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WM8903 Datasheet(PDF) 33 Page - Wolfson Microelectronics plc |
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WM8903 Datasheet(HTML) 33 Page - Wolfson Microelectronics plc |
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33 / 178 page  Production Data WM8903 w PD, Rev 4.5, June 2012 33 SINGLE-ENDED INPUT The Single-Ended PGA configuration is illustrated in Figure 23 for the Left channel. The available gain in this mode is from -1.55dB to +28.5dB in non-linear steps. The input impedance is 12k . 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. BYPASSL IN1L IN3L IN2L - + L_IP_SEL_N -1.55dB to +28.5dB, non-linear steps INL_ENA LIN_MUTE LIN_VOL ADC L VMID M U X Single-Ended (inverting) Mode (L_MODE = 00) Figure 23 Single Ended Mode DIFFERENTIAL LINE INPUT The Differential Line PGA configuration is illustrated in Figure 24 for the Left channel. The available gain in this mode is from -1.55dB to +28.5dB in non-linear steps. The input impedance is 12k . 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 24. 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. BYPASSL IN1L IN3L IN2L - + L_IP_SEL_N INL_ENA LIN_MUTE LIN_VOL ADC L M U X L_IP_SEL_P M U X Differential Line Mode (L_MODE = 01) -1.55dB to +28.5dB, non-linear steps INL_CM_ENA + - Figure 24 Differential Line Mode |
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