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WM8737L датащи(PDF) 18 Page - Wolfson Microelectronics plc

номер детали WM8737L
подробное описание детали  STEREO ADC WITH MICROPHONE PREAMPLIFIER
PDF  38 Pages
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производитель  WOLFSON [Wolfson Microelectronics plc]
домашняя страница  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8737L датащи(HTML) 18 Page - Wolfson Microelectronics plc

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WM8737L
Preliminary Technical Data
w
AI Rev 3.0 May 2004
18
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
7:0
LINVOL[7:0]
C3h
( 0dB )
Left Channel Input Volume Control
00000000: MUTE
00000001: -97dB
00000010: -96.5dB
…
11000011: 0dB
…
11111111: +30dB
R0 (00h)
Left Channel
PGA
8
LVU
0
Left PGA volume update
0: Store LINVOL in left intermediate
latch but do not update left gain.
1: Update both PGA gains
simultaneously (left gain = LINVOL,
right gain = right intermediate latch).
7:0
RINVOL[7:0]
C3h
( 0dB )
Right Channel Input Volume Control.
Same as LINVOL.
R1 (01h)
Right Channel
PGA
8
RVU
0
Right PGA volume update
0: Store RINVOL in right
intermediate latch but do not update
right gain.
1: Update both PGA gains
simultaneously (right gain =
RINVOL, left gain = left intermediate
latch).
Table 7 PGA Software Control
ZERO-CROSS DETECTION
To avoid zipper or click noises, it is preferable to change the microphone preamplifier and PGA gains
only when the input signal is at zero. The WM8737L has built-in zero-cross detectors to achieve this.
This function is enabled by setting the LMZC, LPZC, RMZC and RPZC bits. The zero-cross detection
feature includes a programmable time-out, selected by writing to LZCTO[1:0] and RZCTO[1:0]. If no
zero crossing occurs within the time-out period then the WM8737L changes the PGA or microphone
preamplifier gains when the time-out elapses.



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