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WM8955LEFL датащи(PDF) 19 Page - Wolfson Microelectronics plc

номер детали WM8955LEFL
подробное описание детали  STEREO DAC FOR PORTABLE AUDIO APPLICATIONS
PDF  43 Pages
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производитель  WOLFSON [Wolfson Microelectronics plc]
домашняя страница  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8955LEFL датащи(HTML) 19 Page - Wolfson Microelectronics plc

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Product Preview
WM8955L
w
Product Preview Rev 0.4 May2003
19
LINE INPUTS AND OUTPUT MIXERS
The WM8955L provides the option to mix the DAC output signal with analogue line-in signals from
the LINEINL, LINEINR and MONOIN+ and MONOIN- pins. The level of the mixed-in signals can be
controlled with PGAs (Programmable Gain Amplifiers).
LINEINL, LINEINR, MONOIN+ and MONOIN- are high impedance, low capacitance AC coupled
analogue inputs. Theyare biased internallyto the reference voltage VREF. Whenever these inputs
are muted or the device placed into standbymode, the inputs remain biased to VREF using special
anti-thump circuitry. This reduces any audible clicks that may otherwise be heard when re-activating
the inputs.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
8
LD2LO
0
Left DAC to Left Mixer
0= Disable(Mute)
1 = Enable Path
7
LI2LO
0
LINEINL Signal to Left Mixer
0= Disable(Mute)
1 = Enable Path
R34 (22h)
Left Mixer (1)
6:4
LI2LOVOL
101
(-9dB)
LINEINL Signal to Left Mixer Volume
000 = +6dB
… (3dB steps)
111 = -15dB
8
RD2LO
0
Right DAC to Left Mixer
0= Disable(Mute)
1 = Enable Path
7
MI2LO
0
MONOIN Signal to Left Mixer
0= Disable(Mute)
1 = Enable Path
R35 (23h)
Left Mixer (2)
6:4
MI2LOVOL
101
(-9dB)
MONOIN Signal to Left Mixer Volume
000 = +6dB
… (3dB steps)
111 = -15dB
Table 6 Left Output Mixer Control



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