WM8976 Wolfson Microelectronics Ltd., WM8976 Datasheet - Page 21

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WM8976

Manufacturer Part Number
WM8976
Description
The WM8976 is a low power, high quality stereo codec designed for portable applications such as Digital still camera or Digital Camcorde
Manufacturer
Wolfson Microelectronics Ltd.
Datasheet

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Pre-Production
INPUT SIGNAL PATH
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MICROPHONE INPUTS
The WM8976 can accommodate a variety of microphone configurations including single ended and
differential inputs. The inputs to the differential input PGA are LIN, LIP and L2.
In single-ended microphone input configuration the microphone signal should be input to LIN and the
internal NOR gate configured to clamp the non-inverting input of the input PGA to VMID.
In differential mode the larger signal should be input to LIP or RIP and the smaller (e.g. noisy ground
connections) should be input to LIN or RIN.
Figure 7 Microphone Input PGA Circuit
The input PGA is enabled by the IPPGAENL/R register bits.
Table 3 Input PGA Enable Register Settings
The WM8976 has flexible analogue inputs. An input PGA stage is followed by a boost/mix stage
which drives into the hi-fi ADC. The input path has three input pins which can be configured in a
variety of ways to accommodate single-ended or differential microphones. There is an auxiliary input
pin 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.
R2
Power
Management
2
REGISTER
ADDRESS
2
BIT
INPPGAENL
LABEL
0
DEFAULT
Input PGA enable
0 = disabled
1 = enabled
DESCRIPTION
PP Rev 3.0 April 2006
WM8976
21

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