WM8904ECSSLASHR datasheet(38/188 Pages) WOLFSON

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WM8904

Pre-Production

PP, Rev 3.3, September 2012

SINGLE-ENDED INPUT

The Single-Ended PGA configuration is illustrated in Figure 21 for the Left channel. The available

gain in this mode is from -1.57dB to +28.5dB in non-linear steps. The input to the ADC is phase

inverted with respect to the selected input pin. Different input pins can be selected in the same mode

by altering the L_IP_SEL_N field.

The equivalent configuration is also available on the Right channel; this can be selected

independently of the Left channel mode.

Figure 21 Single Ended Mode

DIFFERENTIAL LINE INPUT

The Differential Line PGA configuration is illustrated in Figure 22 for the Left channel. The available

gain in this mode is from -1.57dB to +28.5dB in non-linear steps. The input to the ADC is in phase

with the input pin selected by L_IP_SEL_P. The input to the ADC is phase inverted with respect to the

input pin selected by L_IP_SEL_N.

As an option, common mode noise rejection can be provided in this PGA configuration, as illustrated

in Figure 22. This is enabled using the register bits defined in Table 5.

The equivalent configuration is also available on the Right channel; this can be selected

independently of the Left channel mode.

Figure 22 Differential Line Mode

WM8904ECS/R Datasheet(PDF) 38 Page - Wolfson Microelectronics plc