WM8978 Wolfson Microelectronics Ltd., WM8978 Datasheet - Page 94

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WM8978

Manufacturer Part Number
WM8978
Description
The WM8978 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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WM8978
w
46 (2Eh)
47 (2Fh)
48 (30h)
REGISTER
ADDRESS
5:0
8
7
6
5:0
8
7
6:4
3
2:0
8
7
BIT
INPPGAVOLL
INPPGAUPDATE
INPPGAZCR
INPPGAMUTER
INPPGAVOLR
PGABOOSTL
L2_2BOOSTVOL
AUXL2BOOSTVOL
PGABOOSTR
LABEL
010000
N/A
0
0
010000
1
0
000
0
000
1
0
DEFAULT
Left channel input PGA volume
000000 = -12dB
000001 = -11.25db
.
010000 = 0dB
.
111111 = 35.25dB
INPPGAVOLL and INPPGAVOLR volume do
not update until a 1 is written to
INPPGAUPDATE (in reg 45 or 46)
Right channel input PGA zero cross enable:
0=Update gain when gain register changes
1=Update gain on 1
register write.
Mute control for right channel input PGA:
0=Input PGA not muted, normal operation
1=Input PGA muted (and disconnected from the
following input BOOST stage).
Right channel input PGA volume
000000 = -12dB
000001 = -11.25db
.
010000 = 0dB
.
111111 = +35.25dB
Boost enable for left channel input PGA:
0 = PGA output has +0dB gain through input
BOOST stage.
1 = PGA output has +20dB gain through input
BOOST stage.
Reserved
Controls the L2 pin to the left channel input
boost stage:
000=Path disabled (disconnected)
001=-12dB gain through boost stage
010=-9dB gain through boost stage
111=+6dB gain through boost stage
Reserved
Controls the auxilliary amplifer to the left channel
input boost stage:
000=Path disabled (disconnected)
001=-12dB gain through boost stage
010=-9dB gain through boost stage
111=+6dB gain through boost stage
Boost enable for right channel input PGA:
0 = PGA output has +0dB gain through input
BOOST stage.
1 = PGA output has +20dB gain through input
BOOST stage.
Reserved
DESCRIPTION
st
zero cross after gain
PTD Rev 2.6 November 2005
Preliminary Technical Data
Input Signal
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Input Signal
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Input Signal
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REFER TO
94