WM8976GEFL/V Wolfson Microelectronics, WM8976GEFL/V Datasheet - Page 26

Audio CODECs Mono ADC Stereo DAC with Spkr

WM8976GEFL/V

Manufacturer Part Number
WM8976GEFL/V
Description
Audio CODECs Mono ADC Stereo DAC with Spkr
Manufacturer
Wolfson Microelectronics
Datasheet

Specifications of WM8976GEFL/V

Mounting Style
SMD/SMT
Package / Case
QFN-32
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
WM8976
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INPUT BOOST
Figure 15 Input Boost Stage
Table 7 Input BOOST Stage Control
The AUXL/R inputs can also be mixed into the output channel mixers, with a gain of -15dB to +6dB
plus off.
In addition the AUXR input can be summed into the Right speaker output path (ROUT2) with a gain
adjust of -15 to +6dB. This allows a ‘beep’ input to be output on the speaker outputs only without
affecting the headphone or lineout signals.
The input PGA stage is followed by an input BOOST circuit.
selectable inputs: the input microphone PGA output, the AUX amplifier output and the L2 input pin
(can be used as a line input, bypassing the input PGA). These three inputs can be mixed together
and have individual gain boost/adjust as shown in Figure 15.
The input PGA paths can have a +20dB boost (PGABOOSTL=1) , a 0dB pass through
(PGABOOSTL=0) or be completely isolated from the input boost circuit (INPPGAMUTEL=1).
The Auxiliary amplifier path to the BOOST stage is controlled by the AUXL2BOOSTVOL[2:0] register
bits. When AUXL2BOOSTVOL=000 this path is completely disconnected from the BOOST stage.
Settings 001 through to 111 control the gain in 3dB steps from -12dB to +6dB.
The L2 path to the BOOST stage is controlled by the LIP2BOOSTVOL[2:0] register bits. When
L2_2BOOSTVOL=000 the L2 input pin is completely disconnected from the BOOST stage. Settings
001 through to 111 control the gain in 3dB steps from -12dB to +6dB.
R47
Input BOOST
control
REGISTER
ADDRESS
8
BIT
PGABOOSTL
LABEL
1
DEFAULT
Boost enable for input PGA:
0 = PGA output has +0dB gain through
input BOOST stage.
1 = PGA output has +20dB gain
through input BOOST stage.
The input BOOST circuit has 3
DESCRIPTION
PD Rev 4.4 July 2009
Production Data
26

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