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WM8956CGEFL/V Datasheet(PDF) 19 Page - Wolfson Microelectronics plc

Part # WM8956CGEFL/V
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

WM8956CGEFL/V Datasheet(HTML) 19 Page - Wolfson Microelectronics plc

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Production Data
WM8956
w
PD, November 2011, Rev 4.1
19
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
R25 (19h)
Power
Management
(1)
5
AINL
0
Left channel input PGA and boost
stage enable
0 = PGA disabled, boost disabled
1 = PGA enabled (if LMIC = 1),
boost enabled
4
AINR
0
Right channel input PGA and boost
stage enable
0 = PGA disabled, boost disabled
1 = PGA enabled (if LMIC = 1),
boost enabled
R47 (2Fh)
Power
Management
(3)
5
LMIC
0
Left channel input PGA enable
0 = PGA disabled
1 = PGA enabled (if AINL = 1)
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
R32 (20h)
Left Input
Signal Path
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)
8
LMN1
1
Connect LINPUT1 to inverting input of Left
Input PGA
0 = LINPUT1 not connected to PGA
1 = LINPUT1 connected to PGA
R33 (21h)
Right Input
Signal Path
3
RMIC2B
0
Connect Right Input PGA to Right Input
Boost mixer
0 = Not connected
1 = Connected
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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