WM8993 datasheet(219/229 Pages) WOLFSON

219 / 229 page

Production Data

WM8993

PD, November 2010, Rev 4.0

219

10101

+15.0

11.9

6.5

10110

+16.5

10.3

5.6

10111

+18.0

8.9

4.8

11000

+19.5

7.7

4.1

11001

+21.0

6.6

3.5

11010

+22.5

5.6

2.9

11011

+24.0

4.8

2.5

11100

+25.5

4.1

2.1

11101

+27.0

3.5

1.8

11110

+28.5

2.9

1.5

11111

+30.0

2.5

1.3

Table 114 PGA Input Pin Resistance

The appropriate input capacitor may be selected using the PGA input resistance data provided in

Table 114, depending on the required PGA gain setting(s).

The choice of capacitor for a 20Hz cut-off frequency is shown in Table 115 for a selection of typical

input impedance conditions.

INPUT IMPEDANCE

MINIMUM CAPACITANCE

FOR 20HZ PASS BAND

μF

15k

0.5

μF

30k

0.27

μF

60k

0.13

μF

Table 115 Audio Input DC Blocking Capacitors

Using the figures in Table 115, it follows that a 1

μF capacitance for all input connections will give

good results in most cases. Tantalum electrolytic capacitors are particularly suitable as they offer

high stability in a small package size.

Ceramic equivalents are a cost effective alternative to the superior tantalum packages, but care must

be taken to ensure the desired capacitance is maintained at the AVDD1 operating voltage. Also,

ceramic capacitors may show microphonic effects, where vibrations and mechanical conditions give

rise to electrical signals. This is particularly problematic for microphone input paths where a large

signal gain is required.

A single capacitor is required for a line input or single-ended microphone connection. In the case of a

differential microphone connection, a DC blocking capacitor is required on both input pins.

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