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WM8956 Datasheet(PDF) 20 Page - Wolfson Microelectronics plc

Part # WM8956
Description  Hi-Fi DAC with 1W Stereo Class D Speaker Drivers and Headphone Drivers
PDF  80 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8956 Datasheet(HTML) 20 Page - Wolfson Microelectronics plc

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WM8956
Preliminary Technical Data
w
PTD, July 2007, Rev 2.1
20
The input PGAs and boost mixers are enabled by the AINL and AINR register bits. The microphone
PGAs can be also be disabled independently of the boost mixer to save power, using LMIC and
RMIC register bits.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
5
AINL
0
Left channel input PGA and boost
stage enable
0 = PGA disabled, boost disabled
1 = PGA enabled (if LMIC = 1),
boost enabled
R25 (19h)
Power
Management
(1)
4
AINR
0
Right channel input PGA and boost
stage enable
0 = PGA disabled, boost disabled
1 = PGA enabled (if LMIC = 1),
boost enabled
5
LMIC
0
Left channel input PGA enable
0 = PGA disabled
1 = PGA enabled (if AINL = 1)
R47 (2Fh)
Power
Management
(3)
4
RMIC
0
Right channel input PGA enable
0 = PGA disabled
1 = PGA enabled (if AINR = 1)
Table 2 Input PGA and Boost Enable Register Settings
The input PGAs can be configured as differential inputs, using LINPUT1/LINPUT2 or
LINPUT1/LINPUT3, and RINPUT1/RINPUT2 or RINPUT1/RINPUT3. The input impedance to these
non-inverting inputs is constant in this configuration. Differential configuration is controlled by LMP2,
LMP3, RMP2 and RMP3 as shown in Table 3.
When single-ended configuration is selected, the non-inverting input of the PGA is connected to
VMID.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
3
LMIC2B
0
Connect Left Input PGA to Left Input
Boost mixer
0 = Not connected
1 = Connected
6
LMP2
0
Connect LINPUT2 to non-inverting input of
Left Input PGA
0 = LINPUT2 not connected to PGA
1 = LINPUT2 connected to PGA (Constant
input impedance)
7
LMP3
0
Connect LINPUT3 to non-inverting input of
Left Input PGA
0 = LINPUT3 not connected to PGA
1 = LINPUT3 connected to PGA (Constant
input impedance)
R32 (20h)
Left Input
Signal Path
8
LMN1
1
Connect LINPUT1 to inverting input of Left
Input PGA
0 = LINPUT1 not connected to PGA
1 = LINPUT1 connected to PGA
3
RMIC2B
0
Connect Right Input PGA to Right Input
Boost mixer
0 = Not connected
1 = Connected
R33 (21h)
Right Input
Signal Path
6
RMP2
0
Connect RINPUT2 to non-inverting input
of Right Input PGA
0 = RINPUT2 not connected to PGA
1 = RINPUT2 connected to PGA
(Constant input impedance)



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