AK4955 Datasheet, PDF (93/117 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK/Cap-less VIDEO-AMP/ LDO & DSP

[AK4955]
Addr
1CH
Register Name
Digital Filter Select 1
R/W
Default
D7
D6
D5
D4
D3
D2
D1
D0
0
0
LPF
HPF
EQ0
GN1
GN0
FIL3
R
R
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
1
FIL3: Stereo Emphasis Filter Control
0: OFF
1: ON (default)
When FIL3 bit = “1”, settings of F3A13-0 and F3B13-0 bits are enabled.
GN1-0: Gain Block Gain Setting (Table 26)
Default: “00” (0dB)
EQ0: Gain Correction Filter (EQ0) Control
0: OFF (default)
1: ON
When EQ0 bit = “1”, settings of E0A15-0, E0B13-0 and E0C15-0 bits are enabled. When EQ0 bit = “0”, the
audio data passes this block by 0dB gain.
HPF: HPF3 Coefficient Setting Enable
0: OFF (default)
1: ON
When HPF bit is “1”, settings of F1A13-0 and F1B13-0 bits are enabled. When HPF bit is “0”, the audio data
passes this block by 0dB gain.
LPF: LPF Coefficient Setting Enable
0: OFF (default)
1: ON
When LPF bit is “1”, settings of F2A13-0 and F2B13-0 bits are enabled. When LPF bit is “0”, the audio data
passes this block by 0dB gain.
Addr
1DH
Register Name
Digital Filter Control
R/W
Default
D7
D6
D5
0
0
0
R
R
R
0
0
0
PFSDO: SDTO Output Signal Select
0: ADC (+ 1st HPF) Output
1: Programmable Filter / ALC Output (default)
ADCPF: Programmable Filter / ALC Input Signal Select
0: SDTI
1: ADC Output (default)
PFDAC: DAC Input Signal Select
0: SDTI (default)
1: Programmable Filter / ALC Output
DSPBP: DSP Bypass Mode Enable
0: Disable (default)
1: Enable DSP block is bypassed.
D4
D3
D2
D1
D0
0
DSPBP PFDAC ADCPF PFSDO
R
R/W
R/W
R/W
R/W
0
0
0
1
1
MS1343-E-00
- 93 -
2011/12