WM8956CGEFLSLASHV datasheet(17/80 Pages) WOLFSON

17 / 80 page

Production Data

WM8956

PD, November 2011, Rev 4.1

INPUT SIGNAL PATH

The WM8956 has three flexible stereo analogue input channels which can be configured as line

inputs, differential microphone inputs or single-ended microphone inputs. Line inputs and microphone

PGA outputs can be routed directly to the output mixers via a bypass path.

MICROPHONE INPUTS

Differential microphones can be connected between LINPUT1 and LINPUT2 or LINPUT3, and

between RINPUT1 and RINPUT2 or RINPUT3. Alternatively single-ended microphones can be

connected to LINPUT1 or RINPUT1.

In single-ended microphone input configuration the microphone signal should be input to LINPUT1 or

RINPUT1 and the internal non-inverting input of the input PGA should be switched to VMID.

In differential mode the larger signal should be input to LINPUT2 or LINPUT3 on the left channel, or

RINPUT2 or RINPUT3 on the right channel. The smaller (e.g. noisy ground connection) should be

input to LINPUT1 or RINPUT1.

The gain of the microphone PGAs is controlled directly via software.

The inputs LINPUT2, RINPUT2, LINPUT3 and RINPUT3 should not be connected to the boost mixer

or bypass path while operating as the non-inverting input in differential microphone configuration.

WM8956CGEFL/V Datasheet(PDF) 17 Page - Wolfson Microelectronics plc