WM8978 Wolfson Microelectronics Ltd., WM8978 Datasheet - Page 93

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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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Preliminary Technical Data
w
44 (2Ch)
45 (2Dh)
REGISTER
ADDRESS
3:1
0
8
7
6
5
4
3
2
1
0
8
7
6
BIT
BEEPVOL
BEEPEN
MBVSEL
R2_2INPPGA
RIN2INPPGA
RIP2INPPGA
L2_2INPPGA
LIN2INPPGA
LIP2INPPGA
INPPGAUPDATE
INPPGAZCL
INPPGAMUTEL
LABEL
000
0
0
0
0
1
1
0
0
1
1
N/A
0
0
DEFAULT
AUXR input to ROUT2 inverter gain
000 = -15dB
...
111 = +6dB
0 = mute AUXR beep input
1 = enable AUXR beep input
Microphone Bias Voltage Control
0 = 0.9 * AVDD
1 = 0.65 * AVDD
Reserved
Connect R2 pin to right channel input PGA
positive terminal.
0=R2 not connected to input PGA
1=R2 connected to input PGA amplifier positive
terminal (constant input impedance).
Connect RIN pin to right channel input PGA
negative terminal.
0=RIN not connected to input PGA
1=RIN connected to right channel input PGA
amplifier negative terminal.
Connect RIP pin to right channel input PGA
amplifier positive terminal.
0 = RIP not connected to input PGA
1 = right channel input PGA amplifier positive
terminal connected to RIP (constant input
impedance)
Reserved
Connect L2 pin to left channel input PGA
positive terminal.
0=L2 not connected to input PGA
1=L2 connected to input PGA amplifier positive
terminal (constant input impedance).
Connect LIN pin to left channel input PGA
negative terminal.
0=LIN not connected to input PGA
1=LIN connected to input PGA amplifier
negative terminal.
Connect LIP pin to left channel input PGA
amplifier positive terminal.
0 = LIP not connected to input PGA
1 = input PGA amplifier positive terminal
connected to LIP (constant input impedance)
INPPGAVOLL and INPPGAVOLR volume do
not update until a 1 is written to
INPPGAUPDATE (in reg 45 or 46)
Left channel input PGA zero cross enable:
0=Update gain when gain register changes
1=Update gain on 1
register write.
Mute control for left channel input PGA:
0=Input PGA not muted, normal operation
1=Input PGA muted (and disconnected from the
following input BOOST stage).
DESCRIPTION
st
zero cross after gain
PTD Rev 2.6 November 2005
Analogue
Outputs
Analogue
Outputs
Input Signal
Path
Input Signal
Path
Input Signal
Path
Input Signal
Path
Input Signal
Path
Input Signal
Path
Input Signal
Path
Input Signal
Path
Input Signal
Path
Input Signal
Path
REFER TO
WM8978
93