DocID023777 Rev 2

9/19

AN4184

Schematic hints

19

Method 2

Figure 10. Matching the PCB line - microphone side

This solution is the same as that presented in Method 1, but concerns the microphone side.

It is a very easy solution to implement as well but can introduce non-negligible extra power

consumption. It also causes asymmetrical rising and falling clock edges.

Method 3

Two resistors:

Figure 11. Matching the PCB line - microphone side (using two resistors)

The solution in Method 3 is very similar to Method 2. This is impedance matching on the

microphone side done with two resistors, allowing less power consumption and symmetrical

rising and falling edges of the clock, however the number of components represents a

drawback.

R

1

R

2



R

1

R

2

+

--------------------

Z

0

=