WM8983GEFLSLASHV datasheet(30/124 Pages) WOLFSON

30 / 124 page

WM8983

Production Data

PD, Rev 4.3, May 2010

INPUT SIGNAL PATH

The WM8983 has a number of flexible analogue inputs. There are two input channels, Left and

Right, each of which consists of an input PGA stage followed by a boost/mix stage which drives into

the hi-fi ADC. Each input path has three input pins which can be configured in a variety of ways to

accommodate single-ended, differential or dual differential microphones. There are two auxiliary

input pins which can be fed into to the input boost/mix stage as well as driving into the output path. A

bypass path exists from the output of the boost/mix stage into the output left/right mixers.

MICROPHONE INPUTS

The WM8983 can accommodate a variety of microphone configurations including single ended and

pseudo differential inputs. The inputs to the left pseudo differential input PGA are LIP and L2. The

inputs to the right pseudo differential input PGA are RIP and R2. LIN and RIN are used for a.c.

coupled ground inputs.

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

and the non-inverting input of the input PGA clamped to VMID.

Figure 15 Microphone Input PGA Circuit

WM8983GEFL/V Datasheet(PDF) 30 Page - Wolfson Microelectronics plc