AK4691EG AKM [Asahi Kasei Microsystems], AK4691EG Datasheet - Page 58

• Manufacturer Part Number: AK4691EG
• Description: 4ch ADC + 2ch DAC with MIC/HP/SPK-AMP
• Manufacturer: AKM [Asahi Kasei Microsystems]

<ALC Operation Example of Speaker Playback>
<Speaker-Amp Control Sequence>
Speaker-Amp is powered-up/down by PMSPK bit. When PMSPK bit is “0”, both SPP and SPN pin are in Hi-Z state.
When PMSPK bit is “1” and SPPSN bit is “0”, the Speaker-Amp enters power-save mode. In this mode, the SPP pin is
placed in Hi-Z state and the SPN pin outputs SVDD/2 voltage. Power-save mode can reduce pop noise at power-up and
power-down.
■
When the MUTE pin is “H”, the output signals of LINEOUT, Headphone-Amp, and Speaker-Amp are muted, and
become VCOM or LVCM voltage. LINEOUT and Speaker-Amp become Power-save mode, HP-Amp is in mute state.
And switches of DACL, DACS, DACH, BEEPL, BEEPS, BEEPH, MICL1, MICR1, and MICL2 become “OFF” at the
same time.
MS0672-E-00
MUTE Function
PMSPK bit
PMSPK bit
0
1
SPPSN bit
SPP pin
SPN pin
Register Name
LMTH1-0
ZELMN
ZTM1-0
WTM2-0
REF7-0
IVL7-0,
IVR7-0
LMAT1-0
RGAIN1-0
ALC
SPPSN bit
Hi-Z
x
0
1
Figure 39. Power-up/Power-down Timing for Speaker-Amp
Table 54. ALC Operation Example of Speaker Playback
Table 55. Speaker-Amp Mode Setting (x: Don’t care)
SVDD/2
Comment
Limiter detection Level
Limiter zero crossing detection
Zero crossing timeout period
Recovery waiting period
*WTM2-0 bits should be the same or
Maximum gain at recovery operation
Gain of IVOL
Limiter ATT step
Recovery GAIN step
ALC enable
Hi-Z
larger data to ZTM1-0 bits
Normal Operation
Power-down
Power-save
Mode
- 58 -
Normal Operation
SPP pin
Hi-Z
Hi-Z
Data
C1H
91H
011
00
10
00
00
0
1
Normal Operation
fs=48kHz
SVDD/2
SPN pin
− 2.5dBFS
Operation
10.7ms
21.3ms
Hi-Z
Enable
+18dB
Enable
1 step
1 step
SVDD/2
0dB
Hi-Z
Hi-Z
(default)
[AK4691]
2007/11