WM8903 datasheet(30/178 Pages) WOLFSON

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WM8903

Production Data

PD, Rev 4.5, June 2012

ANALOGUE INPUT SIGNAL PATH

The WM8903 has six analogue input pins, which may be used to support connections to multiple

microphone or line input sources. The input multiplexer on the Left and Right channels can be used to

select different configurations for each of the input sources. The analogue input paths can support

line and microphone inputs, in single-ended and differential modes. The input stage can also provide

common mode noise rejection in some configurations.

The Left and Right analogue input channels are routed to the Analogue to Digital converters (ADCs).

There is also a bypass path for each channel, enabling the signal to be routed directly to the output

mixers.

The WM8903 input signal paths and control registers are illustrated in Figure 22.

Single-Ended (inverting) Mode: Gain -1.55dB to +28.5dB, non-linear steps

Differential Line Mode: Gain -1.55dB to +28.5dB, non-linear steps

Differential Microphone Mode: Gain +12dB to +30dB, 3dB steps

MUX

IN1L

IN3L

IN2L

L_MODE

L_IP_SEL_N

L_IP_SEL_P

INL_ENA

INL_CM_ENA

LIN_MUTE

LIN_VOL

VMID

BYPASSL

MUX

IN1R

IN3R

IN2R

R_MODE

R_IP_SEL_N

R_IP_SEL_P

INR_ENA

INR_CM_ENA

RIN_MUTE

RIN_VOL

VMID

BYPASSR

ADC L

ADC R

Single-Ended (inverting) Mode: Gain -1.55dB to +28.5dB, non-linear steps

Differential Line Mode: Gain -1.55dB to +28.5dB, non-linear steps

Differential Microphone Mode: Gain +12dB to +30dB, 3dB steps

Figure 22 Block Diagram for Input Signal Path

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