ak4569 AKM Semiconductor, Inc., ak4569 Datasheet - Page 32

• Manufacturer Part Number: ak4569
• Description: 20-bit Stereo Codec With Ipga & Hp-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
MS0292-E-01
Addr
05H
Addr
04H
REF6-0: Reference Value at ALC Recovery Operation, 0.5dB step, 103 levels, Default: “3FH” (Table 12)
IPGA6-0: Input Analog PGA, 0.5dB step, 103 levels, Default: “3FH” (Table 13)
Register Name
IPGA Control
Register Name
ALC Mode Control 2
Default
Default
During the ALC recovery operation, if the IPGA value exceeds the set reference value by gain operation,
IPGA does not become larger than the reference value. For example, when REF= “40H”, RATT= “1” (2
step) and IPGA= “3FH”, then IPGA is going to become 3FH + 2step = 41H, but IPGA becomes 40H in
fact, since REF=40H.
When IPGA gain is changed, IPGA6-0 bits should be written while PMADC bit is “1” and ALC bit is “0”.
IPGA gain is reset when PMADC bit is “0”, and then IPGA operation starts from the default value when
PMADC is changed to “1”. When ALC bit is changed from “1” to “0”, IPGA holds the last gain value set
by ALC operation.
Table 12. Reference Value Setting at ALC Recovery Operation
DATA
DATA
67H
66H
65H
3FH
27H
02H
01H
00H
67H
66H
65H
3FH
27H
02H
01H
00H
:
:
:
:
:
:
D7
D7
0
0
0
0
AINL1, AINR1
AINL1, AINR1
MUTE (−∞)
MUTE (−∞)
(LINE IN)
(LINE IN)
Table 13. Input Gain Setting
+20.0dB
+19.5dB
+19.0dB
+20.0dB
+19.5dB
+19.0dB
−12.0dB
−30.5dB
−31.0dB
−12.0dB
−30.5dB
−31.0dB
IPGA6
0dB
0dB
REF6
D6
:
:
:
D6
:
:
:
0
0
GAIN
GAIN
IPGA5
- 32 -
REF5
D5
D5
1
1
AINL2, AINR2
AINL2, AINR2
MUTE (−∞)
MUTE (−∞)
(MIC IN)
(MIC IN)
+32.0dB
+31.5dB
+31.0dB
+12.0dB
−18.5dB
−19.0dB
+32.0dB
+31.5dB
+31.0dB
+12.0dB
−18.5dB
−19.0dB
0dB
0dB
:
:
:
IPGA4
:
:
:
REF4
D4
D4
1
1
IPGA3
REF3
Default
Default
D3
D3
1
1
IPGA2
REF2
D2
D2
1
1
IPGA1
REF1
D1
D1
1
1
[AK4569]
IPGA0
2005/07
REF0
D0
D0
1
1