WM8953ECSSLASHRV datasheet(26/100 Pages) WOLFSON

26 / 100 page

WM8953

Production Data

PD, January 2009, Rev 4.0

INPUT SIGNAL PATH

The WM8953 has eight highly flexible analogue input channels, configurable in many combinations

of the following:

1. Up to four pseudo-differential or single-ended microphone inputs

2. Up to eight mono line inputs or 4 stereo line inputs

The input paths are mixed together as illustrated in Figure 14.

Figure 14 Control Registers for Input Signal Path

MICROPHONE INPUTS

Up to four microphones can be connected to the WM8953, either in single-ended or pseudo-

differential mode. A low noise microphone bias is fully integrated to reduce the need for external

components.

In single-ended microphone input configuration, the microphone signal is connected to the inverting

input of the PGA (LIN1, LIN3, RIN1 or RIN3). The non-inverting input of the PGAs should be

internally connected to VMID in this configuration. This is enabled via the Input PGA configuration

inputs.

In pseudo-differential microphone input configuration, the non-inverted microphone signal is

connected to the non-inverting input of the PGA (LIN2, LIN4, RIN2 or RIN4) and the inverted (or

noisy ground) signal is connected to the inverting input (LIN1, LIN3, RIN1 or RIN3).

Any PGA input pin that is used in either microphone configuration should not be enabled as a line

input path at the same time.

WM8953ECS/RV Datenblatt(PDF) 26 Page - Wolfson Microelectronics plc