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WM8960GEFL/V データシート(PDF) 39 Page - Wolfson Microelectronics plc

部品番号 WM8960GEFL/V
部品情報  Stereo CODEC with 1W Stereo Class D Speaker Drivers and Headphone Drivers for Portable Audio Applications
PDF  88 Pages
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メーカー  WOLFSON [Wolfson Microelectronics plc]
ホームページ  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8960GEFL/V データシート(HTML) 39 Page - Wolfson Microelectronics plc

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Preliminary Technical Data
WM8960
w
PTD, September 2006, Rev 2.0
39
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
2:0
ACGAIN
[2:0]
000
(1.0x)
AC Speaker Boost (Boosts speaker AC
output signal by up to 1.8 x on left and
right channels)
000 = 1.00x boost (+0dB)
001 = 1.27x boost (+2.1dB)
010 = 1.40x boost (+2.9dB)
011 = 1.52x boost (+3.6dB)
100 = 1.67x boost (+4.5dB)
101 = 1.8x boost (+5.1dB)
110 to 111 = Reserved
Table 25 SPK_L/SPK_R Volume and Speaker Boost Control
To prevent pop noise, DCGAIN and ACGAIN should not be modified while the speaker outputs are
enabled.
To avoid clipping at speaker ground, ACGAIN should not be greater than DCGAIN.
To avoid clipping at speaker supply, SPKVDD1 and SPKVDD2 must be high enough to support the
peak output voltage when using DCGAIN and ACGAIN functions. The peak output voltage is
AVDD*(DCGAIN+ACGAIN)/2.
DCGAIN should normally be set to the same value as ACGAIN.
See "Volume Updates" for more information on volume update bits, zero cross and timeout
operation.
See "Class D Speaker Outputs" for more information on class D speaker operation.
OUT3 OUTPUT
The OUT3 pin can drive a 16
Ω or 32Ω headphone or a line output or be used as a pseudo-ground for
capless headphone drive (see Headphone Output section). It can also drive out a mono mix of left
and right output mixers (See Output Signal Path).



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