RCnH
0.05 3.16 M Ω 1 µF none 3.16 M Ω 1 µF 3.16 M Ω none 1 µF
0.10 1.58 M
Ω 1 µF none 1.58 M
Ω 1 µF 1.58 M
Ω none 1 µF
0.20 787 k Ω 1 µF none 787 k Ω 1 µF 787 k Ω none 1 µF
0.50 3.16 M
Ω 0.1 µF none 3.16 M
Ω 0.1 µF 3.16 M
Ω none 0.1 µF
1 1.58 M
Ω 0.1 µF none 1.58 M
Ω 0.1 µF 1.58 M
Ω none 0.1 µF
2 787 k Ω 0.1 µF none 787 k Ω 0.1 µF 787 k Ω none 0.1 µF
5* 3.16 M
Ω 0.01 µF none 3.16 M
Ω 0.01 µF 3.16 M
Ω none 0.01 µF
10* 1.58 M Ω 0.01 µF none 1.58 M Ω 0.01 µF 1.58 M Ω none 0.01 µF
20 787 k
Ω 0.01 µF none 787 k
Ω 0.01 µF 787 k
Ω none 0.01 µF
50 3.16 M Ω 0.001 µF none 3.16 M Ω none 3.16 M Ω none none
100* 1.58 M
Ω 0.001 µF none 1.58 M
Ω none 1.58 M
Ω none none
200 787 k Ω 0.001 µF none 787 k Ω none 787 k Ω none none
500* 316 k
Ω 0.001 µF none 316 k
Ω none 316 k
Ω none none
1000* 158 k
Ω 0.001 µF none 158 k
Ω none 158 k
Ω none none
2000 78.7 k Ω 0.001 µF none 78.7 k Ω none 78.7 k Ω none none
5000 31.6 k
Ω 0.001 µF none 31.6 k
Ω none 31.6 k
Ω none none
10000 15.8 k Ω 0.001 µF none 15.8 k Ω none 15.8 k Ω none none
*These pre-configured Butterworth frequency modules are available from the manufacturer.
You have the option to configure the filter sections as band-pass filters rather than low-pass filters. The
component selection program provides band-pass component values. The program also computes and
displays phase and gain characteristics of the filter sections as a function of frequency.
DBK45, pg. 4 987696 DBK Option Cards and Modules