AK4950 Datasheet, PDF (98/106 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK/Cap-less VIDEO-AMP & mini DSP

[AK4950]
■ Speaker-Amp Output
SPKG1-0 bits
(Addr:03H, D21-20)
OVL7-0 bits
(Addr:22H)
ALC Control 1
(Addr:25H)
ALC Control 2
(Addr:26H)
ALC Control 3
(Addr:27H)
Digital Filter Path
(Addr:2CH)
ALC State
XX
01
(1)
XXH
XXH
XXH
(2)
(3)
(4)
91H
A1H
30H
XXH
59H
(5)
XXH
08H
(6)
ALC Disable
ALC Enable
PMPFIL bit
PMDAC bit
(Addr:00H, D23, D18)
PMSPK bit
(Addr:00H, D20)
SPPSN bit
DACS bit
(Addr:04H, D23, D17)
SPP pin
(7)
(8)
Hi-Z
(9)
Normal Output
ALC Disable
(10)
Hi-Z
SPN pin
Hi-Z
AVDD/2 Normal Output AVDD/2 Hi-Z
Example:
PLL Master Mode
Audio I/F Format: MSB justified
Sampling Frequency:48KHz
Digital Volume: 0dB
ALC: Enable, OREF : +6dB
Programmable Filter OFF
(1) Addr:03H, Data:10H
(2) Addr:22H, Data:91H
(3) Addr:25H, Data:A1H
(4) Addr:26H, Data:30H
(5) Addr:27H, Data:59H
(6) Addr:2CH, Data:08H
(7) Addr:00H, Data:94H
(8) Addr:04H, Data:82H
Playback
(9) Addr:04H, Data:00H
Figure 72. Speaker-Amp Output Sequence
(10) Addr:00H, Data:00H
<Example>
At first, clocks should be supplied according to “Clock Set Up” sequence.
(1) Set up SPK-Amp gain: SPKG1-0 bits = “00” → “01” (Addr = 03H)
(2) Set up OVOL value for output digital volume. (Addr = 22H)
This is the ALC stating OVOL value. When OVOLC bit = “1”, OVL7-0 bits (Addr= 22H) controls Lch and
Rch volumes. After the digital block is powered-up, the volume changes to the set value set from the default
value (0dB) in soft transition. When ALC bit is “0”, this volume can be used as a digital volume.
(3) Set up OREF value. (Addr = 25H)
(4) Set up RFST1-0 bits and WTM1-0 bits. (Addr= 26H)
(5) Set up LMTH-0 bits, RGAIN2-0 bits and ALC bit. (Addr=27H)
(6) Set up Programmable Filter Path: PESDO = ADCPF = PFDAC bits = “1” (Addr = 2CH)
(7) Power up DAC, Programmable Filter and Speaker-Amp: PMPFIL = PMSPK = PMDAC bits = “0” → “1”
(8) Exit power-save mode of Speaker-Amp: SPPSN bit = “1” → “0”
DAC → SPK-Amp Path setting: DACS bit = “0” → “1”
(9) Enter Speaker-Amp power save mode: SPPSN bit = “0” → “1”
Disables DAC → SPK-Amp path: DACS bit = “1” → “0”
(10) Power down DAC, MIN-Amp, Programmable Filter and Speaker-Amp.
PMPFIL = PMSPK = PMDAC bits = “1” → “0”
MS1320-E-00
- 98 -
2011/10