AK4632VN AKM [Asahi Kasei Microsystems], AK4632VN Datasheet - Page 53

• Manufacturer Part Number: AK4632VN
• Description: 16-Bit ?? Mono CODEC with ALC & MIC/SPK/Video-AMP
• Manufacturer: AKM [Asahi Kasei Microsystems]

ASAHI KASEI
MS0396-E-00
Addr
Addr
0AH
09H
IPGA6-0: Input Analog PGA (See Table 42)
DVOL7-0: Output Digital Volume (See Table 43)
Register Name
Input PGA Control
Register Name
Digital Volume Control
IPGA6-0 bits should be set at 2/fs(250µs@fs=8kHz) after PMMIC bit is set to “1”. IPGA gain is reset when
PMMIC bit is “0”, and then IPGA operation starts from the default value when PMMIC bit is changed to “1”.
When ALC1 bit is changed from “1” to “0”, IPGA holds the last gain value set automatically by ALC1
operation.
period when IPGA value is changed. When the control register is written from the µP, the zero crossing
counter is reset and its counter starts. When the signal zero crossing or zero crossing timeout, the written value
from the µP becomes valid.
The AK4632 has a digital output volume (256 levels, 0.5dB step, Mute). The gain can be set by the DVOL7-0
bits. The volume is included in front of a DAC block, a input data of DAC is changed from +12 to –115dB
with MUTE. This volume has a soft transition function. It takes 1061/fs (=133ms @ fs = 8kHz) or 256/fs
(=32ms @ fs = 8kHz) from 00H to FFH. Soft Transition Time is set by DVTM bit.
Default: “10H” (0dB)
When IPGA gain is changed, IPGA6-0 bits should be written while PMMIC bit is “1” and ALC1 bit is “0”.
In a manual mode, IPGA can be set to any values in Table 42.The ZTM1-0 bits set zero crossing timeout
Default
Default
DATA (HEX)
DVOL7
D7
D7
47
46
45
36
10
06
05
04
03
02
01
00
0
0
0
:
:
:
Table 43. Digital Volume Code Table
Table 42. Input Gain Setting
DVOL7-0
DVOL6
IPGA6
FDH
FEH
FFH
00H
01H
02H
18H
D6
D6
•
•
0
0
GAIN (dB)
+27.5
+27.0
+26.5
+19.0
+0.0
−5.0
−5.5
−6.0
−6.5
−7.0
−7.5
−8.0
- 53 -
:
:
:
DVOL5
IPGA5
D5
D5
0
0
MUTE (−∞)
−114.5dB
−115.0dB
+12.0dB
+11.5dB
+11.0dB
Gain
0dB
•
•
DVOL4
IPGA4
D4
D4
1
1
0.5dB
STEP
DVOL3
IPGA3
Default
D3
D3
0
1
Default
DVOL2
IPGA2
D2
D2
0
0
DVOL1
IPGA1
D1
D1
0
0
[AK4632]
DVOL0
IPGA0
2005/06
D0
D0
0
0