ak4620b AKM Semiconductor, Inc., ak4620b Datasheet - Page 33

• Manufacturer Part Number: ak4620b
• Description: 24-bit 192khz Audio Codec With Ipga
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
The AK4620B includes two channel-independent analog volumes (IPGA), each with 32 levels in 0.5dB increments.
These are located in front of the ADC while digital volume controls (IATT) with 128 levels (including MUTE) are
located after the ADC. Control of both of these volume settings is handled by the same register address (04H for L-ch,
05H for R-ch). When the MSB of the register is “1”, the IPGA changes and when the MSB= “0” the IATT changes. 80H
is the crossover point of the IPGA and DATT, and both IPGA/IATT are set to 0dB.
The IPGAs are set to “00H” when the PDN pin goes “L”. After returning to “H”, the IPGAs fade in the default value,
“80H” by 531(1/fs) cycles. The IPGAs are set to “00H” when PWAD goes “0”. After returning to “1”, the IPGAs fade in
the current value, but the ADC output is “0” during the first 516(1/fs) cycles. The IPAGs are set to “00H” when RSTAD
goes “0”. After returning to “1”, the IPGAs fade in to the current value, but the ADC outputs “0” during the first 516(1/fs)
cycles. IATTs can be controlled in differential mode.
ATT7-0: Attenuation Level
MS0401-E-00
Addr
Addr
04H
05H
06H
07H
FFH ~ A5H
IPGL/R7-0: ADC Input Gain Level
Data
A4H
A3H
7FH
7EH
82H
81H
80H
02H
01H
00H
Register Name
Lch IPGA Control
Rch IPGA Control
Register Name
Lch OATT Control
Rch OATT Control
:
:
ATT = 20 log
FFH : 0dB (Default)
00H : Mute
DEFAULT
DEFAULT
Refer to Table 10
Default: 80H (0dB)
Volume (dB)
Analog
+17.5
+1.0
+0.5
+18
+18
10
0
0
0
0
0
0
:
:
(ATT_DATA / 255) [dB]
ATT (dB)
IPGR7
IPGL7
ATTR7
ATTL7
MUTE
Digital
D7
-63.0
-63.5
D7
-0.5
-1.0
1
1
0
0
0
0
0
0
:
:
Table 10. IPGA code table
ATTL6
ATTR6 ATTR5
IPGR6
IPGL6
D6
D6
0
1
Total Gain (dB)
MUTE
- 33 -
+17.5
-63.0
-63.5
+1.0
+0.5
ATTL5
+18
+18
-0.5
-1.0
IPGR5
IPGL5
0
:
:
D5
D5
1
0
ATTR4
ATTL4
IPGR4
IPGL4
D4
D4
1
0
Step width
(dB)
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
-
-
:
:
ATTR3
ATTL3
IPGR3
IPGL3
D3
D3
1
0
Soft-changes between each level.
Digital volume with 0.5dB/step.
Analog volume with 0.5dB/step
ATTL2
ATTR2
IPGR2
IPGL2
D2
D2
1
0
ATTL1
ATTR1
IPGR1
IPGL1
IPGA
IATT
D1
D1
1
0
[AK4620B]
ATTR0
ATTL0
IPGR0
2005/07
IPGL0
D0
D0
1
0