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WM8955L 数据表(PDF) 25 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) 25 Page - Wolfson Microelectronics plc

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WM8955L
w
Product Preview Rev 0.4 May2003
25
LOUT2/ROUT2 OUTPUTS
The LOUT2 and ROUT2 output pins are essentiallysimilar to LOUT1 and ROUT1, but theyare
independentlycontrolled and can also drive an 8
Ω mono speaker. For speaker drive, the ROUT2
signal must be inverted (ROUT2INV = 1), so that the left and right channel are mixed to mono in the
speaker [L–(-R) = L+R].
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
6:0
LOUT2VOL
1111001
(0dB)
similar to LOUT1VOL
7
LO2ZC
0
Left zero cross enable
1 = Change gain on zero cross only
0 = Change gain immediately
R40 (28h)
LOUT2
Volume
8
LO2VU
0
similar to LO1VU
6:0
ROUT2VOL
1111001
(0dB)
similar to ROUT1VOL
7
RO2ZC
0
Left zero cross enable
1 = Change gain on zero cross only
0 = Change gain immediately
R41 (29h)
ROUT2
Volume
8
RO2VU
0
similar to RO1VU
R23 (17h)
0
TOEN
1
as for LOUT1 / ROUT1
R24 (18h)
Additional (2)
3
ROUT2INV
0
ROUT2 Invert
0= No Inversion(0
° phase shift)
1 = Signal inverted (180
° phase shift)
Table 15 LOUT2/ROUT2 Control
MONO OUTPUT
The MONOOUT pin can drive a mono line output. The signal volume on MONOOUT can be adjusted
under software control bywriting to MONOOUTVOL.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
6:0
MONOOUT
VOL
1111001
(0dB)
MONOOUT Volume
1111111 = +6dB
… (80 steps)
0110000 = -67dB
0101111 to 0000000 = Analogue MUTE
R42 (2Ah)
MONOOUT
Volume
7
MOZC
0
MONOOUT zero cross enable
1 = Change gain on zero cross only
0 = Change gain immediately
R23 (17h)
0
TOEN
1
as for LOUT1 / ROUT1
Table 16 MONOOUT Volume Control
OUT3 OUTPUT
TheOUT3 pin candrive a 16
Ω or 32Ω headphone or a line output or be used as a DC reference for a
headphone output. It can be selected to either drive out an inverted ROUT1 or inverted MONOOUT
for e.g. an earpiece drive between OUT3 and LOUT1 or differential output between OUT3 and
MONOOUT.
OUT3SW selects the mode of operation required.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R24 (18h)
Additional (2)
8:7
OUT3SW
00
OUT3 select
00 : VREF
01 : ROUT1
10 : MONOOUT
11 : right mixer output
Table 17 OUT3 select



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