wm8918 Wolfson Microelectronics plc, wm8918 Datasheet - Page 140

• Manufacturer Part Number: wm8918
• Description: Ultra Low Power Dac For Portable Audio Applications
• Manufacturer: Wolfson Microelectronics plc

WM8918
Register 21h DAC Digital 1
Register 24h DMIC Digital Volume Left
w
DMIC Digital
Volume Left
DAC Digital
REGISTER
REGISTER
ADDRESS
ADDRESS
R33 (21h)
R36 (24h)
1
BIT
BIT
2:1
7:0
12
11
10
9
6
3
8
DAC_MUTERA
DAC_UNMUTE
DMICL_VOL[7:
DAC_SB_FILT
DAC_OSR128
DEEMPH[1:0]
DAC_MONO
DAC_MUTE
DMIC_VU
_RAMP
LABEL
LABEL
TE
0]
1100_0000 Left Digital Microphone Volume
DEFAULT
DEFAULT
00
0
0
0
0
0
1
0
DAC Mono Mix
0 = Stereo
1 = Mono (Mono mix output on enabled DAC)
Selects DAC filter characteristics
0 = Normal mode
1 = Sloping stopband mode
(recommended when fs<=24kHz)
DAC Soft Mute Ramp Rate
0 = Fast ramp (fs/2, maximum ramp time is 10.7ms at
fs=48k)
1 = Slow ramp (fs/32, maximum ramp time is 171ms at
fs=48k)
DAC Soft Mute Mode
0 = Disabling soft-mute (DAC_MUTE=0) will cause the
DAC volume to change immediately to DACL_VOL and
DACR_VOL settings
1 = Disabling soft-mute (DAC_MUTE=0) will cause the
DAC volume to ramp up gradually to the DACL_VOL
and DACR_VOL settings
DAC Oversample Rate Select
0 = Low power (normal OSR)
1 = High performance (double OSR)
DAC Soft Mute Control
0 = DAC Un-mute
1 = DAC Mute
DAC De-Emphasis Control
00 = No de-emphasis
01 = 32kHz sample rate
10 = 44.1kHz sample rate
11 = 48kHz sample rate
Digital Microphone Volume Update
Writing a 1 to this bit will cause left and right DMIC
volume to be updated simultaneously
00h = Mute
01h = -71.625dB
02h = -71.250dB
… (0.375dB steps)
C0h = 0dB
… (0.375dB steps)
EFh to FFh = +17.625dB
DESCRIPTION
DESCRIPTION
PD, Rev 4.0, September 2010
REFER TO
REFER TO
Production Data
140