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WM8955L 数据表(PDF) 24 Page - Wolfson Microelectronics plc

部件名 WM8955L
功能描述  STEREO DAC FOR PORTABLE AUDIO APPLICATIONS
PDF  43 Pages
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制造商  WOLFSON [Wolfson Microelectronics plc]
网页  http://www.wolfsonmicro.com
标志 WOLFSON - Wolfson Microelectronics plc

WM8955L 数据表(HTML) 24 Page - Wolfson Microelectronics plc

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WM8955L
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Product Preview Rev 0.4 May2003
24
LOUT1/ROUT1 OUTPUTS
The LOUT1 and ROUT1 pins can drive a 16
Ω or 32Ω headphone or a line output (see Headphone
Output and Line Output sections, respectively). The signal volume on LOUT1 and ROUT1 can be
independentlyadjusted under software control bywriting to LOUT1VOL and ROUT1VOL,
respectively. Note that gains over 0dB may cause clipping if the signal is large. Any gain setting
below 0101111 (minimum gain) mutes the output driver. The corresponding output pin remains at the
same DC level (the reference voltage on the VREF pin), so that no click noise is produced when
muting or un-muting.
The analogue outputs have a zero cross detect feature to minimize audible clicks and zipper noise
when on gain changes (i.e. the updating of the gain value is delayed until the signal passes through
zero). Bydefault, this includes a time-out function, which forces the gain to update if no zero crossing
occurs within a certain period of time.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
6:0
LOUT1VOL
1111001
(0dB)
LOUT1 Volume
1111111 = +6dB
… (80 steps)
0110000 = -67dB
0101111 to 0000000 = Analogue MUTE
7
LO1ZC
0
LOUT1 zero cross enable
1 = Change gain on zero cross only
0 = Change gain immediately
R2 (02h)
LOUT1
Volume
8
LO1VU
0
Left Volume Update
0 = Store LOUT1VOL in intermediate
latch (no gain change)
1 = Update left and right channel gains
(left = LOUT1VOL, right =
intermediate latch)
6:0
ROUT1VOL
1111001
ROUT1 Volume
Similar to LOUT1VOL
7
RO1ZC
0
ROUT1 zero cross enable
Similar to LO1ZC
R3 (03h)
ROUT1
Volume
8
RO1VU
0
Right Volume Update
0 = Store ROUT1VOL in intermediate
latch (no gain change)
1 = Update left and right channel gains
(left = intermediate latch, right =
ROUT1VOL)
R23 (17h)
0
TOEN
1
Time-out enable for zero-cross detectors
0 = time-out disabled (i.e. gains are never
updated if there is no zero crossing)
1 = time-out enabled
Table 14 LOUT1/ROUT1 Volume Control



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