ak4561 AKM Semiconductor, Inc., ak4561 Datasheet - Page 42

• Manufacturer Part Number: ak4561
• Description: 16bit Codec With Built-in Alc And Mic/hp-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
3. Attention of IPGA writing operation
During the ALC operation, internal control register indicates the different value to the current IPGA value. And if the
writing value before and after the ALC operation is same, the IPGA value is not updated.
If the IPGA is the same value before and after the ALC operation, it needs to write the dummy command during the ALC
operation.
In Figure 30, the last IPGA value is reflected by doing the following sequence.
WR(IPGA=60H)
(1) WR(ALC = “1”): Enter ALC mode from Manual mode
(2) WR(ALC = “0”): Finish ALC mode and enter Manual mode
(3) WR(IPGA=60H): If the written value to control register is the same as the current value, the written value is ignored,
Rev. 0.9
Control Register
Internal IPGA Value
Internal State
WR(ALC= “1”)
The IPGA becomes a value after finishing ALC operation. (In Figure 30, the IPGA value assumes
40H.)
therefore the IPGA value keeps 40H (the value after finishing the ALC operation).
M anual M ode
Figure 30 . IPGA value during ALC operation 1
60H
WR(ALC= “0”)
AKM CONFIDENTIAL
(1)
- 42 -
WR(IPGA=60H)
60H --> 40H
ALC operation
60H
(2)
M anual M ode
(3)
40H
[AK4561]
2000/09